Document:

EX-10.2

 Exhibit 10.2 

REGISTRATION RIGHTS AND LOCK-UP AGREEMENT 

This Registration Rights and Lock-Up Agreement (this “Agreement”) is made and entered
into as of March 17, 2022 by and among Brookline Capital Acquisition Corp., a Delaware corporation (the “Company”), and the parties listed on Schedule A hereto (each, a “Holder” and collectively, the
“Holders”). Any capitalized term used but not defined herein will have the meaning ascribed to such term in the Business Combination Agreement (as defined below). 

RECITALS 
 WHEREAS, the
Company, Project Barolo Merger Sub, Inc., a Delaware corporation (“Merger Sub”), and Apexigen, Inc., a Delaware corporation (“Apexigen”) are party to that certain Business Combination Agreement, dated as of March
17, 2022 (the “Business Combination Agreement”), pursuant to which, on the Closing Date (as defined in the Business Combination Agreement), Merger Sub will merge with and into Apexigen (the “Merger”), with Apexigen
surviving the Merger as a wholly owned subsidiary of the Company; 
 WHEREAS, pursuant to the Business Combination Agreement, the Company is
issuing shares of the Company’s common stock, par value $0.0001 per share (the “Common Stock”), to the Holders designated on Schedule A hereto; and 

WHEREAS, the Company desires to set forth certain matters regarding the ownership of the Registrable Securities (as defined below) by the
Holders. 
 NOW, THEREFORE, in consideration of the mutual covenants and agreements set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
 ARTICLE I 

DEFINITIONS 

Section 1.1 Definitions. For purposes of this Agreement, the terms (and any variations thereof) used in this
Agreement shall be either as defined in the Preamble or Recitals, or shall have the meanings set forth below: 
 “Adverse
Disclosure” means any public disclosure of material non-public information, which disclosure, in the good faith judgment of the Chief Executive Officer, Chief Financial Officer or Chief Operating
Officer of the Company, after consultation with outside counsel to the Company, (i) would be required to be made in any Registration Statement or Prospectus in order for the applicable Registration Statement or Prospectus not to contain any
untrue statement of a material fact or omit to state a material fact necessary to make the statements contained therein (in the case of any prospectus and any preliminary prospectus, in the light of the circumstances under which they were made) not
misleading, (ii) would not be required to be made at such time if the Registration Statement were not being filed, and (iii) the Company has a bona fide business purpose for not making such information public. 

“Board” shall mean the Board of Directors of the Company. 

 “Business Day” means a day other than Saturday, Sunday or other day on
which commercial banks in New York, New York are authorized or required by law to close. 
 “Change in Control” means,
following the closing of the Merger, the transfer (whether by tender offer, merger, stock purchase, consolidation or other similar transaction), in one transaction or a series of related transactions, to a person or group of affiliated persons of
the Company’s voting securities if, after such transfer, such transferee or group of affiliated transferees would hold more than 50% of outstanding voting securities of the Company (or surviving entity) or would otherwise have the power to
control the Board or to direct the operations of the Company. 
 “Commission” means the Securities and Exchange Commission,
or any other federal agency then administering the Securities Act or the Exchange Act. 
 “Demand Registration” has the
meaning set forth in Section 2.1.1. 
 “Demanding Holder” has the meaning set forth in
Section 2.1.1. 
 “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the
rules and regulations of the Commission promulgated thereunder, all as the same shall be in effect at the time. 

“Form S-1” has the meaning set forth in
Section 2.1.1. 
 “Form S-1 Shelf” has
the meaning set forth in Section 2.3.1. 

“Form S-3 Shelf” has the meaning set forth in
Section 2.3.1. 
 “Exchange Act” shall mean the Securities Exchange Act of 1934, as it may be
amended from time to time. 
 “Lock-up Period” means, with respect to the
Registrable Securities held by the Significant Holders, (A) for half of such Registrable Securities, the period ending on the earlier of (i) the date that is six months after the date of the closing of the Merger pursuant to the Business
Combination Agreement or (ii) the date on which, subsequent to the closing of the Merger, the last sale price of the Common Stock (x) equals or exceeds $12.50 per share (as adjusted for stock splits, stock dividends, reorganizations,
recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing after the closing of the Merger, and (B) for the remaining half of such Registrable Securities, such
Registrable Securities may not be transferred, assigned or sold until six months after the date of the closing of the Merger pursuant to the Business Combination Agreement; or earlier, in either case, if, subsequent to the of the closing of the
Merger pursuant to the Business Combination Agreement, the date on which the Company completes a liquidation, merger, stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange
their shares of Common Stock for cash, securities or other property; provided that in the sole discretion of the majority of the independent members of the Board, the Lock-Up Period may end earlier than
as provided herein upon written notice to the Significant Holders. 
 “Maximum Number of Securities” has the meaning set
forth in Section 2.1.4. 

  
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 “Minimum Takedown Threshold” has the meaning set forth in
Section 2.3.1. 
 “Misstatement” means an untrue statement of a material fact or an omission to
state a material fact required to be stated in a Registration Statement or Prospectus, or necessary to make the statements in a Registration Statement or Prospectus in the light of the circumstances under which they were made not misleading. 

“Notices” has the meaning set forth in Section 6.2. 

“Piggyback Registration” has the meaning set forth in Section 2.2.1. 

“Pro Rata” has the meaning set forth in Section 2.1.4. 

“Prospectus” shall mean the prospectus included in any Registration Statement, as supplemented by any and all prospectus
supplements and as amended by any and all post-effective amendments and including all material incorporated by reference in such prospectus. 

“Registrable Securities” means any equity securities (including the shares of Common Stock issued or issuable upon the
exercise or conversion of any such equity security) of the Company outstanding immediately following consummation of the Merger that are held by a Holder. Registrable Securities include any warrants, shares of capital stock or other securities of
the Company issued as a dividend or other distribution with respect to or in exchange for or in replacement of any of the securities described in the prior sentence. As to any particular Registrable Security, such security shall cease to be a
Registrable Security when: (a) a Registration Statement with respect to the sale of such security shall have become effective under the Securities Act and such security shall have been sold, transferred, disposed of or exchanged in accordance
with such Registration Statement; (b) such security shall have been otherwise transferred, a new certificate for such security not bearing a legend restricting further transfer shall have been delivered by the Company and subsequent public
distribution of such security shall not require registration under the Securities Act; (c) such security shall have ceased to be outstanding; or (d) such security is freely saleable under Rule 144 without volume limitations. 

“Registration” means a registration effected by preparing and filing a registration statement or similar document in
compliance with the requirements of the Securities Act, and the applicable rules and regulations promulgated thereunder, and such registration statement becoming effective. 

“Registration Expenses” means the
out-of-pocket expenses of a Registration, including, without limitation, the following: 

(A) all registration and filing fees (including fees with respect to filings required to be made with the Financial Industry Regulatory
Authority and any securities exchange on which the Common Stock is then listed); 
 (B) fees and expenses of compliance with securities or
blue sky laws (including reasonable fees and disbursements of counsel for the Underwriters in connection with blue sky qualifications of Registrable Securities); 

  
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 (C) printing, messenger, telephone and delivery expenses; 

(D) reasonable fees and disbursements of counsel for the Company; 

(E) reasonable fees and disbursements of all independent registered public accountants of the Company incurred specifically in connection
with such Registration; and 
 (F) reasonable fees and expenses of one (1) legal counsel selected by the majority-in-interest of the Demanding Holders initiating a Demand Registration to be registered for offer and sale in the applicable Registration. 

“Registration Statement” means a registration statement filed by the Company with the Commission in compliance with the
Securities Act and the rules and regulations promulgated thereunder for a public offering and sale of securities (other than a registration statement on Form S-4 or Form S-8, or their successors, or any registration statement covering only
securities proposed to be issued in exchange for securities or assets of another entity). 
 “Requesting Holder” has the
meaning set forth in Section 2.1.1. 
 “Rule 144” means Rule 144 promulgated under the Securities
Act. 
 “Rule 415” has the meaning set forth in Section 2.3.1. 

“Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations of the Commission promulgated
thereunder, all as the same shall be in effect at the time. 
 “Shelf” has the meaning set forth in
Section 2.3.1. 
 “Shelf Registration” has the meaning set forth in
Section 2.3.1. 
 “Shelf Underwriting Request” has the meaning set forth in
Section 2.3.1. 
 “Significant Holder” means each of the Holders listed on Schedule B
attached hereto, which schedule may be updated from time to time to include additional Holders who become a party to this Agreement. 

“Transfer” means to, directly or indirectly, sell, transfer, assign, pledge, encumber, hypothecate or similarly dispose of,
either voluntarily or involuntarily, or to enter into any contract, option or other arrangement or understanding with respect to the sale, transfer, assignment, pledge, encumbrance, hypothecation or similar disposition of, any interest owned by a
person or any interest (including a beneficial interest) in, or the ownership, control or possession of, any interest owned by a person. 

“Underwriter” means a securities dealer who purchases any Registrable Securities as principal in an underwritten offering and
not as part of such dealer’s market-making activities. 

  
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 “Underwritten Registration” or “Underwritten Offering”
means a Registration in which securities of the Company are sold to an Underwriter in a firm commitment underwriting for distribution to the public. 

ARTICLE II 
 REGISTRATION

 Section 2.1 Demand Registration 

2.1.1 Request for Registration. Subject to the provisions of Section 2.1.4,
Section 2.3 and Section 2.4 hereof, at any time and from time to time on or after the closing of the Merger, the Holders holding at least a majority in interest of the then-outstanding number of
Registrable Securities held by all the Holders (such Holders, the “Demanding Holders”), may make a written demand for Registration under the Securities Act of all or part of their Registrable Securities, which written demand shall
describe the amount and type of securities to be included in such Registration and the intended method(s) of distribution thereof (such written demand a “Demand Registration”). The Company shall, within ten (10) days of the
Company’s receipt of the Demand Registration, notify, in writing, all other Holders of Registrable Securities of such demand, and each Holder of Registrable Securities who thereafter wishes to include all or a portion of such Holder’s
Registrable Securities in the Demand Registration (each such Holder that includes all or a portion of such Holder’s Registrable Securities in such Registration, a “Requesting Holder”) shall so notify the Company, in writing,
within five (5) days after the receipt by the Holder of the notice from the Company. Upon receipt by the Company of any such written notification from a Requesting Holder(s) to the Company, such Requesting Holder(s) shall be entitled to have
their Registrable Securities included in a Registration pursuant to a Demand Registration and the Company shall effect, as soon thereafter as practicable, but not more than sixty (60) days immediately after the Company’s receipt of the
Demand Registration (or 120 days if the Commission notifies the Company that it will “review” the Registration Statement for such Registration), the Registration of all Registrable Securities requested by the Demanding Holders and
Requesting Holders pursuant to such Demand Registration. Under no circumstances shall the Company be obligated to effect more than an aggregate of two (2) Registrations pursuant to a Demand Registration under this
Section 2.1.1 initiated by Holders. 
 2.1.2 Effective Registration. Notwithstanding the provisions of
Section 2.1.1 above or any other part of this Agreement, a Registration pursuant to a Demand Registration shall not count as a Registration unless and until (i) a Form S-1 or any similar long-form registration
statement that may be available at such time (“Form S-1”) filed with the Commission in connection with the Registration has been declared effective by the Commission and
(ii) the Company has complied with all of its obligations under this Agreement with respect thereto; provided, that if, after such Registration Statement has been declared effective, the offering of Registrable Securities pursuant to a
Demand Registration is interfered with by any stop order or injunction of the Commission or any other governmental agency or court, the Registration Statement with respect to such Demand Registration will be deemed not to have been declared
effective, unless and until, (i) such stop order or injunction is removed, rescinded or otherwise terminated, and (ii) a majority-in-interest of the Demanding
Holders initiating such Demand Registration thereafter affirmatively elect to continue with such Registration and accordingly notify the Company in writing of such election, which notice shall be received by the Company not later than five
(5) days after the removal of any such stop order or injunction; provided, further, that the Company shall not be obligated to file a second Registration Statement until a Registration Statement that has been previously filed
pursuant to a Demand Registration becomes effective or is terminated. 

  
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 2.1.3 Underwritten Offering. Subject to the provisions of
Section 2.1.4 and Section 2.4 hereof, if a majority-in-interest of the Demanding Holders so advise the Company as
part of their Demand Registration that the offering of Registrable Securities pursuant thereto shall be in the form of an Underwritten Offering, then the right of such Demanding Holder or Requesting Holder (if any) to include its Registrable
Securities in such Registration shall be conditioned upon such Holder’s participation in such Underwritten Offering and the inclusion of such Holder’s Registrable Securities in such Underwritten Offering to the extent provided herein. All
such Holders proposing to distribute their Registrable Securities through an Underwritten Offering under this Section 2.1.3 shall enter into an underwriting agreement in customary form with the Underwriter(s) selected for
such Underwritten Offering by the Company, which Underwriter(s) shall be reasonably acceptable to a majority-in-interest of the Demanding Holders initiating the Demand
Registration. 
 2.1.4 Reduction of Underwritten Offering. If the managing Underwriter(s) for a Demand Registration that is to be an
Underwritten Offering, in good faith, advises the Company, the Demanding Holders and the Requesting Holders in writing that the dollar amount or number of Registrable Securities which the Demanding Holders and the Requesting Holders (if any) desire
to sell, taken together with all other shares of Common Stock or other equity securities which the Company desires to sell and the shares of Common Stock, if any, as to which a Registration has been requested pursuant to separate written contractual
piggy-back registration rights held by other stockholders of the Company who desire to sell, exceeds the maximum dollar amount or maximum number of equity securities that can be sold in the Underwritten Offering without adversely affecting the
proposed offering price, the timing, the distribution method, or the probability of success of such Underwritten Offering (such maximum dollar amount or maximum number of securities, as applicable, the “Maximum Number of
Securities”), then the Company shall include in such Underwritten Offering, as follows: (i) first, the Registrable Securities of the Demanding Holders and the Requesting Holders (if any) (pro rata based on the respective number of
Registrable Securities that each Demanding Holder and Requesting Holder (if any) has requested be included in such Underwritten Registration and the aggregate number of Registrable Securities that the Demanding Holders and Requesting Holders have
requested be included in such Underwritten Registration (such proportion is referred to herein as “Pro Rata”)) that can be sold without exceeding the Maximum Number of Securities; (ii) second, to the extent that the Maximum
Number of Securities has not been reached under the foregoing clause (i), the Registrable Securities of Holders (Pro Rata, based on the respective number of Registrable Securities that each such Holder has so requested exercising their rights to
register their Registrable Securities pursuant to Section 2.2.1 hereof) that can be sold without exceeding the Maximum Number of Securities; (iii) third, to the extent that the Maximum Number of Securities has not been
reached under the foregoing clauses (i) and (ii), the Common Stock or other equity securities of other persons or entities that the Company is obligated to register in a Registration pursuant to separate written contractual arrangements that pre-dates this Agreement with such persons and that can be sold without exceeding the Maximum Number of Securities; (iv) fourth, to the extent that the Maximum Number of Securities has not been reached under
the foregoing clauses (i), (ii) and 

  
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(iii), the Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (v) fifth, to the extent that
the Maximum Number of Securities has not been reached under the foregoing clauses (i), (ii), (iii) and (iv), the Common Stock or other equity securities of other persons or entities that the Company is obligated to register in a Registration
pursuant to separate written contractual arrangements with such persons and that can be sold without exceeding the Maximum Number of Securities. 

2.1.5 Demand Registration Withdrawal. A
majority-in-interest of the Demanding Holders initiating a Demand Registration pursuant to a Registration under Section 2.1.1 shall have the
right to withdraw from a Registration pursuant to such Demand Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter(s) (if any) of their intention to withdraw from such Registration prior to the
effectiveness of the Registration Statement filed with the Commission with respect to the Registration of their Registrable Securities pursuant to such Demand Registration. Notwithstanding anything to the contrary in this Agreement, if with respect
to a Demand Registration, a majority-in-interest of the Demanding Holders initiating a Demand Registration so withdraw from a Registration pursuant to such Demand
Registration, such Registration shall not count as a Demand Registration provided for in Section 2.1.1 and the Company shall be responsible for the Registration Expenses incurred in connection with a Registration pursuant
to a Demand Registration prior to its withdrawal under this Section 2.1.5. 

Section 2.2 Piggy-Back Registration. 

2.2.1 Piggy-Back Rights. If, at any time on or after the closing of the Merger, the Company proposes to file a Registration Statement
under the Securities Act with respect to an offering of equity securities, or securities or other obligations exercisable or exchangeable for, or convertible into, equity securities, by the Company for its own account or for the account of
stockholders of the Company (or by the Company and by stockholders of the Company including, without limitation, pursuant to Section 2.1), other than a Registration Statement (i) filed in connection with any employee
stock option or other benefit plan, (ii) for an exchange offer or offering of securities solely to the Company’s existing stockholders, (iii) for an offering of debt that is convertible into equity securities of the Company,
(iv) filed pursuant to Section 2.3, or (v) for a dividend reinvestment plan, then the Company shall (x) give written notice of such proposed filing to all of the Holders of Registrable Securities as soon as
practicable but in no event less than ten (10) days before the anticipated filing date, which notice shall describe the amount and type of securities to be included in such offering, the intended method(s) of distribution, and the name of the
proposed managing Underwriter or Underwriters, if any, of the offering, and (y) offer to all of the Holders of Registrable Securities in such notice the opportunity to register the sale of such number of shares of Registrable Securities as such
holders may request in writing within five (5) days following receipt of such notice (a “Piggyback Registration”). The Company shall, in good faith, cause such Registrable Securities to be included in such Registration and
shall use its reasonable best efforts to cause the managing Underwriter(s) of a proposed Underwritten Offering to permit the Registrable Securities requested to be included in such Piggyback Registration on the same terms and conditions as any
similar securities of the Company and to permit the sale or other disposition of such Registrable Securities in accordance with the intended method(s) of distribution thereof. All Holders of Registrable Securities proposing to distribute their
Registrable Securities through a Piggyback Registration that involves an Underwriter(s) shall enter into an underwriting agreement in customary form with the Underwriter(s) selected for such Piggyback Registration. 

  
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 2.2.2 Reduction of Piggyback Registration. If the managing Underwriter(s) for a
Piggyback Registration that is to be an Underwritten Offering, in good faith, advises the Company and the Holders of Registrable Securities participating in the Piggyback Registration in writing that the dollar amount or number of securities which
the Company desires to sell, taken together with (i) the Common Stock or other equity securities, if any, as to which Registration has been demanded pursuant to separate written contractual arrangements with persons or entities other than the
Holders of Registrable Securities hereunder, (ii) the Registrable Securities as to which Registration has been requested under this Section 2.2, and (iii) the Common Stock or other equity securities, if any, as to
which Registration has been requested pursuant to separate written contractual piggyback registration rights of other stockholders of the Company, exceeds the Maximum Number of Securities, then: 

(i) If the Registration is undertaken for the Company’s account, the Company shall include in any such Registration (A) first, the
Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; (B) second, to the extent that the Maximum Number of Securities has not been reached under the
foregoing clause (A) , the Registrable Securities of Holders exercising their rights to register their Registrable Securities pursuant to Section 2.2.1 hereof, Pro Rata, which can be sold without exceeding the Maximum
Number of Securities; and (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A) and (B), the Common Stock, if any, as to which Registration has been requested pursuant to
written contractual piggyback registration rights of other stockholders of the Company not otherwise covered above, which can be sold without exceeding the Maximum Number of Securities; and 

(ii) If the Registration is pursuant to a request by persons or entities other than the Holders of Registrable Securities, then the Company
shall include in any such Registration (A) first, the Common Stock or other equity securities, if any, of such requesting persons or entities, other than the Holders of Registrable Securities, which can be sold without exceeding the Maximum
Number of Securities; (B) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (A), the Common Stock or other equity securities that the Company desires to sell, which can be sold without
exceeding the Maximum Number of Securities; (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A) and (B), the Registrable Securities of Holders exercising their rights to
register their Registrable Securities pursuant to Section 2.2.1, Pro Rata based on the number of Registrable Securities that each Holder has requested be included in such Underwritten Registration and the aggregate number
of Registrable Securities that the Holders have requested to be included in such Underwritten Registration, which can be sold without exceeding the Maximum Number of Securities; and (D) fourth, to the extent that the Maximum Number of
Securities has not been reached under the foregoing clauses (A), (B) and (C), the Common Stock or other equity securities for the account of other persons or entities that the Company is obligated to register pursuant to separate written
contractual arrangements with such persons or entities, which can be sold without exceeding the Maximum Number of Securities. 

  
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 2.2.3 Piggyback Registration Withdrawal. Any Holder of Registrable Securities shall
have the right to withdraw from a Piggyback Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter(s) of his, her or its intention to withdraw from such Piggyback Registration prior to the
effectiveness of the Registration Statement filed with the Commission with respect to such Piggyback Registration. The Company (whether on its own good faith determination or as the result of a request for withdrawal by persons pursuant to separate
written contractual obligations) may withdraw a Registration Statement filed with the Commission in connection with a Piggyback Registration at any time prior to the effectiveness of such Registration Statement. Notwithstanding anything to the
contrary in this Agreement, the Company shall be responsible for the Registration Expenses incurred in connection with the Piggyback Registration prior to its withdrawal under this Section 2.2.3. 

2.2.4 Unlimited Piggyback Registration Rights. For purposes of clarity, any Registration effected pursuant to
Section 2.2 hereof shall not be counted as a Registration pursuant to a Demand Registration effected under Section 2.1 hereof or an Underwritten Offering pursuant to a Shelf Underwriting Request
effected under Section 2.3 hereof. 
 2.2.5 Right to Terminate Registration. The Company shall have the right to
terminate or withdraw any registration initiated by it under this Section 2.2 prior to the effectiveness of such registration whether or not any Holder of Registrable Securities has elected to include securities in such
registration. 
 Section 2.3 Shelf Registration. 

2.3.1 Initial Registration. The Company shall file a shelf registration statement under Rule 415 of the Securities Act (or any
successor rule promulgated thereafter by the Commission) (“Rule 415”) on Form S-1 (the “Form S-1 Shelf”) within forty five
(45) days of the closing of the Merger covering the resale of all Registrable Securities on a delayed or continuous basis (a “Shelf Registration”), and use commercially reasonable efforts to cause such Registration Statement to
be declared effective as soon as practicable thereafter and no later than the earlier of (x) the 60th calendar day (or 120th calendar day if the Commission notifies the Company that it will “review” the Registration Statement)
following the filing date and (y) the tenth (10th) Business Day after the date the Company is notified (orally or in writing, whichever is earlier) by the Commission that the Registration Statement will not be “reviewed” or will not
be subject to further review. If, at any time the Company shall have qualified for the use of a Registration Statement on Form S-3 (the “Form S-3 Shelf”
and, together with the Form S-1 Shelf, each a “Shelf”) or any other form which permits incorporation of substantial information by reference to other documents filed by the Company with the
Commission and at such time the Company has an outstanding Form S-l Shelf, then the Company shall use its commercially reasonable efforts to, as soon as reasonably practical, convert such outstanding Form S-l Shelf into a Form S-3 Shelf. Such Shelf shall provide for the resale of the Registrable Securities included therein pursuant to any method or combination of methods
legally available to, and requested by, any Holder named therein. The Company shall use its commercially reasonable efforts to maintain the Shelf in accordance with the terms hereof, and shall prepare and file with the Commission such amendments,
including post-effective amendments, and supplements as may be necessary to keep a Shelf continuously effective and available for use to permit all Holders named therein to sell their Registrable Securities included therein and in compliance

  
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with the provisions of the Securities Act until such time as there are no longer any Registrable Securities, subject in each case to the provisions of this Agreement that permit the Company to
suspend the use of the Registration Statement in the circumstances, and subject to the terms and conditions, set forth in those provisions. No filing of a Form S-1 Shelf or a Form S-3 Shelf, as applicable, pursuant to this Section 2.3 shall be counted as a Demand Registration effected pursuant to Section 2.1. Notwithstanding anything to the contrary herein, to the
extent there is an effective Shelf under this Section 2.3, covering a Holder’s or Holders’ Registrable Securities, such Holder or Holders shall not have rights to make a Demand Registration with respect to
Section 2.1. Notwithstanding anything to the contrary herein, to the extent there is an effective Shelf under this Section 2.3, covering a Holder’s or Holders’ Registrable Securities, and such Holder or Holders
qualify for and wish to request an Underwritten Offering from such Shelf (a “Shelf Underwriting Request”), such Underwritten Offering shall follow the procedures and limitations of Section 2.1 (including
Section 2.1.3 and Section 2.1.4) but such Underwritten Offering shall be made from the Shelf and shall count against the number of Demand Registrations that may be made by the applicable Holder(s) pursuant to
Section 2.1.1; provided that, in the event that the Underwritten Offering is being made from a Form S-3 Shelf, (i) the period of time for the Company to notify all other Holders of Registrable
Securities of the Company’s receipt of the applicable Demand Registration shall be reduced from ten (10) days (as set forth in Section 2.1.1) to two (2) Business Days and (ii) the period of time that the Holders have
to respond to such notice shall be reduced from five (5) days (as set forth in Section 2.1.1) to three (3) Business Days. Notwithstanding anything to the contrary in Section 2.1.1 or this Section 2.3.1
the Company shall only be obligated to effect an Underwritten Offering pursuant to such Shelf Underwriting Request if such Underwritten Offering shall include Registrable Securities proposed to be sold by the Demanding Holder, either individually or
together with other Demanding Holders, (x) with a total offering price reasonably expected to exceed, in the aggregate, $10,000,000 or (y) that constitute all of the remaining Registrable Securities held by the Demanding Holder ((x) or
(y), as applicable, the “Minimum Takedown Threshold”). Notwithstanding anything to the contrary in this Agreement, the Company may effect any Underwritten Offering pursuant to any then effective Registration Statement, including a
Form S-3, that is then available for such offering. 
 2.3.2 Removal of Holders. The Company
shall have the right to remove any persons no longer holding Registrable Securities from the Shelf or any other shelf registration statement by means of a post-effective amendment. 

2.3.3 Right to Register Additional Common Stock. The Company shall have the right to register any other Common Stock or securities of
the Company on any Registration Statement, including the Shelf. 
 Section 2.4 Restrictions on
Registration Rights. If (A) during the period starting with the date sixty (60) days prior to the Company’s good faith estimate of the date of the filing of, and ending on a date one hundred and twenty (120) days after the
effective date of, a Company initiated Registration and provided that the Company has delivered written notice to the Holders prior to receipt of a Demand Registration pursuant to Section 2.1.1 and it continues to actively
employ, in good faith, all reasonable efforts to cause the applicable Registration Statement to become effective; (B) the Holders have requested an Underwritten Registration and the Company and the Holders are unable to obtain the commitment of
underwriters to firmly underwrite the offer; or 

  
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(C) in the good faith judgment of the Board such Registration would be seriously detrimental to the Company and the Board concludes as a result that it is essential to defer the filing of
such Registration Statement at such time, then in each case the Company shall furnish to such Holders a certificate signed by the Chairman of the Board or the Chief Executive Officer stating that in the good faith judgment of the Board it would be
seriously detrimental to the Company for such Registration Statement to be filed in the near future and that it is therefore essential to defer the filing of such Registration Statement. In such event, the Company shall have the right to defer such
filing for a period of not more than sixty (60) days; provided, that the Company may not defer its obligation in this manner more than twice or for more than a total of ninety (90) days (in each case counting deferrals initiated
pursuant to (A), (B) and (C) in the aggregate) in any 12-month period. 
 ARTICLE III 

REGISTRATION PROCEDURES 

Section 3.1 General Procedures. If at any time on or after the closing of the Merger the Company is
required to effect the registration of any Registrable Securities pursuant to Article II, the Company shall use its reasonable best efforts to effect the Registration to permit the sale of such Registrable Securities in
accordance with the intended plan of distribution thereof, and pursuant thereto the Company shall, as expeditiously as practicable and in connection with any such request: 

3.1.1 prepare and file with the Commission as soon as practicable a Registration Statement with respect to such Registrable Securities and use
its reasonable best efforts to cause such Registration Statement to become effective and remain effective until all Registrable Securities covered by such Registration Statement have been sold; 

3.1.2 prepare and file with the Commission such amendments and post-effective amendments to the Registration Statement, and such supplements
to the Prospectus, as may be reasonably requested by the Holders or any Underwriter of Registrable Securities or as may be required by the rules, regulations or instructions applicable to the registration form used by the Company or by the
Securities Act or rules and regulations thereunder to keep the Registration Statement effective until all Registrable Securities covered by such Registration Statement are sold in accordance with the intended plan of distribution set forth in such
Registration Statement or supplement to the Prospectus; 
 3.1.3 prior to filing a Registration Statement or Prospectus, or any amendment or
supplement thereto, furnish without charge to the Underwriters, if any, and the Holders of Registrable Securities included in such Registration, and such Holders’ legal counsel, copies of such Registration Statement as proposed to be filed,
each amendment and supplement to such Registration Statement (in each case including all exhibits thereto and documents incorporated by reference therein), the Prospectus included in such Registration Statement (including each preliminary
Prospectus), and such other documents as the Underwriters and the Holders of Registrable Securities included in such Registration or the legal counsel for any such Holders may request in order to facilitate the disposition of the Registrable
Securities owned by such Holders; 

  
 11 

 3.1.4 prior to any public offering of Registrable Securities, use its reasonable best
efforts to (i) register or qualify the Registrable Securities covered by the Registration Statement under such securities or “blue sky” laws of such jurisdictions in the United States as the Holders of Registrable Securities included
in such Registration Statement (in light of their intended plan of distribution) may request and (ii) take such action necessary to cause such Registrable Securities covered by the Registration Statement to be registered with or approved by
such other governmental authorities as may be necessary by virtue of the business and operations of the Company and do any and all other acts and things that may be necessary or advisable to enable the Holders of Registrable Securities included in
such Registration Statement to consummate the disposition of such Registrable Securities in such jurisdictions; provided, that the Company shall not be required to qualify generally to do business in any jurisdiction where it would not
otherwise be required to qualify or take any action to which it would be subject to general service of process or taxation in any such jurisdiction where it is not then otherwise so subject; 

3.1.5 cause all such Registrable Securities to be listed on each securities exchange or automated quotation system on which similar securities
issued by the Company are then listed; 
 3.1.6 provide a transfer agent or warrant agent, as applicable, and registrar for all such
Registrable Securities no later than the effective date of such Registration Statement; 
 3.1.7 advise each seller of such Registrable
Securities, promptly after it shall receive notice or obtain knowledge thereof, of the issuance of any stop order by the Commission suspending the effectiveness of such Registration Statement or the initiation or threatening of any proceeding for
such purpose and promptly use its reasonable best efforts to prevent the issuance of any stop order or to obtain its withdrawal if such stop order should be issued; 

3.1.8 advise each Holder of Registrable Securities covered by such Registration Statement, promptly after the Company receives notice thereof,
of the time when such registration statement has been declared effective or a supplement to any Prospectus forming a part of such registration statement has been filed; 

3.1.9 at least five (5) days prior to the filing of any Registration Statement or Prospectus or any amendment or supplement to such
Registration Statement or Prospectus or any document that is to be incorporated by reference into such Registration Statement or Prospectus, furnish a copy thereof to each seller of such Registrable Securities or its counsel; 

3.1.10 notify the Holders at any time when a Prospectus relating to such Registration Statement is required to be delivered under the
Securities Act, of the happening of any event as a result of which the Prospectus included in such Registration Statement, as then in effect, includes a Misstatement, and then to correct such Misstatement as set forth in
Section 3.4 hereof; 
 3.1.11 permit a representative of the Holders (such representative to be selected by a majority-in-interest of the participating Holders), the Underwriters, if any, and any attorney or accountant retained by such Holders or Underwriter to participate, at each
such person’s own expense, in the preparation of the Registration Statement, and cause the Company’s officers, directors and employees to supply all information reasonably requested by any such representative, Underwriter, attorney or
accountant in connection with the Registration; provided, that such representatives or Underwriters enter into a confidentiality agreement, in form and substance reasonably satisfactory to the Company, prior to the release or disclosure of
any such information; 

  
 12 

 3.1.12 obtain a “comfort” letter from the Company’s independent registered
public accountants in the event of an Underwritten Registration, in customary form and covering such matters of the type customarily covered by “comfort” letters as the managing Underwriter may reasonably request, and may be found
reasonably satisfactory to a majority-in-interest of the participating Holders; 

3.1.13 on the date the Registrable Securities are delivered for sale pursuant to such Registration, obtain an opinion, dated such date, of
counsel representing the Company for the purposes of such Registration, addressed to the Holders, the placement agent or sales agent, if any, and the Underwriters, if any, covering such legal matters with respect to the Registration in respect of
which such opinion is being given as the Holders, placement agent, sales agent, or Underwriter may reasonably request and as are customarily included in such opinions and negative assurance letters, and may be found reasonably satisfactory to a
majority in interest of the participating Holders; 
 3.1.14 in the event of any Underwritten Offering, enter into and perform its
obligations under an underwriting agreement, in usual and customary form, with the managing Underwriters of such offering; 
 3.1.15 make
available to its security holders, as soon as reasonably practicable, an earnings statement covering the period of at least twelve (12) months beginning with the first day of the Company’s first full calendar quarter after the effective
date of the Registration Statement which satisfies the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any successor rule promulgated thereafter by the Commission); 

3.1.16 if the Registration involves the Registration of Registrable Securities involving gross proceeds in excess of $25,000,000, use its
reasonable efforts to make available senior executives of the Company to participate in customary “road show” presentations that may be reasonably requested by the Underwriter in any Underwritten Offering; and 

3.1.17 otherwise, in good faith, cooperate reasonably with, and take such customary actions as may reasonably be requested by the Holders, in
connection with such Registration. 
 Section 3.2 Registration Expenses. Except as otherwise provided
herein, the Registration Expenses of all Registrations shall be borne by the Company. It is acknowledged by the Holders that the Holders shall bear all incremental selling expenses relating to the sale of Registrable Securities, such as
Underwriters’ commissions and discounts, brokerage fees, Underwriter marketing costs and, other than as set forth in the definition of “Registration Expenses,” all reasonable fees and expenses of any legal counsel representing
the Holders or such Holder. 

  
 13 

 Section 3.3 Requirements for Participation in Underwritten
Offerings. No person may participate in any Underwritten Offering for equity securities of the Company pursuant to a Registration initiated by the Company hereunder unless such person or entity(i) agrees to sell such person’s or
entity’s securities on the basis provided in any underwriting arrangements approved by the Company and (ii) completes and executes all customary questionnaires, powers of attorney, indemnities,
lock-up agreements, underwriting agreements and other customary documents as may be reasonably required under the terms of such underwriting arrangements. 

Section 3.4 Suspension of Sales; Adverse Disclosure. Upon receipt of written notice from the Company that a
Registration Statement or Prospectus contains a Misstatement, each of the Holders shall forthwith discontinue disposition of Registrable Securities until such Holder has received copies of a supplemented or amended Prospectus correcting the
Misstatement (it being understood that the Company hereby covenants to prepare and file such supplemented or amended Prospectus as soon as practicable after the time of such notice), or until such Holder is advised in writing by the Company that the
use of the Prospectus may be resumed. If the filing, initial effectiveness or continued use of a Registration Statement in respect of any Registration at any time (a) would require the Company to make an Adverse Disclosure, (b) would
require the inclusion in such Registration Statement of financial statements that are unavailable to the Company for reasons beyond the Company’s control, or (c) in the good faith judgment of the Board, which judgment shall be documented
in writing and provided to the Holders in the form of a written certificate signed by the Chairman of the Board or the Chief Executive Officer, the Company may, upon giving prompt written notice of such action to the Holders, delay the filing or
initial effectiveness of, or suspend use of, such Registration Statement for the shortest period of time, but in no event more than sixty (60) days, determined in good faith by the Company to be necessary for such purpose. In the event the
Company exercises its rights under the preceding sentence, the Holders agree to suspend, immediately upon their receipt of the notice referred to above, their use of the Prospectus relating to any Registration in connection with any sale or offer to
sell Registrable Securities. The Company shall immediately notify the Holders of the expiration of any period during which it exercised its rights under this Section 3.4, and upon the expiration of such period the Holders
shall be entitled to resume the use of any such Prospectus in connection with any sale or offer to sell Registrable Securities, and upon the expiration of such period the Holders shall be entitled to resume the use of any such Prospectus in
connection with any sale or offer to sell Registrable Securities. 
 Section 3.5 Reporting Obligations. As long as
any Holder shall own Registrable Securities, the Company, at all times while it shall be reporting under the Exchange Act, covenants to file timely (or obtain extensions in respect thereof and file within the applicable grace period) all reports
required to be filed by the Company after the date hereof pursuant to Sections 13(a) or 15(d) of the Exchange Act and to promptly furnish the Holders with true and complete copies of all such filings. The Company
further covenants that it shall take such further action as any Holder may reasonably request, all to the extent required from time to time to enable such Holder to sell Registrable Securities held by such Holder without registration under the
Securities Act within the limitation of the exemptions provided by Rule 144 promulgated under the Securities Act (or any successor rule promulgated thereafter by the Commission), including providing any legal opinions. Upon the request of any
Holder, the Company shall deliver to such Holder a written certification of a duly authorized officer as to whether it has complied with such requirements. 

  
 14 

 ARTICLE IV 

INDEMNIFICATION AND CONTRIBUTION 

Section 4.1 Indemnification by the Company. The Company agrees to indemnify, to the extent
permitted by law, and hold harmless each Holder of Registrable Securities, its officers and directors and each person who controls such Holder (within the meaning of the Securities Act) from and against any losses, claims, damages, liabilities and
expenses (including reasonable attorneys’ fees) caused by any untrue or alleged untrue statement of material fact contained in any Registration Statement, Prospectus or preliminary Prospectus, or any amendment or supplement to any of them, or
any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as the same is contained in any information furnished in writing to the Company by the
Holder expressly for use therein. The Company also shall indemnify any Underwriter of the Registrable Securities, their officers and directors and each person who controls such Underwriter (within the meaning of the Securities Act) on substantially
the same basis as that of the indemnification of the Holder provided in this Section 4.1. 

Section 4.2 Indemnification by Holders of Registrable Securities. In connection with any Registration Statement in
which a Holder of Registrable Securities is participating, such Holder shall furnish to the Company in writing such information and affidavits as the Company reasonably requests for use in connection with any such Registration Statement or
Prospectus and, to the extent permitted by law, shall indemnify the Company, its directors and officers and agents and each person who controls the Company (within the meaning of the Securities Act) against any losses, claims, damages, liabilities
and expenses (including without limitation reasonable attorneys’ fees) resulting from any untrue statement of material fact contained in the Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement
thereto or any omission of a material fact required to be stated therein or necessary to make the statements therein not misleading, but only to the extent that such untrue statement or omission is contained in any information or affidavit so
furnished in writing by such Holder expressly for use therein; provided, that the obligation to indemnify shall be several, not joint and several, among such Holders of Registrable Securities, and the liability of each such Holder of
Registrable Securities shall be in proportion to and limited to the net proceeds received by such Holder from the sale of Registrable Securities pursuant to such Registration Statement. Each Holder shall indemnify any Underwriter of Registrable
Securities sold by such Holder, their officers, directors and each person who controls such Underwriters (within the meaning of the Securities Act) to the same extent as provided in the foregoing with respect to indemnification of the Company. 

Section 4.3 Conduct of Indemnification Proceedings. Any person entitled to indemnification herein shall
(i) give prompt written notice to the indemnifying party of any claim with respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s right to indemnification hereunder to the
extent such failure has not materially prejudiced the indemnifying party) and (ii) unless in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties may exist with respect to
such claim, permit such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to the indemnified party. If such defense is assumed, the indemnifying party shall not be subject to any liability for any settlement
made by the indemnified party without its consent (but such consent shall not be unreasonably withheld). An 

  
 15 

 
indemnifying party who is not entitled to, or elects not to, assume the defense of a claim shall not be obligated to pay the fees and expenses of more than one counsel for all parties indemnified
by such indemnifying party with respect to such claim, unless in the reasonable judgment of any indemnified party a conflict of interest may exist between such indemnified party and any other of such indemnified parties with respect to such claim.
No indemnifying party shall, without the consent of the indemnified party, consent to the entry of any judgment or enter into any settlement which cannot be settled in all respects by the payment of money (and such money is so paid by the
indemnifying party pursuant to the terms of such settlement) or which settlement does not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release from all liability in respect to such
claim or litigation. 
 Section 4.4 Survival. The indemnification provided for under this Agreement shall
remain in full force and effect regardless of any investigation made by or on behalf of the indemnified party or any officer, director or controlling person of such indemnified party and shall survive the transfer of securities. The Company and each
Holder of Registrable Securities participating in an offering also agrees to make such provisions as are reasonably requested by any indemnified party for contribution to such party in the event the Company’s or such Holder’s
indemnification is unavailable for any reason. 
 Section 4.5 Contribution. If the indemnification provided under
Sections 4.1 and 4.2 hereof from the indemnifying party is unavailable or insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities and expenses referred to herein,
then the indemnifying party, in lieu of indemnifying the indemnified party, shall contribute to the amount paid or payable by the indemnified party as a result of such losses, claims, damages, liabilities and expenses in such proportion as is
appropriate to reflect the relative fault of the indemnifying party and the indemnified party, as well as any other relevant equitable considerations. The relative fault of the indemnifying party and indemnified party shall be determined by
reference to, among other things, whether any action in question, including any untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact, was made by, or relates to information supplied by, such
indemnifying party or indemnified party, and the indemnifying party’s and indemnified party’s relative intent, knowledge, access to information and opportunity to correct or prevent such action; provided, that the liability of any
Holder under this Section 4.5 shall be limited to the amount of the net proceeds received by such Holder in such offering giving rise to such liability. The amount paid or payable by a party as a result of the losses or
other liabilities referred to above shall be deemed to include, subject to the limitations set forth in Sections 4.1, 4.2 and 4.3 above, any legal or other fees, charges or expenses reasonably incurred by such
party in connection with any investigation or proceeding. The parties hereto agree that it would not be just and equitable if contribution pursuant to this Section 4.5 were determined by pro rata allocation or by any other
method of allocation, which does not take account of the equitable considerations referred to in this Section 4.5. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities
Act) shall be entitled to contribution pursuant to this Section 4.5 from any person who was not guilty of such fraudulent misrepresentation. 

  
 16 

 ARTICLE V 

LOCK-UP 

Section 5.1 Lock-Up. 

5.1.1 Except as permitted by Section 5.2, during the Lock-up Period, each
Significant Holder shall not Transfer any shares of Common Stock beneficially owned or owned of record by such Significant Holder. 

Section 5.2 Exceptions. The provisions of Section 5.1 shall not apply to:

 5.2.1 transactions relating to shares of Common Stock acquired in open market transactions; 

5.2.2 transactions relating to shares of Common Stock acquired pursuant to the Subscription Agreements in the Private Placements; 

5.2.3 Transfers of shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock as a bona fide gift;

 5.2.4 Transfers of shares of Common Stock to a trust, or other entity formed for estate planning purposes for the primary benefit of the
spouse, domestic partner, parent, sibling, child or grandchild of the undersigned or any other person with whom the undersigned has a relationship by blood, marriage or adoption not more remote than first cousin; 

5.2.5 Transfers by will or intestate succession upon the death of the undersigned; 

5.2.6 the Transfer of shares of Common Stock pursuant to a qualified domestic order or in connection with a divorce settlement; 

5.2.7 if the undersigned is a corporation, partnership (whether general, limited or otherwise), limited liability company, trust or other
business entity, (i) Transfers to another corporation, partnership, limited liability company, trust or other business entity that controls, is controlled by or is under common control or management with the undersigned, or
(ii) distributions of shares of Common Stock to partners, limited liability company members or stockholders of the undersigned; 
 5.2.8
Transfers to the Company’s officers, directors or their affiliates; 
 5.2.9 pledges of shares of Common Stock as security or collateral
in connection with any borrowing or the incurrence of any indebtedness by any Holder (provided such borrowing or incurrence of indebtedness is secured by a portfolio of assets or equity interests issued by multiple issuers); 

5.2.10 Transfers pursuant to a bona fide third-party tender offer, merger, stock sale, recapitalization, consolidation or other transaction
involving a Change in Control of the Company, provided that in the event that such tender offer, merger, recapitalization, consolidation or other such transaction is not completed, the Common Stock subject to this Agreement shall remain subject to
this Agreement; 

  
 17 

 5.2.11 the establishment of a trading plan pursuant to Rule 10b5-1 promulgated under
the Exchange Act, provided that such plan does not provide for the transfer of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock during the Lock-Up Period; 

5.2.12 Transfers of shares of Common Stock to satisfy tax withholding obligations in connection with the exercise of options to purchase shares
of Common Stock or the vesting or stock-based awards; and 
 5.2.13 Transfers of shares of Common Stock in payment on a “net
exercise” or “cashless” basis of the exercise or purchase price with respect to the exercise of options to purchase shares of Common Stock; 

provided, that in the case of any Transfer or distribution pursuant to Sections 5.2.2 through 5.2.7,
each donee, distributee or other transferee shall agree in writing, in form and substance reasonably satisfactory to the Company, to be bound by the provisions of this Agreement. 

ARTICLE VI 
 GENERAL
PROVISIONS 
 Section 6.1 Entire Agreement. This Agreement (including Schedule A hereto)
constitutes the entire understanding and agreement between the parties as to the matters covered herein and supersedes and replaces any prior understanding, agreement or statement of intent, in each case, written or oral, of any and every nature
with respect thereto. 
 Section 6.2 Termination. This Agreement shall terminate upon the earliest to occur
of: (i) the termination of the Business Combination Agreement, and (ii) the date on which neither the Holders nor any of their permitted assignees hold any Registrable Securities. 

Section 6.3 Notices. Any notice or other communication required or permitted to be delivered to any party
under this Agreement shall be in writing and shall be deemed properly delivered, given and received (a) upon receipt when delivered by hand, (b) upon transmission, if sent by facsimile or electronic transmission (in each case with receipt
verified by electronic confirmation), or (c) one (1) Business Day after being sent by courier or express delivery service, specifying next day delivery, with proof of receipt. The addresses, email addresses and facsimile numbers for
such notices and communications are those set forth on the signature pages hereof, or such other address, email address or facsimile numbers as may be designated in writing hereafter, in the same manner, by any such person. 

Section 6.4 Assignment; No Third-Party Beneficiaries. This Agreement and the rights, duties and obligations
of the Company hereunder may not be assigned or delegated by the Company in whole or in part. This Agreement and the rights, duties and obligations of the Holders hereunder may be freely assigned or delegated by such Holder in conjunction with and
to the extent of any transfer of Common Stock by any such Holder. This Agreement and the provisions hereof 

  
 18 

 
shall be binding upon and shall inure to the benefit of each of the parties and the permitted assigns of the applicable Holder or of any assignee of the applicable Holder. This Agreement is not
intended to confer any rights or benefits on any persons that are not party hereto other than as expressly set forth in Article IV and this Section 6.3. No assignment by any party hereto of such party’s rights,
duties and obligations hereunder shall be binding upon or obligate the Company unless and until the Company shall have received (i) written notice of such assignment and (ii) the written agreement of the assignee, in a form reasonably
satisfactory to the Company, to be bound by the terms and provisions of this Agreement (which may be accomplished by an addendum or certificate of joinder to this Agreement). 

Section 6.5 Counterparts. This Agreement may be executed in one or more counterparts, all of which shall be
considered one and the same agreement and shall become effective when one or more counterparts have been signed by each of the parties and delivered to the other parties, it being understood that all parties need not sign the same counterpart and
such counterparts may be delivered by the parties hereto via facsimile or electronic transmission. 

Section 6.6 Amendment; Waiver. This Agreement may be amended or modified, and any provision hereof may
be waived, in whole or in part, at any time pursuant to an agreement in writing executed by the Company and Holders holding a majority of the Registrable Securities at such time; provided, however, that notwithstanding the foregoing,
any amendment hereto or waiver hereof that adversely affects one Holder, solely in his, her or its capacity as a holder of the shares of capital stock of the Company, in a manner that is materially different from the other Holders (in such capacity)
shall require the consent of the Holder so affected. Any failure by any party at any time to enforce any of the provisions of this Agreement shall not be construed a waiver of such provision or any other provisions hereof. 

Section 6.7 Severability. In the event that any provision of this Agreement or the application thereof
becomes or is declared by a court of competent jurisdiction to be illegal, void or unenforceable, the remainder of this Agreement will continue in full force and effect and the application of such provision to other persons or circumstances will be
interpreted so as reasonably to effect the intent of the parties hereto. 
 Section 6.8 Governing Law;
Venue. 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, provided, however, that if jurisdiction is not then available in the Delaware Chancery Court, then any such legal Action may be brought in any federal court located in the State of
Delaware or any other Delaware state court. The parties hereto hereby (i) 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 hereto, and (ii) agree not to commence any Action relating thereto except in the courts described above in Delaware, other than Actions in any court of competent jurisdiction to
enforce any judgment, decree or award rendered by any such court in Delaware 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 

  
 19 

 
or otherwise, in any Action arising out of or relating to this Agreement or the Transactions, (a) any claim that it is not personally subject to the jurisdiction of the courts in Delaware 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. 
 Section 6.9 Waiver of Jury Trial. 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 6.9.

 Section 6.10 Specific Performance. Each party acknowledges and agrees that the other parties hereto
would be irreparably harmed and would not have any adequate remedy at law in the event that any of the provisions of this Agreement were not performed by such first party in accordance with their specific terms or were otherwise breached by such
first party. Accordingly, each party agrees that the other parties hereto shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, this being in
addition to any other remedy to which such parties are entitled at law or in equity. 
 [Signature Page Follows.] 

 

  
 20 

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

			
	COMPANY:
	
	BROOKLINE CAPITAL ACQUISITION CORP.
		
	By:	 	 /s/ Dr. Samuel P. Westheimer

	Name: Dr. Samuel P. Westheimer
	Title: Chief Executive Officer and Chairman

  

			
	
	Address for Notice:
	
	280 Park Avenue
	
	Suite 43W
	
	New York, NY 10017
		
	Telephone No.:	 	 (646) 603-6716

		
	Facsimile No.:	 	 ***

		
	Email Address:	 	 ***

 [Signature Page to Registration Rights and Lock-Up Agreement]

 IN WITNESS WHEREOF, each of the undersigned has executed this Agreement as of the date first
written above. 
  

			
	HOLDER:
		
	By:	 	              

	
	Address for Notice:

  

			
	
	          

	
	  

	
	  

		
	Telephone No.:	 	              

		
	Facsimile No.:	 	  

		
	Email Address:	 	  

 [Signature Page to Registration Rights and Lock-Up Agreement]

 Schedule A 

Holders 
  

					
	 Name of Holder
	 	 Number of Shares
	 	 Lock-Up
PeriodEX-10.3

 Exhibit 10.3 

SPONSOR SUPPORT AGREEMENT 

This SPONSOR SUPPORT AGREEMENT (this “Agreement”), dated as of March 17, 2022, is entered into by and among Brookline
Capital Holdings, LLC, a Delaware limited liability company (the “Sponsor”), Brookline Capital Acquisition Corp., a Delaware corporation (“BCAC”), and Apexigen, Inc., a Delaware corporation (the
“Company”). 
 RECITALS 

WHEREAS, concurrently herewith, the Company, Project Barolo Merger Sub, LLC, a Delaware limited liability company (“Merger
Sub”), and BCAC are entering into a Business Combination Agreement (as amended, supplemented, restated or otherwise modified from time to time, the “BCA”), pursuant to which (and subject to the terms and conditions set
forth therein) Merger Sub will merge with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of BCAC; 

WHEREAS, capitalized terms used but not otherwise defined in this Agreement shall have the meanings ascribed to them in the BCA; and

 WHEREAS, as a condition and inducement to the willingness of BCAC and the Company to enter into the BCA, BCAC, the Company and the
Sponsor are entering into this Agreement. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements set forth herein, and for other good and
valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the Sponsor, BCAC and the Company hereby agree as follows: 

1. Voting Agreement. The Sponsor hereby unconditionally and irrevocably agrees that during the period from the date hereof through the
Termination Date as determined in accordance with Section 24, at the BCAC Stockholders’ Meeting or at any other meeting of the stockholders of BCAC (whether annual or special and whether or not an adjourned or
postponed meeting, however called and including any adjournment or postponement thereof) and in connection with any action by written consent of the stockholders of BCAC requested by the BCAC Board or undertaken as contemplated by the Transactions,
the Sponsor shall: 
 (a) when such meeting is held, appear at such meeting or otherwise cause all shares of BCAC Common Stock or any other
voting securities of BCAC which it holds, owns or is entitled to vote, whether as shares or as a constituent part of a unit of securities and whether owned as of the date of or later acquired (the “Sponsor Shares”), to be counted as
present thereat for the purpose of establishing a quorum; 

 (b) vote (or execute and return an action by written consent), or cause to be voted at such
meeting (or validly execute and return and cause such consent to be granted with respect to), all of the Sponsor Shares in favor of (i) the approval and adoption of the BCA and approval of the Merger and all other transactions contemplated by
the BCA and (ii) 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 BCAC under the BCA or that would reasonably be expected
to result in the failure of the Merger from being consummated and (iii) each of the proposals and any other matters necessary or reasonably requested by BCAC for consummation of the Merger and the other transactions contemplated by the BCA; and

 (c) vote (or execute and return an action by written consent), or cause to be voted at such meeting (or validly execute and return and
cause such consent to be granted with respect to), all of the Sponsor Shares against (i) any Business Combination Proposal other than with the Company and (ii) any other action that would reasonably be expected to (x) materially
impede, interfere with, delay, postpone or adversely affect the Merger or any of the other transactions contemplated by the BCA, or (y) result in a breach of any covenant, representation or warranty or other obligation or agreement of the
Sponsor contained in this Agreement. 
 2. Sponsor Promote Adjustment. In connection with the consummation of the Transactions,
Sponsor agrees that, subject to the satisfaction or waiver of each of the conditions to Closing set forth in Sections 8.01, 8.02 and 8.03 of the BCA, immediately prior to the Effective Time, in the event the BCAC Related Funds
Amount at Closing that are available to the Company are less than $20,000,000, that number of Sponsor Shares (the “Surrendered Shares”) equal to (x) one (1) minus the quotient of the BCAC Related Funds Amount divided by
$20,000,000, multiplied by (y) one-third (1/3) of the total number of Sponsor Shares, shall be deemed automatically forfeited and cancelled without any further actions by the Sponsor or any other Person,
and such Surrendered Shares will be recorded as cancelled by the Company. 
 3. Transfer of Shares. Except as otherwise contemplated
by the BCA or this Agreement, the Sponsor agrees that prior to the Termination Date it shall not, without the consent of the Company, directly or indirectly, (a) offer for sale, sell, assign, transfer (including by operation of law), create any
lien or pledge, dispose of or otherwise encumber any of the Sponsor Shares (any of the forgoing, a “Transfer”) or otherwise agree to do any of the foregoing, (b) deposit any Sponsor 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 requiring the Transfer of any Sponsor
Shares. The Sponsor expressly agrees to continue to comply with the restrictions on transfer of the Sponsor Shares set forth in Section 7 of that certain side letter between the Sponsor and BCAC dated January 28, 2021, and neither the
Company nor BCAC shall agree to any waiver, amendment or modification of such provisions without the prior written consent of the Company. Notwithstanding the foregoing, this Section 3 shall also not prohibit a Transfer of Sponsor Shares by
Sponsor to an affiliate of Sponsor; provided, that such Transfer shall be permitted only if, prior to or in connection with such Transfer, the transferee agrees in writing, reasonably satisfactory in form and substance to the Company, to assume all
of the obligations of Sponsor hereunder and to be bound by the terms of this Agreement. 
 4. No Solicitation of Transactions. The
Sponsor agrees prior to the Termination Date not to directly or indirectly, through any of its affiliates or Representatives, (a) solicit, initiate or knowingly encourage (including by furnishing information) the submission of, or participate
in any discussions or negotiations with, any Person (other than the Company or its affiliates or 

  
 2 

 
Representatives), concerning, relating to or which is intended or is reasonably likely to give rise to or result in, a Business Combination Proposal in respect of BCAC other than with the
Company. Sponsor shall, and shall cause its affiliates and Representatives to, immediately cease any and all existing discussions or negotiations with any Person (other than with the Company, its stockholders and their respective affiliates and
Representatives) conducted prior to the date hereof with respect to, or which is reasonably likely to give rise to or result in, a Business Combination Proposal in respect of BCAC. If the Sponsor or any of its affiliates or Representatives receives
any inquiry or proposal with respect to a Business Combination Proposal in respect of BCAC, then Sponsor shall promptly (and in no event later than twenty-four (24) hours after the Sponsor becomes aware of such inquiry or proposal) notify such
Person in writing that BCAC is subject to an exclusivity agreement with respect to the Merger that prohibits Sponsor from considering such inquiry or proposal and, in such event, Sponsor shall also promptly notify the Company of such facts and
circumstances (provided that Sponsor shall not be obligated to provide such notice in violation of any obligation of confidentiality owed to any third party or any Law). 

5. Representations and Warranties of the Sponsor. The Sponsor hereby represents and warrants to BCAC and the Company as follows: 

(a) The Sponsor is the only record and a beneficial owner (within the meaning of Rule 13d-3 under the
Exchange Act) of, and has good, valid and marketable title to, the Sponsor Shares (which, as of the date hereof, consists of 1,428,250 shares of BCAC Common Stock), free and clear of Liens other than as created by this Agreement or Sponsor’s
organizational documents or the organizational documents of BCAC (including, without limitation, for the purposes hereof, any agreement between or among stockholders of BCAC). 

(b) The Sponsor (i) has full voting power, full power of disposition and full power to issue instructions with respect to the matters set
forth herein, in each case, with respect to the Sponsor Shares, (ii) has not entered into any voting agreement or voting trust with respect to any of the Sponsor Shares that is inconsistent with the Sponsor’s obligations pursuant to this
Agreement, (iii) has not granted a proxy or power of attorney with respect to any of the Sponsor Shares that is inconsistent with the Sponsor’s obligations pursuant to this Agreement and (iv) has not entered into any agreement or
undertaking that is otherwise inconsistent with, or would interfere with, or prohibit or prevent it from satisfying, its obligations pursuant to this Agreement. 

(c) The Sponsor (i) is a legal entity duly organized, validly existing and, to the extent such concept is applicable, in good standing
under the Laws of the jurisdiction of its organization and (ii) has all requisite limited liability company or other power and authority and has taken all limited liability company or other action necessary in order to, execute, deliver and
perform its obligations under this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly executed and delivered by the Sponsor and constitutes a valid and binding agreement of the Sponsor enforceable against
the Sponsor in accordance with its terms, subject to applicable bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and similar Laws affecting creditors’ rights generally and subject, as to enforceability, to general
principles of equity. 

  
 3 

 (d) Other than the filings, notices and reports pursuant to, in compliance with or required
to be made under the Exchange Act, no filings, notices, reports, consents, registrations, approvals, permits, waivers, expirations of waiting periods or authorizations are required to be obtained by the Sponsor from, or to be given by the Sponsor
to, or be made by the Sponsor with, any Governmental Authority in connection with the execution, delivery and performance by the Sponsor of this Agreement, the consummation of the transactions contemplated hereby or the Merger and the other
transactions contemplated by the BCA. 
 (e) The execution, delivery and performance of this Agreement by the Sponsor does not, and the
consummation of the transactions contemplated hereby or the Merger and the other transactions contemplated by the BCA will not, constitute or result in (i) a breach or violation of, or a default under, the limited liability company agreement or
similar governing documents of the Sponsor, (ii) with or without notice, lapse of time or both, a breach or violation of, a termination (or right of termination) of or a default under, the loss of any benefit under, the creation, modification
or acceleration of any obligations under or the creation of a Lien on any of the properties, rights or assets of the Sponsor pursuant to any contract binding upon the Sponsor or (iii) any change in the rights or obligations of any party under
any contract legally binding upon the Sponsor, except, in the case of clause (ii) or (iii) directly above, for any such breach, violation, termination, default, creation, acceleration or change that would not, individually or in the aggregate,
reasonably be expected to prevent or materially delay or impair the Sponsor’s ability to perform its obligations hereunder or to consummate the transactions contemplated hereby, the consummation of the Merger or the other transactions
contemplated by the BCA. 
 (f) As of the date of this Agreement, there is no action, proceeding or investigation pending against the
Sponsor or, to the knowledge of the Sponsor, threatened against the Sponsor that questions the beneficial or record ownership of the Sponsor Shares, the validity of this Agreement or the performance by the Sponsor of its obligations under this
Agreement. 
 (g) The Sponsor understands and acknowledges that each of BCAC and the Company is entering into the BCA in reliance upon the
Sponsor’s execution and delivery of this Agreement and the representations, warranties, covenants and other agreements of the Sponsor contained herein 

6. Further Assurances. From time to time, at either BCAC’s or the Company’s request and without further consideration, the
Sponsor shall execute and deliver such additional documents and take all such further action as may be reasonably necessary or reasonably requested to effect the actions and consummate the transactions contemplated by this Agreement. 

7. Amendment and Modification. This Agreement may not be amended, modified or supplemented in any manner, whether by course of conduct
or otherwise, except by an instrument in writing signed by the Sponsor, BCAC and the Company. 
 8. Waiver. No failure or delay by
any party hereto exercising any right, power or privilege hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or
privilege. The rights and remedies of the parties hereto hereunder are cumulative and are not exclusive of any rights or remedies which they would otherwise have hereunder. Any agreement on the part of a party hereto to any such waiver shall be
valid only if set forth in a written instrument executed and delivered by such party. 

  
 4 

 9. Notices. All notices and other communications hereunder shall be in writing and
shall be deemed given if delivered personally, by email (with confirmation of receipt) or sent by a nationally recognized overnight courier service to the parties hereto at the following addresses (or at such other address for a party as shall be
specified by like notice made pursuant to this Section 9): 
 if to Sponsor, BCAC or Merger Sub:

 Brookline Capital Acquisition Corp. 

280 Park Avenue, Suite 43W 

New York, NY 10017 

Attention: Samuel P. Wertheimer, Chairman and CEO 

Email: *** 

with a copy to: 

DLA Piper LLP (US) 

1251 Avenue of the Americas 

New York, NY 10020 

Attention: James Kelly; Peter Ekberg 

Email: james.kelly@us.dlapiper.com; peter.ekberg@us.dlapiper.com 

and 

DLA Piper LLP (US) 

555 Mission Street 

Suite 2400 

San Francisco, CA 94105 

Attention: Jeffrey Selman 

Email: jeffrey.selman@us.dlapiper.com 

if to the Company: 

Apexigen, Inc. 

75 Shoreway Road 

Suite C 

San Carlos, CA 94070 

Attention: Xiaodong Yang, MD, PhD, President and CEO; 

                Amy Wong, Senior Vice
President, Finance and Operations 
 Email: *** 

  
 5 

 with a copy to: 

Wilson Sonsini 

650 Mill Page Road 

Palo Alto, CA 94304 

Attention: Kenneth A. Clark; Michael E. Coke; Lance E. Brady 

Email: kclark@wsgr.com; mcoke@wsgr.com; lbrady@wsgr.com 

and with a copy to: 

Wilson Sonsini 

One Market Plaza, Spear Tower, Suite 3300 

San Francisco, CA 94105 

Attention: Robert T. Ishii 

Email: rishii@wsgr.com 

10. Entire Agreement. This Agreement, the BCA and the Transaction Documents constitute the entire agreement and supersede all prior
agreements and understandings, both written and oral, among the parties hereto with respect to the subject matter hereof and thereof. 
 11.
No Third-Party Beneficiaries. The Sponsor hereby agrees that its representations, warranties and covenants set forth herein are solely for the benefit of BCAC and the Company in accordance with and subject to the terms of this Agreement, and
this Agreement is not intended to, and does not, confer upon any person other than the parties hereto any rights or remedies hereunder, including, without limitation, the right to rely upon the representations and warranties set forth herein, and
the parties hereto hereby further agree that this Agreement may only be enforced against, and any action that may be based upon, arise out of or relate to this Agreement, or the negotiation, execution or performance of this Agreement may only be
made against, the persons expressly named as parties hereto. 
 12. Governing Law and Venue. This Agreement shall be governed by,
interpreted under, and construed in accordance with the internal laws of the State of Delaware applicable to agreements made and to be performed within the State of Delaware, without giving effect to any choice-of-law provisions thereof that would compel the application of the substantive laws of any other jurisdiction 

13. Assignment; Successors. Neither this Agreement nor any of the rights, interests or obligations hereunder shall be assigned by any
of the parties hereto in whole or in part (whether by operation of Law or otherwise) without the prior written consent of the other party, and any such assignment without such consent shall be null and void. This Agreement shall be binding upon,
inure to the benefit of and be enforceable by the parties hereto and their respective successors and permitted assigns. 

  
 6 

 14. No Recourse. Notwithstanding anything to the contrary contained herein or
otherwise, but without limiting any provision in the BCA or any other Transaction Document, this Agreement may only be enforced against, and any claims or causes of action that may be based upon, arise out of or relate to this Agreement, or the
negotiation, execution or performance of this Agreement or the transactions contemplated hereby, may only be made against the entities and Persons that are expressly identified as parties to this Agreement in their capacities as such and no former,
current or future shareholders or stockholders, equity holders, controlling persons, directors, officers, employees, general or limited partners, members, managers, agents or affiliates of any party hereto, or any former, current or future direct or
indirect shareholder or stockholder, equity holder, controlling person, director, officer, employee, general or limited partner, member, manager, agent or affiliate of any of the foregoing (each, a
“Non-Recourse Party”) shall have any liability for any obligations or liabilities of the parties to this Agreement or for any claim (whether in tort, contract or otherwise) based on, in
respect of, or by reason of, the transactions contemplated hereby or in respect of any oral representations made or alleged to be made in connection herewith. Without limiting the rights of any party against the other parties hereto, in no event
shall any party or any of its affiliates seek to enforce this Agreement against, make any claims for breach of this Agreement against, or seek to recover monetary damages from, any Non-Recourse Party. 

15. Specific Performance. Each party acknowledges and agrees that the other parties hereto would be irreparably harmed and would not
have any adequate remedy at law in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. Accordingly, each party agrees that the other parties hereto shall be
entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, this being in addition to any other remedy to which such parties are entitled at law or in equity.

 16. Severability. In the event that any provision of this Agreement or the application thereof becomes or is declared by a court
of competent jurisdiction to be illegal, void or unenforceable, the remainder of this Agreement will continue in full force and effect and the application of such provision to other persons or circumstances will be interpreted so as reasonably to
effect the intent of the parties hereto. 
 17. Counterparts. This Agreement may be executed in one or more counterparts, all of
which shall be considered one and the same agreement, it being understood that each party need not sign the same counterpart. This Agreement shall become effective when each party shall have received a counterpart hereof signed by all of the other
parties. Signatures delivered electronically or by facsimile shall be deemed to be original signatures. 
 18. Survival of
Representations and Warranties. None of the representations and warranties made by the parties hereto in this Agreement shall survive the Closing. 

19. Headings and Captions. The headings and captions of the various subdivisions of this Agreement are for convenience of reference
only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 
 20. Construction.
The words “include,” “includes,” and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be construed to include any other gender, and
words in the singular form will be construed to include the plural and vice versa, unless the context otherwise requires. The words “this Agreement,” 

  
 7 

 
“herein,” “hereof,” “hereby,” “hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular subdivision unless
expressly so limited. The word “or” shall be disjunctive but not exclusive. The parties hereto intend that each representation, warranty, and covenant contained herein will have independent significance. If any party hereto has breached
any representation, warranty, or covenant contained herein in any respect, the fact that there exists another representation, warranty or covenant relating to the same subject matter (regardless of the relative levels of specificity) which such
party has not breached will not detract from or mitigate the fact that such party is in breach of the first representation, warranty, or covenant. 

21. Mutual Drafting. This Agreement is the joint product of the parties hereto and each provision hereof has been subject to the mutual
consultation, negotiation and agreement of the parties hereto and shall not be construed for or against any party. 
 22. No Ownership
Interest. Nothing contained in this Agreement shall be deemed to vest in the Company, or any of its affiliates or Representatives, any direct or indirect ownership or incidence of ownership of or with respect to any Sponsor Shares. 

23. No Partnership, Agency or Joint Venture. This Agreement is intended to create a contractual relationship among Sponsor and the Company,
and is not intended to create, and does not create, any agency, partnership, joint venture or any like relationship between or among the parties. 

24. Termination. This Agreement shall terminate upon the earliest of (i) the termination of the BCA in accordance with its terms,
and (ii) the time this Agreement is terminated upon the mutual written agreement of BCAC, the Company and the Sponsor (the earliest such date under clause (i) and (ii) being referred to herein as the “Termination Date”);
provided, that the provisions set forth in Sections 1, 3 and 4 shall no longer be effective from and after the Closing of the Merger; provided further, that the provisions set forth in Sections
9 through 24 shall survive the Termination Date. 
 [Signature Pages Follow] 

  
 8 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed (where
applicable, by their respective officers or other authorized persons thereunto duly authorized) as of the date first written above. 
  

	
	 BCAC:
 BROOKLINE CAPITAL ACQUISTION
CORP.

	
	 /s/ Dr. Samuel P. Wertheimer

	Name: Dr. Samuel P. Wertheimer
	Title: Chief Executive Officer and Chairman
	
	SPONSOR:
	BROOKLINE CAPITAL HOLDINGS, LLC
	
	 /s/ William B. Buchanan, Jr.

	Name: William B. Buchanan, Jr.
	Title: Managing Partner
	
	 THE COMPANY:
 APEXIGEN,
INC.

	
	 /s/ Xiaodong Yang

	Name: Xiaodong Yang
	Title: Chief Executive Officer

 [Signature Page to Sponsor Support Agreement]

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