Document:

EX-10.2

 Exhibit 10.2 

Execution Version 

September 25, 2022 
 Decarbonization Plus Acquisition
Corporation IV 
 2744 Sand Hill Road 
 Menlo Park, CA 

Hammerhead Resources Inc. 
 2700, 525-8th Avenue SW 
 Calgary, Alberta T2P 1G1 

Re:    Sponsor Letter 

Ladies and Gentlemen: 
 This letter (this “Sponsor
Letter”) is being delivered to you in accordance with that Business Combination Agreement, dated as of the date hereof, by and among Decarbonization Plus Acquisition Corporation IV, a Cayman Islands exempted company
(“SPAC”), Hammerhead Resources Inc., an Alberta corporation (the “Company”), Hammerhead Energy Inc., an Alberta corporation (“NewCo”), and 2453729 Alberta ULC, an Alberta
unlimited liability corporation (the “Business Combination Agreement”), and the transactions contemplated therein (the “Business Combination”). Certain capitalized terms used herein are
defined in paragraph 4 hereof. Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Business Combination Agreement. 

Decarbonization Plus Acquisition Sponsor IV LLC, a Cayman Islands limited liability company (the “Sponsor”), currently is the record
owner of (i) 7,698,495 SPAC Class B Ordinary Shares (the “SPAC Founder Shares”) and (ii) 12,488,255 SPAC Warrants that were acquired in a private placement that occurred simultaneously with the consummation of the
SPAC’s initial public offering (the “Private Placement Warrants” and collectively with the SPAC Founder Shares, the “Sponsor Equity”). 

On or about the date hereof, the Sponsor and the other holders of SPAC Founder Shares and Private Placement Warrants (collectively, the “Sponsor
Group”) entered into a letter agreement (the “Sponsor Side Letter”) with Riverstone Global Energy and Power Fund V (Cayman), L.P. (“Riverstone”) and certain other affiliates of Riverstone
pursuant to which the Sponsor Group agreed to transfer to Riverstone or one of its controlled affiliates a portion of its Sponsor Equity in connection with the Business Combination (the “Sponsor Group Transfer”). 

 In order to induce the Company and SPAC to enter into the Business Combination Agreement and for other good
and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
  

	1)	 Each of the Sponsor and, to the extent the Sponsor Group Transfer occurs prior to the record date of the the
extraordinary general meeting of SPAC’s shareholders relating to the Business Combination (the “SPAC Shareholder Meeting”), Riverstone, irrevocably agrees that it shall (and shall cause its controlled affiliates to):

  

	 	a)	 vote any SPAC Class A Ordinary Shares and SPAC Founder Shares owned by it in favor of the Business
Combination and each other proposal related to the Business Combination included on the agenda for the SPAC Shareholder Meeting, except that it shall not vote any SPAC Class A Ordinary Shares that it purchases after SPAC publicly announces its
intention to engage in the Business Combination for or against any of the aforementioned proposals; 

  

	 	b)	 when the SPAC Shareholder Meeting is held, appear at such meeting or otherwise cause the SPAC Class A
Ordinary Shares and SPAC Founder Shares owned by it (all such shares, the “Covered Shares”) to be counted as present thereat for the purpose of establishing a quorum; 

 

	 	c)	 vote (or execute and return an action by written resolution), or cause to be voted at such meeting, or validly
execute and return and cause such written resolution to be granted with respect to, all of such Covered Shares against (i) any Alternative Transaction and (ii) any other action that would reasonably be expected to (A) impede,
interfere with, delay, postpone or adversely affect the Business Combination or any of the other transactions contemplated by the Business Combination Agreement or result in a breach of any covenant, representation or warranty or other obligation or
agreement of SPAC under the Business Combination Agreement or result in any of the conditions set forth in Article VII of the Business Combination Agreement not being fulfilled, (B) result in a breach of any covenant, representation or
warranty or other obligation or agreement of it contained in this Sponsor Letter or (C) change in any manner the dividend policy or capitalization of, including the voting rights of, any class of shares of SPAC (other than as contemplated by
the Business Combination Agreement); 

  

	 	d)	 vote (or execute and return an action by written resolution), or cause to be voted at such meeting, or validly
execute and return and cause such written resolution to be granted with respect to, all of such Covered Shares against any change in business, management or Board of Directors of SPAC (other than in connection with the Business Combination and the
other proposals related to the Business Combination); and 

  

	 	e)	 not redeem any SPAC Founder Shares owned by it in connection with such SPAC shareholder approval.

 Prior to any valid termination of the Business Combination Agreement, the Sponsor or Riverstone, as the case may be,
shall take, or cause to be taken, all actions and to do, or cause to be done, all things reasonably necessary under applicable Laws to consummate the transactions contemplated by this Sponsor Letter. 

The obligations of the Sponsor or Riverstone, as the case may be, specified in this paragraph 1 shall apply whether or not the Business
Combination or any action described above is recommended by the SPAC Board. 

  
 2 

	2)	 Each of the Sponsor and Riverstone agrees that it shall not (and shall cause its controlled affiliates not to):

  

	 	a)	 Transfer any SPAC Founder Shares, SPAC Class B Common Shares or New SPAC Class B Common Shares (or
New SPAC Class A Common Shares issuable upon conversion of New SPAC Class B Common Shares in connection with the Business Combination) until the earlier of (i) one year after the Closing or (ii) subsequent to the Closing,
(x) if the last sale price of the New SPAC Class A Common Shares equals or exceeds US$12.00 per share (as adjusted for share subdivisions, share dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any
30-day trading period commencing at least 150 days after the Closing or (y) the date on which New SPAC completes a liquidation, amalgamation, share exchange or other similar transaction that results in
all of New SPAC’s shareholders having the right to exchange their shares for cash, securities or other property (the “Founder Shares Lock-up Period”). 

 

	 	b)	 Transfer any Private Placement Warrants or New SPAC Warrants (or New SPAC Class A Common Shares issued or
issuable upon exercise of the New SPAC Warrants) until 30 days after the Closing (the “Warrants Lock-up Period”). 

Notwithstanding the provisions set forth in paragraphs 2(a) and 2(b), Transfers of the SPAC Founder Shares, SPAC Class B Common Shares,
New SPAC Class B Common Shares, Private Placement Warrants, New SPAC Warrants and New SPAC Class A Common Shares issued or issuable upon the exercise or conversion of the SPAC Class B Common Shares and New SPAC Warrants and that are
held by the Sponsor or any of its permitted transferees (that have complied with this paragraph) are permitted in accordance with paragraph 7(c) of that certain Letter Agreement, dated August 10, 2021, among SPAC, its officers and directors and
the Sponsor ((as amended), the “SPAC Letter Agreement”), including to effect the Sponsor Group Transfer. 
  

	3)	 The Sponsor hereby agrees that, during the period commencing on the date hereof and ending at the Closing, the
Sponsor shall not modify or amend any Contract between or among Sponsor, anyone related by blood, marriage or adoption to the Sponsor or any affiliate of the Sponsor (other than SPAC and its Subsidiaries), on the one hand, and SPAC or any of
SPAC’s Subsidiaries, on the other hand. 

  

	4)	 As used herein, (i) “Beneficially Own” has the meaning ascribed to it in
Section 13(d) of the Exchange Act; and (ii) “Transfer” shall mean the (a) sale of, offer to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to purchase or otherwise dispose of or
agreement to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to or decrease of a call equivalent position within the meaning of the Exchange Act, and the rules and regulations
promulgated thereunder with respect to, any security, (b) entry into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any security, whether any such transaction is to
be settled by delivery of such securities, in cash or otherwise, or (c) public announcement of any intention to effect any transaction specified in clause (a) or (b); provided that the exercise of any Private Placement Warrant(s) or New
SPAC Warrants shall not constitute a “Transfer”. 

  

	5)	 This Sponsor Letter, the SPAC Letter Agreement, the Sponsor Side Letter, the Business Combination Agreement and
the other agreements referenced herein and therein constitute the entire agreement and understanding of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements, or representations by or among the
parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated hereby. This Sponsor Letter may not be changed, amended, modified or waived (other than to correct a typographical
error) as to any particular provision, except by a written instrument executed by all parties hereto. 

  
 3 

	6)	 Subject to, and conditioned upon, the occurrence of the Closing, to the fullest extent permitted by Law and the
SPAC Organizational Documents, each of Sponsor and Riverstone hereby irrevocably and unconditionally waives and agrees not to assert or perfect, and agrees to cause its controlled affiliates to waive and agree not to assert or perfect, any rights to
adjustment or other anti-dilution protection with respect to the rate that the New SPAC Class B Common Shares will convert into New SPAC Class A Common Shares pursuant to the Business Combination Agreement and the SPAC Organizational
Documents or any other adjustment or anti-dilution protections that arise in connection with the issuance of shares and the other transactions contemplated by the Business Combination Agreement. 

 

	7)	 No party hereto may, except as set forth herein, assign either this Sponsor Letter or any of its rights,
interests, or obligations hereunder, other than in conjunction with transfers permitted by paragraph 2, without the prior written consent of the other parties. 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 Sponsor Letter shall be binding on the Sponsor, Riverstone, SPAC, NewCo and the Company and their respective successors, heirs, personal representatives
and assigns and permitted transferees. 

  

	8)	 Nothing in this Sponsor Letter shall be construed to confer upon, or give to, any person or corporation other
than the parties hereto any right, remedy or claim under or by reason of this Sponsor Letter or of any covenant, condition, stipulation, promise or agreement hereof. All covenants, conditions, stipulations, promises and agreements contained in this
Sponsor Letter shall be for the sole and exclusive benefit of the parties hereto and their successors, heirs, personal representatives and assigns and permitted transferees. 

 

	9)	 This Sponsor Letter may be executed in any number of original, electronic or facsimile counterparts and each of
such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. 

  

	10)	 This Sponsor Letter shall be deemed severable, and the invalidity or unenforceability of any term or provision
hereof shall not affect the validity or enforceability of this Sponsor Letter or of any other term or provision hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added
as a part of this Sponsor Letter a provision as similar in terms to such invalid or unenforceable provision as may be possible and be valid and enforceable. 

  

	11)	 This Sponsor Letter, and all claims or causes of action based upon, arising out of, or related to this Sponsor
Letter or the transactions contemplated hereby, shall be governed by, and construed in accordance with, the Laws of the State of Delaware, without giving effect to principles or rules of conflict of laws to the extent such principles or rules would
require or permit the application of Laws of another jurisdiction. Any Action based upon, arising out of or related to this Sponsor Letter or the transactions contemplated hereby shall be heard and determined exclusively in any Court of Chancery of
the State of Delaware; provided, that if jurisdiction is not then available in a Court of Chancery of the State of Delaware, then any such Action may be brought in any federal court located in the State of Delaware or any other Delaware state
court, and each of the parties irrevocably submits to the exclusive jurisdiction of each such court in any such Action, waives any objection it may now or hereafter have to personal jurisdiction, venue or convenience of forum, agrees that all claims
in respect of the Action shall be heard and determined only in any such court, and agrees not to bring any Action arising out of or relating to this Sponsor Letter or the transactions contemplated hereby in any other court. Nothing herein contained
shall be deemed to affect the right of any party to serve process in any manner permitted by Law or to commence legal proceedings or otherwise proceed against any other party in any other jurisdiction, in each case, to enforce judgments obtained in
any Action brought pursuant to this paragraph. The prevailing party in any such Action (as determined by a court of competent jurisdiction) shall be entitled to be reimbursed by the non-prevailing party for
its reasonable expenses, including reasonable attorneys’ fees, incurred with respect to such Action. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY ACTION BASED UPON, ARISING OUT OF OR RELATED TO
THIS SPONSOR LETTER OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

  
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	12)	 Any notice, consent or request to be given in connection with any of the terms or provisions of this Sponsor
Letter shall be in writing and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery or facsimile or e-mail transmission.

  

	13)	 This Sponsor Letter shall terminate upon the earlier of (a) the expiration of each of the Warrants Lock-up Period and the Founder Shares Lock-up Period and (b) the termination of the Business Combination Agreement in accordance with its terms prior to the Closing;
provided, that the obligations of Sponsor or Riverstone, as the case may be, set forth in paragraph 1 shall terminate immediately following the Closing or upon the earlier termination of the Business Combination Agreement in accordance with its
terms prior to the Closing. 

  

	14)	 Each of the Sponsor and Riverstone hereby represents and warrants to SPAC and the Company as follows:
(i) it is duly organized, validly existing and in good standing under the Laws of the jurisdiction in which it is organized, and such party has all necessary power and authority to execute, deliver and perform this Sponsor Letter and consummate
the transactions contemplated hereby; (ii) this Sponsor Letter has been duly executed and delivered by such party and, assuming due authorization, execution and delivery by the other parties to this Sponsor Letter, this Sponsor Letter
constitutes a legally valid and binding obligation of such party, enforceable against such party in accordance with the terms hereof (except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’ rights and
general principles of equity affecting the availability of specific performance and other equitable remedies); (iii) the execution and delivery of this Sponsor Letter by such party does not, and the performance by the such party of its obligations
hereunder will not, (A) conflict with or result in a violation of the organizational documents of such party, or (B) require any consent or approval that has not been given or other action that has not been taken by any third party
(including under any Contract binding upon such party or such party’s SPAC Founder Shares or Private Placement Warrants, as applicable), in each case, to the extent such consent, approval or other action would prevent, enjoin or materially
delay the performance by such party of its obligations under this Sponsor Letter; (iv) there are no Actions pending against such party or, to the knowledge of such party, threatened against such party, before (or, in the case of threatened
Actions, that would be before) any arbitrator or any Governmental Authority, which in any manner challenges or seeks to prevent, enjoin or materially delay the performance by such party of its obligations under this Sponsor Letter; (v) except
for fees described on Section 4.11 of the SPAC Disclosure Schedule (solely as it relates to the Sponsor), no financial advisor, investment banker, broker, finder or other similar intermediary is entitled to any fee or commission from such party
or its controlled affiliates (excluding the Company) in connection with the Business Combination Agreement or the transactions contemplated thereby based upon any arrangement or agreement made by such party or its controlled affiliates (excluding
the Company) for which SPAC or any of its controlled affiliates or, following the Closing, the Company, NewCo, New SPAC or any of their controlled affiliates, would have any obligations or liabilities of any kind or nature; (vi) such party has
had the opportunity to read the Business Combination Agreement and this Sponsor Letter and has had the opportunity to consult with its tax and legal advisors; (vii) such party has not entered into, and shall not enter into, any agreement that
would restrict, limit or interfere with the performance of such party’s obligations hereunder; (viii) such party has, or will have after completion of the Sponsor Group Transfer, good title to all such SPAC Founder Shares and Private
Placement Warrants, and there exist no Liens or any other limitation or restriction (including, without limitation, any restriction on the right to vote, sell or otherwise dispose of such SPAC Founder Shares or Private Placement Warrants) affecting
any such SPAC Founder Shares or Private Placement Warrants, other than pursuant to (A) this Sponsor Letter, (B) the SPAC Organizational Documents, (C) the Sponsor Side Letter, (D) the Business Combination Agreement, (E) the
Amended and Restated Limited Liability Company Agreement of the Sponsor, (F) the SPAC Letter Agreement or (G) any applicable securities Laws; (x) the Sponsor Equity are the only SPAC Founder Shares, Private Placement Warrants or other
equity securities of SPAC Beneficially Owned by the Sponsor as of the date hereof and (xi) Riverstone does not Beneficially Own any SPAC Founder Shares, Private Placement Warrants or other equity securities of SPAC as of the date hereof.

  
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	15)	 Each of the Sponsor and Riverstone hereby agrees and acknowledges that: (i) SPAC and, prior to any valid
termination of the Business Combination Agreement, the Company would be irreparably injured in the event of a breach by the Sponsor or Riverstone, as the case may be, of its obligations under paragraphs 1 and 2, as applicable, of this Sponsor
Letter, (ii) monetary damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to seek injunctive relief, in addition to any other remedy that such
party may have in Law or in equity, in the event of such breach. The Sponsor or Riverstone, as the case may be, shall also be entitled to seek injunctive relief, in addition to any other remedy that such parties may have in Law or in equity, in the
event of a breach under this Sponsor Letter. 

  

	16)	 If, and as often as, (a) there is any share split, share dividend, combination or reclassification that
results in the Sponsor or Riverstone acquiring new SPAC Founder Shares, SPAC Class A Ordinary Shares, Private Placement Warrants or other equity securities of SPAC, (b) the Sponsor or Riverstone purchases or otherwise acquires Beneficial
Ownership of any SPAC Founder Shares, SPAC Class A Ordinary Shares, Private Placement Warrants or other equity securities of SPAC after the date of this Sponsor Letter, or (c) Sponsor or Riverstone acquires the right to vote or share in
the voting of any SPAC Founder Shares, SPAC Class A Ordinary Shares or other equity securities of SPAC after the date of this Sponsor Letter, then, in each case, such SPAC Founder Shares, SPAC Class A Ordinary Shares, Private Placement
Warrants and other equity securities of SPAC, as applicable, acquired or purchased by the Sponsor or Riverstone shall be subject to the terms of this Sponsor Letter; provided, however, that the terms of paragraph 2 shall only apply to
SPAC Founder Shares and Private Placement Warrants. 

  

	17)	 Each of the parties hereto agrees to execute and deliver hereafter any further document, agreement or
instrument of assignment, transfer or conveyance as may be necessary or desirable to effectuate the purposes hereof and as may be reasonably requested in writing by another party hereto. 

[Signature page follows.] 

  
 6 

 
			
	 Sincerely,

	
	DECARBONIZATION PLUS ACQUISITION SPONSOR IV LLC
		
	 By:
	 	 /s/ Peter Haskopoulos

	 Name:
	 	 Peter Haskopoulos

	 Title:
	 	 Officer

	
	RIVERSTONE GLOBAL ENERGY AND POWER FUND V (CAYMAN), L.P.
	By: Riverstone Energy Partners V (Cayman), L.P., its general partner
	By: Riverstone GP V Cayman LLC, its general partner
		
	 By:
	 	 /s/ Peter Haskopoulos

	 Name:
	 	 Peter Haskopoulos

	 Title:
	 	Authorized Person

  

			
	 Acknowledged and Agreed:

	
	DECARBONIZATION PLUS ACQUISITION CORPORATION IV
		
	 By:
	 	 /s/ Peter Haskopoulos

	Name:	 	Peter Haskopoulos
	Title:	 	Chief Financial Officer, Chief Accounting Officer and Secretary

  

			
	 Acknowledged and Agreed:

	
	HAMMERHEAD RESOURCES INC.
		
	 By:
	 	 /s/ Michael Kohut

	 Name:
	 	 Michael Kohut

	 Title:
	 	Senior Vice President and Chief Financial Officer

  
 7 

			
	 Acknowledged and Agreed:

	
	HAMMERHEAD ENERGY INC.
		
	 By:
	 	 /s/ Michael Kohut

	 Name:
	 	 Michael Kohut

	 Title:
	 	Senior Vice President and Chief Financial Officer

  
 8EX-10.3

 Exhibit 10.3 

SUPPORT AGREEMENT 
 THIS SUPPORT AGREEMENT
is made effective as of September 25, 2022 
 BETWEEN: 

DECARBONIZATION PLUS ACQUISITION CORPORATION IV, a Cayman Islands exempted company (“SPAC”) 

- and – 
 HAMMERHEAD
RESOURCES INC., an Alberta corporation (the “Company”) 
 - and – 

[SECURITYHOLDER] (the ”Securityholder”) 

WHEREAS concurrently with the execution and delivery of this Agreement, SPAC, the Company, Hammerhead Energy Inc.
(“NewCo”) and 2453729 Alberta ULC (“AmalCo”) have entered into a business combination agreement (the ”Business Combination Agreement”) regarding a proposed arrangement under section 193 of
the Business Corporations Act (Alberta) pursuant to which, among other things: (a) SPAC shall transfer by way of continuation from the Cayman Islands to Alberta and domesticate as an Alberta corporation and shall subsequently amalgamate
with NewCo to form New SPAC; (b) the Company shall effect the Company Warrant Settlement; (c) the Company shall merge with AmalCo; (d) each Company Preferred Share outstanding shall be exchanged for New SPAC Class A Common Shares
based on the applicable exchange ratio provided in the Plan of Arrangement; (e) each Company RSU and each Company Option then outstanding shall be exchanged for an option to acquire New SPAC Class A Common Shares based on the applicable
exchange ratio provided in the Plan of Arrangement and (f) each Company Common Share outstanding after the Company Warrant Settlement shall be exchanged for New SPAC Class A Common Shares based on the applicable exchange ratio provided in
the Plan of Arrangement (the “Arrangement”); 
 AND WHEREAS the Securityholder beneficially owns, or exercises
control or direction over, the Company Common Shares, the Company Preferred Shares, the Company Warrants, the Company Options and/or the Company RSUs set out in Schedule A hereto; 

AND WHEREAS the Securityholder understands and acknowledges that SPAC and the Company are entering into the Business Combination
Agreement in reliance upon the execution and delivery of this Agreement by the Securityholder and the terms and conditions contained herein and, in consideration for SPAC and the Company entering into the Business Combination Agreement and agreeing
to the provisions of this Agreement, the Securityholder agrees to be bound by this Agreement, which sets out the terms and conditions upon which it has agreed, among other things, to support the Arrangement and to cause its Subject Securities to be
voted in favour of the Arrangement; 
 NOW THEREFORE, in consideration of the foregoing and the covenants and agreements herein
contained and other good and valuable consideration (the receipt and sufficiency of which are hereby acknowledged by each of the Parties), the Parties covenant and agree as follows: 

	1.	 Definitions 

In this Agreement, any capitalized term used herein and not defined in this Section 1 shall have the meaning ascribed thereto in the Business Combination
Agreement or the Plan of Arrangement, as applicable. Unless the context otherwise requires, the following words and phrases used in this Agreement (including the recitals hereto) shall have the meanings hereinafter set out: 

“Agreement” means this support agreement, as amended, supplemented or modified from time to time; 

“AmalCo” has the meaning ascribed thereto in the recitals to this Agreement; 

“Arrangement” has the meaning ascribed thereto in the recitals to this Agreement; 

“Business Combination Agreement” has the meaning ascribed thereto in the recitals to this Agreement; 

“Company” has the meaning ascribed thereto in the recitals to this Agreement; 

“NewCo” has the meaning ascribed thereto in the recitals to this Agreement; 

“Party” means a party to this Agreement, and “Parties” means all parties to this Agreement; 

“Relevant Securities” means Company Common Shares, Company Preferred Shares, Company Warrants, Company Options, Company RSUs and, if
applicable after the date hereof, any other securities of the Company having voting rights in respect of the Arrangement under applicable Law; 

“Securityholder” has the meaning ascribed thereto in the recitals to this Agreement; 

“SPAC” has the meaning ascribed thereto in the recitals to this Agreement; and 

“Subject Securities” means all Relevant Securities beneficially owned, or over which control or direction is exercised by the Securityholder,
including any Relevant Securities that the Securityholder acquires beneficial ownership of, or control or direction over, after the date hereof. 
  

	2.	 Securityholder Covenants 

Subject to the terms and conditions of this Agreement, the Securityholder hereby covenants and agrees, solely in the Securityholder’s capacity as
securityholder of the Company and not in the Securityholder’s capacity as an officer or director of the Company, if applicable, with SPAC and the Company that, unless otherwise consented to in writing by SPAC and the Company the Securityholder
shall: 
  

	(a)	 vote (or cause to be voted) all Subject Securities at any meeting of Company Shareholders called to vote on any
of the matters described in clauses (i), (ii) or (iii) below (and any other meeting of holders of any other Relevant Securities, as applicable, at which the Securityholder is entitled to vote in respect of any of the matters described in
clauses (i), (ii) or (iii) below), including the Company Shareholders Meeting: (i) for and in favour of the Arrangement Resolution and any other matter necessary for the consummation of the Arrangement; (ii) other than as contemplated
in paragraph (i), against any business combination, arrangement, amalgamation, merger, consolidation, reorganization, recapitalization, liquidation, dissolution, winding-up, material asset sale or similar
transaction involving the Company, or any issue of securities by the Company, or any resolution to approve, ratify or adopt any of the foregoing; and (iii) against any resolution, transaction or other action that is inconsistent with, or could
reasonably be likely to impede, interfere with, delay, postpone, or adversely affect the Arrangement or any of the other matters and transactions contemplated by the Business Combination Agreement, including against any Alternative Transaction in
respect of the Company, and, in each case, cause the Subject Securities to be counted as present at the Company Shareholders Meeting and any such other meeting of holders of any other Relevant Securities in respect of any of the matters described in
clauses (i), (ii) or (iii) above, as applicable, for quorum purposes; 

  
 - 2 - 

	(b)	 without limiting paragraph 2(a): (i) duly deposit or deliver (or cause to be duly deposited or delivered) valid
proxies, duly completed and executed, in respect of the Subject Securities, at least seven (7) calendar days prior to the Company Shareholders Meeting, directing that all of the Subject Securities, as applicable, be voted in favour of the
Arrangement Resolution and any other matter necessary for the consummation of the Arrangement; (ii) upon the SPAC’s written request, provide SPAC with confirmation of the deposit or delivery of valid proxies as aforesaid; and
(iii) not take (or permit any Person on its behalf to take) any action to withdraw, amend or invalidate any proxy deposited or delivered pursuant to this Agreement; 

 

	(c)	 not sell, transfer, gift, assign, convey, pledge, hypothecate, encumber, grant a security interest in or
option, or enter into any derivative transactions in respect of, or otherwise dispose of any right or interest (including any economic consequence of ownership) in, any of the Subject Securities, or enter into any agreement, arrangement or
understanding in connection therewith other than pursuant to the Arrangement prior to the Closing or the termination of the Business Combination Agreement in accordance with the terms thereof, provided that: (i) the foregoing restriction shall
not prevent the Securityholder from converting or exercising any of the Subject Securities in accordance with their terms; and (ii) the Securityholder may sell, gift, transfer, assign or convey any or all of the Subject Securities (to the
extent permitted by the terms of the applicable Subject Securities) to an Affiliate or associate (as defined in the Securities Act (Alberta)) of the Securityholder, provided that such Affiliate or associate enters into an agreement with SPAC
on the same terms as this agreement, or otherwise agrees with SPAC to be bound by the provisions hereof; 

  

	(d)	 not: (i) grant or agree to grant any proxy, power of attorney or other right to vote any of the Subject
Securities, deposit any of its Subject Securities into a voting trust or pooling agreement, or enter into any agreement, arrangement or understanding with respect to the voting of any of its Subject Securities, that is inconsistent with, or would
interfere with or prohibit or prevent the Securityholder from satisfying its obligations provided in, this Agreement; (ii) deposit or tender (or permit to be deposited or tendered) any securities of the Company to any take-over bid or other
Alternative Transaction in respect of the Company; or (iii) requisition or join in the requisition of any meeting of the Company Shareholders or the holders of any other Relevant Securities; 

 

	(e)	 not: (i) take any action, that opposes or competes with, or could reasonably be expected to frustrate,
impede, interfere with, delay, postpone, restrain, prevent or adversely affect the Arrangement or any of the other matters and transactions contemplated by the Business Combination Agreement; or (ii) act jointly or in concert with any Person or
group of Persons with respect to voting securities of the Company or SPAC in opposition to or competition with the Arrangement or any of the other matters and transactions contemplated by the Business Combination Agreement, or in support of any
Alternative Transaction in respect of the Company; 

  
 - 3 - 

	(f)	 not exercise or assert (or permit to be exercised or asserted on its behalf): (i) any Company Dissent Rights or
any other rights of dissent or appraisal with respect to the Subject Securities in respect of the Arrangement or the Arrangement Resolution, all of which rights are hereby irrevocably waived by the Securityholder to the fullest extent permitted by
Law; or (ii) any other rights or remedies with respect to the Subject Securities that are available pursuant to applicable Law that could reasonably be expected to frustrate, impede, interfere with, delay, postpone, restrain, prevent or
adversely affect the Arrangement or any of the other matters and transactions contemplated by the Business Combination Agreement; 

  

	(g)	 not: (i) withdraw, amend, modify or qualify, or publicly propose or state any intention to withdraw,
amend, modify or qualify, its support for the Arrangement or any of the other matters and transactions contemplated by the Business Combination Agreement; or (ii) accept, approve, endorse, recommend or enter into, or publicly propose or state
any intention to accept, approve, endorse, recommend or enter into, any publicly disclosed Alternative Transaction in respect of the Company, or make or enter into any agreement, arrangement or understanding, written or oral, in respect of an
Alternative Transaction in respect of the Company; 

  

	(h)	 not: (i) solicit any proxies, or participate in any solicitation of proxies, with respect to the voting of
any securities of the Company other than in favour of the Arrangement Resolution and the other matters and transactions contemplated by the Business Combination Agreement; or (ii) make any announcement or public disclosure with respect to any
of the matters in this paragraph 2(h), except to the extent required by applicable Law; 

  

	(i)	 immediately cease all solicitations, encouragements, discussions, negotiations or other activities (including
through any Affiliate or Representative), if any, with any Person other than SPAC and its Representatives, with respect to any Alternative Transaction in respect of the Company or expression of interest relating to an Alternative Transaction in
respect of the Company, or any inquiry, proposal or offer that constitutes or would reasonably be expected to lead to, an Alternative Transaction in respect of the Company; 

 

	(j)	 not take or omit to take any action that would cause any of its representations or warranties set forth in
Section 3 to become untrue or incorrect in any material respect, and promptly notify SPAC if any of its representations and warranties contained herein becomes untrue or incorrect in any material respect; 

 

	(k)	 not act jointly or in concert or otherwise knowingly cooperate in any way with, or assist (including by
providing financial assistance), facilitate, encourage or participate in, any effort or attempt by any other Person or group of Persons to do or seek to do anything contrary to the foregoing; and 

 

	(l)	 not do indirectly, including through any Affiliate or Representative, that which it may not do directly by the
terms of this Section 2, provided that for certainty any actions by any Representative of the Securityholder who is a director of the Company which are taken or omitted from being taken in such Representative’s capacity as a director of
the Company shall not be deemed or interpreted to be indirect actions of the Securityholder hereunder. 

  
 - 4 - 

	3.	 Securityholder Representations and Warranties 

The Securityholder represents and warrants to SPAC and the Company as follows, and acknowledges that SPAC is relying upon such representations and warranties
in connection with the matters contemplated by this Agreement: 
  

	(a)	 the Securityholder has all necessary power, authority, right and capacity to execute and deliver this
Agreement, and to perform its obligations hereunder and complete the transactions contemplated hereby; 

  

	(b)	 this Agreement has been duly executed and delivered by the Securityholder and constitutes a legal, valid and
binding agreement of the Securityholder enforceable against it in accordance with its terms, except as enforcement may be limited by bankruptcy, insolvency and other laws affecting the rights of creditors generally and except that equitable remedies
such as specific performance and injunction may be granted only in the discretion of a court of competent jurisdiction; 

  

	(c)	 none of the execution, delivery or performance of this Agreement by the Securityholder, or completion of the
transactions contemplated hereby, violates or constitutes a breach or default under, or conflicts with (or would with the giving of notice, the lapse of time or the happening of any other event or condition violate or constitute a breach or default
under, of conflict with), any governing documents of the Securityholder or pursuant to any applicable Law, to which the Securityholder is bound, except in each case as would not impair the ability of the Securityholder to perform its obligations
hereunder; 

  

	(d)	 as of the date hereof, the Securityholder beneficially owns, and exercises control and direction over the
number of Subject Securities set forth opposite its name on Schedule A hereto; 

  

	(e)	 as of the date hereof, the Securityholder has the sole and exclusive right to sell and vote or direct the sale
and voting of the Subject Securities set forth on Schedule A hereto; 

  

	(f)	 none of the Subject Securities are subject to any shareholders’ agreement, voting trust, pooling agreement
or similar agreement, commitment, understanding or arrangement, or any right or privilege (by Law or contract) capable of becoming a shareholders’ agreement, voting trust, pooling agreement or similar agreement, commitment, understanding or
arrangement, in each case, that are inconsistent with, or would interfere with, or prohibit or prevent it from satisfying its obligations pursuant to, this Agreement; 

 

	(g)	 there is no proxy in existence with respect to any of the Subject Securities; 

 

	(h)	 no Person has, or to the knowledge of the Securityholder, will at any time during the term of this Agreement
have, any agreement or option, or any right or privilege (by Law or contract) capable of becoming an agreement or option, for the purchase, acquisition or transfer of any of the Subject Securities, or any interest therein or right thereto (including
any right to vote), other than pursuant to this Agreement and the Business Combination Agreement; and 

  

	(i)	 as of the date hereof, there is no claim, action, lawsuit or other legal proceeding in progress or pending or,
to the knowledge of the Securityholder, threatened against it that adversely affects the Securityholder’s ability to enter into this Agreement and perform its obligations hereunder, or its title to any of the Subject Securities.

  
 - 5 - 

	4.	 Representations and Warranties of SPAC 

SPAC represents and warrants to the Securityholder as follows, and acknowledges that the Securityholder is relying upon such representations and warranties in
connection with the matters contemplated by this Agreement: 
  

	(a)	 SPAC has all necessary power, authority, right and capacity to execute and deliver this Agreement, and to
perform its obligations hereunder and complete the transactions contemplated hereby; 

  

	(b)	 this Agreement has been duly executed and delivered by SPAC and constitutes a legal, valid and binding
agreement of SPAC enforceable against it in accordance with its terms, except as enforcement may be limited by bankruptcy, insolvency and other laws affecting the rights of creditors generally and except that equitable remedies such as specific
performance and injunction may be granted only in the discretion of a court of competent jurisdiction; 

  

	(c)	 none of the execution, delivery or performance of this Agreement by SPAC, or completion of the transactions
contemplated hereby, violates or constitutes a breach or default under, or conflicts with (or would with the giving of notice, the lapse of time or the happening of any other event or condition violate or constitute a breach or default under, of
conflict with) any articles, by-laws, agreement, arrangement, deed, indenture, understanding or restriction of any kind, including pursuant to any applicable Law, to which SPAC is a party or by which it is
bound, except in each case as would not impair the ability of SPAC to perform its obligations hereunder; and 

  

	(d)	 there is no claim, action, lawsuit or other legal proceeding in progress or pending or, to the knowledge of
SPAC, threatened against it or any of its affiliates that adversely affects SPAC’s ability to enter into this Agreement and perform its obligations hereunder. 

 

	5.	 Representations and Warranties of the Company 

The Company represents and warrants to the Securityholder as follows, and acknowledges that the Securityholder is relying upon such representations and
warranties in connection with the matters contemplated by this Agreement: 
  

	(a)	 the Company has all necessary power, authority, right and capacity to execute and deliver this Agreement, and
to perform its obligations hereunder and complete the transactions contemplated hereby; 

  

	(b)	 this Agreement has been duly executed and delivered by the Company and constitutes a legal, valid and binding
agreement of the Company enforceable against it in accordance with its terms, except as enforcement may be limited by bankruptcy, insolvency and other laws affecting the rights of creditors generally and except that equitable remedies such as
specific performance and injunction may be granted only in the discretion of a court of competent jurisdiction; 

  

	(c)	 none of the execution, delivery or performance of this Agreement by the Company, or completion of the
transactions contemplated hereby, violates or constitutes a breach or default under, or conflicts with (or would with the giving of notice, the lapse of time or the happening of any other event or condition violate or constitute a breach or default
under, of conflict with) any articles, by-laws, agreement, arrangement, deed, indenture, understanding or restriction of any kind, including pursuant to any applicable Law, to which the Company is a party or
by which it is bound, except in each case as would not impair the ability of the Company to perform its obligations hereunder; and 

  

	(d)	 there is no claim, action, lawsuit or other legal proceeding in progress or pending or, to the knowledge of the
Company, threatened against it or any of its affiliates that adversely affects the Company’s ability to enter into this Agreement and perform its obligations hereunder 

  
 - 6 - 

	6.	 Termination 

This Agreement and the Parties’ respective rights and obligations hereunder shall terminate on the earliest of: 

 

	(a)	 the mutual written consent of SPAC, the Company and the Securityholder, by instrument in writing signed by each
Party, to terminate this Agreement; 

  

	(b)	 notice being delivered by the Securityholder to SPAC and the Company if, following the date of this Agreement
and without the prior written consent of the Securityholder, there is any amendment or modification to the Business Combination Agreement and the Arrangement that materially adversely affects the Securityholder, including, but not limited to, any
amendment or modification (whether or not materially adverse to the Securityholder) to decrease the amount of, or change the form of, the consideration payable for the Subject Securities as set out in the Arrangement; 

 

	(c)	 the time (if any) at which the Business Combination Agreement is terminated in accordance with the terms
thereof; and 

  

	(d)	 the Closing. 

Upon termination or expiration of this Agreement, as applicable, neither Party shall have any further obligations or liabilities under this Agreement,
provided, however, that: (i) the provisions of Sections 7-16 and 19, inclusive, shall survive termination of this Agreement, and (ii) nothing herein shall relieve a Party from liability for any
breach of this Agreement that occurs prior to termination, or prejudice the rights of the other Parties as a result of any such breach. For the avoidance of doubt, the representations and warranties of the Securityholder and SPAC set forth in
Sections 3 and 4 hereof shall not survive the termination of this Agreement. 
 SPAC (and New SPAC as its successor) agree that the Securityholder is an
intended third party beneficiary of the provision in Section 6.13 (Intended Tax Treatment) of the Business Combination Agreement and confirms that the obligations in Section 6.13 (Intended Tax Treatment) of the Business Combination
Agreement that are to be performed post-Closing shall survive for the period set forth in the Business Combination Agreement. 
  

	7.	 Shares Subject to Plan of Arrangement 

The Securityholder understands and acknowledges that, in accordance with the Plan of Arrangement: (i) all Subject Securities will be exchanged for
new securities of New SPAC (the “New SPAC Securities”); and (ii) the Securityholder will become bound by a lock-up agreement, substantially in the form attached to the Arrangement
Agreement, pursuant to which, among other things, the Securityholder will not be able to transfer such New SPAC Securities during the period commencing on the Closing Date and ending on the earlier of: (x) the date that is six (6) months
following the Closing Date; and (y) the date that the last sale price of the New SPAC Class A Common Shares equals or exceeds US$12.00 per share (as adjusted for share subdivisions, share dividends, reorganizations, recapitalizations and
the like) for any 20 trading days within any 30-day trading period. 

  
 - 7 - 

	8.	 Remedies 

The Parties acknowledge and agree that if any provision of this Agreement were not performed in accordance with the specific terms hereof or are otherwise
breached, the non-breaching Parties would suffer irreparable harm for which monetary damages would not be an adequate remedy, and, accordingly, that the Parties shall be entitled to equitable relief, including
remedies of specific performance and temporary and permanent injunctive relief to enforce performance and/or restrain any actual or threatened non-performance or other breach of the terms and provisions hereof
without proof of actual damages or otherwise, in addition to any other remedy to which they are entitled at Law or in equity as expressly permitted in this Agreement. Each of the Parties hereby further waives: (a) any defense in any action for
specific performance that a remedy at Law would be adequate; and (b) any requirement under any Law to post security or a bond as a prerequisite to obtaining equitable relief. 

 

	9.	 Notices 

All notices, requests, claims, demands and other communications hereunder shall be in writing and shall be given (and shall be deemed to have been duly given
upon receipt) by delivery in person, by email or by registered or certified mail (postage prepaid, return receipt requested) to the respective Parties at the following addresses (or at such other address for a Party as shall be specified in a notice
given in accordance with this Section 8): 
  

	(a)	 if to the Securityholder: 

[__] 
  

	(b)	 if to SPAC: 

Decarbonization Plus Acquisition Corporation IV 

2744 Sand Hill Road 
 Menlo Park,
CA 
 (212) 993-0076 

Attention: Erik Anderson, Peter Haskopoulos and Robert Tichio 

Email: erik@wrg.vc, phaskopoulos@riverstonellc.com, rtichio@riverstonellc.com 

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

Vinson & Elkins L.L.P. 

1114 Avenue of the Americas 
 32nd Floor 
 New York, NY 10036 

Attention: Dan Komarek 
 Email:
dkomarek@velaw.com 
 and 

Vinson & Elkins L.L.P. 

845 Texas Avenue 
 Suite 4700 

Houston, TX 77002 
 Attention:
Ramey Layne 
 Email: rlayne@velaw.com 

  
 - 8 - 

 and 

Bennett Jones LLP 
 4500, 855-2nd Street SW 
 Calgary, Alberta T2P 4K7 

Attention: John Mercury; John Lawless 

Email: MercuryJ@bennettjones.com; LawlessJ@bennettjones.com 
  

	(c)	 if to the Company: 

Hammerhead Resources Inc. 
 2700,
525 8 Avenue SW 
 Calgary, Alberta T2P 1G1 

Attention: Scott Sobie, President and Chief Executive Officer 

Email: SSobie@hhres.com 
 with a
copy to (which shall not constitute notice): 
 Burnet, Duckworth & Palmer LLP 

2400, 525 8 Avenue SW 
 Calgary,
Alberta T2P 1G1 
 Attention: Bill Maslechko; Lindsay Cox 

Email: ws@bdplaw.com; lpc@bdplaw.com 

and 
 Paul, Weiss, Rifkind,
Wharton & Garrison LLP 
 1285 Avenue of the Americas 

New York, New York 10019 

Attention: Adam M. Givertz; Ian M. Hazlett 

Email: agivertz@paulweiss.com; ihazlett@paulweiss.com 
  

	10.	 Interpretation 

 

	(a)	 Unless the context of this Agreement otherwise requires: (i) words of any gender include each other
gender; (ii) words using the singular or plural number also include the plural or singular number, respectively; (iii) the definitions contained in this Agreement are applicable to the other grammatical forms of such terms; (iv) the
terms “hereof”, “herein”, “hereby”, “hereto” and derivative or similar words refer to this entire Agreement; (v) the terms “Article”, “Section” and “Schedule” refer to the
specified Article, Section, or Schedule of or to this Agreement; (vi) the word “including” means “including without limitation”; (vii) the word “or” shall be disjunctive but not exclusive;
(viii) references to agreements and other documents shall be deemed to include all subsequent amendments and other modifications thereto; and (ix) references to any Law shall include all rules and regulations promulgated thereunder and
references to any Law shall be construed as including all statutory, legal, and regulatory provisions consolidating, amending or replacing such Law. 

  

	(b)	 All references to “$” or dollars refer to United States dollars. 

 

	(c)	 The language used in this Agreement shall be deemed to be the language chosen by the Parties to express their
mutual intent and no rule of strict construction shall be applied against any Party. 

  
 - 9 - 

	(d)	 The descriptive headings contained in this Agreement are included for convenience of reference only and shall
not affect in any way the meaning or interpretation of this Agreement. 

  

	(e)	 Whenever this Agreement refers to a number of days, such number shall refer to calendar days unless Business
Days are specified, and when counting days, the date of commencement will not be included as a full day for purposes of computing any applicable time periods (except as otherwise may be required under any applicable Law). If any action is to be
taken or given on or by a particular calendar day, and such calendar day is not a Business Day, then such action may be deferred until the next Business Day. 

 

	11.	 Severability 

If any term or other provision of this Agreement is held to be invalid, illegal or incapable of being enforced by any rule of Law, or public policy, in whole
or in part, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance of this Agreement is not affected in any manner materially adverse to any Party. Upon
such determination that any term or other provision is invalid, illegal or incapable of being enforced, the Parties shall negotiate in good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in a
mutually acceptable manner. 
  

	12.	 Entire Agreement; Assignment 

This Agreement constitutes the entire agreement among the Parties with respect to the subject matter hereof and supersedes all prior and contemporaneous
agreements and undertakings, both written and oral, among the Parties, or any of them, with respect to the subject matter hereof. No Party may assign, grant or otherwise transfer the benefit of the whole or any part of this Agreement or any of the
rights hereunder (whether pursuant to a merger, by operation of Law or otherwise) to any Person without the prior express written consent of the other Parties. 
  

	13.	 Amendment 

This Agreement may not be amended, modified or supplemented except by an instrument in writing signed by each of the Parties, and any attempt to make such
amendment, modification or supplement without an instrument in writing signed by each of the Parties shall be null and void. 
  

	14.	 Parties in Interest 

This Agreement shall be binding upon and inure solely to the benefit of each Party, and nothing in this Agreement, express or implied, is intended to or shall
confer upon any other Person any right, benefit or remedy of any nature whatsoever under or by reason of this Agreement. 
  

	15.	 Governing Law 

This Agreement shall be governed by, and construed in accordance with, the laws of the Province of Alberta. All legal actions and proceedings arising out of or
relating to this Agreement shall be heard and determined exclusively in the Alberta Court of Queen’s Bench. The Parties hereby (a) irrevocably submit to the exclusive jurisdiction of the aforesaid courts for themselves and with respect to
their respective properties for the purpose of any Action arising out of or relating to this Agreement brought by any Party, and (b) agree not to commence any Action relating thereto except in the courts described above in Alberta, other than
Actions in any court of competent jurisdiction to enforce any judgment, decree or award rendered by any such court in Alberta as described herein. Each of the Parties further agrees that notice as provided herein shall constitute sufficient service
of process and the Parties further waive any argument that such service is insufficient. Each of the Parties hereby irrevocably and unconditionally waives, and agrees not to assert, by way of motion or as a defense, counterclaim or otherwise, in any
Action arising out of or relating to this Agreement or the transactions contemplated hereby, (a) any claim that it is not personally subject to the jurisdiction of the courts in Alberta as described herein for any reason, (b) that it or
its property is exempt or immune from jurisdiction of any such court or from any legal process commenced in such courts (whether through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of
judgment or otherwise) and (c) that (i) the Action in any such court is brought in an inconvenient forum, (ii) the venue of such Action is improper or (iii) this Agreement, or the subject matter hereof, may not be enforced in or by
such courts. 

  
 - 10 - 

	16.	 Costs and Expenses 

Except to the extent set forth in the Business Combination Agreement, each Party shall bear and be solely responsible for the fees, charges and disbursements
of its respective financial, legal and other advisors, and all other costs and expenses of any nature or kind whatsoever, howsoever incurred, in connection with the preparation, execution, delivery and performance of this Agreement and completion of
the transactions contemplated hereby and by the Business Combination Agreement. 
  

	17.	 Disclosure 

  

	(a)	 The Securityholder agrees to promptly provide SPAC and the Company with any information pertaining to the
Securityholder that SPAC or the Company may reasonably require for the preparation of any news release or disclosure document (including, without limitation, in connection with the SPAC Shareholders Meeting or the Company Shareholders Meeting, as
the case may be) required to be filed by SPAC or the Company with any Governmental Authority in connection with the matters contemplated by this Agreement and to promptly notify SPAC and the Company of any required corrections to any such
information provided by the Securityholder for use in any such disclosure document, if and to the extent that any such information shall have become false or misleading in any material respect. Except as required by applicable Law, no Party shall
make any public announcement or statement with respect to this Agreement without the consent of the other Parties, which shall not be unreasonably withheld, conditioned or delayed. 

 

	(b)	 The Securityholder irrevocably and unconditionally consents to the public disclosure by SPAC and the Company:
(i) of the existence of this Agreement, pursuant to applicable Law and the Court proceedings to be commenced under section 193 of the ABCA in respect of the Arrangement; (ii) of the details of this Agreement being set out in the news
release announcing the entering into of the Business Combination Agreement, any documents filed by SPAC or the Company pursuant to applicable Law and materials filed with the Court; and (iii) to this Agreement being filed on the Electronic Data
Gathering, Analysis, and Retrieval system (EDGAR) and on the System for Electronic Document Analysis and Retrieval (SEDAR) pursuant to applicable Law, and with the Court. 

 

	18.	 Fiduciary Duties 

SPAC and the Company hereby agree and acknowledge that the Securityholder is bound hereunder solely in his capacity as a securityholder of the Company and that
the provisions hereof shall not be deemed or interpreted to bind the Securityholder in his capacity as a director or officer of the Company (if the Securityholder holds such office) or restrict, limit or prohibit the Securityholder in his capacity
as a director or officer of the Company (if the Securityholder holds such office) from fulfilling or exercising his fiduciary duties as a director or officer owing to the Company under applicable laws. 

  
 - 11 - 

	19.	 Counterparts 

This Agreement may be executed and delivered (including executed manually or electronically via DocuSign or other similar services and delivered by facsimile
or portable document format (pdf) transmission) in one or more counterparts, and by the different Parties in separate counterparts, each of which when executed shall be deemed to be an original but all of which taken together shall constitute one
and the same agreement. 
 [Signature Page Follows] 

  
 - 12 - 

 IN WITNESS WHEREOF the Parties have caused this Agreement to be executed as of the date first written above
by their respective officers thereunto duly authorized. 
  

			
	DECARBONIZATION PLUS ACQUISITION CORPORATION IV
		
	By:	 	
                     

	Name:	 	  

	Title:	 	  

	
	HAMMERHEAD RESOURCES INC.
		
	By:	 	              

	Name:	 	  

	Title:	 	  

  

			
	SECURITYHOLDER
		
	By:	 	
                 

	Name:	 	  

	Title:	 	  

 SCHEDULE A 

SUBJECT SECURITIES 
  

			
	Name of Registered Securityholder/Securityholder:
	
	  

	
	Number of Subject Securities Held:

  

			
	  
	  	Company Common Shares
		
	  
	  	Company Series I Preferred Shares
		
	  
	  	Company Series II Preferred Shares
		
	  
	  	Company Series III Preferred Shares
		
	  
	  	Company Series IV Preferred Shares
		
	  
	  	Company Series VI Preferred Shares
		
	  
	  	Company Series VII Preferred Shares
		
	  
	  	Company Series VIII Preferred Shares
		
	  
	  	Company Series IX Preferred Shares
		
	  
	  	Company 2013 Warrants
		
	  
	  	Company 2020 Warrants
		
	  
	  	Company Options

  

			
	Address for Notice:	  	
	
	  

	
	  

	
	  

		
	Telephone:	  	  

		
	Email:

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