#1ORIGIN Fourth Quarter 2021 Earnings Call The world's leading carbon negative materials company February 24, 2022#2Forward looking statements and disclaimers FORWARD-LOOKING STATEMENTS This presentation and the accompanying oral presentation have been prepared by Origin Materials, Inc. ("Origin") for informational purposes only and not for any other purpose. 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, access to traditional financing sources, budget and timelines to complete Origin 1, Origin 2, and Origin 3, commercial and operating plans, product development plans, anticipated growth and projected financial information. These statements are based on various assumptions, whether or not identified in this presentation, and on the current plans, objectives, estimates, expectations and intentions of the management of Origin and are not predictions of actual performance and inherently involve significant risks and uncertainties. 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. 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; and those factors discussed under the heading "Risk Factors," in the Quarterly Report on Form 10-Q for the quarter ended September 30, 2021 and other documents Origin has filed, or will file, with the SEC, including Origin's Annual Report on Form 10-K for the year ended December 31, 2021. These filings, when available, are available on the investor relations section of our website at investors.originmaterials.com and on the SEC's website at www.sec.gov. 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 of which Origin does not presently know, or that Origin 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's expectations, plans, or forecasts of future events and views as of the date of this presentation. Origin anticipates that subsequent events and developments will cause its assessments to change. However, while Origin may elect to update these forward-looking statements at some point in the future, Origin specifically disclaims any obligation to do so except as required under applicable law. These forward-looking statements should not be relied upon as representing 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. 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 document to be filed or furnished by Origin 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. Origin believes 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 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. TRADEMARKS This presentation contains trademarks, service marks, trade names and copyrights of Origin and other companies which are the property of their respective owners. ORIGIN 2#3Q4 2021 highlights Origin's mission is to help drive the world's transition to sustainable materials by providing sustainable, plant-based, zero-carbon materials designed for "drop-in" use and at economics comparable to existing fossil-fuel based materials, which are supported by a growing list of global brands including PepsiCo, Nestlé Waters, Danone, Ford Motor Company, Mitsubishi Gas Chemical, PrimaLoft, Solvay, Kolon Industries, AECI, Stepan, Mitsui & Co., Packaging Matters, and Minafin Group Origin 2 site selected and owner's engineer selected • Origin 2 site selected in Geismar, Louisiana, subject to finalization of economic incentives • Hunt, Guillot & Associates chosen as owner's engineer for Origin 2 Origin 1 and Origin 2 construction on track Customer demand is strong and broad based • Capital budget, expected construction timeline and ability to fully fund both plants from cash on hand and traditional project financing sources are on track Origin 1 remains on schedule for completion by the end of 2022. Origin 2 remains on schedule to be operational by mid-2025 Approximately $100 million of excess cash, beyond the capital budget for Origin 1 and 2, for unforeseen contingencies in addition to substantial monetary contingencies already built into our capital project planning Offtake and capacity reservation agreements now exceed $5.6 billion¹ Mitsui & Co., Ltd., a global leader in energy, machinery, chemicals, food, textile, logistics, finance, and more, announced a strategic partnership to industrialize advanced carbon negative materials. In addition, Mitsui signed a multi-year capacity reservation agreement to purchase sustainable carbon- negative materials Minafin Group, a global specialty chemical company, began a strategic partnership with Origin to industrialize high-value specialty materials 1. Includes $264Mn specified as customer option. Figures assume maximum offtake amounts and exercise of full customer option. ORIGIN 3#4Origin customer demand has more than quintupled to $5.6Bn since February announcement to go public Total demand is $5.6Bn in either offtake agreements or capacity reservations¹ Customer Demand, $Bn cumulative Select Origin Customers & Partners ~$1Bn ~$1.9Bn ~$4.2Bn ~$3.5Bn ~$5.6Bn ~$1.4Bn Additional Demand Since Q3 Earnings Call Ford MITSUBISHI GAS CHEMICAL PEPSICO Nestle PRIMALOFT. DANONE ONE PLANET. ONE HEALTH S Stepan S (AECI SOLVAY KOLON INDUSTRIES packaging MATTERS Major Asian soft drink company Transaction Announcement Analyst Day April 2021 Q2 Earnings August 2021 Q3 Earnings November 2021 Q4 Earnings February 2022 MITSUI & CO. MINAFIN GROUP February 2021 1. Includes $264Mn specified as customer option. Figures assume maximum offtake amounts and exercise of full customer option. Source: Origin Materials. Major global retail company ORIGIN 4#5Mitsui Partnership MITSUI & CO. "Origin Materials and Mitsui Form Strategic Partnership to Industrialize Advanced Carbon- Negative Chemicals and Materials" - January 10, 2022 • Mitsui & Co., Ltd., a global leader in energy, machinery, chemicals, food, textile, logistics, finance, and more, signed a multi-year capacity reservation agreement to purchase sustainable carbon-negative materials from Origin Materials This strategic partnership aims to rapidly develop and industrialize new sustainable carbon-negative products for the automotive, chemicals, electronics, packaging, textiles, construction, and personal care industries based on Origin Materials' patented technology platform The partnership will leverage Mitsui's global supply chain strength, access to Japanese and international markets, and leadership in business innovation Mitsui is a global trading and investment company with a diversified business portfolio that spans approximately 63 countries in Asia, Europe, North, Central & South America, the Middle East, Africa and Oceania Gestamp WORKING FOR A SAFER AND LIGHTER C QVC Japan, Inc. Sakhin Energy Mitsui & Co., Ltd areas of business include mineral & metal resources, energy, machinery & infrastructure, chemicals, iron and steel products, lifestyle, and innovation & corporate development.1 1. Included to indicate Mitsui & Co., Ltd. areas of business, but does not imply collaboration or product development activity in every business area. ORIGIN 5#6Minafin Partnership • • • Belgium headquartered Minafin Group is a leading developer and manufacturer of fine chemicals with three main areas of expertise: health chemistry, green chemistry, and challenging chemistry Origin + Green Chemistry Division of the Minafin Group collaboration aims to bring cost-competitive biobased products to the market, with applications in the pharmaceutical, agricultural, cosmetics and personal care, and automotive industries This partnership demonstrates Origin's expanded product offerings apart from CMF- and HTC-derived materials, for applications in specialty and fine chemicals Minafin affiliate Pennakem aims to develop new technologies with Origin to further expand the market for Pennakem's biobased products Minafin business unit EcoXtract® is in discussions with Origin to commercialize its revolutionary biobased extraction process using sustainable carbon-negative materials produced by Origin. The EcoXtractⓇ process efficiently extracts useful plant oils for food, cosmetics, and other applications MINAFIN GROUP AFBA -7/0 ORIGIN⚫#7Origin 1 and Origin 2 construction budget and timeline on track Maintain previous outlook on expected capital budget and production timelines for Origin 1 and Origin 2 Origin 1 is on track for completion by the end of 2022 • • • Origin 2 is on track to be • operational by mid-2025 Origin maintains that the previously disclosed Origin 1 and Origin 2 capital budgets and construction timelines are on track Capital budgets continue to include contingencies for unforeseen events, as is appropriate for projects of this size and phase, and we continue to monitor the impact of macroeconomic movements such as inflation and supply chain disruptions As previously disclosed, lifting and installation of previously fabricated key production equipment modules was completed in October 2021, six months ahead of the schedule announced in April 2021 During the fourth quarter 2021, the ENCON evaporator module system was placed and bolted, three months ahead of the schedule announced in April 2021 Piping fabrication began earlier this year, nearly six months ahead of the schedule announced in April 2021 Origin maintains that the previously disclosed Origin 1 construction timeline is on track, with the completed milestones further de-risking our schedule Working with Worley Limited, Deloitte Consulting, and Fisher International, Origin has selected Geismar, Louisiana for the site of Origin 2, subject to finalization of economic incentives from the State of Louisiana Hunt, Guillot & Associates selected as owner's engineer for Origin 2 Front end design is underway and detailed engineering is expected to begin in 2023, with the plant to be operational by mid-2025 ORIGIN 7#8Construction - Origin 1 update (1 of 4) The ENCON evaporator module system was placed and bolted three months ahead of the schedule announced in April 2021 ENCON evaporator module offload ENCON module system placed COPY NOTICE PERSONEL ONLY ORIGIN 8#9Construction - Origin 1 update (2 of 4) The ENCON evaporator module system was placed and bolted three months ahead of the schedule announced in April 2021 ENCON tanks being offloaded and placed ORIGIN⁹#10Construction - Origin 1 update (3 of 4) Piping fabrication began earlier this year, nearly six months ahead of the schedule announced in April 2021 Steel delivery for piping modules Piping delivery (approx. 12,000 linear feet of pipe) Small bore carbon steel piping (<3") Small bore carbon steel piping (<2") 日 ORIGIN 10#11Construction - Origin 1 update (4 of 4) Origin 1 is on track for completion by the end of 2022 C соре COPE ORIGIN 11#12Construction - Origin 2 update (1 of 3) "Origin Materials Announces Geismar, Louisiana as Location for Second Manufacturing Plant, Origin 2" - February 16, 2022 • • • The company has selected a site in Geismar, Louisiana, for the construction of its first world-scale manufacturing facility, Origin 2, subject to finalization of economic incentives from the State of Louisiana The plant is expected to convert an estimated 1 million dry metric tons of sustainable wood residues each year into carbon-negative materials used to make PET and HTC for a wide variety of end markets The site offers access to plentiful sustainable wood residues, including "residuals" or waste wood from local large-scale pulp mills. The Geismar wood basin is estimated to consist of approximately 650 million green short tons of inventory² Pending state and local incentives are estimated to be worth more than $100 million, and the State of Louisiana has preliminarily awarded Origin a Private Activity Bond volume cap allocation in the amount of $400 million Construction expected to start by mid-2023 and the plant is expected to be operational mid-2025 (Continued on next page) Louisiana 0 40 80 160 Miles Mississippi Legend Geismar Major Rivers (States) The Geismar wood basin, shown in green, offers plentiful sustainable wood residues, including "residuals" or waste wood from local large-scale pulp mills¹ 1. 2,000 pounds, inclusive of moisture content. 2. Fisher International. ORIGIN 12#13Construction - Origin 2 update (2 of 3) "Origin Materials Announces Geismar, Louisiana as Location for Second • • Manufacturing Plant, Origin 2” – February 16, 2022 • • The local industrial cluster offers access to reliable utilities, including hydrogen pipelines, ethylene pipelines, valuable inorganic species, water, and wastewater treatment Opportunities to place Origin products in the local industrial ecosystem and to participate as a customer in that ecosystem as well The site offers exceptional logistics via rail and water, located along the Mississippi River with easy barge access to the Gulf Coast, which is valuable for the distribution of chemical intermediates The site is nearby other chemical company potential partners, with approximately 15 chemical companies and refineries in the nearby Geismar area Baton Rouge and New Orleans have extremely skilled labor pools across refining, pulp and paper, forestry and agronomy, feedstock logistics, and chemicals The 150-acre facility would create an estimated 500 construction jobs, 200 local full-time positions, and between 500 and 1,000 indirect local jobs Preliminary rendering of Origin 2 at Geismar site ORIGIN 13#14Construction - Origin 2 update (3 of 3) Origin has selected Hunt, Guillot & Associates as its owner's engineer for Origin 2 • • • The owner's engineer will provide full-service engineering to support and augment Origin in all phases of the project, from early design to construction, logistics, planning, detailed scheduling, cost forecasts, progress tracking and reporting, and work stream integration As a multi-disciplined project management and engineering services company, HGA has provided professional services to an extensive portfolio of customers throughout numerous industries for 25 years. HGA has ten locations throughout Louisiana, Texas, Arkansas, and Alabama and has provided full-service offerings in over 30 states, Puerto Rico, Canada, China, and Mexico HGA is located close to many tier 1 engineering companies, the Origin 2 site in Geismar, Louisiana, and much of the Origin design team HGA owner's engineer experts have conducted multiple billion-dollar projects HGA has extensive wood handling and forest products experience HGA projects HGA ORIGIN 14#15Construction schedule - Origin 1, Origin 2, and Origin 3 2026 2027 2021 2022 2023 2024 2025 Onsite Construction & Origin 1 自 Origin 1 Operating Mechanical Completion Module Erection (achieved vs updated vs original) Start Up Construction & Site Selection Fabrication Start Mechanically Complete Origin 2 Project Development Engineering, Procurement, & Construction Origin 2 Operating FEL1 Engineering Owner's Partner Selected Engineer FEED¹ Package Complete Start Up Origin 3 1. Front-end engineering design. Selected February 2022 Engineering, Procurement, & Project Development Construction Start Up Origin 3 Operating ORIGIN 15#16• • Construction schedule - Origin 1 • Origin 1-plant purpose - Produce CMF and HTC at commercial volumes Produce CMF and HTC and other intermediates in volumes that allow customers to qualify products and applications other than PET Objectives - by end of Q3 2021 - Achieve activities required to enable module lift by end of Q4 2021 DONE Hire Process Automation Lead, additional Project Manager/ Project Engineer DONE Objectives - by end of Q4 2021 - - - - Hire Origin 1 operating leadership: Site & Plant Director, Operations Manager, Site EHS&S (Environmental Health, Safety, and Security) Manager DONE Complete structural elements of plant ISBL and complete foundations of auxiliary process buildings DONE¹ Erect main plant modules DONE Install ENCON evaporator module system DONE (Previous: Receive ENCON evaporator module system by end of Q1 2022) Objectives by end of Q1 2022 - Receive additional major equipment (tanks, etc.) • • • - Piping fabrication start DONE (Previous: By end of Q2 2022) Objectives by end of Q2 2022 1st round of operations hiring (Admin, Head of Shift Operators, Manufacturing QA/QC Lead) Objectives by middle of Q3 2022 - Electrical installation start Last major equipment arrives on site Objectives by beginning of Q4 2022 First system turnovers to commissioning and start-up team 1. Does not include biomass storage unit. Operations Origin 1 Timeline (Detail View) Capital Project 3Q2021 4Q2021 1Q2022 2Q2022 Detailed Engineering Piping Fabrication Start Install ENCON Evaporator System (achieved vs original) (achieved vs updated vs original) Construction Module Erection (achieved vs updated vs original) Organizational Design Hire Operations Leadership Hire & Train Operations Staff 3Q2022 4Q2022 1Q2023 Last Major Equipment Arrives On Site Electrical Installation Start Commissioning & Start-Up Start-Up ORIGIN 16#17Project Execution Construction schedule - Origin 2 2021 Project Development Site Screening Site Selection Site Evaluation Owner's Engineer Selected FEL1 Engineering Partner Selected Contractor Selection 2022 2023 Construction Contract Executed Front End Design (Assess, Select, Define) February 2022 • • • 2024 2025 Recent accomplishments/status - - Selected site in Geismar, Louisiana, subject to finalization of economic incentives DONE Selected Hunt, Guillot & Associates as owner's engineer DONE Objectives by end of Q1 2022 Announcement of selected site DONE Objectives by end of Q3 2022 - - - General equipment arrangements and flow diagrams Equipment selection and sizing; value engineering Objectives by end of Q4 2022 Final equipment, instrument, electrical specification and lists FEED Package Complete Detailed Engineering Construction Mechanically Complete Construction & Fabrication Start Commissioning & Start-Up Start-Up ORIGIN 17#18Key financials in-line with previous outlook Financial operating metrics for Q4 2021 are in-line with our previous outlook Origin 1 and Origin 2 capital budget and financing on track Reaffirm 2022 adjusted EBITDA forecast • With ramp up of employee hiring and operations in support of construction, product development and sales activities, Q4 2021 Adjusted EBITDA loss was $6.6 million compared to a loss of $3.8 million in the prior-year period. Full year 2021 adjusted EBITDA loss was $20 million¹ Net income was $5.2 million for the fourth quarter compared to a net loss of $23.5 million in the prior year period. Full year 2021 net income was $42.1 million Capital budget for Origin 1 and Origin 2 still anticipated to be fully funded from cash in hand and traditional project financing sources Leading financial institutions specializing in similarly sized and stage capital projects continue to confirm that our financing assumptions for Origin 2 are reasonable and executable, helped by pending state and local incentives worth more than $100 million and a Private Activity Bond ("PAB") allocation of $400 million The $400 million Private Activity Bond allocation from the State of Louisiana provides a strong foundation for the financing of Origin 2, and, in combination with certain 2021 Infrastructure Investment and Jobs Act ("IIJA") provisions, could enable the debt financing of Origin 2 using entirely tax-exempt bonds As presented previously, anticipate having approximately $100 million of excess cash, beyond the capital budget for Origin 1 and 2, for unforeseen contingencies in addition to substantial monetary contingencies already included in our capital project budgets, which is also available to fund Origin 3 Adjusted EBITDA loss forecast of up to $36 million, consistent with prior outlook¹ Capital spending is expected to be up to $155 million 1. For a reconciliation of a non-GAAP figure to the applicable GAAP figure please see the table captioned 'Reconciliation of GAAP and Non-GAAP Results' set forth on slide 22. ORIGIN 18#19ORIGIN Appendix#20Long-term target operating model Origin Plant 1 Illustrative Run-Rate Economics Mn lb. biomass input Mn lb. products sold CapEx ($Mn) ROIC (Adj. plant margin/CapEx) 49 146 $70¹ NM Origin Plant 2 Origin Plant 3-7 Average 2,205 2,412 $1,072 35.9% 2,205 1,313 $811 51.1% $Mn $/lb. product $Mn $/lb. product $Mn $/lb. product Revenue $122 $0.84 $708 $0.29 $637 $0.49 Consumer materials $414 $291 $122 Industrial materials $294 $346 Biomass feedstock ($7) ($0.05) ($56) ($0.02) ($56) ($0.04) Other feedstock & variable costs ($7) ($0.05) ($93) ($0.04) ($108) ($0.08) Tolling & downstream processing ($106) ($0.73) ($154) ($0.06) ($39) ($0.03) Adj. Contribution² $2 $0.01 $405 $0.17 $435 $0.33 Plant labor other fixed costs ($6) ($0.04) ($20) ($0.01) ($20) ($0.02) Adj. Plant Profit ($4) ($0.03) $385 $0.16 $415 $0.32 PET/F, CMF, higher value Primary Products PET, HTC fuel application development samples PET, PET/F, PEF³, CMF, FDCA4, carbon black, activated carbon, HTC fuel 1. Denotes incremental capex to be spent in 2021-2022. 2. Reflected as adjusted gross profit in the base case projections included in the registration statement on Form S-4 as filed with the SEC by Artius Acquisition Inc. ("Artius") on March 9, 2021, as amended. 3. Polyethylene furanoate. 4. Furandicarboxylic acid. Source: Origin Materials management estimates. ORIGIN 20#21Share count as of 12/31/2021 Class Total Shares Outstanding¹ Shares subject to forfeiture1 Total Shares Outstanding, including Shares subject to forfeiture¹ Public Warrants² Private Warrants² Legacy Origin Earnout Shares³ Options and RSUs 4, 5 Total Shares 5 Outstanding Shares of Common Stock 136,801,569 4,500,000 141,301,569 Shares Reserved for Future Issuance Pursuant to Potential Earnouts, Outstanding Warrants, and Options 24,150,000 11,326,667 25,000,000 15,074,862 216,853,098 1. 4.5 million shares held by a certain stockholder subject to forfeiture in three equal installments unless our Common Stock reaches certain trading price thresholds within certain specified time periods (10 consecutive trading day closing volume weighted average price targets of $15, $20, and $25 within 3, 4 and 5 years after the closing of the business combination between Artius and legacy Origin (the "Business Combination"), respectively) 2. Warrant exercise price = $11.50 per share. 3. 25,000,000 Earnout Shares are subject to issuance in three equal installments if our Common Stock reaches certain trading price thresholds within certain specified time periods (10 consecutive trading day closing volume weighted average price targets of $15, $20, and $25 within 3, 4 and 5 years after the closing of the Business Combination, respectively). 4. Includes 6,411,326 options with a weighted average strike price of $0.21/share and 1,481,531 performance-based options at $0.14/share (423,294, 634,942, and 423,295 performance-based options vest if our Common Stock reaches volume weighted average price thresholds of $15, $25, and $50 per share respectively for 10 consecutive trading days), 769,505 Restricted Stock Units, and 2,137,500 Performance Stock Units under which the maximum award can be up to 6,412,500 shares. 5. Excludes shares available for future issuance pursuant to our equity incentive plan and employee stock purchase plan. ORIGIN 21#22Reconciliation of GAAP and Non-GAAP results We believe that the presentation of Adjusted Earnings before Interest, Taxes, Depreciation, and Amortization (Adjusted EBITDA) is appropriate to provide additional information to investors about our operating profitability adjusted for certain non-cash items, non-routine items that we do not expect to continue at the same level in the future, as well as other items that are not core to our operations. Further, we believe Adjusted EBITDA provides a meaningful measure of operating profitability because we use it for evaluating our business performance, making budgeting decisions, and comparing our performance against that of other peer companies using similar measures. We define Adjusted EBITDA as net income or loss adjusted for (i) stock-based compensation expense, (ii) depreciation and amortization, (iii) interest income, (iv) interest expense, net of capitalized interest, (v) change in fair value of derivative liabilities, (vi) change in fair value of warrants liability, (vii) change in fair value of earnout liability, (viii) professional fees related to completed mergers, and (ix) other income, net. Three months ended December 31, (in thousands) Net income (loss) Stock based compensation Depreciation and amortization Interest income Interest expense, net of capitalized interest Change in fair value of derivative liabilities 2021 2020 Year ended December 31, 2021 2020 5,237 $ 959 (23,534) $ 1,552 42,090 $ 5,767 (30,302) 1,630 181 174 544 479 (1,413) (1,413) (1) 175 2,838 341 (100) 1,036 1,326 1,088 Change in fair value of warrants liability (2,838) 17,370 4,525 18,498 Change in fair value of earnout liability (8,480) (75,488) Professional fees related to completed mergers Other income, net (160) (568) Adjusted EBITDA $ (6,615) $ (3,796) $ 640 (811) (19,982) $ (805) (9,071) ORIGIN 22#23ORIGIN The world's leading carbon negative materials company