Document:

EX-10.8

 Exhibit 10.8 

Black Spade Acquisition Co 

Suite 2902, 29/F The Centrium 
 60
Wyndham Street 
 Central, Hong Kong 

, 2021 
 Ladies and Gentlemen: 

This letter will confirm our agreement that, commencing on the effective date (the “Effective Date”) of the registration statement
(the “Registration Statement”) for the initial public offering (the “IPO”) of the securities of Black Spade Acquisition Co (the “Company”) and continuing until the earlier of
(i) the consummation by the Company of an initial business combination; or (ii) the Company’s liquidation (in each case as described in the Registration Statement) (such earlier date hereinafter referred to as the
“Termination Date”), Black Spade Sponsor LLC (the “Sponsor”) and/or its affiliates shall make available to the Company certain office space, utilities, secretarial and administrative support services
as may be required by the Company from time to time, at Suite 2902, 29/F The Centrium, 60 Wyndham Street, Central, Hong Kong in exchange for an aggregate monthly fee of up to $10,000. The Sponsor hereby agrees that it does not have any right, title,
interest or claim of any kind in or to any monies that may be set aside in a trust account (the “Trust Account”) that may be established upon the consummation of the IPO and will not seek recourse against the Trust Account
for any reason whatsoever. 
 This Agreement constitutes the entire agreement and understanding of the parties hereto in respect of its subject matter and
supersedes all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. 

This Agreement may be executed in two or more counterparts, each of which shall be deemed an original and all of which together shall constitute one
instrument. Delivery of this Agreement by one party to the other may be made by facsimile, electronic mail (including any electronic signature complying with the New York Electronic Signatures and Records Act (N.Y. State Tech. §§ 301-309), as amended from time to time, or other applicable law) or other transmission method, and the parties hereto agree that any counterpart so delivered shall be deemed to have been duly and validly delivered
and be valid and effective for all purposes. 
 This agreement may not be amended, modified or waived as to any particular provision, except by a written
instrument executed by the parties hereto. 
 No party hereto may assign this agreement or any rights, interests or contracted obligations hereunder without
the prior written approval of the other party. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. 

This agreement shall be governed by, construed in accordance with, and interpreted pursuant to the laws of the State of New York, without giving effect to its
choice of law principles. 

  

			
	 Very truly yours,
  

	 Black Spade Acquisition Co

 

	 By:
	 	  

		 	 Name:

		 	 Title:

 [Signature page to Administrative Services Agreement] 

 AGREED TO AND ACCEPTED BY: 
  

			
	 Black Spade Sponsor LLC

 

	 By:
	 	  

		 	 Name:

		 	 Title:

 [Signature page to Administrative Services Agreement]EX-10.1

 Exhibit 10.1 

FORM OF BACKSTOP SUBSCRIPTION AGREEMENT 

This SUBSCRIPTION AGREEMENT (this “Backstop Subscription Agreement”) is entered into on June 23, 2021, by and between
Artius Acquisition, Inc. (the “Company”), a Cayman Islands exempted company, which shall be domesticated as a Delaware corporation prior to the closing of the Transaction (as defined herein), and the undersigned subscriber
(“Subscriber”). 
 WHEREAS, on February 16, 2021, the Company entered into an Agreement and Plan of Merger and
Reorganization with Micromidas, Inc., a Delaware corporation (“Micromidas”), and Zero Carbon Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of the Company (“Merger Sub”) (as may be amended or
supplemented from time to time, the “Transaction Agreement,” and the transactions contemplated by the Transaction Agreement, the “Transaction”); 

WHEREAS, prior to the closing of the Transaction, the Company will be domesticated as a Delaware corporation in accordance with
Section 388 of the General Corporation Law of the State of Delaware and deregister as a Cayman Islands exempted company in accordance with Section 206 of the Cayman Islands Companies Law (2020 Revision) (the
“Domestication”); 
 WHEREAS, in connection with the Transaction, Subscriber desires to subscribe for and purchase from the
Company, following the Domestication and immediately prior to the consummation of the Transaction, that number of shares of the Company’s Class A common stock, par value $0.0001 per share (the “Shares”), set forth on the
signature page hereto (the “Subscribed Shares”) for a purchase price of $10.00 per share (the “Per Share Price” and the aggregate of such Per Share Price for all Subscribed Shares being referred to herein as the
“Purchase Price”); and 
 NOW, THEREFORE, in consideration of the foregoing and the mutual representations, warranties and
covenants, and subject to the conditions, herein contained, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 

Section 1 Subscription. Subject to the terms and conditions hereof, at the Closing (as defined below), Subscriber hereby
agrees to subscribe for and purchase, and the Company hereby agrees to issue and sell to Subscriber, upon the payment of the Purchase Price, the Subscribed Shares (such subscription and issuance, the “Subscription”). Subscriber
acknowledges and agrees that, as a result of the Domestication, the Shares that will be purchased by Subscriber and issued by the Company pursuant hereto shall be shares of common stock in a Delaware corporation (and not, for the avoidance of doubt,
ordinary shares in a Cayman Islands exempted company). 
 Section 2 Closing. 

(a) The consummation of the Subscription contemplated hereby (the “Closing”) shall occur on the closing date of the
Transaction (the “Closing Date”), immediately prior to or substantially concurrently with the consummation of the Transaction. 

(b) No later than one (1) Business Day before the anticipated Closing Date, the Company shall deliver written notice to Subscriber (the
“Closing Notice”) specifying (i) the anticipated Closing Date and (ii) the wire instructions for delivery of the Purchase Price to the Company. On the Closing Date, Subscriber shall deliver the Purchase Price for the
Subscribed Shares by wire transfer of United States dollars in immediately available funds to the account specified by the Company in the Closing Notice. No later than two (2) Business Days prior to the Closing Date, Subscriber shall deliver to
the Company such information as is reasonably required in the Closing Notice in order for the Company to issue the Subscribed Shares to Subscriber, including, without limitation, the legal name of the person in whose name the Subscribed Shares are
to be issued and a duly completed and executed Internal Revenue Service Form W-9 or appropriate Form W-8. Upon satisfaction (or, if applicable, waiver) of the conditions
set forth in this Section 2, the Company shall deliver to Subscriber at the Closing, (i) the Subscribed Shares in book entry form, free and clear of any liens or other restrictions (other than those arising under this
Backstop Subscription Agreement or applicable securities laws), in the name of Subscriber (or its nominee in accordance with its delivery instructions), and (ii) evidence from the Company’s transfer agent of the issuance to Subscriber of
the Subscribed Shares on and as of the Closing Date. In the event that the consummation of the Transaction does not occur within five (5) Business Days after the anticipated Closing Date specified in the Closing Notice, unless otherwise agreed
to in writing by the 

 
Company and Subscriber, the Company shall promptly (but in no event later than seven (7) Business Days after the anticipated Closing Date specified in the Closing Notice) return the funds so
delivered by Subscriber to the Company by wire transfer in immediately available funds to the account specified by Subscriber, and any book entries shall be deemed cancelled. Notwithstanding such return or cancellation (x) a failure to close on
the anticipated Closing Date shall not, by itself, be deemed to be a failure of any of the conditions to Closing set forth in this Section 2 to be satisfied or waived on or prior to the Closing Date, and (y) unless and
until this Backstop Subscription Agreement is terminated in accordance with Section 7 herein, Subscriber shall remain obligated (A) to redeliver funds to the Company in escrow following the Company’s delivery to
Subscriber of a new Closing Notice and (B) to consummate the Closing upon satisfaction of the conditions set forth in this Section 2. For the purposes of this Backstop Subscription Agreement, “Business
Day” means any day other than a Saturday, Sunday or any other day on which commercial banks are required or authorized to close in the State of New York. 

(c) The Closing shall be subject to the satisfaction, or valid waiver by each of the parties hereto, of the conditions that, on the Closing
Date: 
  

	 	(i)	 no suspension of the qualification of the Subscribed Shares for offering or sale or trading in any
jurisdiction, or initiation or threatening of any proceedings for any of such purposes, shall have occurred; 

  

	 	(ii)	 all conditions precedent to the closing of the Transaction set forth in the Transaction Agreement, including
all necessary approvals of the Company’s stockholders, and regulatory approvals, if any, shall have been satisfied (as determined by the parties to the Transaction Agreement) or waived (other than those conditions which, by their nature, are to
be satisfied at the closing of the Transaction pursuant to the Transaction Agreement), and the closing of the Transaction shall occur on the Closing Date substantially concurrently with or immediately following the Closing; and

  

	 	(iii)	 no governmental authority shall have enacted, issued, promulgated, enforced or entered any judgment, order,
law, rule or regulation which is then in effect and has the effect of making the consummation of the transactions contemplated hereby illegal or otherwise restraining or prohibiting consummation of the transactions contemplated hereby and no such
governmental authority shall have instituted or threatened in writing a proceeding seeking to impose any such restriction or prohibition. 

(d) The obligation of the Company to consummate the Closing shall be subject to the satisfaction or valid waiver by the Company of the
additional conditions that, on the Closing Date: 
  

	 	(i)	 all representations and warranties of Subscriber contained in this Backstop Subscription Agreement shall be
true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Subscriber Material Adverse Effect (as defined below), which representations and warranties shall be true and correct in all
respects) at and as of the Closing Date (except for representations and warranties made as of a specific date, which shall be true and correct in all material respects (other than representations and warranties that are qualified as to materiality
or Subscriber Material Adverse Effect, which representations and warranties shall be true and correct in all respects) as of such date); and 

  

	 	(ii)	 Subscriber shall have performed, satisfied and complied in all material respects with all covenants, agreements
and conditions required by this Backstop Subscription Agreement to be performed, satisfied or complied with by it at or prior to the Closing. 

(e) The obligation of Subscriber to consummate the Closing shall be subject to the satisfaction or valid waiver by Subscriber of the additional
conditions that, on the Closing Date: 
  

	 	(i)	 all representations and warranties of the Company contained in this Backstop Subscription Agreement shall be
true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Company Material Adverse Effect (as defined 

  
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below), which representations and warranties shall be true and correct in all respects) at and as of the Closing Date (except for representations and warranties made as of a specific date, which
shall be true and correct in all material respects (other than representations and warranties that are qualified as to materiality or Company Material Adverse Effect, which representations and warranties shall be true and correct in all respects) as
of such date); 

  

	 	(ii)	 the Company shall have performed, satisfied and complied in all material respects with all covenants,
agreements and conditions required by this Backstop Subscription Agreement to be performed, satisfied or complied with by it at or prior to the Closing; and 

  

	 	(iii)	 no amendment, waiver, or modification of the Transaction Agreement (as the same exists on the date hereof as
provided to Subscriber) shall have occurred that materially and adversely affects Subscriber’s economic benefits under this Backstop Subscription Agreement. 

Section 3 Company Representations and Warranties. The Company represents and warrants to Subscriber that: 

(a) The Company (i) is or will be, as applicable, duly organized, validly existing and in good standing under the laws of the Cayman
Islands as of the date hereof and the State of Delaware as of the Closing Date, (ii) has the requisite power and authority to own, lease and operate its properties, to carry on its business as it is now being conducted and to enter into,
deliver and perform its obligations under this Backstop Subscription Agreement, and (iii) is duly licensed or qualified to conduct its business and, if applicable, is in good standing under the laws of each jurisdiction (other than its
jurisdiction of incorporation) in which the conduct of its business or the ownership of its properties or assets requires such license or qualification, except, with respect to the foregoing clause (iii), where the failure to be in good
standing would not reasonably be expected to have a Company Material Adverse Effect. For purposes of this Backstop Subscription Agreement, a “Company Material Adverse Effect” means an event, change, development, occurrence,
condition or effect with respect to the Company and its subsidiaries, taken together as a whole (on a consolidated basis), that, individually or in the aggregate, would reasonably be expected to have a material adverse effect on the business,
financial condition, stockholders equity or results of operations of the Company and its subsidiaries, taken together as a whole (on a consolidated basis) or on the Company’s ability to consummate the transactions contemplated hereby, including
the issuance and sale of the Subscribed Shares. 
 (b) As of the Closing Date, the Subscribed Shares will be duly authorized and, when issued
and delivered to Subscriber against full payment therefor in accordance with the terms of this Backstop Subscription Agreement, will be validly issued, fully paid and non-assessable and will not have been
issued in violation of any preemptive rights created under the Company’s organizational documents (as adopted on or prior to the Closing Date) or the laws of its jurisdiction of incorporation. 

(c) This Backstop Subscription Agreement has been duly authorized, executed and delivered by the Company, and assuming the due authorization,
execution and delivery of the same by Subscriber, this Backstop Subscription Agreement shall constitute the valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms, except as such
enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium and similar laws affecting creditors generally and by the availability of equitable remedies. 

(d) Assuming the accuracy of the representations and warranties of Subscriber, the execution and delivery of this Backstop Subscription
Agreement, the issuance and sale of the Subscribed Shares and the compliance by the Company with the provisions of this Backstop Subscription Agreement and the consummation of the transactions contemplated herein will not conflict with or result in
a breach or violation of any of the terms or provisions of, or constitute a default under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of the Company pursuant to the terms of
(i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement or instrument to which the Company is a party or by which the Company is bound or to which any of the property or assets of the Company is subject;
(ii) the organizational documents of the Company; or (iii) any statute or any judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over the Company or any of its
properties that, in the case of clauses (i) and (iii), would reasonably be expected to have a Company Material Adverse Effect. 

  
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 (e) The Company is not in default or violation (and no event has occurred which, with notice
or the lapse of time or both, would constitute a default or violation) of any term, condition or provision of (i) the organizational documents of the Company, (ii) any loan or credit agreement, guarantee, note, bond, mortgage, indenture,
lease or other agreement, permit, franchise or license to which, as of the date of this Backstop Subscription Agreement, the Company is a party or by which the Company’s properties or assets are bound or (iii) any statute or any judgment,
order, rule or regulation of any court or governmental agency, taxing authority or regulatory body, domestic or foreign, having jurisdiction over the Company or any of its properties, except, in the case of clauses (ii) and (iii), for defaults
or violations that have not had and would not be reasonably likely to have, individually or in the aggregate, a Company Material Adverse Effect. 

(f) Assuming the accuracy of the representations and warranties of Subscriber, the Company is not required to obtain any consent, waiver,
authorization or order of, give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority, self-regulatory organization (including Nasdaq Capital Market (the “Stock
Exchange”)) or other person in connection with the execution, delivery and performance of this Backstop Subscription Agreement (including, without limitation, the issuance of the Subscribed Shares), other than (i) filings required by
applicable state securities laws, (ii) the filing of the Registration Statement pursuant to Section 5 below, (iii) the filing of a Notice of Exempt Offering of Securities on Form D with the United States
Securities and Exchange Commission (“Commission”) under Regulation D of the Securities Act of 1933, as amended (the “Securities Act”), if applicable, (iv) those required by the Stock Exchange, including with
respect to obtaining stockholder approval, (v) those required to consummate the Transaction as provided under the Transaction Agreement, (vi) the filing of notification under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, if
applicable, and (vii) the failure of which to obtain would not be reasonably likely to have a Company Material Adverse Effect. 
 (g)
As of their respective dates, all reports, statements, schedules, prospectuses or registration statements (collectively, the “SEC Reports”) required to be filed by the Company with the Commission complied in all material respects
with the applicable requirements of the Securities Act and/or the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations of the Commission promulgated thereunder, and none of the SEC Reports,
when filed, contained any untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not
misleading. The financial statements of the Company included in the Form 10—K/A and all subsequently filed SEC Reports comply in all material respects with applicable accounting requirements and the rules and regulations of the Commission with
respect thereto as in effect at the time of filing and fairly present in all material respects the financial position of the Company as of and for the dates thereof and the results of operations and cash flows for the periods then ended, subject, in
the case of unaudited statements, to normal, year-end audit adjustments. A copy of each SEC Report is available to Subscriber via the Commission’s EDGAR system. The Company has timely filed, after giving
effect to any extension period, each report, statement, schedule, prospectus, and registration statement that the Company was required to file with the Commission since its initial registration of the Class A ordinary shares with the
Commission. There are no material outstanding or unresolved comments in comment letters from the staff of the Division of Corporation Finance of the Commission with respect to any of the SEC Reports. For the avoidance of doubt, any correction,
change or restatement of the financial statements of the Company shall not be deemed to be material if (i) the financial statements prior to giving effect to such correction, change or restatement were prepared in accordance with market
practice for special purpose acquisition companies at the time the financial statements were filed or included in an SEC Report and (ii) the correction, change or restatement solely implements guidance or rules that determine that such market
practice did not comply with applicable accounting requirements or the rules and regulation of the Commission with respect thereto. 
 (h)
Except for such matters that would not have a Company Material Adverse Effect, there is no (i) suit, action, proceeding or arbitration before a governmental authority or arbitrator pending, or, to the knowledge of the Company, threatened in
writing against the Company or (ii) judgment, decree, injunction, ruling or order of any governmental authority or arbitrator outstanding against the Company. 

(i) Assuming the accuracy of Subscriber’s representations and warranties set forth in Section 4 of this
Backstop Subscription Agreement, no registration under the Securities Act is required for the offer and sale of the Subscribed Shares by the Company to Subscriber. 

  
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 (j) Neither the Company nor any person acting on its behalf has engaged or will engage in
any form of general solicitation or general advertising (within the meaning of Regulation D) in connection with any offer or sale of the Subscribed Shares or any other action that would reasonably be expected to subject the offering, issuance or
sale of any of the Subscribed Shares to Subscriber pursuant to this Backstop Subscription Agreement to the registration requirements of the Securities Act. 

(k) No broker or finder is entitled to any brokerage or finder’s fee or commission solely in connection with the sale of the Subscribed
Shares to Subscriber. 
 (l) As of the date hereof, the Company’s Class A ordinary shares, as a class, are registered pursuant to
Section 12(b) of the Securities Exchange Act, and are listed for trading on the Stock Exchange under the symbol “AACQ.” There is no suit, action, proceeding or investigation pending or, to the knowledge of the Company, threatened
against the Company by the Stock Exchange or the Commission with respect to any intention by such entity to deregister the Class A ordinary shares or prohibit or terminate the listing of the Class A ordinary shares on the Stock Exchange.
The Company has taken no action that is designed to terminate the registration of the Class A ordinary shares under the Exchange Act. Following the Domestication, the Shares are expected to be registered under the Exchange Act and listed for
trading on the Stock Exchange. 
 (m) As of the date of this Backstop Subscription Agreement and as of immediately prior to the Closing Date
(and without giving effect to the Domestication), the authorized capital stock of the Company consists of (i) 400,000,000 Class A ordinary shares, (ii) 50,000,000 Class B ordinary shares, par value of $0.0001 per share (“Class B
Shares”), and (iii) 1,000,000 preference shares, par value $0.0001 per share (“Preference Shares”). As of the date hereof (i) 72,450,000 Class A ordinary shares are issued and outstanding, (ii) 18,112,500 Class B Shares are
issued and outstanding, (iii) no Preference Shares are issued and outstanding, and (iv) 24,150,000 public warrants and 11,326,667 private placement warrants of the Company are issued and outstanding. All (i) issued and outstanding
Class A ordinary shares and Class B Shares have been duly authorized and validly issued, are fully paid and are non-assessable and are not subject to preemptive rights and (ii) outstanding
warrants have been duly authorized and validly issued and are not subject to preemptive rights. As of the date hereof, other than as disclosed in the Company’s SEC Reports, there are no outstanding options, warrants or other rights to subscribe
for, purchase or acquire from the Company any Class A ordinary shares, Class B Shares or other equity interests in the Company, or securities convertible into or exchangeable or exercisable for such equity interests. As of the date hereof
the Company has no subsidiaries and does not own, directly or indirectly, interests or investments (whether equity or debt) in any person, whether incorporated or unincorporated. There are no stockholder agreements, voting trusts or other agreements
or understandings to which the Company is a party or by which it is bound relating to the voting of any securities of the Company, other than (A) as set forth in the SEC Reports and (B) as contemplated by the Transaction Agreement. Except
as disclosed in the SEC Reports, as of March 31, 2021, the Company had no outstanding indebtedness. 
 Section 4 Subscriber
Representations and Warranties. Subscriber represents and warrants to the Company that: 
 (a) Subscriber (i) is duly
organized, validly existing and in good standing under the laws of its jurisdiction of organization, incorporation or formation, and (ii) has the requisite power and authority to enter into and perform its obligations under this Backstop
Subscription Agreement. 
 (b) This Backstop Subscription Agreement has been duly executed and delivered by Subscriber, and assuming the due
authorization, execution and delivery of the same by the Company, this Backstop Subscription Agreement shall constitute the valid and legally binding obligation of Subscriber, enforceable against Subscriber in accordance with its terms, except as
such enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium and similar laws affecting creditors generally and by the availability of equitable remedies. 

(c) The execution and delivery of this Backstop Subscription Agreement, the purchase of the Subscribed Shares and the compliance by Subscriber
with the provisions of this Backstop Subscription Agreement and the consummation of the transactions contemplated herein will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under,
or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of Subscriber pursuant to the terms of (i) any indenture, mortgage, deed of trust, loan agreement, lease, license or other agreement
or instrument to which Subscriber is a party 

  
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or by which Subscriber is bound or to which any of the property or assets of Subscriber is subject; (ii) the organizational documents of Subscriber; or (iii) any statute or any
judgment, order, rule or regulation of any court or governmental agency or body, domestic or foreign, having jurisdiction over Subscriber or any of its properties that, in the case of clauses (i) and (iii), would reasonably be
expected to have a Subscriber Material Adverse Effect. For purposes of this Backstop Subscription Agreement, a “Subscriber Material Adverse Effect” means an event, change, development, occurrence, condition or effect with respect to
Subscriber that would reasonably be expected to have a material adverse effect on Subscriber’s ability to consummate the transactions contemplated hereby, including the purchase of the Subscribed Shares. 

(d) Subscriber (i) is a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act) or an
“accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (4), (5), (6), (7) or (8) under the Securities Act), in each case, satisfying the applicable requirements set forth on Annex A, (ii) is acquiring the
Subscribed Shares only for its own account and not for the account of others, or if Subscriber is subscribing for the Subscribed Shares as a fiduciary or agent for one or more investor accounts, each owner of such account is a “qualified
institutional buyer” or an “accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (4), (5), (6), (7) or (8)) under the Securities Act), and Subscriber has full investment discretion with respect to each such account,
and the full power and authority to make the acknowledgements, representations and agreements herein on behalf of each owner of each such account, and (iii) is not acquiring the Subscribed Shares with a view to, or for offer or sale in
connection with, any distribution thereof in violation of the Securities Act (and has provided the Company with the requested information on Annex A following the signature page hereto). 

(e) Subscriber understands that the Subscribed Shares are being offered in a transaction not involving any public offering within the meaning
of the Securities Act and that the Subscribed Shares have not been registered under the Securities Act. Subscriber understands that the Subscribed Shares may not be offered, resold, transferred, pledged or otherwise disposed of by Subscriber absent
an effective registration statement under the Securities Act, except (i) to the Company or a subsidiary thereof, or (ii) pursuant to an applicable exemption from the registration requirements of the Securities Act, and, in each of cases
(i) and (ii), in accordance with any applicable securities laws of the applicable states and other jurisdictions of the United States, and that any certificates or book entry records representing the Subscribed Shares shall contain a
restrictive legend to such effect. Subscriber acknowledges and agrees that the Subscribed Shares will be subject to these securities law transfer restrictions and, as a result of these transfer restrictions, Subscriber may not be able to readily
resell the Subscribed Shares and may be required to bear the financial risk of an investment in the Subscribed Shares for an indefinite period of time. Subscriber acknowledges and agrees that the Subscribed Shares will not be eligible for offer,
resale, transfer, pledge or disposition pursuant to Rule 144 promulgated under the Securities Act until at least one year from the filing of “Form 10 information” with the Commission after the Closing Date. Subscriber understands that it
has been advised to consult legal counsel prior to making any offer, resale, pledge or transfer of any of the Subscribed Shares. 
 (f)
Subscriber understands and agrees that Subscriber is purchasing the Subscribed Shares directly from the Company. Subscriber further acknowledges that there have not been, and Subscriber hereby agrees that it is not relying on, any representations,
warranties, covenants or agreements made to Subscriber by the Company, any of its affiliates or any control persons, officers, directors, employees, partners, agents or representatives, any other party to the Transaction or any other person or
entity, expressly or by implication, other than those representations, warranties, covenants and agreements of the Company set forth in this Backstop Subscription Agreement. Subscriber acknowledges that certain information provided by the Company
was based on projections, and such projections were prepared based on assumptions and estimates that are inherently uncertain and are subject to a wide variety of significant business, economic and competitive risks and uncertainties that could
cause actual results to differ materially from those contained in the projections. 
 (g) In making its decision to purchase the Subscribed
Shares, Subscriber has relied solely upon independent investigation made by Subscriber and the Company’s representations warranties and covenants contained herein. Subscriber has not relied on any statements or other information provided by
anyone other than the Company concerning the Company, the Transaction, the Subscribed Shares or the offer and sale of the Subscribed Shares. Subscriber acknowledges and agrees that Subscriber has received and has had an adequate opportunity to
review such financial and other information as Subscriber deems necessary in order to make an investment decision with respect to the Subscribed Shares, including with respect to the Company and the Transaction (including Micromidas and its
subsidiaries (collectively, the “Acquired Companies”)) and made its own assessment and is satisfied concerning the 

  
 6 

 
relevant tax and other economic considerations relevant to Subscriber’s investment in the Subscribed Shares. Subscriber represents and agrees that Subscriber and Subscriber’s
professional advisor(s), if any, have had the full opportunity to ask such questions, receive such answers and obtain such information as Subscriber and such undersigned’s professional advisor(s), if any, have deemed necessary to make an
investment decision with respect to the Subscribed Shares. Without limiting the generality of the foregoing, Subscriber acknowledges that it has reviewed the Company’s filings with the Commission. 

(h) Subscriber became aware of this offering of the Subscribed Shares solely by means of direct contact between Subscriber and the Company
and/or Micromidas, or their respective representatives or affiliates, and the Subscribed Shares were offered to Subscriber solely by direct contact between Subscriber and the Company and/or Micromidas, or their respective affiliates. Subscriber did
not become aware of this offering of the Subscribed Shares, nor were the Subscribed Shares offered to Subscriber, by any other means. Subscriber acknowledges that the Company represents and warrants that the Subscribed Shares (i) were not
offered by any form of general solicitation or general advertising and (ii) are not being offered in a manner involving a public offering under, or in a distribution in violation of, the Securities Act, or any state securities laws. 

(i) Subscriber acknowledges that it is aware that there are substantial risks incident to the purchase and ownership of the Subscribed Shares.
Subscriber has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of an investment in the Subscribed Shares, and Subscriber has had an opportunity to seek, and has sought, such
accounting, legal, business and tax advice as Subscriber has considered necessary to make an informed investment decision. 
 (j) Subscriber
has adequately analyzed and fully considered the risks of an investment in the Subscribed Shares and determined that the Subscribed Shares are a suitable investment for Subscriber and that Subscriber is able at this time and in the foreseeable
future to bear the economic risk of a total loss of Subscriber’s investment in the Company. Subscriber acknowledges specifically that a possibility of total loss exists. 

(k) Subscriber understands and agrees that no federal or state agency has passed upon or endorsed the merits of the offering of the Subscribed
Shares or made any findings or determination as to the fairness of this investment. 
 (l) Subscriber is not owned or controlled by or acting
on behalf of (in connection with this Transaction), a Sanctioned Person. Subscriber is not an institution that accepts currency for deposit and that (a) has no physical presence in the jurisdiction in which it is incorporated or in which it is
operating and (b) is unaffiliated with a regulated financial group that is subject to consolidated supervision (a “Shell Bank”) or providing banking services to a Shell Bank. Subscriber represents that if it is a financial
institution subject to the Bank Secrecy Act (31 U.S.C. Section 5311 et seq.), as amended by the USA PATRIOT Act of 2001 and its implementing regulations (collectively, the “BSA/PATRIOT Act”), that Subscriber maintains policies
and procedures reasonably designed to comply with applicable obligations under the BSA/PATRIOT Act. Subscriber also represents that, to the extent required by applicable law, it maintains, either directly or through the use of a third-party
administrator, policies and procedures reasonably designed for the screening of any investors in Subscriber against Sanctions-related lists of blocked or restricted persons. Subscriber further represents and warrants that (a) the funds held by
Subscriber and used to purchase the Subscribed Shares were not directly or indirectly derived from or related to any activities that may contravene U.S. federal, state or non-U.S. anti-money laundering,
anti-corruption or Sanctions laws and regulations or activities that may otherwise be deemed criminal and (b) any returns from Subscriber’s investment will not be used to finance any illegal activities. For purposes of this Backstop
Subscription Agreement, “Sanctioned Person” means at any time any person or entity with whom dealings are restricted, prohibited, or sanctionable under any Sanctions (as defined below), including as a result of being:
(a) listed on any Sanctions-related list of designated or blocked or restricted persons; (b) that is a national of, the government of, or any agency or instrumentality of the government of, or resident in, or organized under the laws of, a
country or territory that is the target of comprehensive Sanctions from time to time (as of the date of this Backstop Subscription Agreement, Cuba, Iran, North Korea, Syria, and the Crimea region); or (c) a relationship of ownership, control,
or agency with any of the foregoing. “Sanctions” means those trade, economic and financial sanctions laws, regulations, embargoes, and restrictive measures (in each case having the force of law) administered, enacted or enforced
from time to time by (a) the United States (including without limitation the U.S. Department of the Treasury, Office of Foreign Assets Control, the U.S. Department of State, and the U.S. Department of Commerce), (b) the European Union and
enforced by its member states, (c) the United Nations and (d) the United Kingdom. 

  
 7 

 (m) Subscriber is not owned or controlled by or acting on behalf of (in connection with this
Transaction), a person or entity resident in, or whose funds used to purchase the Subscribed Shares are transferred from or through, a country, territory or entity that (i) has been designated as
non-cooperative with international anti-money laundering or counter terrorist financing principles or procedures by the United States or by an intergovernmental group or organization, such as the Financial
Action Task Force, of which the United States is a member; (ii) is the subject of an advisory issued by the Financial Crimes Enforcement Network of the U.S. Department of the Treasury; or (iii) has been designated by the Secretary of the
Treasury under Section 311 of the USA PATRIOT Act as warranting special measures due to money laundering concerns (any such country or territory, a “Non-cooperative Jurisdiction”), or an entity
or individual that resides or has a place of business in, or is organized under the laws of, a Non-cooperative Jurisdiction. 

(n) Subscriber does not have, as of the date hereof, and during the 30-day period immediately prior to
the date hereof Subscriber has not entered into, any “put equivalent position” as such term is defined in Rule 16a-1 under the Exchange Act or Short Sale positions with respect to the securities of
the Company. Notwithstanding the foregoing, in the case of a Subscriber that is a multi-managed investment vehicle whereby separate portfolio managers manage separate portions of Subscriber’s assets and the portfolio managers have no direct
knowledge of the investment decisions made by the portfolio managers managing other portions of Subscriber’s assets, the representation set forth above shall only apply with respect to the portion of assets managed by the portfolio manager that
made the investment decision to purchase the Subscribed Shares covered by this Backstop Subscription Agreement. 
 (o) Subscriber is not
currently (and at all times through Closing will refrain from being or becoming) a member of a “group” (within the meaning of Section 13(d)(3) or Section 14(d)(2) of the Exchange Act or any successor provision) including any
group acting for the purpose of acquiring, holding, voting or disposing of equity securities of the Company (within the meaning of Rule 13d-5(b)(1) under the Exchange Act). 

(p) If Subscriber is an employee benefit plan that is subject to Title I of the Employee Retirement Income Security Act of 1974, as amended
(“ERISA”), a plan, an individual retirement account or other arrangement that is subject to section 4975 of the Internal Revenue Code of 1986, as amended (the “Code”) or an employee benefit plan that is a
governmental plan (as defined in section 3(32) of ERISA), a church plan (as defined in section 3(33) of ERISA), a non-U.S. plan (as described in section 4(b)(4) of ERISA) or other plan that is not subject to
the foregoing but may be subject to provisions under any other federal, state, local, non-U.S. or other laws or regulations that are similar to such provisions of ERISA or the Code, or an entity whose
underlying assets are considered to include “plan assets” of any such plan, account or arrangement (each, a “Plan”) subject to the fiduciary or prohibited transaction provisions of ERISA or section 4975 of the Code,
Subscriber represents and warrants that (i) neither the Company, nor any of its affiliates, including Artius Acquisition Partners, LLC (the “Transaction Parties”), has acted as the Plan’s fiduciary, or has been relied on
for advice, with respect to its decision to acquire and hold the Subscribed Shares, and none of the Transaction Parties shall at any time be relied upon as the Plan’s fiduciary with respect to any decision to acquire, continue to hold or
transfer the Subscribed Shares and (ii) the acquisition and holding of the Subscribed Shares will not result in a non-exempt prohibited transaction under ERISA or Section 4975 of the Code. 

(q) Subscriber, at the time of payment of the Purchase Price in accordance with Section 2, will have sufficient funds to pay the Purchase
Price pursuant to Section 2. 
 (r) No broker or finder is entitled to any brokerage or finder’s fee or
commission solely in connection with the sale of the Subscribed Shares to Subscriber. 
 Section 5 Registration of Subscribed
Shares. 
 (a) The Company agrees that, within fifteen (15) Business Days after the Closing Date (the “Filing Date”), the
Company will file with the Commission (at the Company’s sole cost and expense) a registration statement registering the resale of the Subscribed Shares (the “Registration Statement”), and the Company shall use its commercially
reasonable efforts to have the Registration Statement declared effective as soon as practicable after the 

  
 8 

 
filing thereof (and in any event, no later than sixty (60) calendar days following the Filing Date) (the “Effectiveness Deadline”), provided, that the Effectiveness Deadline
shall be extended to ninety (90) calendar days after the Filing Date if the Registration Statement is reviewed by, and comments thereto are provided from, the Commission; provided, that if such day falls on a Saturday, Sunday or other day that
the Commission is closed for business, the Effectiveness Deadline shall be extended to the next Business Day on which the Commission is open for business. Notwithstanding the foregoing, if the Company is notified (orally or in writing, whichever is
earlier) by the Commission that the Registration Statement will not be “reviewed” or subject to further review, the Company shall use its commercially reasonable efforts to have the Registration Statement declared effective within ten
(10) Business Days of receipt of such notice. The Company will use its commercially reasonable efforts to provide a draft of the Registration Statement to the undersigned for review (but not comment, other than reasonable comments with respect
to information being provided by Subscriber for inclusion in the Registration Statement) at least two (2) Business Days in advance of filing the Registration Statement; provided that, for the avoidance of doubt, in no event shall the Company be
required to delay or postpone the filing of such Registration Statement as a result of or in connection with Subscriber’s review. Notwithstanding the foregoing, if the Commission prevents the Company from including any or all of the shares
proposed to be registered under the Registration Statement due to limitations on the use of Rule 415 of the Securities Act for the resale of the Subscribed Shares by the applicable stockholders or otherwise, such Registration Statement shall
register for resale such number of Subscribed Shares which is equal to the maximum number of Subscribed Shares as is permitted by the Commission. In such event, the number of Subscribed Shares to be registered for each selling stockholder named in
the Registration Statement shall be reduced pro rata among all such selling stockholders. The Company agrees that, except for such times as the Company is permitted hereunder to suspend the use of the prospectus forming part of a Registration
Statement, the Company will use commercially reasonable efforts to cause such Registration Statement to remain effective with respect to Subscriber until the earlier of (i) two (2) years from the issuance of the Subscribed Shares, (ii) the
date on which all of the Subscribed Shares shall have been sold, or (iii) on the first date on which the undersigned can sell all of its Subscribed Shares (or shares received in exchange therefor) under Rule 144 of the Securities Act without
limitation as to the manner of sale or the amount of such securities that may be sold. For as long as the Company is required to use commercially reasonable efforts to cause the Registration Statement to remain effective pursuant to the immediately
preceding sentence, the Company will use commercially reasonable efforts to file all reports, and provide all customary and reasonable cooperation, necessary to enable the undersigned to resell the Subscribed Shares pursuant to the Registration
Statement or Rule 144 of the Securities Act (when Rule 144 of the Securities Act becomes available to the Company), as applicable, qualify the Subscribed Shares for listing on the applicable stock exchange on which the Company’s Shares are then
listed, and update or amend the Registration Statement as necessary to include the Subscribed Shares. The undersigned agrees to disclose its beneficial ownership, as determined in accordance with Rule 13d-3 of
the Exchange Act, of Subscribed Shares to the Company (or its successor) upon request to assist the Company in making the determination described above. The Company’s obligations to include the Subscribed Shares in the Registration Statement
are contingent upon Subscriber furnishing in writing to the Company such information regarding Subscriber, the securities of the Company held by Subscriber and the intended method of disposition of the Subscribed Shares as shall be reasonably
requested by the Company to effect the registration of the Subscribed Shares, and Subscriber shall execute such documents in connection with such registration as the Company may reasonably request that are customary of a selling stockholder in
similar situations, including providing that the Company shall be entitled to postpone and suspend the effectiveness or use of the Registration Statement during any customary blackout or similar period or as permitted hereunder; provided, that
Subscriber shall not in connection with the foregoing be required to execute any lock-up or similar agreement or otherwise be subject to any contractual restriction on the ability to transfer the Subscribed
Shares.. In the case of the registration effected by the Company pursuant to this Backstop Subscription Agreement, the Company shall, upon reasonable request, inform Subscriber as to the status of such registration. In no event shall Subscriber be
identified as a statutory underwriter in the Registration Statement unless requested by the Commission. If the Commission requests that Subscriber be identified as a statutory underwriter in the Registration Statement, Subscriber shall have an
opportunity to withdraw from the Registration Statement. Subscriber shall not be entitled to use the Registration Statement for an underwritten offering of Subscribed Shares. Notwithstanding anything to the contrary contained herein, the Company may
delay or postpone filing of such Registration Statement, and from time to time require Subscriber not to sell under the Registration Statement or suspend the use or effectiveness of any such Registration Statement if it determines that in order for
the registration statement to not contain a material misstatement or omission, an amendment thereto would be needed, or if such filing or use could materially affect a bona fide business or financing transaction of the Company or would require
premature disclosure of information that could materially adversely affect the Company (each such circumstance, a “Suspension  

  
 9 

 
Event”); provided, that, (w) the Company shall not so delay filing or so suspend the use of the Registration Statement for a period of more than ninety (90) consecutive days
or more than a total of one hundred- twenty (120) calendar days, in each case in any three hundred sixty (360) day period and (x) the Company shall use commercially reasonable efforts to make such registration statement available for
the sale by the undersigned of such securities as soon as practicable thereafter. 
 (b) At its expense, the Company shall advise Subscriber
within two (2) Business Days: (i) of the issuance by the Commission of any stop order suspending the effectiveness of any Registration Statement or the initiation of any proceedings for such purpose; (ii) of the receipt by the Company
of any notification with respect to the suspension of the qualification of the Subscribed Shares included therein for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and (iii) subject to the
provisions in this Backstop Subscription Agreement, of the occurrence of a Suspension Event. Notwithstanding anything to the contrary set forth herein, the Company shall not, when so advising Subscriber of such events, provide Subscriber with any
material, non-public information regarding the Company other than to the extent that providing notice to Subscriber of the occurrence of such events would constitute material,
non-public information regarding the Company. 
 (c) Upon receipt of any written notice from the
Company (which notice shall not contain any material non-public information regarding the Company) of the happening of any Suspension Event during the period that the Registration Statement is effective or if
as a result of a Suspension Event the Registration Statement or related prospectus contains any untrue statement of a material fact or omits to state any material fact required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made (in the case of the prospectus) not misleading, the undersigned agrees that (i) it will immediately discontinue offers and sales of the Subscribed Shares under the Registration Statement
(excluding, for the avoidance of doubt, sales conducted pursuant to Rule 144) until the undersigned receives copies of a supplemental or amended prospectus (which the Company agrees to promptly prepare) that corrects the misstatement(s) or
omission(s) referred to above and receives notice that any post-effective amendment has become effective or unless otherwise notified by the Company that it may resume such offers and sales, and (ii) it will maintain the confidentiality of any
information included in such written notice delivered by the Company unless otherwise required by law, subpoena or regulatory request or requirement. If so directed by the Company, the undersigned will deliver to the Company or, in the
undersigned’s sole discretion destroy, all copies of the prospectus covering the Subscribed Shares in the undersigned’s possession; provided, however, that this obligation to deliver or destroy all copies of the prospectus covering the
Subscribed Shares shall not apply (w) to the extent the undersigned is required to retain a copy of such prospectus (A) in order to comply with applicable legal, regulatory, self-regulatory or professional requirements or (B) in
accordance with a bona fide pre-existing document retention policy or (x) to copies stored electronically on archival servers as a result of automatic data back-up.

 (d) For purposes of this Section 5, “Subscribed Shares” shall mean, as of any date of determination, the Subscribed Shares
(as defined in the recitals to this Backstop Subscription Agreement) and any other equity security issued or issuable with respect to the Subscribed Shares by way of share split, dividend, distribution, recapitalization, merger, exchange,
replacement or similar event, and “Subscriber” shall include any affiliate of the undersigned Subscriber to which the rights under this Section 5 shall have been duly assigned. 

(e) 
  

	 	(i)	 The Company agrees to indemnify, to the extent permitted by law, Subscriber (to the extent a seller under the
Registration Statement), its directors and officers, employees and agents, and each person who controls Subscriber (within the meaning of the Securities Act), to the extent permitted by law, against all losses, claims, damages, liabilities and
reasonable and documented out of pocket expenses (including reasonable and documented attorneys’ fees of one law firm (plus the fees of any local counsel)) caused by any untrue or alleged untrue statement of material fact contained in, or
incorporated by reference in, the Registration Statement, prospectus included in the Registration Statement (“Prospectus”) or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a
material fact required to be stated therein or necessary to make the statements therein (in the case of a Prospectus, in the light of the circumstances under which they were made) not misleading, except insofar as the same are caused by or contained
in any information furnished in writing to the Company by or on behalf of Subscriber expressly for use therein. 

  

  
 10 

	 	(ii)	 Subscriber shall, to the extent permitted by law, indemnify the Company, its directors and officers, employees
and agents, and each person or entity who controls the Company (within the meaning of the Securities Act) against any losses, claims, damages, liabilities and expenses (including, without limitation, reasonable and documented outside attorneys’
fees) resulting from any untrue or alleged untrue statement of material fact contained in, or incorporated by reference in, the Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any
omission or alleged omission of a material fact required to be stated therein or necessary to make the statements therein (in the case of a Prospectus, in the light of the circumstances under which they were made) not misleading, but only to the
extent that such untrue statement or omission is contained (or not contained in, in the case of an omission) in any information or affidavit so furnished in writing by or on behalf of Subscriber expressly for use therein. In no event shall the
liability of Subscriber be greater in amount than the dollar amount of the net proceeds received by Subscriber upon the sale of the Subscribed Shares giving rise to such indemnification obligation. Subscriber shall notify the Company promptly of the
institution, threat or assertion of any proceeding arising from or in connection with the transactions contemplated by this Section 5 of which Subscriber is aware. 

 

	 	(iii)	 Any person or entity entitled to indemnification herein shall (A) give prompt written notice to the
indemnifying party of any claim with respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s or entity’s right to indemnification hereunder to the extent such failure
has not prejudiced the indemnifying party) and (B) unless in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties or separate defenses may exist with respect to such claim,
permit such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to the indemnified party. If such defense is assumed, the indemnifying party shall not be subject to any liability for any settlement made by the
indemnified party without its consent (but such consent shall not be unreasonably withheld, delayed or conditioned). An indemnifying party who is not entitled to, or elects not to, assume the defense of a claim shall not be obligated to pay the fees
and expenses of more than one counsel (plus any local counsel) for all parties indemnified by such indemnifying party with respect to such claim, unless in the reasonable judgment of legal counsel to any indemnified party a conflict of interest
exists between such indemnified party and any other of such indemnified parties with respect to such claim. No indemnifying party shall, without the consent of the indemnified party, consent to the entry of any judgment or enter into any settlement
which cannot be settled in all respects by the payment of money (and such money is so paid by the indemnifying party pursuant to the terms of such settlement) or which settlement includes a statement or admission of fault and culpability on the part
of such indemnified party or which does not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release from all liability in respect to such claim or litigation.

 

	 	(iv)	 The indemnification provided for under this Backstop Subscription Agreement shall remain in full force and
effect regardless of any investigation made by or on behalf of the indemnified party or any officer, director or controlling person or entity of such indemnified party and shall survive the transfer of the Subscribed Shares purchased pursuant to
this Backstop Subscription Agreement. 

  

	 	(v)	 If the indemnification provided under this Section 5(e) from the indemnifying
party is unavailable or insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities and expenses referred to herein, then the indemnifying party, in lieu of indemnifying the indemnified party, shall
contribute to the amount paid or payable by the indemnified party as a result of such losses, claims, damages, liabilities and expenses in such proportion as is appropriate to reflect the relative fault of the indemnifying party and the indemnified
party, as well as any other relevant equitable considerations. The relative fault of 

  
 11 

	 	
the indemnifying party and indemnified party shall be determined by reference to, among other things, whether any action in question, including any untrue or alleged untrue statement of a
material fact or omission or alleged omission to state a material fact, was made by (or not made by, in the case of an omission), or relates to information supplied by (or not supplied by, in the case of an omission), or on behalf of, such
indemnifying party or indemnified party, and the indemnifying party’s and indemnified party’s relative intent, knowledge, access to information and opportunity to correct or prevent such action. The amount paid or payable by a party as a
result of the losses or other liabilities referred to above shall be deemed to include, subject to the limitations set forth in Sections 5(e)(i), (ii) and (iii) above, any legal or other fees, charges or
expenses reasonably incurred by such party in connection with any investigation or proceeding. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution
pursuant to this Section 5(e)(v) from any person or entity who was not guilty of such fraudulent misrepresentation. Notwithstanding anything to the contrary herein, in no event will any party be liable for consequential, special,
exemplary or punitive damages in connection with this Backstop Subscription Agreement. Each indemnifying party’s obligation to make a contribution pursuant to this Section 5(e)(v) shall be individual, not joint and
several, and in no event shall the liability of any Subscriber hereunder be greater in amount than the dollar amount of the net proceeds received by such Subscriber upon the sale of the Subscribed Shares giving rise to such indemnification
obligation. 

 (f) If the Subscribed Shares acquired hereunder are eligible to be sold without restriction under, and without
the requirement for the Company to be in compliance with the current public information requirements of, Rule 144 then at Subscriber’s request, the Company will reasonably cooperate with the Company’s transfer agent, such that any
remaining restrictive legend set forth on such Subscribed Shares will be removed in connection with a sale of such shares. 
 Section 6
Short Sales. Subscriber hereby agrees that, from the date of this Backstop Subscription Agreement until the earlier of the Closing or the termination of this Backstop Subscription Agreement, none of Subscriber, its controlled affiliates, or
any person or entity acting on behalf of Subscriber or any of its controlled affiliates or pursuant to any understanding with Subscriber or any of its controlled affiliates will engage in any Short Sales with respect to securities of the Company
prior to the Closing. For purposes of this Backstop Subscription Agreement, “Short Sales” shall include, without limitation, all “short sales” as defined in Rule 200 promulgated under Regulation SHO under the Exchange Act, and
all types of direct and indirect stock pledges (other than pledges in the ordinary course of business as part of prime brokerage arrangements), forward sale contracts, options, puts, calls, swaps and similar arrangements (including on a total return
basis), and sales and other transactions through non-U.S. broker dealers or foreign regulated brokers. Notwithstanding the foregoing, (i) nothing herein shall prohibit other entities under common
management with Subscriber that have no knowledge of this Backstop Subscription Agreement or of Subscriber’s participation in the Transaction (including Subscriber’s controlled affiliates and/or affiliates) from entering into any Short
Sales and (ii) in the case of a Subscriber that is a multi-managed investment vehicle whereby separate portfolio managers manage separate portions of such Subscriber’s assets and the portfolio managers have no knowledge of the investment
decisions made by the portfolio managers managing other portions of such Subscriber’s assets, the covenant set forth above shall only apply with respect to the portion of assets managed by the portfolio manager that made the investment decision
to purchase the Subscribed Shares covered by this Backstop Subscription Agreement. 
 Section 7 Termination. This Backstop
Subscription Agreement shall terminate and be void and of no further force and effect, and all rights and obligations of the parties hereunder shall terminate without any further liability on the part of either party in respect thereof, upon the
earlier to occur of (a) such date and time as the Transaction Agreement is terminated in accordance with its terms, (b) upon the mutual written agreement of the parties hereto to terminate this Backstop Subscription Agreement, or
(c) if, on the Closing Date of the Transaction, any of the conditions to Closing set forth in Section 2 of this Backstop Subscription Agreement have not been satisfied as of the time required hereunder to be so satisfied or waived by the
party entitled to grant such waiver and, as a result thereof, the transactions contemplated by this Backstop Subscription Agreement are not consummated, or (d) written notice by either party to the other party to terminate this Backstop
Subscription Agreement if the transactions contemplated by this Backstop Subscription Agreement are not consummated on or prior to August 31, 2021; provided, that nothing 

  
 12 

 
herein will relieve any party from liability for any intentional breach hereof prior to the time of termination, and each party will be entitled to any remedies at law or in equity to recover
losses, liabilities or damages arising from such breach. The Company shall notify Subscriber of the termination of the Transaction Agreement promptly after the termination thereof. 

Section 8 Trust Account Waiver. Subscriber hereby acknowledges that the Company has established a trust account (the
“Trust Account”) containing the proceeds of its initial public offering (the “IPO”) and from certain private placements occurring simultaneously with the IPO (including interest accrued from time to time thereon)
for the benefit of the Company’s public stockholders and certain other parties (including the underwriters of the IPO). For and in consideration of the Company entering into this Backstop Subscription Agreement, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, Subscriber hereby (a) agrees that it does not now and shall not at any time hereafter have any right, title, interest or claim of any kind in or to any assets held in
the Trust Account, and shall not make any claim against the Trust Account, regardless of whether such claim arises as a result of, in connection with or relating in any way to this Backstop Subscription Agreement or any other matter, and regardless
of whether such claim arises based on contract, tort, equity or any other theory of legal liability (any and all such claims are collectively referred to hereafter as the “Released Claims”), (b) irrevocably waives any Released
Claims that it may have against the Trust Account now or in the future as a result of, or arising out of, any negotiations, contracts or agreements with the Company, and (c) will not seek recourse against the Trust Account for any reason
whatsoever; provided, however, that nothing in this Section 8 shall be deemed to limit any Subscriber’s right to distributions from the Trust Account in accordance with the Company’s amended and restated
certificate of incorporation in respect of the Shares of the Company acquired by any means other than pursuant to this Backstop Subscription Agreement. 

Section 9 Miscellaneous. 

(a) All notices, requests, demands, claims, and other communications hereunder shall be in writing. Any notice, request, demand, claim, or
other communication hereunder shall be deemed duly given (i) when delivered personally to the recipient, (ii) when sent by electronic mail (which is confirmed), on the date of transmission to such recipient; (iii) one (1) Business Day
after being sent to the recipient by reputable overnight courier service (charges prepaid), or (iv) four (4) Business Days after being mailed to the recipient by certified or registered mail, return receipt requested and postage prepaid, and,
in each case, addressed to the intended recipient at its address specified on the signature page hereof or to such electronic mail address or address as subsequently modified by written notice given in accordance with this
Section 9(a). A courtesy electronic copy of any notice sent by methods (i), (iii), or (iv) above shall also be sent to the recipient via electronic mail if provided in the applicable signature page hereof or to an
electronic mail address as subsequently modified by written notice given in accordance with this Section 9(a). 

(b) Subscriber acknowledges that the Company, Micromidas and others will rely on the acknowledgments, understandings, agreements,
representations and warranties of Subscriber contained in this Backstop Subscription Agreement. Prior to the Closing, Subscriber agrees to promptly notify the Company and Micromidas if it becomes aware that any of the acknowledgments,
understandings, agreements, representations and warranties of Subscriber set forth herein are no longer accurate in all material respects. The Company acknowledges that Subscriber and will rely on the acknowledgments, understandings, agreements,
representations and warranties contained in this Backstop Subscription Agreement. Prior to the Closing, the Company agrees to promptly notify Subscriber if it becomes aware that any of the acknowledgments, understandings, agreements, representations
and warranties of the Company set forth herein are no longer accurate in all material respects. 
 (c) Each of the Company, Micromidas and
Subscriber is irrevocably authorized to produce this Backstop Subscription Agreement or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby. 

(d) Each of the Company and Subscriber shall pay all of its own expenses in connection with this Backstop Subscription Agreement and the
transactions contemplated herein. The Company shall be responsible for the fees of its transfer agent, stamp taxes and DTC fees associated with the issuance of the Subscribed Shares. 

  
 13 

 (e) Neither this Backstop Subscription Agreement nor any rights that may accrue to
Subscriber hereunder (other than the Subscribed Shares acquired hereunder, if any) may be transferred or assigned. Neither this Backstop Subscription Agreement nor any rights that may accrue to the Company hereunder may be transferred or assigned
(provided, that, for the avoidance of doubt, the Company may transfer the Backstop Subscription Agreement and its rights hereunder solely in connection with the consummation of the Transaction and exclusively to another entity under the control of,
or under common control with, the Company). Notwithstanding the foregoing, Subscriber may assign its rights and obligations under this Backstop Subscription Agreement to one or more of its affiliates (including other investment funds or accounts
managed or advised by the investment manager who acts on behalf of Subscriber or by an affiliate of such investment manager) or, with the Company’s prior written consent, to another person, provided that no such assignment shall relieve
Subscriber of its obligations hereunder if any such assignee fails to perform such obligations, unless the Company has given prior written consent to such relief. 

(f) All the agreements, representations and warranties made by each party hereto in this Backstop Subscription Agreement shall survive the
Closing. 
 (g) The Company may request from Subscriber such additional information as the Company may reasonably deem necessary to evaluate
the eligibility of Subscriber to acquire the Subscribed Shares, and Subscriber shall promptly provide such information as may be reasonably requested. Subscriber acknowledges that the Company may file a copy of a form of this Backstop Subscription
Agreement with the Commission (and such copy shall not identify Subscriber and, if applicable, its investment adviser by name (except to the extent required by the federal securities laws, exchange rules, the Commission or any other securities
authorities or any rules and regulations promulgated thereby)) as an exhibit to a periodic report of the Company or a registration statement of the Company. 

(h) This Backstop Subscription Agreement may not be amended, modified or waived except by an instrument in writing signed by each of the
parties hereto. 
 (i) This Backstop Subscription Agreement and any non-disclosure agreement entered
into by the parties hereto constitute the entire agreement, and supersedes all other prior agreements, understandings, representations and warranties, both written and oral, among the parties, with respect to the subject matter hereof. 

(j) Except as otherwise provided herein, this Backstop Subscription Agreement is intended for the benefit of the parties hereto and their
heirs, executors, administrators, successors, legal representatives, and permitted assigns and is not for the benefit of, nor may any provision hereof be enforced by, any other person. Except as set forth in Section 9(b),
Section 9(c) and this Section 9(j) with respect to the persons specifically referenced therein, this Backstop Subscription Agreement shall not confer any rights or remedies upon any person other
than the parties hereto, and their respective successor and assigns, and the parties hereto acknowledge that such persons so referenced are third party beneficiaries of this Backstop Subscription Agreement for the purposes of, and to the extent of,
the rights granted to them, if any, pursuant to the applicable provisions. 
 (k) The parties hereto acknowledge and agree that irreparable
damage would occur in the event that any of the provisions of this Backstop Subscription Agreement were not performed in accordance with their specific terms or were otherwise breached and that money or other legal remedies would not be an adequate
remedy for such damage. It is accordingly agreed that the parties shall be entitled to equitable relief, including in the form of an injunction or injunctions to prevent breaches or threatened breaches of this Backstop Subscription Agreement and to
enforce specifically the terms and provisions of this Backstop Subscription Agreement, this being in addition to any other remedy to which such party is entitled at law, in equity, in contract, in tort or otherwise. The parties hereto acknowledge
and agree that Micromidas shall be entitled to rely on the provisions of the Backstop Subscription Agreement of which Micromidas is an express third party beneficiary on the terms and subject to the conditions set forth herein. The parties hereto
further acknowledge and agree: (x) to waive any requirement for the security or posting of any bond in connection with any such equitable remedy; (y) not to assert that a remedy of specific enforcement pursuant to this
Section 9(k) is unenforceable, invalid, contrary to applicable law or inequitable for any reason; and (z) to waive any defenses in any action for specific performance, including the defense that a remedy at law would
be adequate. 
 (l) In any dispute arising out of or related to this Backstop Subscription Agreement, or any other agreement, document,
instrument or certificate contemplated hereby, or any transactions contemplated hereby or thereby, the applicable adjudicating body shall award to the prevailing party, if any, the documented out-of-pocket costs and attorneys’ fees reasonably incurred by the prevailing party in connection with the dispute and the 

  
 14 

 
enforcement of its rights under this Backstop Subscription Agreement or any other agreement, document, instrument or certificate contemplated hereby and, if the adjudicating body determines a
party to be the prevailing party under circumstances where the prevailing party won on some but not all of the claims and counterclaims, the adjudicating body may award the prevailing party an appropriate percentage of the documented out-of-pocket costs and attorneys’ fees reasonably incurred by the prevailing party in connection with the adjudication and the enforcement of its rights under this
Backstop Subscription Agreement or any other agreement, document, instrument or certificate contemplated hereby or thereby. 
 (m) If any
provision of this Backstop Subscription Agreement shall be invalid, illegal or unenforceable, the validity, legality or enforceability of the remaining provisions of this Backstop Subscription Agreement shall not in any way be affected or impaired
thereby and shall continue in full force and effect. 
 (n) No failure or delay by a party hereto in exercising any right, power or remedy
under this Backstop Subscription Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this
Backstop Subscription Agreement by a party hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right,
power or remedy hereunder. The election of any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Backstop
Subscription Agreement shall entitle the party receiving such notice or demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or
further action in any circumstances without such notice or demand. 
 (o) This Backstop Subscription Agreement may be executed and delivered
in one or more counterparts (including by facsimile or electronic mail or in .pdf) and by different parties in separate counterparts, with the same effect as if all parties hereto had signed the same document. All counterparts so executed and
delivered shall be construed together and shall constitute one and the same agreement. 
 (p) This Backstop Subscription Agreement shall be
governed by, and construed in accordance with, the laws of the State of New York, without regard to the principles of conflicts of laws that would otherwise require the application of the law of any other state. 

(q) EACH PARTY AND ANY PERSON ASSERTING RIGHTS AS A THIRD PARTY BENEFICIARY HEREBY WAIVES ITS RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY
CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OR RELATED TO THIS BACKSTOP SUBSCRIPTION AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY IN ANY ACTION, PROCEEDING OR OTHER LITIGATION OF ANY TYPE BROUGHT BY ANY PARTY AGAINST ANY OTHER PARTY OR
ANY AFFILIATE OF ANY OTHER SUCH PARTY, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS OR OTHERWISE. THE PARTIES AGREE THAT ANY SUCH CLAIM OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY. WITHOUT LIMITING THE FOREGOING, THE
PARTIES FURTHER AGREE THAT THEIR RESPECTIVE RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS SECTION AS TO ANY ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THIS
BACKSTOP SUBSCRIPTION AGREEMENT OR ANY PROVISION HEREOF. THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS BACKSTOP SUBSCRIPTION AGREEMENT. 

(r) The parties agree that all disputes, legal actions, suits and proceedings arising out of or relating to this Backstop Subscription
Agreement must be brought exclusively in the United States District Court for the Southern District of New York, the Supreme Court of the State of New York and the federal or state appellate courts located in the State of New York (collectively the
“Designated Courts”). Each party hereby consents and submits to the exclusive jurisdiction of the Designated Courts. No legal action, suit or proceeding with respect to this Backstop Subscription Agreement may be brought in any
other forum. Each party hereby irrevocably waives all claims of immunity from jurisdiction, and any objection which such party may now or hereafter have to the laying of venue of any suit, action or proceeding in any Designated Court, including any
right to object on the basis that any dispute, action, suit or 

  
 15 

 
proceeding brought in the Designated Courts has been brought in an improper or inconvenient forum or venue. Each of the parties also agrees that delivery of any process, summons, notice or
document to a party hereof in compliance with Section 9(a) of this Backstop Subscription Agreement shall be effective service of process for any action, suit or proceeding in a Designated Court with respect to any matters
to which the parties have submitted to jurisdiction as set forth above. 
 (s) This Backstop Subscription Agreement may only be enforced
against, and any claim, action, suit or other legal proceeding based upon, arising out of, or related to this Backstop Subscription Agreement, or the negotiation, execution or performance of this Backstop Subscription Agreement, may only be brought
against the entities that are expressly named as parties or third party beneficiaries hereto and then only with respect to the specific obligations set forth herein with respect to such party or third party beneficiary. No past, present or future
director, officer, employee, incorporator, manager, member, partner, stockholder, affiliate, agent, attorney or other representative of any party hereto or of any affiliate of any party hereto, or any of their successors or permitted assigns, shall
have any liability for any obligations or liabilities of any party hereto under this Backstop Subscription Agreement or for any claim, action, suit or other legal proceeding based on, in respect of or by reason of the transactions contemplated
hereby. 
 (t) Notwithstanding anything in this Backstop Subscription Agreement to the contrary, the Company shall have the right to publicly
disclose the name of Subscriber, its investment adviser or any of their respective affiliates, Subscriber’s beneficial ownership of the Subscribed Shares, or the nature of Subscriber’s commitments, arrangements and understandings under and
relating to this Backstop Subscription Agreement in any press release issued by the Company, any Form 8-K filed by the Company with the Commission in connection with the execution and delivery of this Backstop
Subscription Agreement and any registration statement filed or amended on or after the date hereof; provided, however, that the Company shall provide Subscriber with prior written notice of any such disclosure and shall reasonably consult with
Subscriber regarding such disclosure. Subscriber will promptly provide any information reasonably requested by the Company for any regulatory application or filing made or approval sought in connection with the Transaction (including filings with
the Commission). 
 (u) If any change in the Shares shall occur between the date of this Backstop Subscription Agreement and immediately
prior to the Closing by reason of any reclassification, recapitalization, stock split (including reverse stock split) or combination, exchange or readjustment of shares, or any stock dividend, the number of Subscribed Shares issued to Subscriber
shall be appropriately adjusted to reflect such change. 
 (v) Subscriber shall not redeem any shares of the Company in connection with the
special meeting of the shareholders of the Company to approve the Transaction. 
 (w) [Subscriber agrees and acknowledges that the Subscribed
Shares shall be subject to the Lock-Up Agreement, to be dated June 25, 2021, by and among the Company, [ ], and the other Company stockholders listed on Schedule A thereto, as if Subscriber was a party
thereof with respect to the Subscribed Shares.]1 
 [Signature pages follow.] 

 

	1 	 Applies to some Subscribers. 

  
 16 

 IN WITNESS WHEREOF, each of the Company and Subscriber has executed or caused this
Backstop Subscription Agreement to be executed by its duly authorized representative as of the date first set forth above. 
  

			
	ARTIUS ACQUISITION INC.
		
	By:	 	              

	Name:
	Title
	
	 Address for Notices
  

3 Columbus Circle, Suite 2215

	New York, New York 10019
	
	ATTN: Boon Sim, Chief Executive Officer
	 EMAIL: boon@artiuscapital.com
  

with a copy (not to constitute notice) to:

	
	CLEARY GOTTLIEB STEEN & HAMILTON LLP
	ONE LIBERTY PLAZA, NEW YORK NY 10006
		
	ATTN:	 	 Paul J. Shim
 Adam J. Brenneman

	
		
	EMAIL:	 	 pshim@cgsh.com

abrenneman@cgsh.com

  
 17 

 
			
	By:	 	
                     
        

		 	Name:
		 	Title
	Address for Notices:
	
	Name in which shares are to be registered:

  

					
	 Number of Subscribed Shares subscribed for:
	  			
		  	  
	  
	 
	 Price Per Subscribed Share:
	  	$	10.00	 
	 Aggregate Purchase Price:
	  	$	 	 
		  	  
	  
	 

 You must pay the Purchase Price by wire transfer of United States dollars in immediately available funds to
the account of the Company specified by the Company in the Closing Notice. 

  
 18 

 ANNEX A 

ELIGIBILITY REPRESENTATIONS OF SUBSCRIBER 

This Annex A should be completed and signed by Subscriber 

and constitutes a part of the Backstop Subscription Agreement. 
  

	A.	 QUALIFIED INSTITUTIONAL BUYER STATUS (Please check the box, if applicable) 

 

	 	☐	 Subscriber is a “qualified institutional buyer” (as defined in Rule 144A under the Securities Act).

  

	B.	 ACCREDITED INVESTOR STATUS (Please check the box) 

 

	 	☐	 Subscriber is an “accredited investor” (within the meaning of Rule 501(a)(1), (2), (3), (5), (6), (7)
or (8) under the Securities Act) and has marked and initialed the appropriate box below indicating the provision under which it qualifies as an “accredited investor.” 

 

	C.	 AFFILIATE STATUS (Please check the applicable box) 

SUBSCRIBER: 
  

	 	☐	 is: 

  

	 	☐	 is not: 

an “affiliate” (as defined in Rule 144 under the Securities Act) of the Company or acting on behalf of an affiliate of the Company.

 Rule 501(a), in relevant part, states that an “accredited investor” shall mean any person who comes within any of the below
listed categories, or who the issuer reasonably believes comes within any of the below listed categories, at the time of the sale of the securities to that person. Subscriber has indicated, by marking and initialing the appropriate box below, the
provision(s) below which apply to Subscriber and under which Subscriber accordingly qualifies as an “accredited investor.” 
  

	 	☐	 Any bank, registered broker or dealer, insurance company, registered investment company, business development
company, or small business investment company; 

  

	 	☐	 Any plan established and maintained by a state, its political subdivisions, or any agency or instrumentality of
a state or its political subdivisions for the benefit of its employees, if such plan has total assets in excess of $5,000,000; 

  

	 	☐	 Any employee benefit plan, within the meaning of the Employee Retirement Income Security Act of 1974, if a
bank, insurance company, or registered investment adviser makes the investment decisions, or if the plan has total assets in excess of $5,000,000; 

  

	 	☐	 Any corporation, similar business trust, partnership or any organization described in Section 501(c)(3) of
the Internal Revenue Code, not formed for the specific purpose of acquiring the securities offered, with total assets in excess of $5,000,000; 

  

	 	☐	 Any natural person whose individual net worth, or joint net worth with that person’s spouse or spousal
equivalent, exceeds $1,000,000; provided, however, that the following will be excluded when calculating a person’s net worth: (1) the person’s primary 

	 	
residence shall not be included as an asset; (2) indebtedness that is secured by the person’s primary residence, up to the estimated fair market value of the primary residence at the
time of the sale of securities, shall not be included as a liability (except that if the amount of such indebtedness outstanding at the time of sale the Subscribed Shares exceeds the amount outstanding 60 days before such time, other than as a
result of the acquisition of the primary residence, the amount of such excess shall be included as a liability); and (3) indebtedness that is secured by the person’s primary residence in excess of the estimated fair market value of the
primary residence at the time of the sale of the Subscribed Shares shall be included as a liability; 

  

	 	☐	 Any natural person who had an individual income in excess of $200,000 in each of the two most recent years or
joint income with that person’s spouse or spousal equivalent in excess of $300,000 in each of those years and has a reasonable expectation of reaching the same income level in the current year; 

 

	 	☐	 Any trust with assets in excess of $5,000,000, not formed to acquire the securities offered, whose purchase is
directed by a sophisticated person; or 

  

	 	☐	 Any entity in which all of the equity owners are accredited investors. 

D. FINANCIAL DUE DILIGENCE (Applicable to “natural persons” only) 

Rule 506(c)(ii) requires that an issuer take reasonable steps to verify that purchasers of the Subscribed Shares are accredited investors. An
issuer shall be deemed to take reasonable steps to verify if the issuer uses one of the following non-exclusive methods. Please check the applicable box indicating what form of verification is being provided
by Subscriber. 
  

	 	☐	 Any Internal Revenue Service form that reports Subscriber’s income for the two most recent years
(including, but not limited to, Form W-2, Form 1099, Schedule K-1 to Form 1065, and Form 1040) and a written representation from Subscriber that he or she has a
reasonable expectation of reaching the income level necessary to qualify as an accredited investor during the current year; 

  

	 	☐	 One or more of the following types of documentation dated within the prior three months: (1) with respect
to assets, bank statements, brokerage statements and other statements of securities holdings, certificates of deposit, tax assessments, and appraisal reports issued by independent third parties; and (2) with respect to liabilities, a consumer
report from at least one of the nationwide consumer reporting agencies, and a written representation from Subscriber that all liabilities necessary to make a determination of net worth have been disclosed; or 

 

	 	☐	 A written confirmation from (1) a registered broker-dealer, (2) an investment adviser registered with
the Commission, (3) a licensed attorney who is in good standing under the laws of the jurisdictions in which he or she is admitted to practice law or (4) a certified public accountant who is duly registered and in good standing under the
laws of the place of his or her residence or principal office that such person or entity has taken reasonable steps to verify that Subscriber is an accredited investor within the prior three months and has determined that such Subscriber is an
accredited investor. 

 
			
	[SUBSCRIBER]
		
	By:	 	          

		 	Name:
		 	Title

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