Document:

EX-10.2

 Exhibit 10.2 

February 16, 2021 
 Artius Acquisition Inc. 

3 Columbus Circle, Suite 2215 
 New York, NY 10019 

Re: Sponsor Letter Agreement  
 Ladies and Gentlemen:

 This letter agreement (this “Letter Agreement”) is being delivered in connection with the Agreement and Plan of Merger and Reorganization
(the “Merger Agreement”), dated as of the date hereof, by and among (i) Artius Acquisition Inc., a Cayman Islands exempted company (“Artius”), (ii) Micromidas, Inc., a Delaware corporation (the
“Company”) and (iii) Zero Carbon Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of Artius. Certain capitalized terms used herein are defined in paragraph 5 hereof. Capitalized terms used but not otherwise
defined herein shall have the respective meanings ascribed to such terms in the Merger Agreement. 
 In order to induce the Company and Artius to enter into
the Merger Agreement and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Artius Acquisition Partners LLC (the “Sponsor”) agrees with Artius, as follows: 

 

	1.	 Sponsor Voting Agreements. The Sponsor shall: 

 

	 	a)	 appear at the Artius Stockholder Meeting or otherwise cause all of the Founder Shares owned by it to be counted
as present thereat for the purpose of establishing a quorum; 

  

	 	b)	 vote or cause to be voted at the Artius Stockholder Meeting all of its Founder Shares (i) in favor of each
Artius Stockholder Voting Matter and any other matters necessary or reasonably requested by Artius in connection with the Transactions and (ii) against any proposal in opposition to the approval of the Merger Agreement or inconsistent with the
Merger Agreement or the Transactions; and 

  

	 	c)	 not redeem any of its Founder Shares in connection with the Required Artius Vote. 

 The obligations of Sponsor specified in this paragraph 1 shall apply whether or not the Merger or any action
described above is recommended by the Artius Board or the Artius Board has effected an Artius Change in Recommendation. 
  

	2.	 Vesting Provisions for Founder Shares. The Sponsor agrees that, effective upon the Closing, 4,500,000
Founder Shares then held by the Sponsor shall be subject to the vesting and forfeiture provisions set forth in this paragraph 2 (the “Sponsor Vesting Shares”). In addition to and without limiting any restrictions on Transfers set
forth in the Lock-up Agreement, the Sponsor agrees that it shall not (and will cause its Affiliates not to) Transfer any unvested Sponsor Vesting Shares prior to the date such Sponsor Vesting Shares become
vested pursuant to this paragraph 2. 

  

	 	a)	 Vesting of Shares. 

 

	 	i.	 One third of the Sponsor Vesting Shares shall vest at such time as a $15.00 Stock Price Level is reached during
the three (3) year period following the Closing Date (the Sponsor Vesting Shares eligible to vest pursuant to this paragraph, the “First Tranche Vesting Shares”). 

 

	 	ii.	 One third of the Sponsor Vesting Shares shall vest at such time as a $20.00 Stock Price Level is reached during
the four (4) year period following the Closing Date (the Sponsor Vesting Shares eligible to vest pursuant to this paragraph, the “Second Tranche Vesting Shares”). 

 

	 	iii.	 One third of the Sponsor Vesting Shares shall vest at such time as a $25.00 Stock Price Level is reached during
the five (5) year period following the Closing Date (the Sponsor Vesting Shares eligible to vest pursuant to this paragraph, the “Third Tranche Vesting Shares”). 

 

	 	  	 Upon vesting pursuant to this paragraph 2(a), any such vested shares shall be owned by the Sponsor free and
clear of any restrictions under this Letter Agreement. 

  

	 	b)	 Dividends. The Sponsor shall not be entitled to receive dividends and other distributions with respect
to such Sponsor Vesting Shares prior to vesting; provided, that dividends and other distributions with respect to Sponsor Vesting Shares shall be set aside by Artius and shall be paid to the Sponsor upon the vesting of such Sponsor Vesting
Shares. 

  

	 	c)	 Acceleration of Vesting upon an Artius Sale. Notwithstanding the foregoing, in the event Artius enters
into a definitive agreement with respect to an Artius Sale on or before the fifth (5th) anniversary of the Closing Date, all Sponsor Vesting Shares that have not been forfeited pursuant to paragraph 2(d) and remain unvested, if any, shall vest on
the day prior to the closing of such Artius Sale. For the avoidance of doubt, following a transaction or business combination that is 

	 	
not an “Artius Sale” hereunder, including a transaction or business combination in which the equity securities of the surviving entity of such business combination or other transaction
to be received by the Sponsor are registered under the Exchange Act and listed or quoted for trading on a national securities exchange, the equitable adjustment provisions of paragraph 11 shall apply, including, without limitation, to the
performance vesting criteria set forth in paragraph 2(a). 

  

	 	d)	 Forfeiture of Unvested Sponsor Vesting Shares. First Tranche Vesting Shares that remain unvested on the
first Business Day after the third (3rd) anniversary of the Closing Date shall be surrendered by the Sponsor to Artius, without any consideration therefor. Second Tranche Vesting Shares that
remain unvested on the first Business Day after the fourth (4th) anniversary of the Closing Date shall be surrendered by the Sponsor to Artius, without any consideration therefor. Third Tranche
Vesting Shares that remain unvested on the first Business Day after the fifth (5th) anniversary of the Closing Date shall be surrendered by the Sponsor to Artius, without any consideration therefor. The Sponsor shall forfeit the right to receive any
accrued dividends in respect of any Sponsor Vesting shares forfeited pursuant to this paragraph. 

  

	 	e)	 Stock Price Level. For purposes of paragraph 2(a), the applicable “Stock Price Level”
will be considered achieved only when the VWAP of Artius Class A Common Stock equals or exceeds the applicable threshold for 10 consecutive trading days during the specified time period. The Stock Price Levels shall be adjusted appropriately in
light of any stock dividend, share capitalization, subdivision, reclassification, recapitalization, split, combination, consolidation or exchange of shares, or any similar event related to the Artius Class A Common Stock. 

 

	 	f)	 Waiver of Conversion Ratio Adjustment. (A) Section 17.2 of the Artius A&R Memorandum and
Articles provides that each Founder Share shall automatically convert into one Artius Class A Ordinary Share (the “Initial Conversion Ratio”) at the time of the Business Combination, and (B) Section 17.3 of the Artius
A&R Memorandum and Articles provides that the Initial Conversion Ratio shall be adjusted (an “Adjustment”) in the event that additional Artius Class A Common Shares or any other “Equity-linked Securities” (as
defined in the Artius A&R Memorandum and Articles) are issued in excess of the amounts offered in Artius’ initial public offering of securities and related to the closing of a Business Combination such that the Sponsor shall continue to own
20% of the issued and outstanding shares of Artius Capital Stock and Equity-linked Securities after giving effect to such issuance (excluding any shares of Artius Capital Stock or Equity-linked Securities issued to any seller in a Business
Combination). As of and conditioned upon the Closing, the Sponsor hereby irrevocably relinquishes and waives any and all rights the Sponsor has or will have under Section 17.3 of the Artius A&R Memorandum and Articles to receive shares of
Artius Capital Stock in excess of the number issuable at the Initial Conversion Ratio upon conversion of the existing Founder Shares held it in connection with the Closing as a result of any Adjustment. 

	3.	 Excess Artius Transaction Expenses. If the Artius Transaction Expenses (as finally determined in
accordance with the procedures set forth in Section 2.2(a) of the Merger Agreement) exceed the Artius Transaction Expense Cap, then on the Closing Date the Sponsor shall pay or cause to be paid the full amount of such
excess (if any) to the Company by wire transfer of immediately available funds to an account designated in writing by the Company. 

  

	4.	 Transfers. The Sponsor will abide by the lock-up provisions
contained in Section 7 of the Letter Agreement, dated as of July 13, 2020, by and among Artius, the Sponsor and certain Insiders (as defined therein) signatory thereto during the period commencing on the date hereof and ending on the
earlier to occur of (a) the Effective Time, and (b) such date and time as the Merger Agreement shall be terminated in accordance with Section 7.1 of the Merger Agreement. Any Person to whom the Sponsor Transfers any Founder Shares in
accordance with Section 7 of the Letter Agreement prior to the Effective Time shall become a party to the Lock-Up Agreement as a condition to any such Transfer. Any attempted Transfer of Founder Shares or any interest therein in violation of this
paragraph 4 shall be null and void. 

  

	5.	 Definitions. As used herein, the following terms shall have the respective meanings set forth below:

  

	 	a)	 “Artius Sale” shall mean the occurrence of any of the following events: (i) any Person or
any group of Persons acting together which would constitute a “group” for purposes of Section 13(d) of the Exchange Act or any successor provisions thereto is or becomes the beneficial owner, directly or indirectly, of securities of
Artius representing more than 50% of the combined voting power of Artius’ then outstanding voting securities, (ii) there is consummated a merger or consolidation of Artius with any other corporation or other entity, and, immediately after
the consummation of such merger or consolidation, either (A) the board of directors of Artius immediately prior to the merger or consolidation does not constitute at least a majority of the board of directors of the company surviving the merger
or, if the surviving company is a Subsidiary, the ultimate parent thereof, or (B) the voting securities of Artius immediately prior to such merger or consolidation do not continue to represent or are not converted into more than 50% of the
combined voting power of the then outstanding voting securities of the Person resulting from such merger or consolidation or, if the surviving company is a Subsidiary, the ultimate parent thereof, (iii) there is consummated an agreement or
series of related agreements for the sale, lease or other disposition, directly or indirectly, by Artius of all or substantially all of the assets of Artius and its Subsidiaries, taken as a whole, other than such sale or other disposition by Artius
of all or substantially all of the assets of Artius and its Subsidiaries, taken as a whole, to an entity at least 50% of the combined voting power of the voting securities of which are owned by shareholders of Artius in substantially the same
proportions as their ownership of Artius immediately prior to such sale, or (iv) any liquidation, merger, capital stock exchange, reorganization or other similar transaction that results in all of the Artius Stockholders having the right to
exchange their shares of Artius Class A Common Stock for cash, securities or other property. 

  

	 	b)	 “Artius Transaction Expense Cap” has the meaning set forth in Exhibit A.

	 	c)	 “beneficially own,” “beneficial ownership” and “beneficial
owner” shall have the meaning ascribed to such phrase in Section 13(d) of the Exchange Act. 

  

	 	d)	 “Founder Shares” shall mean, prior to the Domestication and the Artius Pre-Closing Conversion, the Artius Class B Ordinary Shares owned by the Sponsor, and following the Domestication and the Artius Pre-Closing Conversion, the shares of
Artius Class A Common Stock owned by the Sponsor. 

  

	 	e)	 “Transfer” shall mean the (i) sale or assignment of, offer to sell, contract or agreement
to sell, hypothecate, pledge, grant of any option to purchase or otherwise dispose of or agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call
equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended and the rules and regulations of the SEC promulgated thereunder with respect to, any security, (ii) entry into any swap or other
arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any security, whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) public
announcement of any intention to effect any transaction specified in clause (i) or (ii). 

 Miscellaneous 

 

	6.	 Entire Agreement; Amendment. This Agreement contains the entire agreement and understanding among the
parties hereto with respect to the subject matter hereof and supersedes all prior and contemporaneous agreements, understandings and discussions, whether written or oral, relating to such subject matter in any way. The parties hereto have
voluntarily agreed to define their rights and Liabilities with respect to the transactions contemplated hereby exclusively pursuant to the express terms and provisions of this Agreement, and the parties disclaim that they are owed any duties or are
entitled to any remedies not set forth in this Agreement. No amendment of any provision of this Agreement shall be valid unless the same shall be in writing and signed by the parties hereto and, prior to the Closing, the Company.

  

	7.	 Assignment. This Agreement and all of the provisions hereof shall be binding upon and inure to
the benefit of the parties and their respective successors and assigns; provided that neither this Agreement nor any of the rights, interests or obligations hereunder may be assigned or delegated by any party (including by operation of Law)
without the prior written consent of the other party and, prior to the Closing, the Company. Any purported assignment or delegation not permitted under this paragraph shall be null and void. 

 

	8.	 Governing Law. This Letter Agreement shall be governed by and construed and enforced in accordance with
the laws of the State of Delaware, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The parties hereto (i) all agree that any action, proceeding, claim or
dispute arising out of, or relating in any way to, this Letter Agreement shall be brought and enforced in the Court of Chancery of the State of Delaware (or if such court declines jurisdiction then in any court of

	 	
the State of Delaware or the Federal District Court for the District of Delaware) and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and
(ii) waive any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum. 

  

	9.	 Notices. All notices, demands and other communications to be given or delivered under this Agreement
shall be in writing and shall be deemed to have been given (a) when personally delivered (or, if delivery is refused, upon presentment) or received by email prior to 6:00 p.m. eastern time on a Business Day and, if otherwise, on the next
Business Day, (b) one (1) Business Day following sending by reputable overnight express courier (charges prepaid) or (c) three (3) days following mailing by certified or registered mail, postage prepaid and return receipt requested.

  

	10.	 Termination. This Letter Agreement shall terminate on the earlier of (i) the vesting in full and
delivery of all Sponsor Vesting Shares, (ii) immediately following the liquidation of Artius or (iii) the termination of the Merger Agreement in accordance with its terms. No such termination shall relieve the Sponsor or Artius from any
liability resulting from a breach of this Letter Agreement occurring prior to such termination. 

  

	11.	 Equitable Adjustments. If, and as often as, there are any changes in Artius, the Founder Shares or the
Artius Capital Stock by way of stock split, stock dividend, combination or reclassification, or through merger, consolidation, reorganization, recapitalization or business combination, or by any other means, equitable adjustment shall be made to the
provisions of this Letter Agreement as may be required so that the rights, privileges, duties and obligations hereunder shall continue with respect to Artius, Artius’ successor or the surviving entity of such transaction, the Founder Shares or
Artius Capital Stock, each as so changed. For the avoidance of doubt, such equitable adjustment shall be made to the applicable Stock Price Levels set forth in paragraph 2. 

 

	12.	 Specific Performance. The Sponsor acknowledges that its obligations under this Letter Agreement are
unique, recognizes and affirms that in the event of a breach of this Letter Agreement by the Sponsor, money damages will be inadequate and Artius will have no adequate remedy at law, and agrees that irreparable damage would occur in the event that
any of the provisions of this Letter Agreement were not performed by the Sponsor in accordance with their specific terms or were otherwise breached. Accordingly, Artius shall be entitled to an injunction or restraining order to prevent breaches of
this Letter Agreement by the Sponsor and to enforce specifically the terms and provisions hereof, without the requirement to post any bond or other security or to prove that money damages would be inadequate, this being in addition to any other
right or remedy to which such party may be entitled under this Letter Agreement, at law or in equity. 

  

	13.	 Third Party Beneficiary – The Company shall be a third party beneficiary of the agreements made
hereunder between Artius and the Sponsor and shall have the right to enforce such agreements directly to the extent it deems such enforcement necessary or advisable to protect its rights hereunder. 

[Signatures Follow] 

 
			
	Sincerely,
	
	SPONSOR:
	
	ARTIUS ACQUISITION PARTNERS LLC
		
	By:	 	          

		 	Name: [●]
		 	Title: [●]

  

			
	Acknowledged and Agreed:
	
	ARTIUS:
	
	ARTIUS ACQUISITION INC.
		
	By:	 	          

		 	Name: [●]
		 	Title: [●]

 Exhibit A 

Artius Transaction Expense Cap 

“Artius Transaction Expense Cap” shall equal the sum of the following: 

 

	 	1.	 $38,000,000; 

  

	 	2.	 any fees, costs and expenses incurred or payable by Artius, the Acquired Companies or the Sponsor, in
connection with entry into the Subscription Agreements and the consummation of the transactions contemplated by the Subscription Agreements and in connection with the negotiation, preparation and execution of the PIPE Investment, including any
commitment or other fees or other inducements related thereto; 

  

	 	3.	 Financial printer expenses; 

 

	 	4.	 Proxy solicitation expenses; 

 

	 	5.	 all fees, costs and expenses paid or payable pursuant to the Tail Policy; 

 

	 	6.	 Transfer Taxes; 

  

	 	7.	 all filing fees paid or payable to a Governmental Entity in connection with any filing made under the Antitrust
Laws; and 

  

	 	8.	 fees associated with the Parties’ retention of an executive search firm to assist with recruiting the 3
independent directors for the Artius Board.EX-10.3

 Exhibit 10.3 

STOCKHOLDER SUPPORT AGREEMENT 

This STOCKHOLDER SUPPORT AGREEMENT (this “Agreement”) is dated as of February 16, 2021, by and among Artius Acquisition
Inc., a Cayman Islands exempted company (“Artius”), the Persons set forth on Schedule I hereto (each, a “Stockholder” and, collectively, the “Stockholders”), and Micromidas, Inc., a Delaware
corporation (the “Company”). Capitalized terms used but not defined herein shall have the respective meanings ascribed to such terms in the Merger Agreement (as defined below). 

RECITALS 
 WHEREAS, on
February 16, 2021, Artius, Zero Carbon Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of Artius (“Merger Sub”), and the Company entered into an Agreement and Plan of Merger and Reorganization (as amended or
modified from time to time, the “Merger Agreement”), pursuant to which, among other transactions, upon the terms and subject to the conditions thereof, Merger Sub will be merged with and into the Company (the
“Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Artius, and each Company Share issued and outstanding as of immediately prior to the Effective Time will, in each case, be cancelled and automatically
converted into the right to receive a certain number of shares of Artius Class A Common Stock as described in the Merger Agreement (such transaction, the Merger and the other transactions contemplated by the Merger Agreement, the
“Transactions”); 
 WHEREAS, as of the date hereof, the Stockholders are the holders of record and “beneficial
owners” (within the meaning of Rule 13d-3 of the Exchange Act) of, and have sole voting power over, such number of Company Shares as are indicated opposite each of their names on Schedule I
attached hereto (all such Company Shares, together with any Company Shares of which ownership of record or the power to vote (including, without limitation, by proxy or power of attorney) is hereafter acquired by any such Stockholder during the
period from the date hereof through the Expiration Time (as defined below), including by purchase, as a result of a stock dividend, stock split, recapitalization, combination, reclassification, exchange or change of such shares, or upon exercise or
conversion of any securities, are referred to herein as the “Subject Shares”); 
 WHEREAS, the Company and the Stockholders
hereby agree to terminate, effective as of the Effective Time, each agreement by and among the Company and the Company Stockholders parties thereto as set forth on Schedule IV hereto (the “Investment Agreements”); and 

WHEREAS, as an inducement to Artius and the Company to enter into the Merger Agreement and to consummate the Transactions, the parties hereto
desire to agree to certain matters as set forth herein. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and of the mutual covenants and agreements contained herein, and intending to be legally
bound hereby, the parties hereto hereby agree as follows: 

 ARTICLE 1 

STOCKHOLDER SUPPORT AGREEMENT; COVENANTS 

1.1 Binding Effect of the Merger Agreement. Each Stockholder hereby acknowledges that it has read the Merger Agreement and this
Agreement and has had the opportunity to consult with its tax and legal advisors. Each Stockholder shall be bound by and comply with Section 6.8 (Communications; Press Releases) of the Merger Agreement (and any relevant definitions
contained in such Section) as if (a) such Stockholder was an original signatory to the Merger Agreement with respect to such provision, and (b) each reference to the Company contained in Section 6.8 of the Merger
Agreement (other than the first clause of the first sentence of Section 6.8) also referred to each such Stockholder. 

1.2 Transfer of Shares. During the period commencing on the date hereof and ending on the earlier to occur of (a) the Effective
Time, and (b) such date and time as the Merger Agreement shall be terminated in accordance with Section 7.1 of the Merger Agreement (the “Expiration Time”), each Stockholder, severally and not jointly, agrees that it shall
not (i) sell, assign, offer, exchange, transfer (including by operation of law), pledge, dispose of, permit to exist any material lien with respect to, or otherwise encumber any of the Subject Shares or otherwise agree or commit to do any of
the foregoing, except for a sale, assignment or transfer pursuant to the Merger Agreement or to another stockholder of the Company that is a party to this Agreement and bound by the terms and obligations hereof, (ii) deposit any Subject Shares
into a voting trust or enter into a voting agreement or arrangement or grant any proxy or power of attorney with respect thereto that is inconsistent with this Agreement, or (iii) enter into any contract, option or other arrangement or
undertaking with respect to the direct or indirect acquisition or sale, assignment, transfer (including by operation of law) or other disposition of any Subject Shares; provided, that the foregoing shall not prohibit the transfer of the
Subject Shares (A) if Stockholder is an individual (1) to any member of such Stockholder’s immediate family, or to a trust for the benefit of Stockholder or any member of Stockholder’s immediate family, the sole trustees of which
are such Stockholder or any member of such Stockholder’s immediate family or (2) by will, other testamentary document, under the laws of intestacy or by virtue of laws of descent and distribution upon the death of Stockholder; or
(B) if Stockholder is an entity, to a partner, member, or affiliate of Stockholder, but only if, in the case of clause (A) and (B), such transferee shall concurrently execute this Agreement or a joinder agreeing to become a party to this
Agreement. Any attempted transfer of Subject Shares or any interest therein in violation of this Section 1.2 shall be null and void. 

1.3 New Shares. In the event that, during the period commencing on the date hereof and ending at the Expiration Time, (a) any
Subject Shares are issued to a Stockholder after the date of this Agreement pursuant to any stock dividend, stock split, recapitalization, reclassification, combination or exchange of Subject Shares or otherwise, (b) a Stockholder purchases or
otherwise acquires beneficial ownership of any Subject Shares or (c) a Stockholder acquires the right to vote or share in the voting of any Subject Shares (collectively the “New Securities”), then such New Securities acquired
or purchased by such Stockholder shall be subject to the terms of this Agreement to the same extent as if they constituted the Subject Shares owned by such Stockholder as of the date hereof. 

 1.4 Agreement to Vote. During the period commencing on the date hereof until the
Expiration Time, each Stockholder, with respect to its, his or her Subject Shares, severally and not jointly, unconditionally and irrevocably agrees that, at any meeting of the stockholders of the Company (or any adjournment or postponement
thereof), and in any action by written consent of the stockholders of the Company requested by the Company Board (which written consent shall be delivered promptly, and in any event within one Business Day, after (x) the Registration Statement
has been declared effective, and (y) the Company requests such delivery), such Stockholder shall, if a meeting is held, appear at the meeting, in person or by proxy, or otherwise cause its, his or her Subject Shares to be counted as present
thereat for purposes of establishing a quorum, and such Stockholder shall vote or provide consent (or cause to be voted or consented), in person or by proxy, all of its, his or her Subject Shares: 

(a) to approve and adopt the Merger Agreement and the Transactions; 

(b) in any other circumstances upon which a consent or other approval is required under the Company Governing Documents or otherwise sought
with respect to, or in connection with, the Merger Agreement or the Transactions, to vote, consent or approve (or cause to be voted, consented or approved) all of such Stockholder’s Subject Shares held at such time in favor thereof; and 

(c) against any Competing Transaction or any proposal, action or agreement that would impede, frustrate, prevent or nullify any provision of
this Agreement, the Merger Agreement or the Merger. 
 Each Stockholder hereby agrees that it shall not commit or agree to take any action
inconsistent with the foregoing. Notwithstanding the foregoing, such Stockholder shall not vote or provide consent with respect to any of its, his or her Subject Shares to the extent Stockholder is not a director, officer or affiliate of the Company
or holder of Subject Shares representing greater than 5% of the outstanding shares of capital stock of the Company, or take any other action, in each case to the extent any such vote, consent or other action would preclude Artius from filing with
the SEC the Registration Statement on Form S-4 as contemplated by the Merger Agreement. 
 1.4 No
Challenges. Each Stockholder agrees not to commence, join in, facilitate, assist or encourage, and agrees to take all actions necessary to opt out of any class in any class action with respect to, any claim, derivative or otherwise, against
Artius, Merger Sub, the Company or any of their respective successors or directors (a) challenging the validity of, or seeking to enjoin the operation of, any provision of this Agreement, (b) alleging a breach of any fiduciary duty of any
person in connection with the evaluation, negotiation or entry into the Merger Agreement or (c) otherwise relating to the negotiation, execution or delivery of this Agreement, the Merger Agreement or the consummation of the transactions
contemplated hereby and thereby. 
 1.5 Investment Agreements. Each of the Company and each Stockholder hereby agrees and consents to
the termination of all Investment Agreements to which such Stockholder is party, effective as of the Effective Time, without any further liability or obligation to the Company, the Company’s Subsidiaries, the Stockholders or Artius. Each
Stockholder agrees, confirms, and acknowledges that, after the Effective Time, it, he or she shall not have any of the rights or privileges provided to each such Stockholder in such applicable Investment Agreements. The termination of such
Investment Agreements shall terminate the rights of the parties thereto to enforce any provisions of such agreements that expressly survive the termination of such Investment Agreements. 

 1.6 Investor Rights Agreement. Each of the Stockholders set forth on Schedule
II (and any Person to whom each such Stockholder transfers its Subject Shares) will deliver, substantially simultaneously with the Effective Time, a duly executed copy of the Investor Rights Agreement. 

1.7 Lock-up Agreements. Each of the Stockholders set forth on Schedule III (and any Person to whom each such Stockholder transfers its Subject Shares) will deliver, substantially simultaneously herewith, a duly executed copy of the
Lock-up Agreement effective as of the Effective Time, substantially in the form attached as Exhibit B to the Merger Agreement. 

1.8 Appraisal and Dissenters’ Rights. Each Stockholder hereby irrevocably and unconditionally waives, and agrees not to assert or
perfect, any rights of appraisal or other similar rights to dissent (including any notice requirements related thereto) with respect to the Merger, the Merger Agreement or any of the Transactions that Stockholder may have by virtue of ownership of
Subject Shares (including all rights under Section 262 of the DGCL). 
 1.9 Exclusivity. Unless this Agreement shall have been
terminated in accordance with Section 3.1, each Stockholder, severally and not jointly, agrees not to, and shall not authorize or permit any of its, his or her Related Parties to, directly or indirectly, (a) solicit or
take any action to facilitate or encourage any inquiries or the making, submission or announcement of, any proposal or offer from any Competing Buyer that may constitute, or would reasonably be expected to lead to, a Competing Transaction;
(b) enter into, participate in, continue or otherwise engage in, any discussions or negotiations with any Competing Buyer regarding a Competing Transaction; or (c) furnish (including through the Data Room) any information relating to the
Acquired Companies or any of their assets or businesses, or afford access to the assets, business, properties, books or records of the Acquired Companies to a Competing Buyer, in all cases for the purpose of assisting with or facilitating, or that
would otherwise reasonably be expected to lead to, a Competing Transaction; (d) approve, endorse or recommend any Competing Transaction; or (e) enter into a Competing Transaction or any agreement, arrangement or understanding (including
any letter of intent or term sheet) relating to a Competing Transaction or publicly announce an intention to do so. Each Stockholder shall, and shall cause its, his or her Related Parties to, immediately cease any and all existing discussions or
negotiations with any Person (other than the other party to the Merger Agreement and its Representatives) conducted prior to the date of this Agreement, or which is reasonably likely to give rise to or result in, a Competing Transaction. 

1.10 Consent to Disclosure. To the extent required by law or regulation, each Stockholder hereby consents to the publication and
disclosure in the Registration Statement (and, as and to the extent otherwise required by applicable securities Laws or the SEC or any other securities authorities, any other documents or communications provided by the Company or Artius to any
Governmental Entity or to securityholders of Artius) of such Stockholder’s identity and beneficial ownership of its Subject Shares and the nature of such Stockholder’s commitments, arrangements and understandings under and relating to this
Agreement and, if deemed appropriate 

 
by the Company or Artius, a copy of this Agreement. Each Stockholder will promptly provide any information reasonably requested by the Company or Artius in connection with the first sentence of
this Section 1.10 or as required by the SEC or any regulatory authority for any regulatory application or filing made or approval sought in connection with the Transactions (including filings with the SEC). 

REPRESENTATIONS AND WARRANTIES 

2.1 Representations and Warranties of the Stockholders. Each Stockholder represents and warrants as of the date hereof to Artius and
the Company (solely with respect to itself, himself or herself and not with respect to any other Stockholder) as follows: 
 (a)
Organization; Due Authorization. If such Stockholder is not an individual, it is duly organized, validly existing and in good standing under the Laws of the jurisdiction in which it is incorporated, formed, organized or constituted, and the
execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby are within such Stockholder’s corporate, limited liability company or organizational powers and have been duly authorized by all
necessary corporate, limited liability company or organizational actions on the part of such Stockholder. If such Stockholder is an individual, such Stockholder has full legal capacity, right and authority to execute and deliver this Agreement and
to perform his or her obligations hereunder. This Agreement has been duly executed and delivered by such Stockholder and, assuming due authorization, execution and delivery by the other parties to this Agreement, this Agreement constitutes a legally
valid and binding obligation of such Stockholder, enforceable against such Stockholder in accordance with the terms hereof (except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’ rights and general
principles of equity affecting the availability of specific performance and other equitable remedies). If this Agreement is being executed in a representative or fiduciary capacity, the Person signing this Agreement has full power and authority to
enter into this Agreement on behalf of the applicable Stockholder. 
 (b) Ownership. Such Stockholder is the record and beneficial
owner (as defined in the Securities Act) of, and has good, valid and marketable title to, all of such Stockholder’s Subject Shares, and there exist no Liens or any other limitation or restriction (including any restriction on the right to vote,
sell or otherwise dispose of such Subject Shares) affecting any such Subject Shares, other than Liens pursuant to (i) this Agreement, (ii) the Company Governing Documents, (iii) the Merger Agreement, (iv) the Voting Agreement (as
defined in Schedule IV), or (v) any applicable securities Laws. Such Stockholder’s Subject Shares are the only equity securities in the Company owned of record or beneficially by such Stockholder on the date of this Agreement, and
none of such Stockholder’s Subject Shares are subject to any proxy, voting trust or other agreement or arrangement with respect to the voting of such Subject Shares, except as provided hereunder and under the Voting Agreement. Such Stockholder
has full voting power, full power of disposition and full power to issue instructions with respect to the matters set forth herein, and full power to agree to all of the matters applicable to such Stockholder set forth in this Agreement, in each
case, with respect to such Stockholder’s Subject Shares. Such Stockholder does not hold or own any rights to acquire (directly or indirectly) any equity securities of the Company or any equity securities convertible into, or which can be
exchanged for, equity securities of the Company. Such Stockholder has not granted a proxy or power of attorney with respect to any of the Stockholder’s Subject Shares that is inconsistent with the Stockholder’s obligations pursuant to this
Agreement. 

 (c) No Conflicts. The execution and delivery of this Agreement by such Stockholder
does not, and the performance by such Stockholder of his, her or its obligations hereunder will not, (i) if such Stockholder is not an individual, conflict with or result in a violation of the organizational documents of such Stockholder or
(ii) require any consent, authorization or approval that has not been given or other action that has not been taken by any Person (including under any Contract binding upon such Stockholder or such Stockholder’s Subject Shares), in each
case, to the extent such consent, approval or other action would prevent, enjoin or materially delay the performance by such Stockholder of its, his or her obligations under this Agreement, (iii) conflict with or violate any Law, or
(iv) result in any material breach of or constitute a material default (or an event that with notice or lapse of time or both would become a material default) under, or give to others any rights of termination, amendment, acceleration or
cancellation of, or result in the creation of a Lien on any of the Subject Shares owned by such Stockholder pursuant to any Contract to which such Stockholder is a party or by which such Stockholder is bound. 

(d) Litigation. There are no Proceedings pending against such Stockholder, or to the knowledge of such Stockholder threatened against
such Stockholder, before (or, in the case of threatened Proceedings, that would be before) any arbitrator or any Governmental Entity, which in any manner challenges or seeks to prevent, enjoin or materially delay the performance by such Stockholder
of its, his or her obligations under this Agreement. 
 (e) Adequate Information. Such Stockholder is a sophisticated stockholder and
has adequate information concerning the business and financial condition of Artius and the Company to make an informed decision regarding this Agreement and the transactions contemplated hereby and has independently and without reliance upon Artius
or the Company and based on such information as such Stockholder has deemed appropriate, made its, his or her own analysis and decision to enter into this Agreement. Such Stockholder acknowledges that Artius and the Company have not made and do not
make any representation or warranty, whether express or implied, of any kind or character except as expressly set forth in this Agreement. Such Stockholder acknowledges that the agreements contained herein with respect to the Subject Shares held by
such Stockholder are irrevocable. 
 (f) Acknowledgment. Such Stockholder understands and acknowledges that each of Artius and the
Company is entering into the Merger Agreement in reliance upon such Stockholder’s execution and delivery of this Agreement. 
 (g)
Brokerage Fees. Other than as set forth on Section 3.14 of the Company Disclosure Letter no broker, finder, investment banker or other Person is entitled to any brokerage fee, finders’ fee or other commission in
connection with the transactions contemplated by the Merger Agreement based upon arrangements made by such Stockholder, for which Artius, the Company or any of their affiliates may become liable following the Closing. 

 ARTICLE 3 

MISCELLANEOUS 
 3.1
Termination. This Agreement and all of its provisions shall automatically terminate upon the earliest of (a) the Expiration Time and (b) as to each Stockholder, the written agreement of Artius, the Company and such Stockholder. Upon
such termination of this Agreement, all obligations of the parties under this Agreement will terminate, without any liability or other obligation on the part of any party hereto to any Person in respect hereof or the transactions contemplated
hereby, and no party hereto shall have any claim against another (and no person shall have any rights against such party), whether under contract, tort or otherwise, with respect to the subject matter hereof; provided, however, that
the termination of this Agreement shall not relieve any party hereto from liability arising in respect of any breach of this Agreement prior to such termination. This Article III shall survive the termination of this Agreement. 

3.2 Governing Law. This Agreement, and all claims or causes of action (whether in contract or tort) that may be based upon, arise out of
or relate to this Agreement or the negotiation, execution or performance of this Agreement (including any claim or cause of action based upon, arising out of or related to any representation or warranty made in or in connection with this Agreement)
will be governed by and construed in accordance with the internal Laws of the State of Delaware applicable to agreements executed and performed entirely within such State, in each case without giving effect to any choice of law or conflict of law
rules or provisions (whether of the State of Delaware or any other jurisdiction) that would cause the application of the Law of any jurisdiction other than the State of Delaware. 

3.3 CONSENT TO JURISDICTION AND SERVICE OF PROCESS; WAIVER OF JURY TRIAL. 

(a) THE PARTIES TO THIS AGREEMENT SUBMIT TO THE EXCLUSIVE JURISDICTION OF THE COURT OF CHANCERY OF THE STATE OF DELAWARE OR IF SUCH COURT
DECLINES JURISDICTION, THEN TO ANY COURT OF THE STATE OF DELAWARE OR THE FEDERAL DISTRICT COURT FOR THE DISTRICT OF DELAWARE IN RESPECT OF THE INTERPRETATION AND ENFORCEMENT OF THE PROVISIONS OF THIS AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE
OR OTHER DOCUMENT DELIVERED IN CONNECTION HEREWITH AND BY THIS AGREEMENT WAIVE, AND AGREE NOT TO ASSERT, ANY DEFENSE IN ANY ACTION FOR THE INTERPRETATION OR ENFORCEMENT OF THIS AGREEMENT AND ANY RELATED AGREEMENT, CERTIFICATE OR OTHER DOCUMENT
DELIVERED IN CONNECTION HEREWITH, THAT THEY ARE NOT SUBJECT THERETO OR THAT SUCH ACTION MAY NOT BE BROUGHT OR IS NOT MAINTAINABLE IN SUCH COURTS OR THAT THIS AGREEMENT MAY NOT BE ENFORCED IN OR BY SUCH COURTS OR THAT THEIR PROPERTY IS EXEMPT OR
IMMUNE FROM EXECUTION, THAT THE ACTION IS BROUGHT IN AN INCONVENIENT FORUM, OR THAT THE VENUE OF THE ACTION IS IMPROPER. SERVICE OF PROCESS WITH RESPECT THERETO MAY BE MADE UPON ANY PARTY TO THIS AGREEMENT BY MAILING A COPY THEREOF BY REGISTERED OR
CERTIFIED MAIL, POSTAGE PREPAID, TO SUCH PARTY AT ITS ADDRESS AS PROVIDED IN SECTION 3.8. 

 (b) WAIVER OF TRIAL BY JURY. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT
ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF
ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS
REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH SUCH
PARTY MAKES THIS WAIVER VOLUNTARILY, AND (IV) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 3.3. 

3.4 Assignment. This Agreement and all of the provisions hereof shall be binding upon and inure to the benefit of the parties and
their respective successors and assigns; provided that neither this Agreement nor any of the rights, interests or obligations hereunder may be assigned or delegated by any party (including by operation of Law) without the prior written
consent of the other parties. Any assignment in violation of this Section 3.4 shall be void. 
 3.5 Specific
Performance. The parties hereto agree that irreparable damage for which monetary damages, even if available, would not be an adequate remedy, would occur in the event that any of the provisions of this Agreement were not performed in accordance
with their specific terms or were otherwise breached. It is accordingly agreed that (i) the parties hereto shall be entitled to seek an injunction or injunctions or other equitable relief to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement, including the Stockholder’s obligations to vote its Subject Shares as provided in this Agreement, without proof of damages, in the chancery court or any other state or federal court
within the State of Delaware, this being in addition to any other remedy to which such party is entitled under this Agreement or otherwise at law or in equity, and (ii) the right of specific performance is an integral part of the transactions
contemplated by this Agreement and without that right, none of the parties would have entered into this Agreement. Each party agrees that it will not oppose the granting of specific performance and other equitable relief on the basis that the other
parties have an adequate remedy at Law or that an award of specific performance is not an appropriate remedy for any reason at Law or equity. The parties acknowledge and agree that any party seeking an injunction to prevent breaches of this
Agreement and to enforce specifically the terms and provisions of this Agreement in accordance with this Section 3.5 shall not be required to provide any bond or other security in connection with any such injunction or to
prove the inadequacy of money damages as a remedy. 
 3.6 Amendment; Waiver. This Agreement may not be amended, changed, supplemented,
waived or otherwise modified or terminated, except upon the execution and delivery of a written agreement executed by Artius, the Company and the Stockholders. 

 3.7 Severability. Whenever possible, each provision of this Agreement shall be
interpreted in such manner as to be effective and valid under applicable Law, but if any provision of this Agreement or the application of any such provision to any Person or circumstance shall be held to be prohibited by or invalid, illegal or
unenforceable under applicable Law in any respect by a court of competent jurisdiction, such provision shall be ineffective only to the extent of such prohibition or invalidity, illegality or unenforceability, without invalidating the remainder of
such provision or the remaining provisions of this Agreement. 
 3.8 Notices. All notices, demands and other communications to be
given or delivered under this Agreement shall be in writing and shall be deemed to have been given (a) when personally delivered (or, if delivery is refused, upon presentment) or received by email prior to 6:00 p.m. eastern time on a Business
Day and, if otherwise, on the next Business Day, (b) one (1) Business Day following sending by reputable overnight express courier (charges prepaid) or (c) three (3) days following mailing by certified or registered mail, postage prepaid
and return receipt requested. Unless another address is specified in writing pursuant to the provisions of this paragraph, notices, demands and other communications to the parties shall be sent to the addresses indicated below: 

If to Artius: 
 Artius
Acquisition Inc. 
 3 Columbus Circle, Suite 2215 

New York, NY 10019 
 Attention: H.
Boon Sim 
 Email: boon@artiuscapital.com 

with a copy (which shall not constitute notice) to: 

Cleary Gottlieb Steen & Hamilton 

One Liberty Plaza 
 New York NY
10006 
 Attention: Paul J. Shim 

  Adam Brenneman 

E-mail: pshim@cgsh.com 

         abrenneman@cgsh.com 

If to the Company: 

Micromidas, Inc. 
 930 Riverside
Parkway, Suite 10 
 West Sacramento, CA 95605 

Attention: John Bissell 

        Rich Riley 

E-mail: legal@originmaterials.com 

 with a copy (which shall not constitute notice) to: 

Cooley LLP 
 3175 Hanover Street

 Palo Alto, CA 94304 

Attention: Peter Werner 

                 Garth Osterman 

E-mail: pwerner@cooley.com 

             gosterman@cooley.com 

If to a Stockholder: 
 To
such Stockholder’s address set forth in Schedule I. 
 3.9 Further Assurances. Each Stockholder shall execute and deliver,
or cause to be delivered, such additional documents, and take, or cause to be taken, all such further actions and do, or cause to be done, all things reasonably necessary (including under applicable Laws), or reasonably requested by Artius or the
Company, to effect the actions and consummate the Merger and the other transactions contemplated by this Agreement and the Merger Agreement (including the Transactions), in each case, on the terms and subject to the conditions set forth therein and
herein, as applicable. 
 3.10 Counterparts. This Agreement may be executed in two or more counterparts (any of which may be delivered
by electronic transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument. 

3.11 Entire Agreement. This Agreement and the agreements referenced herein constitute the entire agreement and understanding of the
parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by or among the parties hereto to the extent they relate in any way to the subject matter hereof. 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	ARTIUS ACQUISITION INC.
		
	By:	 	
                     
                    

	Name:
	Title:

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	MICROMIDAS, INC.
		
	By:	 	
                     
    

	Name:
	Title:

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	  

	[Stockholder]

 
			
		
	Address:	 	  

		
		 	  

	Email:	 	  

 SCHEDULE I 

Stockholder Subject Shares 

 SCHEDULE II 

Investor Rights Agreement Signatories 

 SCHEDULE III 

Lock-up Agreement Signatories 

 SCHEDULE IV 

Investment Agreements

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