Document:

Exhibit

	
			
	 
	 
	Exhibit 10.1

COOPERATION AGREEMENT

This Cooperation Agreement (“Agreement”) is entered into as of June 18, 2020, by and between Spôk Holdings, Inc., a Delaware corporation (the “Company”), and White Hat Strategic Partners LP, a Delaware limited partnership, White Hat SP GP LLC, a Delaware limited liability company, White Hat Capital Partners LP, a Delaware limited partnership, and White Hat Capital Partners GP LLC, a Delaware limited liability company (collectively, the “White Hat Parties”) (each of the Company and the White Hat Parties, a “Party” to this Agreement, and collectively, the “Parties”).
RECITALS
WHEREAS, the White Hat Parties have voting power or sole dispositive power or otherwise have beneficial ownership of 319,708 shares (the “Current Position”) of the common stock, par value $0.0001 per share, of the Company (the “Common Stock”) as of the date of this Agreement; and
WHEREAS, as of the date of this Agreement, the Company and the White Hat Parties have determined to come to an agreement with respect to certain matters set forth below; and
NOW, THEREFORE, in consideration of the foregoing premises and the mutual covenants and agreements contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the Parties to this Agreement, intending to be legally bound, agree as follows:
		
	1.
	Board Nominations; Certain Information.

(a)Brett Shockley (the “New Director”) has provided the Company with responses to a Director and Officer Questionnaire customarily used for NASDAQ-listed companies and certain biographical information in compliance with Item 401 of Regulation S-K as promulgated by the Securities and Exchange Commission (the “SEC”) (collectively, the “Information”), has executed all documents required to be executed by directors of the Company, and has cooperated with a background check.
(b)Based on the Information, the Nominating and Governance Committee (the “Nominating Committee”) of the Board of Directors (the “Board”) of the Company and the Board have determined that the New Director may serve as an “independent” director of the Company in accordance with the rules and listing standards of the NASDAQ National Market and applicable rules and regulations of the Securities Exchange Commission (the “SEC”).
(c)Concurrently with the execution of this Agreement, the Board shall increase the size of the Board by one and appoint the New Director to the Board to fill the resulting vacancy.  Concurrently with the execution of this Agreement, the Board shall also appoint the New Director to the Nominating Committee. 
(d)Concurrently with the execution of this Agreement, the White Hat Parties shall send a letter to the Corporate Secretary and Treasurer of the Company irrevocably withdrawing (i) the nomination letter they previously sent to the Company on May 26, 2020, and, accordingly, (ii) their nomination (the “Nominations”) of three directors for election to the Board at the Company’s 2020 Annual Meeting of Stockholders (including any adjournments or postponements thereof, the “2020 Annual Meeting”).
(e)The Nominating Committee and the Board shall take all necessary action to nominate Brett Shockley for election to the Board at the 2020 Annual Meeting, and to recommend his election and to support and solicit proxies in the same manner as the other candidates nominated by the Board in the Company’s proxy statements for the 2020 Annual Meeting.
(f)Nothing in this Agreement shall be deemed to abridge or limit the fiduciary duties of any member of the Board under Delaware law.
2.Representations of the White Hat Parties. The White Hat Parties represent and warrant to the Company as of the date hereof as follows:
(a)The White Hat Parties are the beneficial owners of 319,708 shares of Common Stock, such shares of Common Stock constitute all of the Common Stock beneficially owned by the White Hat Parties and the White Hat Parties have no agreements, understandings or undertakings with any third party to share or delegate disposition or voting control over such shares of Common Stock, or to transfer, hypothecate or lend such shares Common Stock.
(b)Each of the White Hat Parties has the power and authority to execute and deliver this Agreement. This Agreement (i) has been duly and validly authorized by each of the White Hat Parties, and constitutes a legal, valid and binding obligation of each of the White Hat Parties, enforceable against each of the White Hat Parties in accordance with its terms except as may be limited by bankruptcy, insolvency or similar laws affecting creditors’ rights and general equitable principles, (ii) does not require the approval of any investor in or member of the White Hat Parties and (iii) does not violate any law, order of any court or any governmental agency or regulation or the charter or any organizational document 

	
			
	 
	 
	Exhibit 10.1

of the White Hat Parties, or conflict with, result in a breach of or constitute a default under any agreement or instrument by which the White Hat Parties or any of their respective assets is bound.
3.Representations of the Company. The Company represents and warrants to the White Hat Parties as of the date hereof that it has the corporate power and authority to execute and deliver this Agreement. This Agreement (i) has been duly and validly authorized by the Company and constitutes a legal, valid and binding obligations of the Company, enforceable against the Company in accordance with its terms except as may be limited by bankruptcy, insolvency or similar laws affecting creditors’ rights and general equitable principles and (ii) does not violate any law, order of any court or any agency or regulation or the Company’s Certificate of Incorporation or the Bylaws, or conflict with, result in a breach of or constitute a default under any agreement or instrument by which the Company or any of its assets or the assets of its subsidiaries are bound. 
4.Voting Commitments.  The White Hat Parties shall appear in person or by proxy for quorum purposes at the 2020 Annual Meeting, including any adjournment or postponement thereof, to vote all of the shares of Common Stock beneficially owned by the White Hat Parties on the record date (if the 2020 Annual Meeting is within thirty (30) days of the anniversary of the Company’s 2019 Annual Meeting of Stockholders, such number of shares shall be no less than 90% of the Current Position) for such meeting (i) in favor of all persons nominated by the Board to serve as directors of the Company and against any stockholder nominated candidate not endorsed by the Board, (ii) against the stockholder proposal made pursuant to Rule 14a-8 under the Exchange Act as disclosed to the White Hat Parties prior to the execution of this Agreement, (iii) to ratify the appointment of the Company’s independent registered public accounting firm, and (iv) in accordance with the Board’s recommendation with respect to the Company’s “say-on-pay” proposal and new equity compensation plan (collectively, the “2020 Proposals”), provided, that with respect to the proposals described in clauses (ii) through (iv) of this Section 4, the White Hat Parties may vote in accordance with the recommendation of Institutional Shareholders Services to the extent such recommendation differs from the voting commitments set forth herein and provided that the White Hat Parties do not publicly disclose their vote on such proposals if it differs from the Board’s recommendation; and provided, further, that White Hat Parties shall have the right to vote the shares of Common Stock beneficially owned by the White Hat Parties in their sole discretion with respect to all other proposals brought before the 2020 Annual Meeting.  The White Hat Parties shall provide written evidence of the votes made in accordance with the foregoing sentence to the Company no later than ten business days before the 2020 Annual Meeting.
5.Support Period Covenants. Except as otherwise contemplated in this Agreement, at all times during the period commencing on the date hereof and ending on the date that is thirty (30) days prior to expiration of the advance notice period for the submission by stockholders of director nominations for consideration at the 2021 Annual Meeting as set forth in the Bylaws, the White Hat Parties shall not, and shall cause the White Hat Representatives not to, directly or indirectly, in any manner, alone or in concert with others: (a) attempt to call a special meeting of stockholders of the Company; or (b) make a request for any stockholder list or other Company books and records, whether pursuant to Section 220 of the Delaware General Corporation Law or otherwise.
6.Press Release. The Parties agree that the Company shall issue a press release and file a Current Report on Form 8-K in substantially the forms agreed to between the Parties promptly following the execution and delivery of this Agreement by the Parties and shall not make any other public disclosure relating to this Agreement or the transactions contemplated herein without the prior review and good faith consideration of any comments made by the White Hat Parties. The White Hat Parties agree that they shall not issue a press release regarding the subject matter of this Agreement for a period of three (3) months after the date of this Agreement.
7.Miscellaneous.
(a)Specific Enforcement; Special Remedy.  Each of the Parties agrees that the other Party would be irreparably injured in the event that any provision of the Agreement is breached or not performed. Accordingly, it is agreed that each Party shall be entitled to temporary and permanent injunctive relief with respect to each and any breach or purported repudiation of this Agreement by the other and to specifically enforce strict adherence to this Agreement and the terms and provisions hereof against the other in any action instituted in a court of competent jurisdiction, in addition to any other remedy which such aggrieved Party may be entitled to obtain. Moreover, in the event of the breach of any of the provisions of this Agreement, timeliness in obtaining relief is of the essence.
(b)Amendments; Waiver. Neither this Agreement nor any term hereof may be changed, waived, discharged or terminated orally or in writing without a writing signed by the Parties. No delay on the part of either Party in exercising any right, power or privilege hereunder shall operate as a waiver thereof, nor shall any waiver on the part of either Party of any right, power or privilege hereunder operate as a waiver of any other right, power or privilege hereunder, nor shall any single or partial exercise of any right, power or privilege hereunder, preclude any other or further exercise thereof or the exercise of any other right, power or privilege hereunder.
(c)Successors and Assigns. This Agreement shall inure to the benefit of and be binding upon the successors and assigns of each of the parties. This Agreement may not be assigned without the prior written consent of the other Party hereto.
(d)No Third Party Beneficiaries. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person or entity, other than the Parties and their respective successors and assigns, any legal or equitable right, remedy or claim under or in respect of this Agreement and any conditions and provisions hereof being intended to be and being for the 

	
			
	 
	 
	Exhibit 10.1

sole and exclusive benefit of the parties hereto and their respective successors and assigns, and for the benefit of no other person or entity.
(e)Counterparts. This Agreement may be executed in any number of counterparts and by the Parties in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement.
(f)Headings.  The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the meaning hereof.
(g)Governing Law; Choice of Venue.
(i)This Agreement shall be governed by and construed in accordance with the internal laws of the State of Delaware applicable to agreements made and to be performed within that state.
(ii)Each Party (A) consents to submit itself to the personal jurisdiction of the Court of Chancery or other federal or state courts of the State of Delaware in the event any dispute arises out of this Agreement or the transactions contemplated by this Agreement, (B) agrees that it shall not attempt to deny or defeat such personal jurisdiction by motion or other request for leave from any such court, (C) agrees that it shall not bring any action relating to this Agreement or the transactions contemplated by this Agreement in any court other than the Court of Chancery or other federal or state courts of the State of Delaware, and each Party irrevocably waives the right to trial by jury and (D) each Party irrevocably consents to service of process by a reputable overnight mail delivery service, signature requested, to the address of such Party’s principal place of business or as otherwise provided by applicable law.
(h)Reimbursement.  The Company shall reimburse the White Hat Parties for their out-of-pocket expenses, including the fees and expenses of counsel, incurred in connection with their engagement with the Company, the Nominations and the negotiation of, and all matters arising under this Agreement; provided, however, that such reimbursement shall not exceed $55,000.
(i)Severability.  If at any time subsequent to the date hereof, any provision of this Agreement shall be held by any court of competent jurisdiction to be illegal, void or unenforceable, such provision shall be of no force and effect, but the illegality or unenforceability of such provision shall have no effect upon the legality or enforceability of any other provision in this Agreement.
(j)Interpretation and Construction.  Each of the Parties acknowledges that it has been represented by counsel of its choice throughout all negotiations that have preceded the execution of this Agreement, and that it has executed the same with the advice of said independent counsel. Each Party and its counsel cooperated and participated in the drafting and preparation of this Agreement and the documents referred to herein, and any and all drafts relating thereto exchanged among the parties shall be deemed the work product of all of the parties and may not be construed against any Party by reason of its drafting or preparation. Accordingly, any rule of law or any legal decision that would require interpretation of any ambiguities in this Agreement against any Party that drafted or prepared it is of no application and is hereby expressly waived by each Party, and any controversy over interpretations of this Agreement shall be decided without regards to events of drafting or preparation.
(k)Entire Agreement.  This Agreement contains the entire understanding of the Parties with respect to the subject matter hereof.
(l)Notices.  Any notices, consents, determinations, waivers or other communications required or permitted to be given under the terms of this Agreement must be in writing and will be deemed to have been delivered: (i) upon receipt, when delivered personally; (ii) upon receipt, when sent by e-mail to the e-mail address for a Party set forth below; and (iii) one (1) business day after deposit with a nationally recognized overnight delivery service, in each case properly addressed to the Party to receive the same. The addresses for such communications shall be:

	
			
	 
	 
	Exhibit 10.1

If to the Company or the Board:
Spôk Holdings, Inc.
6850 Versar Center, Suite 420
Springfield, Virginia 22151-4148
Attention:     Vince Kelly
Email:     vince.kelly@spok.com
with a copy (which shall not constitute notice) to:
Latham & Watkins LLP
555 Eleventh Street, NW
Suite 1000
Washington, D.C. 20004
Attention:    William O’Neill and Christopher Drewry
E-mail:        William.O'Neill@retiredpartner.lw.com and Christopher.Drewry@lw.com

If to the White Hat Parties:
White Hat Capital Partners LP
150 East 52nd Street
21st Floor
New York, NY 10022
		
	Attention: 
	David Chanley and Mark Quinlan

		
	Email:
	DChanley@whitehatcp.com and MQuinlan@whitehatcp.com

with a copy (which shall not constitute notice) to:
Olshan Frome Wolosky LLP
1325 Avenue of the Americas
New York, NY 10019
		
	Attention:
	Elizabeth Gonzalez-Sussman

		
	E-mail:
	egonzalez@olshanlaw.com

(m)Termination.  Unless earlier terminated as provided in this Agreement, upon the expiration of the Support Period in accordance with Section 4, this Agreement shall immediately and automatically terminate in its entirety and no Party shall have any further rights or obligations under this Agreement; provided, however, no Party shall be released from any breach of this Agreement that occurred prior to the termination of this Agreement.

	
			
	 
	 
	Exhibit 10.1

IN WITNESS WHEREOF, each of the parties hereto has executed this Agreement, or caused the same to be executed by its duly authorized representative as of the date first above written.
	
		
	 
	Spōk Holdings, Inc.

	By:
	/s/ Vincent D. Kelly 

	Name:
	Vincent D. Kelly 

	Title:
	President and Chief Executive Officer

 
 

	
			
	 
	 
	Exhibit 10.1

	
		
	 
	White Hat Strategic Partners LP

By: White Hat SP GP LLC, its General Partner

	 
	 

	By:
	/s/ Mark Quinlan

	Name:
	Mark Quinlan

	Title:
	Managing Member

	 
	 

	 
	White Hat SP GP LLC

	 

	By:
	/s/ Mark Quinlan

	Name:
	Mark Quinlan

	Title:
	Managing Member

	 
	 

	 
	White Hat Capital Partners LP

	 
	 

	By:
	/s/ Mark Quinlan

	Name:
	Mark Quinlan

	Title:
	Managing Partner

	 
	 

	 
	White Hat Capital Partners LP

	 
	 

	By:
	/s/ Mark Quinlan

	Name:
	Mark Quinlan

	Title:
	Managing MemberExhibit 10.1

 

Execution Version

STOCKHOLDER SUPPORT AGREEMENT

 

STOCKHOLDER SUPPORT
AGREEMENT, dated as of June 18, 2020 (this “Agreement”), by and among Tortoise Acquisition Corp., a Delaware
corporation (“TortoiseCorp”), and certain of the stockholders of Hyliion Inc., a Delaware corporation (the “Company”),
whose names appear on the signature pages of this Agreement (each, a “Stockholder” and, collectively, the “Stockholders”),
in each case, solely in such Stockholder’s capacity as a Stockholder (and not in any other capacity).

 

WHEREAS, TortoiseCorp,
SHLL Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of TortoiseCorp (“Merger Sub”), and
the Company propose to enter into, simultaneously herewith, a business combination agreement and plan of reorganization in the
form attached hereto as Exhibit B (the “BCA”; terms used but not defined in this Agreement shall
have the meanings ascribed to them in the BCA), which provides, among other things, that, upon the terms and subject to the conditions
thereof, Merger Sub will be merged with and into the Company (the “Merger”), with the Company surviving the
Merger as a wholly owned subsidiary of TortoiseCorp; and

 

WHEREAS, as of the
date hereof, each Stockholder owns of record the number of shares of Company Common Stock and Company Preferred Stock as set forth
opposite such Stockholder’s name on Exhibit A hereto (all such shares of Company Common Stock and Company Preferred
Stock and any shares of Company Common Stock and Company Preferred Stock of which ownership of record or the power to vote is hereafter
acquired by the Stockholders prior to the termination of this Agreement being referred to herein as the “Shares”).

 

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

 

1. Agreement to
Vote. Each Stockholder, by this Agreement, with respect to its Shares, severally and not jointly,
(unless this Agreement shall have been terminated in accordance with Section 5) hereby agrees to vote, at any meeting of the stockholders
of the Company, and in any action by written consent of the stockholders of the Company (which written consent shall be delivered
promptly, and in any event within twenty four (24) hours, after the Company requests such delivery), all of such Stockholder’s
Shares held by such Stockholder at such time (a) in favor of the approval and adoption of the BCA and approval of the Merger
and all other transactions contemplated by the BCA (including but not limited to approval of the conversion of all Company Preferred
Stock into Company Common Stock subject to and effective immediately prior to the Closing under the BCA) and (b) against
any action, agreement or transaction or proposal that would result in a breach of any covenant, representation or warranty or
any other obligation or agreement of the Company under the BCA or that would reasonably be expected to result in the failure of
the Merger from being consummated. Each Stockholder acknowledges receipt and review of a copy of the BCA.

 

     

     

    

 

2. Transfer of
Shares. Unless this Agreement shall have been terminated in accordance with Section 5, each
Stockholder, severally and not jointly, agrees that it shall not (a) sell, assign, transfer (including by operation of law),
pledge, dispose of, permit to exist any material lien with respect to, or otherwise encumber any of the Shares or otherwise agree
to do any of the foregoing, except for a sale, assignment or transfer pursuant to the BCA or to another stockholder of the Company
that is a party to this Agreement and bound by the terms and obligations hereof, (b) deposit any Shares into a voting trust
or enter into a voting agreement or arrangement or grant any proxy or power of attorney with respect thereto that is inconsistent
with this Agreement or (c) enter into any contract, option or other arrangement or undertaking with respect to the direct
or indirect acquisition or sale, assignment, transfer (including by operation of law) or other disposition of any Shares; provided,
that the foregoing shall not prohibit the transfer of the Shares to (i) if Stockholder is an individual (A) to any member of such
Stockholder’s immediate family, or to a trust for the benefit of Stockholder or any member of Stockholder’s immediate
family, the sole trustees of which are such Stockholder or any member of such Stockholder’s immediate family or (B) by will,
other testamentary document or under the laws of intestacy upon the death of Stockholder; or (ii) if Stockholder is an entity,
a partner, member, or affiliate of Stockholder, but only if, in the case of clause (i) and (ii), such transferee shall execute
this Agreement or a joinder agreeing to become a party to this Agreement.

 

3. Exclusivity.
Unless this Agreement shall have been terminated in accordance with Section 5, each Stockholder, severally and not jointly, agrees
not to, and shall cause its Representatives not to, directly or indirectly, solicit, initiate or continue any discussions or negotiations
with, or encourage or respond to any inquiries or proposals by, or participate in any negotiations with, or provide any information
to, or otherwise cooperate in any way with any person or other entity or “group” within the meaning of Section 13(d)
of the Exchange Act, concerning an Alternative Transaction. Each Stockholder shall, and shall direct its Representatives to, immediately
cease any and all existing discussions or negotiations with any person conducted heretofore with respect to any Alternative Transaction
(other than the transactions contemplated by the BCA) to the extent required by the BCA. If any Stockholder receives any inquiry
or proposal with respect to an Alternative Transaction at any time prior to the termination of this Agreement in accordance with
Section 5, then such Stockholder shall promptly (and in no event later than twenty-four (24) hours after such Stockholder become
aware of such inquiry or proposal) notify such person in writing that the Company is subject to an exclusivity agreement with respect
to the sale of the Company that prohibits them from considering such inquiry or proposal.

 

4. Representations
and Warranties. Each Stockholder, severally and
not jointly, represents and warrants to TortoiseCorp as follows:

 

(a) The execution, delivery
and performance by such Stockholder of this Agreement and the consummation by such Stockholder of the transactions contemplated
hereby do not and will not (i) conflict with or violate any United States or non-United States statute, law, ordinance, regulation,
rule, code, executive order, injunction, judgment, decree or other order applicable to such Stockholder, (ii) require any
consent, approval or authorization of, declaration, filing or registration with, or notice to, any person or entity, (iii) result
in the creation of any encumbrance on any Shares (other than under this Agreement, the BCA and the agreements contemplated by the
BCA) or (iv) conflict with or result in a breach of or constitute a default under any provision of such Stockholder’s
governing documents or any agreement (including any voting agreement) to which such Stockholder is a party.

 

    2

     

    

 

(b) As of the date of
this Agreement, such Stockholder owns exclusively of record and has good and valid title to the Shares set forth opposite the Stockholder’s
name on Exhibit A free and clear of any security interest, lien, claim, pledge, proxy, option, right of first refusal,
agreement, voting restriction, limitation on disposition, charge, adverse claim of ownership or use or other encumbrance of any
kind, other than pursuant to (i) this Agreement, (ii) applicable securities laws, and (iii) the Company’s
Certificate of Incorporation and bylaws, or that certain Amended and Restated Right of First Refusal and Co-Sale Agreement, dated
as of August 29, 2017, by and among the Company and the persons named therein, and as of the date of this Agreement, such Stockholder
has the sole power (as currently in effect) to vote in accordance with this Agreement and right, power and authority to sell, transfer
and deliver such Shares, and such Stockholder does not own, directly or indirectly, any other Shares.

 

(c) Such Stockholder
has the power, authority and capacity to execute, deliver and perform this Agreement and this Agreement has been duly authorized,
executed and delivered by such Stockholder.

 

5. Termination.
This Agreement and the obligations of the Stockholders under this Agreement shall automatically terminate upon the earliest of
(a) the Effective Time; (b) the termination of the BCA in accordance with its terms and (c) the effective date
of a written agreement of the parties hereto terminating this Agreement. Upon termination of this Agreement, neither party shall
have any further obligations or liabilities under this Agreement; provided that nothing in this Section 5 shall relieve any party
of liability for any willful material breach of this Agreement occurring prior to termination. The representations and warranties
contained in this Agreement and in any certificate or other writing delivered pursuant hereto shall not survive the Closing or
the termination of this Agreement.

 

6. Miscellaneous.

 

(a) Except as otherwise
provided herein, all costs and expenses incurred in connection with this Agreement and the transactions contemplated hereby shall
be paid by the party incurring such costs and expenses, whether or not the transactions contemplated hereby are consummated.

 

(b) 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 e-mail or by registered or certified mail (postage prepaid, return receipt requested)
to the respective parties at the following addresses or e-mail addresses (or at such other address or email address for a party
as shall be specified in a notice given in accordance with this Section 6(b)):

 

If to TortoiseCorp, to
it at:

 

Tortoise Acquisition Corp.

452 Fifth Avenue

14th Floor

New York, NY 10018

Attention: Vincent T. Cubbage;
Steven C. Schnitzer

Email: vcubbage@tortoiseadvisors.com;
sschnitzer@tortoiseadvisors.com

 

    3

     

    

 

with a copy to:

 

Vinson & Elkins L.L.P.

1114 Avenue of the Americas

32nd Floor

New York, NY 10036

Attention: Brenda Lenahan; Ramey
Layne; John Kupiec

Email: blenahan@velaw.com; rlayne@velaw.com;
jkupiec@velaw.com

 

If to a Stockholder,
to the address or email address set forth for Stockholder on the signature page hereof.

 

(c) If any term or other
provision of this Agreement is invalid, illegal or incapable of being enforced by any rule of law, or public policy, 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 the transactions contemplated hereby 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 hereto 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 in order that the transactions contemplated hereby be consummated as originally contemplated to the fullest extent possible.

 

(d) This Agreement and
any other Ancillary Agreement to which the Stockholder is a party constitute the entire agreement among the parties with respect
to the subject matter hereof and supersedes all prior agreements and undertakings, both written and oral, among the parties, or
any of them, with respect to the subject matter hereof. This Agreement shall not be assigned (whether pursuant to a merger, by
operation of law or otherwise), by any party without the prior express written consent of the other parties hereto.

 

(e) Except as set forth
below, this Agreement shall be binding upon and inure solely to the benefit of each party hereto (and TortoiseCorp’s permitted
assigns), 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. No Stockholder shall be liable for the breach by any other
Stockholder of this Agreement.

 

(f) The parties hereto
agree that irreparable damage would occur in the event any provision of this Agreement was not performed in accordance with the
terms hereof and that the parties shall be entitled to specific performance of the terms hereof, in addition to any other remedy
at law or in equity.

 

(g) This Agreement shall
be governed by, and construed in accordance with, the laws of the State of Delaware applicable to contracts executed in and to
be performed in that State. All Actions arising out of or relating to this Agreement shall be heard and determined exclusively
in any Delaware Chancery Court. The parties hereto hereby (i) submit to the exclusive jurisdiction of the Delaware Chancery
Court for the purpose of any Action arising out of or relating to this Agreement brought by any party hereto, and (ii) irrevocably
waive, and agree not to assert by way of motion, defense, or otherwise, in any such Action, any claim that it is not subject personally
to the jurisdiction of the above-named courts, that its property is exempt or immune from attachment or execution, that the Action
is brought in an inconvenient forum, that the venue of the Action is improper, or that this Agreement or the transactions contemplated
hereunder may not be enforced in or by any of the above-named courts.

 

    4

     

    

 

(h) This Agreement may
be executed and delivered (including by facsimile or portable document format (pdf) transmission) in counterparts, and by the different
parties hereto 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.

 

(i) At the request of
TortoiseCorp, in the case of any Stockholder, or at the request of the Stockholders, in the case of TortoiseCorp, and without further
consideration, each party shall execute and deliver or cause to be executed and delivered such additional documents and instruments
and take such further action as may be reasonably necessary to consummate the transactions contemplated by this Agreement.

 

(j) This Agreement shall
not be effective or binding upon any Stockholder until after such time as the BCA is executed and delivered by the Company, TortoiseCorp
and Merger Sub.

 

(k) Each of the parties
hereto hereby waives to the fullest extent permitted by applicable law any right it may have to a trial by jury with respect to
any litigation directly or indirectly arising out of, under or in connection with this Agreement. Each of the parties hereto (i) certifies
that no representative, agent or attorney of any other party has represented, expressly or otherwise, that such other party would
not, in the event of litigation, seek to enforce that foregoing waiver and (ii) acknowledges that it and the other parties
hereto have been induced to enter into this Agreement and the transactions contemplated hereby, as applicable, by, among other
things, the mutual waivers and certifications in this Section 6(k).

 

(l) Stockholder signs
this Agreement solely in Stockholder’s capacity as a holder of Shares of the Company, and not in Stockholder’s capacity
as a director, officer or employee of Company or in Stockholder’s capacity as a trustee or fiduciary of any employee benefit
plan or trust. Notwithstanding anything herein to the contrary, nothing herein shall in any way restrict a director or officer
of the Company in the exercise of his or her fiduciary duties as a director or officer of the Company or in his or her capacity
as a trustee or fiduciary of any employee benefit plan or trust or prevent or be construed to create any obligation on the part
of any director or officer of the Company or any trustee or fiduciary of any employee benefit plan or trust from taking any action
in his or her capacity as such director, officer, trustee or fiduciary.

 

    5

     

    

 

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

 

	 	TORTOISE ACQUISITION CORP.
	 	 	 
	 	By:	/s/ Vincent T. Cubbage
	 	Name:	Vincent T. Cubbage
	 	Title:	Chief Executive Officer and President

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	THOMAS HEALY
	 	 
	 	/s/ Thomas Healy
	 	Thomas Healy
	 	 	 
	 	Address: 	3201 Esperanza Crossing APT 510
	 	 	Austin, TX 78758
	 	 	 
	 	Email:	thomas@hyliion.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	EDWARD OLKKOLA
	 	 
	 	/s/ Edward Olkkola
	 	Edward Olkkola
	 	 	 
	 	Address: 	608 Innwood DR
	 	 	Georgetown, TX 78628
	 	 	 
	 	Email:	ed@teakwoodcapital.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	JEANNE OLKKOLA
	 	 
	 	/s/ Jeanne Olkolla
	 	Jeanne Olkkola
	 	 	 
	 	Address: 	608 Innwood Dr.
	 	 	Georgetown, TX 78628
	 	 	 
	 	Email:	jeannerene.61@gmail.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	DAVID DOUGLAS
	 	 
	 	/s/ David Douglas
	 	David Douglas
	 	 	 
	 	Address: 	1623 Harvard Street
	 	 	Houston, TX 77008
	 	 	 
	 	Email:	david@falconpartnersltd.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	AXIOMA VENTURES, LLC
	 	 
	 	By:	Axioma Holdings, LLC
	 	Its:	Sole Member
	 	By:	Axioma Management, LLC
	 	Its:	Manager
	 	 	 
	 	By:	/s/ Howard Jenkins
	 	Name:	Howard Jenkins
	 	Title:	Manager
	 	 	 
	 	Address: 	601 S. Boulevard
	 	 	Tampa, FL 33606
	 	 	 
	 	Email:	hmjhmj@me.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	COLLE CAPITAL PARTNERS I, LP
	 	 
	 	By:	/s/ Victoria Grace
	 	Name:	Victoria Grace
	 	Title:	Authorized Person
	 	 	 
	 	Address: 	55 Hudson Yards
	 	 	NY NY 10001
	 	 	 
	 	Email:	victoria@collecapital.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	COLLE HLN ASSOCIATES LLC
	 	 
	 	By:	/s/ Victoria Grace
	 	Name:	Victoria Grace
	 	Title:	Authorized Person
	 	 	 
	 	Address: 	55 Hudson Yards
	 	 	NY NY 10001
	 	 	 
	 	Email:	victoria@collecapital.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	CONCORD PARTNERS LLC
	 	 
	 	By:	/s/ David Douglas
	 	Name:	David Douglas
	 	Title:	Vice President and Corporate Secretary
	 	 	 
	 	Address: 	1623 Harvard Street
	 	 	Houston, TX 77008
	 	 	 
	 	Email:	david@falconpartnersltd.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	CRA FUND II LLC
	 	 
	 	By:	Berkshire Partners LLC
	 	Its:	Manager
	 	 	 
	 	By:	/s/ Daniel P. Carbonneau
	 	Name:	Daniel P. Carbonneau
	 	Title:	A Duly Authorized Signatory
	 	 	 
	 	Address: 	c/o Berkshire Partners LLC
	 	 	200 Clarendon Street
	 	 	Boston, MA 02116
	 	Email:	crafund2berkshirepartners.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	DOUGCAP, LLC
	 	 
	 	By:	/s/ Steven Douglas
	 	Name:	Steven Douglas
	 	Title:	Managing Member
	 	 	 
	 	Address: 	3015 Virginia St,
	 	 	Houston, TX 77098
	 	 	 
	 	Email:	steven@dougcapmgmt.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	ROTUNDA ENTERPRISES, LLC
	 	 
	 	By:	/s/ Steven Douglas
	 	Name:	Steven Douglas
	 	Title:	Managing Member
	 	 	 
	 	Address: 	3015 Virginia St,
	 	 	Houston, TX 77098
	 	 	 
	 	Email:	steven@dougcapmgmt.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	FJ MANAGEMENT INC.
	 	 
	 	By:	/s/ Richard Bozzelli
	 	Name:	Richard Bozzelli
	 	Title:	Chief Financial Officer
	 	 	 
	 	Address: 	185 S. State Street, Ste. 1300
	 	 	Salt Lake City, UT 84111
	 	 	 
	 	Email:	rick.bozzelli@fjmgt.com

 

Signature page to Stockholder Support
Agreement

 

     

     

    

 

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

 

	 	NEW ERA CAPITAL PARTNERS, L.P.
	 	 
	 	By:	/s/ Gideon Argov
	 	Name:	Gideon Argov
	 	Title:	General Partner
	 	 	 
	 	Address: 	99 Lincoln Street
	 	 	Newton Highlands, MA 02461
	 	 	 
	 	Email:	gideon@neweracp.com

 

Signature page to Stockholder Support
Agreement

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