SEC Filing | Origin Materials, Inc.

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425

Filing pursuant to Rule 425 under the

Securities Act of 1933, as amended

Deemed filed under Rule 14a-12 under the

Securities Exchange Act of 1934, as amended

Filer: Artius Acquisition Inc.

Subject Company: Artius Acquisition Inc.

Filer’s Commission File Number: 1-39378

Date: April 19, 2021

Analyst Day Investor Presentation The world’s leading carbon negative materials company April 19, 2021

Forward Looking Statements and Disclaimers DISCLAIMER This presentation is for informational purposes only. It shall not constitute an offer to sell, or the solicitation of an offer to buy, any securities, nor shall there be any sale of securities in any states or jurisdictions in which such offer, solicitation or sale would be unlawful. This presentation has been prepared to assist interested parties in making their own evaluation with respect to a potential business combination between Artius Acquisition, Inc. (“Artius”), Micromidas, Inc. (dba Origin Materials, “Origin”) and related transactions (the “Proposed Business Combination”) and for no other purpose. Neither the Securities and Exchange Commission (“SEC”) nor any securities commission of any other U.S. or non-U.S. jurisdiction has approved or disapproved of the Proposed Business Combination, or determined that this presentation is truthful or complete. Any representation to the contrary is a criminal offense. No representations or warranties, express or implied, are given in, or in respect of, this presentation. To the fullest extent permitted by law, in no circumstances will Artius, Origin or any of their respective subsidiaries, stockholders, affiliates, representatives, directors, officers, employees, advisers, or agents be responsible or liable for a direct, indirect, or consequential loss or loss of profit arising from the use of this presentation, its contents, its omissions, reliance on the information contained within it, or on opinions communicated in relation thereto or otherwise arising in connection therewith. Industry and market data used in this presentation have been obtained from third-party industry publications and sources as well as from research reports prepared for other purposes. Neither Artius nor Origin has independently verified the data obtained from these sources and cannot assure you of the data’s accuracy or completeness. This data is subject to change. In addition, this presentation does not purport to be all-inclusive or to contain all of the information that may be required to make a full analysis of Origin or the Proposed Business Combination. Viewers of this presentation should each make their own evaluation of Origin and of the relevance and adequacy of the information and should make such other investigations as they deem necessary. The information contained herein is as of April 19, 2021, and does not reflect any subsequent events. FORWARD-LOOKING STATEMENTS Certain statements included in this presentation that are not historical facts are forward-looking statements for purposes of the safe harbor provisions under the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements generally are accompanied by words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “should,” “would,” “plan,” “predict,” “potential,” “seem,” “seek,” “future,” “outlook,” and similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding Origin’s business strategy, estimated total addressable market, commercial and operating plans, product development plans and projected financial information. These statements are based on various assumptions, whether or not identified in this presentation, and on the current expectations of the respective management of Origin and Artius and are not predictions of actual performance. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on as, a guarantee, an assurance, a prediction, or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond the control of Origin and Artius. These forward-looking statements are subject to a number of risks and uncertainties, including that Origin may be unable to successfully commercialize its products; the effects of competition on Origin’s business; the uncertainty of the projected financial information with respect to Origin; disruptions and other impacts to Origin’s business as a result of the COVID-19 pandemic and other global health or economic crises; changes in customer demand; the parties may be unable to successfully or timely consummate the Proposed Business Combination, including the risk that any regulatory approvals are not obtained, are delayed or are subject to unanticipated conditions that could adversely affect the combined company or the expected benefits of the Proposed Business Combination or that the approval of the stockholders of Artius or Origin is not obtained; failure to realize the anticipated benefits of the Proposed Business Combination; the amount of redemption requests made by Artius’ stockholders, and those factors discussed in the registration statement on Form S-4 filed by Artius with the SEC on March 9, 2021 (the “Registration Statement”) under the heading “Risk Factors,” and other documents Artius has filed, or will file, with the SEC. If any of these risks materialize or our assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. There may be additional risks that neither Artius nor Origin presently know, or that Artius or Origin currently believe are immaterial, that could also cause actual results to differ from those contained in the forward-looking statements. In addition, forward-looking statements reflect Artius’ and Origin’s expectations, plans, or forecasts of future events and views as of the date of this presentation. Artius and Origin anticipate that subsequent events and developments will cause Artius’ and Origin’s assessments to change. However, while Artius and Origin may elect to update these forward-looking statements at some point in the future, Artius and Origin specifically disclaim any obligation to do so. These forward-looking statements should not be relied upon as representing Artius’ and Origin’s assessments of any date subsequent to the date of this presentation. Accordingly, undue reliance should not be placed upon the forward-looking statements. ADDITIONAL INFORMATION AND WHERE TO FIND IT This presentation relates to a proposed transaction between Origin and Artius. This presentation does not constitute an offer to sell or exchange, or the solicitation of an offer to buy or exchange, any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, sale or exchange would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Artius has filed the Registration Statement, which includes a preliminary proxy statement to be distributed to holders of Artius’s ordinary shares in connection with Artius’s solicitation of proxies for the vote by Artius’s stockholders with respect to the proposed transaction and other matters as described in the Registration Statement, as well as the prospectus relating to the offer of securities to be issued to Artius’s and Origin’s stockholders in connection with the proposed transaction. After the Registration Statement has been declared effective, Artius will mail a definitive proxy statement, when available, to its stockholders. Investors and security holders and other interested parties are urged to read the proxy statement/prospectus, any amendments thereto and any other documents filed with the SEC carefully and in their entirety when they become available because they will contain important information about Artius, Origin and the proposed transaction. The documents relating to the proposed transaction (when they are available) can be obtained free of charge from the SEC’s website at www.sec.gov. Free copies of these documents, once available, may also be obtained from Artius by directing a request to: Artius Management LLC, 3 Columbus Circle, Suite 2215 New York, New York 10019. PARTICIPANTS IN SOLICITATION Artius, Origin and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from Artius’ shareholders in connection with the proposed transaction. Information about Artius’s directors and executive officers and their ownership of Artius’s securities is set forth in the Registration Statement described above. Additional information regarding the interests of those persons and other persons who may be deemed participants in the proposed transaction may be obtained by reading other documents Artius has filed, or will file, with the SEC regarding the Proposed Business Combination, including the definitive proxy statement when it becomes available. You may obtain free copies of these documents as described in the preceding paragraph. NON-SOLICITATION This presentation is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the potential transaction and shall not constitute an offer to sell or a solicitation of an offer to buy the securities of Artius, the combined company or Origin, nor shall there be any sale of any such securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act of 1933, as amended. USE OF PROJECTIONS This presentation contains Origin’s projected financial information. Such projected financial information is forward-looking and is for illustrative purposes only. It should not be relied upon as being indicative of future results. The assumptions and estimates underlying such projected financial information are inherently uncertain and are subject to many significant business, economic, competitive and other risks and uncertainties. Refer to “Forward-Looking Statements” above. Actual results may differ materially from the results presented in such projected financial information, and the inclusion of such information in this presentation should not be regarded as a representation by any person that the results reflected in such projections will be achieved. FINANCIAL INFORMATION; NON-GAAP FINANCIAL MEASURES The financial information and data contained in this presentation are unaudited and do not conform to Regulation S-X. Accordingly, such information and data may not be included, may be adjusted or may be presented differently in any proxy statement, prospectus or registration statement or other report or document to be filed or furnished by Artius with the SEC. In addition to financial measures included in this presentation that are calculated in accordance with generally accepted accounting principles in the United States (“GAAP”), this presentation contains non-GAAP financial measures, such as EBITDA and EBITDA margins. Artius and Origin believe these non- GAAP financial measures provide useful information to management and investors regarding certain financial and business trends relating to Origin’s financial condition and results of operations. Origin’s management uses these non-GAAP financial measures in conjunction with traditional GAAP financial and operating performance measures as part of its overall assessment of its performance, for budgeting and planning purposes, to evaluate the effectiveness of its business strategies and to communicate with investors. Origin does not place undue reliance on these non-GAAP financial measures, and they should not be considered as substitutes for other measures of financial condition and results of operations reported in accordance with GAAP. A reconciliation of EBITDA to net income (loss) is not included in this presentation because the items that impact net income (loss) are outside of Origin’s control and cannot be reasonably predicted. Accordingly, reconciliation of adjusted EBITDA to net income (loss) is not available without unreasonable effort. You should review Origin’s audited financial statements prepared in accordance with GAAP, which will be included in a combined registration statement and proxy statement to be filed with the SEC. TRADEMARKS This presentation contains trademarks, service marks, trade names and copyrights of Artius, Origin and other companies which are the property of their respective owners. 2

Risk Factors Summary Investing in this transaction involves a high degree of risk. Below is a summary of certain factors that make an investment in this transaction speculative or risky. This summary is not comprehensive. Additional discussion of the risks and uncertainties summarized in this risk factor summary, and other risks and uncertainties relevant to this transaction, are included under the heading “Risk Factors” contained in the proxy statement/prospectus related to this transaction. Origin is an early stage company with a history of losses and its future profitability is uncertain. Origin may be delayed in or unable to procure necessary capital equipment. Origin has not produced its products in large commercial quantities. Any decline in the value of carbon credits associated with Origin's products could harm Origin's results of operations, cash flow and financial condition. Origin expects to rely on a limited number of customers for a significant portion of its near-term revenue. Origin's offtake agreements with customers include termination, liquidated damages and/or advance repayment provisions that may be triggered if Origin fails to timely complete plant construction or commence its commercial operations. Origin's products may not achieve market success. Origin is subject to U.S. and foreign anti-corruption and anti-money laundering laws and regulations. Origin could face criminal liability and other serious consequences for violations, which would harm Origin's business. Origin's operating plan may require Origin to source feedstock and supplies internationally, and foreign currency exchange rate fluctuations and changes to international trade agreements, tariffs, import and excise duties, taxes or other governmental rules and regulations could adversely affect Origin's business, financial condition, results of operations and prospects. Origin's business relies on proprietary information and other intellectual property, and Origin's failure to protect its intellectual property rights could harm its competitive advantages with respect to the use, manufacturing, sale or other commercialization of Origin's processes, technologies and products, which may have an adverse effect on Origin's results of operations and financial condition. Origin may face patent infringement and other intellectual property claims that could be costly to defend, result in injunctions and significant damage awards or other costs (including indemnification of third parties or costly licensing arrangements, if licenses are available at all) and limit Origin's ability to use certain key technologies in the future or require development of non-infringing products or technologies, which may cause Origin to incur significant unexpected costs, prevent Origin from commercializing its products and otherwise harm its business. Origin relies on trade secrets to protect its technology, and Origin's failure to maintain trade secret protection could limit its ability to compete. Origin's management has limited experience in operating a public company. 3

Visionary leadership team with long history of creating shareholder value John Bissell Rich Riley Nate Whaley Charles Drucker Boon Sim Founder & Co-CEO Co-CEO CFO Executive Chairman CEO & CFO • Founded Origin Materials in 2008• Former CEO Shazam and senior • 20 years C-Suite experience scaling • Former Chairman & CEO at • Managing Partner of Artius • Featured on Forbes 30 under 30 executive at Yahoo! complex high growth business Vantiv/WorldPay; global Capital Partners • B.S. Chemical Engineering, UC • 20+ years managing rapid-growth across industries executive with extensive Fortune • 30+ years of investment and Davis organizations• B.S. Civil & Environmental 500 network financial services experience; • Featured on Forbes 40 under 40 Engineering; MBA, • Over 30 years as highly successful formerly President, Head of and Billboard’s Power 100 UC Davis technology/fin-tech operator; Americas and International • Investor in Origin since 2010 created over $40bn of value for Groups of Temasek and Head of • B.S. Economics, Wharton School, Vantiv/WorldPay over a 10-year Global M&A of Credit Suisse/First UPenn period as CEO Boston • Board member of Canadian Pension Plan Investment Board (“CPPIB”) 4

O O H Cl Origin Materials – At a Glance The world’s leading carbon negative materials company Disruptive Materials Decarbonizing Platform Enormous TAM Cost advantaged Technology Company Technology ~$1+ Trillion C $390Bn near-term focus in Timber feedstocks are Origin produces low and Enables customers’ net- polyesters; $750Bn across competitive with oil and ~10x negative carbon materials zero commitments broad range of materials cheaper than bio alternatives Protected & Validated Global Fortune 500 Massive Customer Funded to 2 3 Technology Customers & Investors Demand Commercial Scale and 11% Owned $2.4Bn growing 19 Patent Families $863Mn by customers who are also Origin expected to be fully 1 investors Core technology protected in key financed until EBITDA positive with from a diverse mix of industries countries anticipated financing and grants 1. Represents combined ownership by PepsiCo, Danone and Nestle prior to this transaction. 2. Includes $779Mn in offtake agreements, $1.096Bn in capacity reservation agreements, and $547Mn in negotiations with potential customers, with $264Mn specified as customer options. Figures assume maximum offtake amounts and exercise of full customer options. Refer to slide 21 for additional detail. 5 3. Refer to slides 37 and 48 for additional detail. Assumes no Artius share redemption. Source: Origin Materials.

Leading institutions are committing to a net zero future The global industrial complex is committed to decarbonization 2030 2030-2040 2040 - 2050 Patagonia AT&T Michelin Carbon neutral by 2025 Net zero by 2035 Net zero by 2050 Walmart Proctor & Gamble BP Net zero by 2040 Net zero between 2020 – 2030 Net zero by 2050 PepsiCo Siemens Danone Net zero by 2040 Net zero by 2030 Net zero by 2050 LG Amazon Ford Net zero by 2040 Carbon neutral by 2030 Net zero by 2050 IKEA Nestlé Mercedes Benz Carbon negative by 2030 Net zero by 2050 Net zero by 2040 Microsoft Best Buy Nike Carbon negative by 2030 Net zero by 2040 Net zero by 2050 Unilever General Motors Shell Carbon neutral before 2030 Carbon neutral by 2040 Net zero by 2050 6 Note: Page not intended to represent that these are all Origin customers. Source: Press search and company websites.

Nearly half of all global emissions Origin’s mission is to enable the world’s come from making products transition to sustainable materials Total global emissions, 2016 Fossil-based Sustainable-based Energy for Road 1 Chemicals 10.6Mn <1% Transportation Daily barrels of oil consumed Of annually available 900Mn 2 Other Industry by the chemicals market tons of forest residue and Energy for Other 4 wood waste Transportation Unallocated fuel Iron and Steel combustion, Emitting Avoiding fugitive 49.4 emissions and 3 2.78kg >100% Waste other Gt CO eq. 2 Carbon emissions per kg Carbon reduction for Origin’s Cement of fossil-based PET PET vs. fossil-based PET produced Energy for Agriculture, The Origin platform can replace oil as Buildings Forestry, and Other Land Use the foundational feedstock for the materials economy 1. Includes energy-related emissions from the manufacturing of chemicals as well as direct industrial process. 2. Includes energy-related emissions in mining and quarrying, construction, textiles, machinery, food and tobacco, 7 paper & pulp and other industries. 3. Includes energy-related emissions from the use of machinery in agriculture and fishing. 4. Includes energy-related emissions in aviation, shipping, rail and pipeline transportation. Source: Origin Materials estimates, Climate Watch, the World Resources Institute (2020), ourworldindata.org.

Ubiquitous plastics are a prime target to begin reducing carbon emissions Plastics enable modern life… … but we need better, scalable solutions Million tons Drop-in ready – change only happens at scale Transforming the materials economy won’t happen in niche markets. Plastics permeate every sector and Origin’s products are supply-chain ready 546 alternatives for fossil-based feedstocks ~2x Negative-to-low carbon Sustainably harvested, renewable feedstocks (e.g., forest waste / residues) 269 can convert naturally captured carbon into useable end products ~5x Sustainable, end of life solutions (recycle first) 60 Responsible plastics use goes from ‘cradle to grave’. Enabling the circular economy through high rates of recycling is a must for any solution 1980 2010 2040 8 Source: International Energy Agency and Origin internal estimates.

The Origin platform: ‘Once in a planet’ shift from fossil to decarbonized materials Abundant, low-cost, Countless products can be manufactured Origin Core Technology bio-feedstocks using Origin’s carbon negative materials... NOT EXHAUSTIVE Textiles and fabrics “CMF” 5-Chloro- wood chips methyl- Next-gen packaging furfural Paints, coatings, and epoxies Carbon Negative cotton trash bagasse Filler for tires and more Flexible “HTC” Hydrothermal pulp waste cardboard Solid fuels Carbon Lowest Cost, Beats Petroleum C Agriculture & soil products rice hulls whole cane 9 Source: Origin Materials.

Origin’s CMF is a carbon negative solution for recyclability and degradability Today Future Near-term (2022-25+) Mid-term: PET/F Blend Long-term (2027+) (2025-27+) PET PEF Drop-in ready; 100% recyclable Technology is ready; timing dependent on market adoption 1 PET Production Life Cycle Analysis, kg-CO / kg-PET 2 High-Performance 2.78 Strong Gas Barrier Properties High Heat Resistance -101% 3 100% Recyclable 4 -0.02 Degradable 2 Fossil PET Origin PET 1. Process step carbon impacts are derived from Deloitte ISO compliant LCA report. Deviations from supply chain described in LCA report may affect carbon impacts. 2. Southern Pine based bio-PET. 3. PEF can be recycled by the same mechanical methods used for PET. Currently there are no independent PEF recycling stream or U.S. guidelines for blending PEF and PET streams. 4. PEF degradation time in industrial composting conditions (58 °C) range from 7 to 13 10 months to 90% degradation, depending on conditions, according to “First Results Accelerated Tests Biodegradation of PEF,” Organic Waste Systems (OWS), Gent, Belgium. Source: Origin Materials.

Origin’s HTC is a diverse, high-potential carbon negative platform material Today Near-term (2022-25+) Mid-term (2025-27+) Long-term (2027+) Future Fuel pellets/Activated Carbon (~$20Bn) Carbon Black (~$20Bn) Agriculture (~$40Bn) A drop-in ready, energy dense, A carbon negative carbon black replacement for A next-generation agriculture additive fuel alternative tires, foams, and dyes to improve farming efficiency { 1 Carbon footprint Key Properties No Detectable Carcinogens Net 0 Annual growth rate of Carbon Black Production Life Cycle Analysis, Porous, High Surface Area >7% fuel pellet market kg-CO / kg-Carbon Black 2 3.3 { { Available Water Capacity A carbon negative solution for -150% food and water treatment High Cation Exchange ~500 - 2 m /g – Ultra high { Applications surface area 3,000 -1.67 Ÿ Biochar, slow-release fertilizer, microbials 2 Annual growth rate of Origin HTC Fossil Carbon Black / biologics, soil amendment >8% activated carbon market 1. Origin carbon black does not contain any PAH, or polyaromatic hydrocarbons, which are carcinogens found in fossil carbon black. 11 2. Derived from Deloitte ISO compliant LCA report. Deviations from supply chain described in LCA report may affect carbon impacts. Source: Origin Materials, PBL Netherlands Environmental Assessment Agency.

Origin’s platform technology decarbonization impact 1 By 2030, Origin’s operating plants are expected to annually avoid ~8.3MMT CO equivalent to approximately… 2 ~960,000 ~1,800,000 ~19,000,000 homes' electricity use for 1 year passenger vehicles driven for 1 year barrels of oil consumed 1. Million Metric Tons. 12 Source: Origin Materials calculations based on 6 commercial scale plants and plant life cycle impact estimates. U.S. Environmental Protection Agency greenhouse gas equivalencies calculation: https://www.epa.gov/energy/greenhouse-gas-equivalencies-calculator

Estimated total addressable market for Origin products is more than $1Trn Origin addresses a growing market with broad applications HTC market CMF market Markets | Market Size $ Cumulative TAM = >$1Trn Near term focus pre-2030 PET Fiber | ~$175Bn >$390Bn market Apparel Carpet PET Resin | ~$145Bn Food and beverage packaging Carbon | ~$70Bn $390Bn Tires Activated Carbon $750B Foams Fuel pellets Near-term focus TAM is expected to grow by ~$15Bn annually 13 Source: Origin Materials management estimates based on 2030 addressable market.

Estimated total addressable market for Origin products is more than $1Trn Origin addresses a growing market with broad applications HTC market CMF market Select Markets | Market Size $ Cumulative TAM = >$1Trn Long term focus post-2030 Paints & Coatings | ~$30Bn >$750Bn market Colorants Soil Additives | ~$40Bn Soil Nutrients PEF | ~$225Bn Apparel PET Applications Packaging Epoxies | ~$15Bn Adhesives Coatings $390Bn Plasticizers | ~$18Bn $750B PVC Piping 14 Source: Origin Materials management estimates based on 2030 addressable market.

Origin is supported by Global Fortune 500 companies We believe total estimated plastics demand from these three customers represents… 4.75Mn Tons ~20 Commercial facilities required to meet PET 1 demand 2017 15 15 1. Illustrative opportunity from fulfilling estimated PET portion of PepsiCo, Danone, and Nestlé Waters combined annual consumption of 4.75 million tons of plastics / year. Source: Company websites; Origin Materials management estimates.

AECI SANS Technical Fibers Partnership “Origin Materials and AECI SANS Technical Fibers to Develop Carbon-Negative Materials for Apparel and Automotive Applications” – April 5, 2021 • AECI SANS Technical Fibers is a leader in engineered thread for high-performance apparel and automotive applications • Expands existing joint development agreement in order to develop high-performance fibers for diverse thread applications serving the apparel, footwear and automotive industries • AECI SANS Technical Fibers signed a capacity reservation agreement for carbon-negative PET and next-generation polymers produced using the Origin platform 16

AECI Much Asphalt Partnership “Origin Materials and AECI Much Asphalt to Develop Low-Carbon Asphalt” – April 6, 2021 • AECI Much Asphalt is the largest commercial asphalt producer in southern Africa • Region’s leading manufacturer and supplier of hot and cold mix asphalt products, and a manufacturer, supplier and applicator of bituminous road binders, emulsions, primes, pre-coats and modified binders • The collaboration is expected to create substantial value in the developing African market, where AECI Much Asphalt is currently active 17

Packaging Matters Partnership “Origin Materials and Packaging Matters Launch Partnership to Develop Advanced Carbon-Negative Packaging Solutions, Building on Existing 10-Year Supply Agreement” – April 12, 2021 • Packaging Matters is a leader in packaging innovation with several Fortune 100 food companies as customers • Development work to produce advanced packaging materials, including PEF • Packaging Matters will transition its virgin petroleum- based PET purchases to sustainable carbon-negative PET from Origin Materials. • As the companies make progress on developing PEF applications, some or potentially all of the supply is expected to transition to PEF • 40+ years PET experience • 3 manufacturing facilities in the United States 18

PrimaLoft Partnership “Origin Materials and PrimaLoft Form Strategic Alliance to Develop Carbon-Negative Insulating Fiber for Outdoor Gear, Bedding, and Apparel” – April 19, 2021 • PrimaLoft is advanced material technology company and a world leader in the development of high-performance insulations and fabrics • Launched strategic alliance to develop high-performance, carbon-negative insulating fibers for diverse apparel applications, including for leading outdoor, fashion, and lifestyle brands, plus home goods applications such as hypoallergenic insulated bedding • Signed capacity reservation agreement for carbon-negative PET produced using the Origin Materials technology platform • Fibers to address demand for sustainable, high-performance materials from over 900 global brand partners • PrimaLoft iconic brand partners include Patagonia, Stone Island, L.L. Bean, Lululemon, adidas and Nike 19

Solvay Partnership Solvay and Origin Materials to Develop Advanced Carbon- Negative Materials for Automotive Industry • Solvay, founded 1863, is a global leader in chemicals and materials with more than 23,000 employees in 64 countries, and net sales of €9 billion in 2020 • Collaboration to develop advanced materials for the automotive industry, including a drop-in ready specialty polyamide, a polymer for internal combustion engine technology as well as e-mobility systems like e-motors and power electronics that can provide resistance to heat, toughness, corrosion, and operate at high voltages • The companies believe these materials will be critical to decarbonize supply chains in the automotive industry and achieve the zero-carbon car • “The cooperation with Origin Materials is a new important element in our continuous commitment to sustainability which, together with our customers, is at the heart of our operations and growth strategy,” said Mike Finelli, President of Solvay Specialty Polymers. “Today carbon negative-materials can be added to the evolution of our sustainability roadmap, which already includes different actions from the integrated use of renewables to generate electricity in our plants to pursuing more sustainable products with bio- sourced monomers or recycled content.” 20

Origin has generated ~$2.4Bn in customer demand 1 ~$1.9Bn in either offtake agreements or capacity reservations Customer demand, $Mn cumulative Select Origin Customers Contracted $547Mn ~$2.4Bn ~$1Bn Additional $1,096Mn Demand Since Transaction Announcement $779Mn Offtake Capacity In Total 1 Agreement Reservation Negotiations 21 1. Includes $264Mn specified as customer option. Figures assume maximum offtake amounts and exercise of full customer option. Source: Origin Materials.

Origin is building on a strong foundation toward rapid growth… 2008-2009 2014 2017 2019 2022 2025 2027 2028-2029 1st bioplastics Proof of bottle created concept Established Pilot Partnerships Construction Production Commercial Expansion Growth Origin founded by Demonstrated Initial investor Detailed Origin 1 Origin 1 expected Launch Origin 2, Origin 3 launch Origin 4 & 5 John Bissell and technology at pilot commitments engineering and to operate by year commercial scale launched Ryan Smith scale module end 2022 CMF plant fabrication start Expect contracted Expect contracted portion of Origin 4 portion of Origin 2 to be 100% sold and Origin 3 to be out 100% sold out Partnerships / …with detailed expansion plans to Licenses announced 2030 and beyond 22 Source: Origin Materials.

Construction schedule – Origin 1, Origin 2, and Origin 3 2021 2022 2023 2024 2025 2026 2027 Onsite Construction & Origin 1 Origin 1 Operating Mechanical Completion Module Start Up Erection Today Construction & Site Selection Fabrication Start Mechanically Complete Origin 2 Origin 2 Operating Project Development Engineering, Procurement, & Construction 1 FEED Package Complete EPC Selection Start Up Engineering, Procurement, & Origin 3 Origin 3 Project Development Construction Operating Start Up 23 1. Front-end engineering design.

Origin 1 (Sarnia, Ontario, Canada) Ÿ Construction site in Sarnia, Ontario (Canada) Ÿ Origin 1 construction is advanced and is expected to be operating by year end 2022 Ÿ 17 large, complex equipment modules were fabricated by Koch Modular Process Systems (along with other equipment) and are now sitting onsite awaiting installation Ÿ Construction progress includes installing most building foundations, foundations for main process areas, underground services, as well as trailers, fencing, and communications for the site 24

Origin 1 (Sarnia, Ontario, Canada) Tanks in construction yard Core process modules awaiting installation 25

3D diagram of the Origin 1 Plant Site in Sarnia, Ontario 26

Origin is delivering transformational chemistry through mature, industry- standard equipment, materials, and technical processes Origin IP, chemistry, and production processes Material recycling and reuse Liquid phase reactors Decantation Distillation Wood yard transport Filtration Used in ~100% Majority Ubiquitous existing of pulp facilities of oil and chemical company processes in oil and chemical company industry processes Patent families protect untested mechanical unique CMF and HTC processes required for 19 Zero 1 production processes operations / scale-up 27 1. Origin does not rely on any novel mechanical processes in its plants. All of Origin’s mechanical processes are standard mechanical processes utilized in the chemicals and refining industry. Source: Origin Materials.

Origin’s use of timber and forest residues as feedstock is a potential game changer 8x-14x cheaper than Decoupled from supply Leverages waste, cleans competing renewable volatility of the oil markets forests, and lets food be food feedstocks Feedstock price Indexed price (1 = Q1 2016 value) ~$700/ton 2.5 Utilize waste 2.0 1.5 Improve forest ~$400/ton ~14x management 1.0 ~8x WTI 0.5 Pine pulpwood ~$50/ton Let food be food 0 1 Sugar Corn syrup Pine 2016 2017 2018 2019 2020 pulpwood 28 1. Representative chemically relevant sugars such as glucose and high fructose corn syrup. Source: North Carolina State University; Economic Research Service, USDA; Macrotrends; and Origin Materials estimates.

Origin is pursuing a capital efficient strategy to optimize CAPEX Origin’s strategy: Origin is keenly aware that capital efficiency will be the major driver of Work with partners to #1 its long term profitability. >40 identify suitable aging / Identify & defunct pulp mill For this reason, Origin is pursuing a Potential brownfield sites (e.g., closed pulp mills) purchase mill in the US & Canada built in the last 50 years pulp mill “brownfield” CAPEX strategy to save ~$100Mn on its total commercial plant CAPEX Leverage key components #2 needed for its wood >$100Mn Convert handling process (e.g., Total useable value of converted equipment, Wood chip equipment utilities, boiler, wood yard) even after considering expected upgrade costs waste streams Integrate refurbished #3 components into the rest of Up to 15% Pulp mill its necessary equipment / Integrate & Net savings on total plant CAPEX, or ~$100Mn scale plant infrastructure co-location benefit operate Pulp mill “brownfield” strategy offers additional benefits, including the existing forest supply chain ecosystem and local gov’t incentives 29 Source: Origin Materials.

Origin has meaningful advantages over bioplastics companies Origin advantaged category Company A Company B Company C vs. non-fossil competitors Fossil PHA PEF / FDCA PLA $1,960 Origin… TAM $1,000 $250 $1.5 - $5.0 $ Bn $0.1 - $0.5 ~0.7 Larger TAM 1 Carbon footprint , 0.3 0.3 1.0 <0 indexed to fossil $0.36 Illustrative feedstock $0.36 $0.03 Less $0.18 $0.15 cost, $/lb Timber Vegetable Oil Fructose Glucose Oil expensive Process reliability Chemical Fermentation Chemical Fermentation Chemical More sustainable Market maturity Established Nascent Nascent Nascent Established Extremely Strong existing No existing Limited Strong existing Recyclability limited Lower risk 2 infrastructure infrastructure Infrastructure infrastructure infrastructure Non-degradable Natural Industrial Industrial Non- Degradability PET; Industrial 3 composting composting composting degradable 3 composting PEF 1. For end product; carbon footprint based on publicly available feedstock footprint for analogous biofuels process (CORSIA, REDII). 2. Refers only to PET. 30 3. Further study needed to determine if industrial composting reproduces results observed in degradation studies. Source: Company websites, filings and press releases; Market and technical research reports; Origin Materials management team.

Origin brings an unrivaled set of industry veterans, leaders, and visionaries John Bissell Rich Riley Nate Whaley Stephen Galowitz Co-Founder Co-CEO CFO CCO & Co-CEO Ÿ Co-founder / Chief Ÿ Former CEO ShazamŸ 20 years C-Suite Development Officer and senior executive experience scaling Ÿ Founded Origin of Renewables at Yahoo! complex high growth Materials in 2008 company business across Ÿ 20+ years managing Ÿ Featured on Forbes industries Ÿ 15 years experience in rapid-growth 30 under 30 renewables space organizations Ryan Smith Mako Masuno, PhD Roman Wolff Josh Lee Co-Founder & CTO VP of R&D VP of Engineering General Counsel Ÿ Founded Origin Ÿ Pathway Development Ÿ Engineering leader at • Attorney at Irell & Materials in 2008 & Optimization Expert TETRA Technologies Manella, LLP • Sr. Analyst at Ÿ Process Engineer at Ÿ Organic Chemistry Ÿ 30 years of experience Strumwasser & NEC Electronics Professor in engineering on more Woocher, LLP than 20 projects 31

Origin’s technical leadership team is proven Recent hires further strengthen global technology leadership in carbon-negative materials Technical leadership Recent additions to technical leadership team Mako Masuno, PhD Roman Wolff Phil McAllister Jim Wells Madhu Anand, PhD Ben Freireich, PhD VP of R&D VP of Engineering Project Director Technical Director Technical Director Technical Fellow • Pathway Development • Engineering leader at TETRA • 20+ years chemical industry • 39 years experience at The • 15+ years of experience in • Former Technical Director of & Optimization Expert Technologies experience Dow Chemical Company the oil and energy industry Particulate Solid Research, Inc. • Organic Chemistry Professor• 30 years of experience in • Experience leading • Expertise developing, • Former Phillips 66 Chief (PSRI) • 9+ years of technology engineering on more than 20 geographically dispersed designing, building and Engineer of Hydroprocessing• Former Research Scientist in development at Origin projects project teams to design, starting up industrial & Naphtha Upgrading Core R&D at The Dow Materials build and start-up industrial chemical plants; specializing • Auburn University 2007 Chemical Company chemical plants in unique areas of technology Outstanding Graduate Award • B.S. Mechanical Engineering, • Graduated University of • Former Associate Director of for excellence in research Milwaukee School of Edinburgh with a Bachelor of Technology for the Dow • B.S. Chemical Engineering, Engineering; M.S. Engineering in Chemical AgroScience division Panjab University in India; Engineering, Ph.D. Engineering • B.S. Chemical Engineering, Ph.D. Chemical Engineering Mechanical Engineering, Cornell University from Auburn University Purdue University 32

Origin’s world-class directors will provide governance and expertise to Origin as it scales the business Karen Richardson John Bissell Rich Riley William Harvey Co-Founder & Co-CEO Chair Co-CEO • Founded Origin Materials • Board Member at BP, • Former CEO Shazam and • Former President at in 2008 Exponent, Doma senior executive at Yahoo! DuPont Packaging and Industrial Polymers • Featured on Forbes • Former Board Member at • 20+ years managing rapid- 30 under 30 WorldPay and BT Plc growth organizations • 40+ years chemical industry experience Kathy Fish Charles Drucker Boon Sim Benno Dorer • Former Chief Research, • Former Chairman & CEO • Managing Partner of • Former CEO at The Clorox Development and at Vantiv/WorldPay Artius Capital Partners Company Innovation Officer at • Over 30 years as highly • 30+ years of • Former Global Marketing Procter & Gamble successful technology/fin- investment and Director at Proctor & • 39 years experience with tech operator; created financial services Gamble Procter & Gamble over $40bn of value for experience • Board Member at VF Vantiv/WorldPay over a Corporation 10-year period as CEO 33

Origin expects to deliver a superior financial profile for years to come # Completed Plants 1 1 2 2 3 4 5 7 • Revenue and materials volume Revenue ($Mn) forecast / growth based on $4,019 satisfying existing customer off- Industrial Materials take contracts and expected +48% p.a. future demand Consumer Materials $2,759 50% $2,138• Pricing assumptions are based 47% on negotiated contract pricing $1,499 44% +140% p.a. with existing customers $830 41% $475 50% • Feedstock cost assumptions 53% 35% 56% 31% 1 59% 1 reflect historically low volatility $122 $60 $0 65% $0 69% of pine pulpwood prices 2021E 22E 23E 24E 25E 26E 27E 28E 29E 2030E • Cost assumptions also include additional required overhead EBITDA ($Mn) during scaling $2,360 • EBITDA margins and associated growth are expected to +68% p.a. improve throughout the $1,473 forecast period as a result of $1,041 increasing economies of scale +113% p.a. $600 from additional plants coming $296 online $139 ($25) ($36) ($50) ($53) • Includes R&D expenditures to maintain Origin as the global EBITDA Margin % 29% 36% 40% 49% 53% 59% leader in low or negative 2 carbon material technologies Adj. Plant Profit Margin % 39% 46% 46% 53% 57% 61% 2021E 22E 23E 24E 25E 26E 27E 28E 29E 2030E Source: Origin Materials management estimates. 34 1. 100% of revenue allocated to consumer materials. 2. A non-GAAP measure defined as Revenue less all plant direct cash costs (excluding depreciation, amortization, interest and taxes) divided by revenue.

Origin could see significant additional revenue potential # Completed Plants (2 trains/plant) 1 1 2 2 3 4 5 7 Revenue ($Mn) • Assumes Origin is able to $9,090 secure moderately higher Additional Revenue Potential +53% p.a. prices in new customer Base Case Revenue contracts as a result of strong $6,126 demand and carbon negative $4,678 materials scarcity $3,259 +202% p.a. • Concurrently, assumes Origin $1,655 $887 adds capacity at a faster rate $122 $60 1 $0 $0 than base business plan , adding two trains per new 2021E 22E 23E 24E 25E 26E 27E 28E 29E 2030E plant, effectively doubling EBITDA ($Mn) capacity of each Additional EBITDA Potential $5,966 +67% p.a.• Feedstock prices assumed Base Case EBITDA unchanged as primary feedstock supply (forest / wood $3,752 processing residues) is ample $2,683 and well above Origin’s needs +105% p.a. $1,656 $764 $372 ($25) ($36) ($50) ($53) EBITDA Margin % 42% 46% 51% 57% 61% 66% 2021E 22E 23E 24E 25E 26E 27E 28E 29E 2030E 35 1. Subject to capital availability. Source: Origin Materials management estimates.

Long-term target operating model Origin Plant 1 Origin Plant 2 Origin Plant 3-7 Average Illustrative Run-Rate Economics 49 2,205 2,205 Mn lb. biomass input 146 2,412 1,313 Mn lb. products sold 1 $70 $1,072 $811 CapEx ($Mn) ROIC (Adj. plant margin/CapEx) NM 35.9% 51.1% $Mn $/lb. product $Mn $/lb. product $Mn $/lb. product Revenue $122 $0.84 $708 $0.29 $637 $0.49 $291 Consumer materials $414 $122 $294 $346 Industrial materials ($7) ($0.05) ($56) ($0.02) ($56) ($0.04) Biomass feedstock Other feedstock & variable costs ($7) ($0.05) ($93) ($0.04) ($108) ($0.08) ($106) ($0.73) ($154) ($0.06) ($39) ($0.03) Tolling & downstream processing 2 $2 $0.01 $405 $0.17 $435 $0.33 Adj. Contribution Plant labor + other fixed costs ($6) ($0.04) ($20) ($0.01) ($20) ($0.02) ($4) ($0.03) $385 $0.16 $415 $0.32 Adj. Plant Profit PET, PET/F, PEF, CMF, FDCA, PET/F, CMF, higher value PET, HTC fuel carbon black, activated carbon, Primary Products application development samples HTC fuel 1. Denotes incremental capex to be spent in 2021-2022. 36 2. Reflected as adjusted gross profit in the base case projections included in the registration statement as filed with the SEC by Artius on March 9, 2021. Source: Origin Materials management estimates.

Anticipated to be fully funded to EBITDA profitability 3 Origin 1 and Origin 2 Growth CAPEX Schedule ($Mn) Project Financed Growth CAPEX $482 3,4 Cash Flow Sources & Uses from 2021E to Origin 2 Revenue in 2025E Local, State, and Federal Government Incentives / Support Equity Financed Growth CAPEX Gross Proceeds $925 $277 $399 Less: Transaction fees and expenses (62) $40 $46 $147 1 $126 Net Proceeds $863 $111 $19 $120 $16 $191 $80 $107 $24 $95 3 $3 Add: Project Financing $558 $3 1 2 3 4 5 2021E 22E 23E 24E 25E 3 5 Add: Local, State, and Federal Government Incentives / Support 185 Remaining Cash Balance from Current Transaction to Origin 2 Revenue ($Mn) Cash to Balance Sheet at Minimum PIPE: $863 Less: Origin 1 Growth CAPEX (70) Less: Origin 2 Growth CAPEX (1,072) $607 2 Less: Cash Flow from Operations ’21 – ‘25 (218) $364 $748 $305 $246 Remaining Cash to Fund Origin 3 and Beyond $246 1 2 3 4 5 6 2021E 22E 23E 24E 25E 1. Refer to slide 48 for additional detail. Assumes no share redemptions and none of the Artius warrants to acquire 35.5Mn shares are exercised. 2. Cash flow from operations calculated as EBITDA + Working Capital + Maintenance CAPEX from 2021 until reaching Origin 2 revenue in 2025. 3. Project financing and government incentives / support have not yet been secured. 4. Represents anticipated local, state and federal government incentives / support. 37 5. Defined as net proceeds less annual cash flow from operations less equity financed growth CAPEX for Origin 1 and 2. Excludes $1Mn existing cash. 6. Prior to Origin 2 operations date in 2025E. Source: Origin Materials management estimates.

Anticipated fully funded growth plan to profitability # Completed Plants 1 1 2 2 3 4 5 7 Origin 8+ (outside of forecast horizon) Origin 4+ $1,651 Origin 3 $1,583 Total Origin 1 & 2 1 Origin 2 CAPEX: $1,142Mn $1,131 Origin 1 $957 $870 Maintenance CAPEX $587 $557 $300 $126 $111 2021E 22E 23E 24E 25E 26E 27E 28E 29E 2030E • Current transaction and anticipated financing and grants are expected to be sufficient to fully finance the construction of Origin 1 and Origin 2 and achieve EBITDA profitability • CapEx based on estimates from world-leading EPC companies that Origin will partner with to deliver holistic capital project solutions • Capacity scaling based on current customer contract commitments / orders and anticipation of demand from global industrial complex rushing to secure “drop in” decarbonized materials to meet their carbon commitments 38 1. Cash in trust and funds from PIPE transaction represent 81% of Origin 1 and 2 CAPEX. Assumes no shareholder redemptions. Source: Origin Materials management estimates. Capital Expenditures ($Mn)

Origin as a public company We will continue to build upon our customer momentum while managing operations Origin’s business combination and anticipated financing and grants are estimated to support planned operations until EBITDA positive… Scale the Complete Engineer and design Fund Origin 2 site Support research & organization’s construction and full commercial scale acquisition, development for capabilities begin operations of production facilities equipment, and new products (e.g., Origin 1 construction Origin Ag) Meanwhile, Origin plans to demonstrate momentum on a quarterly basis… Secure fully Execute EPC alliance Share updates on Engage with Develop new products committed Origin 2 agreement and construction stakeholders and and applications to and 3 production secure joint venture progress and major industry at large build on market volumes production milestones (e.g., conferences) opportunity 39

O O H Cl Origin Materials – At a Glance The world’s leading carbon negative materials company Disruptive Materials Decarbonizing Platform Enormous TAM Cost advantaged Technology Company Technology ~$1+ Trillion C $390Bn near-term focus in Timber feedstocks are Origin produces low and Enables customers’ net- polyesters; $750Bn across competitive with oil and ~10x negative carbon materials zero commitments broad range of materials cheaper than bio alternatives Protected & Validated Global Fortune 500 Massive Customer Funded to 2 3 Technology Customers & Investors Demand Commercial Scale and 11% Owned $2.4Bn growing 19 Patent Families $863Mn by customers who are also Origin expected to be fully 1 investors Core technology protected in key financed until EBITDA positive with from a diverse mix of industries countries anticipated financing and grants 1. Represents combined ownership by PepsiCo, Danone and Nestle prior to this transaction. 2. Includes $779Mn in offtake agreements, $1.096Bn in capacity reservation agreements, and $547Mn in negotiations with potential customers, with $264Mn specified as customer options. Figures assume maximum offtake amounts and exercise of full customer options. Refer to slide 21 for additional detail. 40 3. Refer to slides 37 and 48 for additional detail. Assumes no Artius share redemption. Source: Origin Materials.

Appendix

Investment Highlights Addressing Enormous and Growing Materials Economy 1 Core products are carbon negative drop-in replacements serving a ~$1Trn+ market – with diverse applications expected to deliver growth for years to come Industry Disrupting Technology Supported by Deep Competitive Advantage 2 Conversion of biomass feedstocks into drop-in chemicals, competing directly on cost with fossil-based materials while having significant advantage over alternative technologies Global Fortune 500 Customers and Investors 3 1 ~$1.9Bn of signed customer contracts and $547Mn of customer contracts under negotiation Funded to Effectively Scale and Commence Commercial Production 4 Executing on growth plan with first plant expected to be completed in 2022 and contracted portion of first two commercial plants expected to be 100% sold out in 2022. Full-scale commercial plant expected to be online by 2025 Experienced Leadership Team with Proven Track Record 5 Brings a team of industry veterans and technology leaders with ~250 years of cumulative experience – ready to deliver on its vision and operational priorities 1. Comprised of $779Mn in offtake agreements, including $264Mn in customer option, and $1.096Bn in capacity reservation. Figures assume 42 maximum offtake amounts and exercise of full customer options. Refer to slide 21 for additional detail.

The world is drowning in carbon – it needs rapid solutions 1 Pathways of global carbon dioxide emissions Select national net-zero commitments NOT EXHAUSTIVE Gt CO per year 2 Japan France UK South Korea Sweden China 2045 2060 2050 Select investment community reactions “We are asking companies to disclose a plan for how their business model will be compatible with a net zero economy” – Larry Fink, BlackRock CEO, January 2021 “Vanguard expects companies to disclose to the market how their board oversees climate-related strategy and risk management” – Vanguard, June 2020 Managers Of $40 Trillion Make Plans To Decarbonize The World – Forbes, September 2020 1. 2005-2018 emissions from Global Carbon Budget 2019. Emissions from biotic feedbacks not included (e.g.: permafrost thawing, wildfires). 2. Average of the IEA WEO 2019 Current Policies Scenario and IPCC RCP8.5 pathway. 3. Reference case used is McKinsey’s Global Energy Perspective - Reference Case 2019. NB: Projected warming estimated by 2100. 43 43 43 Source: McKinsey Quarterly 2020 Number 2 – Climate: Shared risk. Shared response, United Nations.

Origin is not feedstock limited Primary feedstock (forest / wood processing residues) Additional feedstock optionality Million tons annual availability 900 215 Distillers Mixed Wheat Wheat Grains Paper Straw Straw Orchard Corn Waste Waste Timber Timber 400 < 1% Almond Saw Shells Dust Fruit Acacia Wood Bunch Waste Switch- grass 105 180 Cassava Cane Waste Bagasse 9 Acacia Wood Waste Forest Wood Forest Wood Total residues processing residues processing waste waste 2030 Additional feedstock supply available above demand North America Other global >2X forest / wood processing residues alone 44 Source: FAOstat; USDA, BEIS 2017; ICCT 2016; Wan Nur Aifa Wan Azahar et al.; Getting to Neutral (LLNL).

Origin will look to value chain participants to complement its strengths Origin’s strengths Feedstock Product (Bottles, Origin (CMF / HTC) Monomers (PX) Plastics (PET / PEF) Additives Customer (Biomass) Fibers) “Our proprietary “Putting it all together” “Clear market pull” bread and butter” Ÿ Proprietary Ÿ Years of experience Ÿ We will leverage an already-existing industrial base of monomer, technology in a working with the end polymer, additive, and packaging / extrusion technology league of its own consumer to address ‒ Beyond Origin 2 (monomers), we will license or sell that technology to sustainability goals a value chain participant 1 Picture: Origin 1 Illustrative potential value chain participants : Origin is in discussions with multiple partners and is ready to scale its strategy through its next phase of growth 45 1. Origin Materials may or may not be in discussions with these parties. Source: Origin Materials.

Transaction Overview • Founded in 2008, Origin is the world’s leading carbon negative materials company with a mission to enable the world’s transition to sustainable materials • Artius is a publicly listed special purpose acquisition company with $725Mn cash in trust Overview • Closing is subject to Artius having a minimum cash amount of $525Mn across PIPE and cash remaining in trust account after giving effect to any redemptions 1 • $1,843Mn pro forma equity value of combined company 1 • $999Mn Enterprise Value, implies 1.2x 2026E Revenue and 3.4x 2026E EBITDA Valuation • Earnout of 29.5Mn shares vesting equally based on share price thresholds of $15, $20 and $25 per share 2 within 3, 4 and 5 years, respectively • Origin Materials shareholders rolling 100% of their equity 3 Capital • Transaction, inclusive of $200Mn PIPE financing, expected to result in $863Mn of cash to balance sheet, is anticipated, with anticipated financing and grants, to fully fund company’s operations and capital Structure expenditures until EBITDA positive 4 • 42.4% existing shareholders; 46.7% SPAC shares; 10.9% PIPE investors Ownership Artius has identified Origin Materials as a compelling investment opportunity and believes its disruptive platform technology is uniquely positioned to decarbonize the materials industry supply chain 1. At a price of $10.00 per Artius share and assumes no redemption of public shares. Refer to slide 35 for additional detail. 2. Consists of 25.0Mn shares to Origin Shareholders and 4.5Mn shares to Artius upon release from forfeiture provisions upon achievement of earnout thresholds. 46 3. Refer to slides 37 and 48 for additional detail. Assumes no redemption of public shares. 4. Assumes no redemption of public shares, that none of the 29.5Mn earnout shares are issued and a PIPE of $200Mn.

Artius Acquisition Inc. Overview Overview Value-Add • Artius Acquisition Inc. (“Artius”) was founded in July 2020 by Charles • Seasoned executives with expertise in investing, operating and Drucker and Boon Sim to invest in disruptive platform technologies transforming disruptive companies and helping them scale to with large TAM and strong secular tailwinds, led by exceptional become global market leaders and world-class public companies management teams • Track record of creating significant shareholder value organically and • Artius uses a methodical and proprietary framework and its broad inorganically by using levers of operational excellence, investing in network to originate and evaluate target companies; numerous R&D / technology and opportunistic plays companies to date have been evaluated or diligenced • Deep and extensive Fortune 500 C-suite and boardroom Due Diligence on Origin relationships; provides access at the highest level to generate immediate traction for any business opportunity and attract the • Conducted extensive private equity-style due diligence best talent for the company • Assisted by domain experts from a global consulting firm, a • Strong and broad network of direct investor relationships with long- specialist consulting firm with relevant industry expertise, leading term pension and sovereign funds, large institutional money law firms, KPMG, Franklin Associates, Quantis and Wolf Greenfield managers, foundations and family offices to aid in the creation of a stable and long-term shareholder base • Made numerous diligence calls to current and potential customers and industry participants including CEOs and key decision makers to independently evaluate technology and business model 47

Detailed transaction overview Key Transaction Terms Pro Forma Valuation ($Mn) • The transaction is subject to there being a minimum cash amount of Origin Materials Share Price $10.00 $525Mn in Artius at closing after giving effect to any shareholder Shares Outstanding (Mn) 184.3 redemptions Equity Value $1,843 • Executed subscription agreements for committed capital in connection with PIPE for $200Mn before transaction announcement 4 Existing Net Debt 20 • Earnout of 29.5Mn shares vesting equally based on share price thresholds (-) Net Cash to Balance Sheet (863) 1 of $15, $20 and $25 per share within 3, 4 and 5 years, respectively Enterprise Value $999 2 Pro Forma Ownership @ $10.00 Per Share Illustrative Sources and Uses ($Mn) Sources Shareholder Rollover $782 Artius Public Shares Artius Cash in Trust $725 39.3% Shareholder Rollover Additional PIPE Equity $200 42.4% Total Sources $1,707 Uses Shareholder Rollover $782 Cash to Balance Sheet $863 Estimated Fees and Expenses $62 PIPE Equity 3 Artius Founder Shares Total Uses $1,707 10.9% 7.4% 1. Consists of 25.0Mn shares to Origin Shareholders and 4.5Mn shares to Artius upon release from forfeiture provisions upon achievement of earnout thresholds. 2. Assumes no redemption of public shares, no earnout shares issued and a PIPE of $200Mn. Consists of 78.213Mn Shareholder Rollover Shares, 13.613Mn Artius Founder Shares, 20.000Mn PIPE Equity Shares and 72.450Mn Artius Public Shares. Pro 48 forma ownership does not reflect any adjustment for Origin net debt at closing being more than $15.3Mn. 3. Includes the deferral of a portion of the Founder Shares subject to same conditions as Earnout consideration to be provided to Origin’s existing shareholders. 4. Net debt consists of $21Mn of Debt and $1Mn of Cash.

Glossary Abbreviation Explanation Carbon negative activities or products go beyond achieving reduced carbon impact, or net zero carbon Carbon negative impact, to actually remove additional carbon dioxide from the atmosphere CMF 5-Chloromethylfurfural, organic compound obtained from dehydration derivatives 2,5-Furandicarboxylic Acid, organic compound that is a renewable resource because it can be FDCA produced from carbohydrates HTC Hydrothermal Carbon, structured compounds that have been converted from organic compounds Polyethylene Terephthalate, most common thermoplastic polyester used for packaging foods and PET beverages PEF Polyethylene Furanoate, bio-based thermoplastic polyester also primarily used for packaging pX Paraxylene, an important chemical feedstock used in the large scale synthesis of various polymers 49

We make negative carbon materials matter

About Artius

Artius Acquisition Inc (“Artius”) (NASDAQ:AACQ) is a special purpose acquisition company formed for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses. Artius was co-founded by Charles Drucker, the former Chariman and CEO of WorldPay, Inc., a leading payments company, and its predecessor company, Vantiv. Inc., and Boon Sim, the Founder and Managing Partner of Artius Capital Partners LLC. For more information, visit https://www.artiuscapital.com/acquisition .

About Origin Materials

Headquartered in West Sacramento, Micromidas, Inc. d/b/a Origin Materials is the world’s leading carbon negative materials company. Origin Materials’ mission is to enable the world’s transition to sustainable materials. Over the past 10 years, Origin Materials has developed a platform for turning the carbon found in non-food biomass into useful materials, while capturing carbon in the process. Origin Materials’ patented drop-in core technology, economics and carbon impact have been validated by trusted third parties and are supported by a growing list of major global customers and investors. Origin Materials’ first plant is expected to be operational in 2022 with a second, full-scale commercial plant expected to be operational by 2025 and plans for additional expansion over the next decade.

For more information, visit www.originmaterials.com.

Important Information for Investors and Stockholders

In connection with the proposed business combination of Origin and Artius (such proposed combination, the “proposed transaction”), Artius filed a registration statement on Form S-4 (the “Registration Statement”) with the SEC on March 9, 2021, which includes a preliminary proxy statement to be distributed to holders of Artius’s ordinary shares in connection with Artius’s solicitation of proxies for the vote by Artius’s stockholders with respect to the proposed transaction and other matters as described in the Registration Statement, as well as the prospectus relating to the offer of securities to be issued to Artius’s and Origin Materials’ stockholders in connection with the proposed transaction. After the Registration Statement has been declared effective, Artius will mail a definitive proxy statement, when available, to its stockholders. Investors and security holders and other interested parties are urged to read the proxy statement/prospectus, any amendments thereto and any other documents filed with the SEC carefully and in their entirety when they become available because they will contain important information about Artius, Origin Materials and the proposed transaction. The documents relating to the proposed transaction (when they are available) can be obtained free of charge from the SEC’s website at www.sec.gov. Free copies of these documents, once available, may also be obtained from Artius by directing a request to: Artius Management LLC, 3 Columbus Circle, Suite 2215 New York, New York 10019.

Cautionary Note on Forward-Looking Statements

This press release contains certain forward-looking statements within the meaning of the federal securities laws, including with respect to the proposed transaction between Origin Materials and Artius. Forward-looking statements generally are accompanied by words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “should,” “would,” “plan,” “predict,”

“potential,” “seem,” “seek,” “future,” “outlook,” and similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding Origin Materials’ business strategy, estimated total addressable market, commercial and operating plans, product development plans and projected financial information. These statements are based on various assumptions, whether or not identified in this press release, and on the current expectations of the management of Origin Materials and are not predictions of actual performance. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on as, a guarantee, an assurance, a prediction, or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond the control of Origin Materials and Artius. These forward-looking statements are subject to a number of risks and uncertainties, including that Origin Materials may be unable to successfully commercialize its products; the effects of competition on Origin Materials’ business; the uncertainty of the projected financial information with respect to Origin Materials; disruptions and other impacts to Origin Materials’ business as a result of the COVID-19 pandemic and other global health or economic crises; changes in customer demand; Origin Materials and Artius may be unable to successfully or timely consummate the proposed business combination, including the risk that any regulatory approvals may not obtained, may be delayed or may be subject to unanticipated conditions that could adversely affect the combined company or the expected benefits of the business combination, or that the approval of the stockholders of Artius or Origin Materials may not be obtained; failure to realize the anticipated benefits of the business combination; the amount of redemption requests made by Artius’ stockholders, and those factors discussed in the Registration Statement under the heading “Risk Factors,” and other documents Artius has filed, or will file, with the SEC. If any of these risks materialize or our assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. There may be additional risks that Origin Materials presently does not know, or that Origin Materials currently believes are immaterial, that could also cause actual results to differ from those contained in the forward-looking statements. In addition, forward-looking statements reflect Origin Materials’ expectations, plans, or forecasts of future events and views as of the date of this press release. Origin Materials anticipates that subsequent events and developments will cause its assessments to change. However, while Origin Materials may elect to update these forward-looking statements at some point in the future, Origin Materials specifically disclaim any obligation to do so. These forward-looking statements should not be relied upon as representing Origin Materials’ assessments of any date subsequent to the date of this press release. Accordingly, undue reliance should not be placed upon the forward-looking statements.

Participants in the Solicitation

This communication is not a solicitation of a proxy from any investor or security holder. However, Artius, Origin Materials and their respective directors, executive officers and employees and other persons may be deemed to be participants in the solicitation of proxies from Artius’s shareholders in connection with the proposed business combination. Information about Artius’s directors and executive officers and their ownership of Artius’s securities is set forth in the Registration Statement described above. Additional information regarding the interests of those persons and other persons who may be deemed

participants in the proposed transaction may be obtained by reading other documents Artius has filed, or will file, with the SEC regarding the proposed business combination, including the definitive proxy statement when it becomes available.

Non-Solicitation

This communication is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the potential transaction and shall not constitute an offer to sell or a solicitation of an offer to buy the securities of Artius, the combined company or Origin Materials, nor shall there be any sale of any such securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act of 1933, as amended.

Contacts

Origin Investors:

ir@originmaterials.com

Media:

media@originmaterials.com

Artius Investors:

Jason Ozone

jason@artiuscapital.com

+1-212-309-7668