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 Annex E  

 
    FORM OF AGREEMENT    
    

 
    AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT    
    

        THIS AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of
[    ·    ] is made and entered into by and among Avista Healthcare Public Acquisition
Corp., a Cayman Islands exempted company (the "Company"), Avista Acquisition Corp., a Cayman Islands exempted company (the
"Sponsor"), the undersigned parties listed under Existing Holders on the signature page hereto (each such party, together with the Sponsor and any
person or entity deemed an "Existing Holder"
who hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement, an "Existing
Holder" and collectively the "Existing Holders"), the undersigned parties listed under New Holders on the signature page hereto
(each such party, together with any person or entity deemed an "New Holder" who hereafter becomes a party to this Agreement pursuant to  Section 5.2 of this Agreement, a "New Holder" and collectively, the "New
Holders"). 

 
 

  RECITALS    
    

        WHEREAS, on October 10, 2016 (the "Original Execution
Date"), the Company and the Existing Holders entered into that certain Registration Rights Agreement (the "Existing Registration Rights
Agreement"), pursuant to which the Company granted the Existing Holders certain registration rights with respect to certain securities of the Company; 

        WHEREAS, the Company has entered into that certain Transaction Agreement (the "Transaction
Agreement"), dated as of August 21, 2017, by and among Envigo International Holdings, Inc., Avista Healthcare Merger Sub, Inc., Avista Healthcare
NewCo, LLC and Jermyn Street Associates, LLC, solely in its capacity as Shareholder Representative (as defined therein); 

        WHEREAS, upon the closing of the transactions contemplated by the Transaction Agreement and subject to the terms and conditions set forth
therein, (a) the New Holders will hold shares of Class A common stock, par value $0.0001, of the Company ("Class A Common Stock")
and warrants to purchase shares of Class A Common Stock ("New Holder Warrants") and (b) the Existing Holders will hold shares of
Class B common stock, par value $0.0001, of the Company ("Class B Common Stock") and warrants to purchase shares of Class A Common
Stock (the "Private Placement Warrants"), in each case, in such amounts and subject to such terms and conditions as set forth in the Transaction
Agreement; 

        WHEREAS, pursuant to Section 5.5 of the Existing Registration Rights Agreement, the
provisions, covenants and conditions set forth therein may be amended or modified upon the written consent of the Company and the Existing Holders of a majority-in-interest of the "Registrable
Securities" (as such term was defined in the Existing Registration Rights Agreement) at the time in question; and 

        WHEREAS, the Company and all of the Existing Holders desire to amend and restate the Existing Registration Rights Agreement in order to
provide the Existing Holders and the New Holders certain registration rights with respect to certain securities of the Company, as set forth in this Agreement. 

        NOW, THEREFORE, in consideration of the representations, covenants and agreements contained herein, and certain other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, hereby agree as follows: 

 
 

  ARTICLE I
  DEFINITIONS    
    

 
 
        1.1    Definitions.     The terms defined in this Article I
shall, for all purposes of this Agreement, have the respective meanings
set forth below: 

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        "Adverse Disclosure" shall mean any public disclosure of material non-public information, which disclosure, in the good faith judgment of
the Chief Executive Officer or principal financial officer of the Company, after consultation with 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. 

        "Affiliate" shall mean, with respect to any Person, any other Person who, directly or indirectly, controls, is controlled by, or is under
direct or indirect common control with, such Person. For the purposes of this definition "control," when used with respect to any specified Person, shall mean the power to direct or cause the
direction of the management and policies of such Person, directly or indirectly, whether through ownership of voting securities or partnership or other ownership interests, by contract or otherwise;
and the terms "controlling" and "controlled" shall have correlative meanings. 

        "Agreement" shall have the meaning given in the Preamble. 

        "Blackout Period" shall have the meaning given in Section 3.4. 

        "Board" shall mean the Board of Directors of the Company. 

        "Class A Common Stock" shall have the meaning given in the Recitals hereto. 

        "Class B Common Stock" shall have the meaning given in the Recitals hereto. 

        "Commission" shall mean the Securities and Exchange Commission. 

        "Company" shall have the meaning given in the Preamble. 

        "Demand Registration" shall have the meaning given in subsection 2.1.1. 

        "Demanding Holder" means, as applicable, the Holders making a written demand for the Registration of Registrable Securities pursuant to  subsection 2.1.1.

        "Exchange Act" shall mean the Securities Exchange Act of 1934, as it may be amended from time to time. 

        "Existing Holders" shall have the meaning given in the Preamble. 

        "Existing Registration Rights Agreement" shall have the meaning given in the Recitals hereto. 

        "Family Group" shall mean, with respect to any Person, such Person, such Person's spouse, such Person's or his/her spouse's mother,
father, descendants, sisters, brothers, aunts, uncles, first cousin, spouses of such Person's descendants, sisters, brothers, aunts, uncles, first cousin and any trust, foundation or other legal
entity controlled by such Person or any of such Person's spouse or descendants, sisters, brothers, aunts, uncles, first cousin, and estate planning (or similar) vehicles for the benefit of any of the
foregoing Persons. Family Group members include Persons who are such by birth or adoption. 

        "Form S-1" shall have the meaning given in subsection 2.1.1. 

        "Form S-3" shall have the meaning given in Section 2.3. 

        "Founder Lock-up Period" shall mean, with respect to the Founder Stock held by the Existing Holders or their Permitted Transferees, the
period ending on the earlier of (a) one year after the 

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date
hereof, (b) the first date the closing price of the Class A Common Stock equals or exceeds $12.00 per share (as adjusted for share splits, stock dividends, reorganizations,
recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the date hereof and (c) the date on which the Company
completes a liquidation, merger, stock exchange, reorganization or other similar transaction which results in all of the Company's stockholders having the right to exchange their Class A Common
Stock for cash, securities or other property. 

        "Founder Stock" shall mean all shares of Class B Common Stock that are issued and outstanding as of the date hereof and all shares
of Class A Common Stock issued upon conversion thereof. 

        "Holders" means the Existing Holders, the New Holders and any person or entity who hereafter becomes a party to this Agreement pursuant to  Section 5.2.

        "Maximum Number of Securities" shall have the meaning given in subsection 2.1.4. 

        "Misstatement" shall mean 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 case of a Prospectus in the light of the circumstances under which they were
made) not misleading. 

        "New Holders" shall have the meaning given in the Preamble. 

        "New Holder Lock-Up Period" shall mean, with respect to the Restricted Shares that are held by the New Holders (other than the Savanna New
Holder or its Permitted Transferees) or their Permitted Transferees, the period ending six months after the date hereof. 

        "Original Execution Date" shall have the meaning given in the Recitals hereto. 

        "Permitted Transferees" shall mean a person or entity to whom a Holder of Registrable Securities is permitted to transfer such Registrable
Securities prior to the expiration of the Founder Lock-up Period, Private Placement Lock-up Period, New Holder Lock-Up Period, Savanna New Holder Three-Month Lock-Up Period or Savanna New Holder
Six-Month Lock-Up Period, as applicable, in accordance with this Agreement and any other agreement between the Company and such Holder. 

        "Piggyback Registration" shall have the meaning given in subsection 2.2.1. 

        "Private Placement Lock-up Period" shall mean, with respect to Private Placement Warrants that are held by the initial purchasers of such
Private Placement Warrants or their Permitted Transferees, and any of the shares of Class A Common Stock issued or issuable upon the exercise or conversion of the Private Placement Warrants and
that are held by the initial purchasers of the Private Placement Warrants or their Permitted Transferees, the period ending 30 days after the date hereof. 

        "Private Placement Warrants" shall have the meaning given in the Recitals hereto. 

        "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 Security" shall mean (a) the shares of Class A Common Stock issued upon the conversion of Class B Common
Stock, (b) the Private Placement Warrants (including any shares of Class A Common Stock issued or issuable upon the exercise of any such Private Placement Warrants), (c) any
outstanding shares of Class A Common Stock or any other equity security (including the shares of Class A common Stock issued or issuable upon the exercise of any other 

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equity
security) held by an Existing Holder as of the date of this Agreement, (d) any equity securities (including the shares of Class A Common Stock issued or issuable upon the exercise
of any such equity security) of the Company issuable upon conversion of any working capital loans in an amount up to $1,500,000 made to the Company by an Existing Holder, (e) any outstanding
shares of Class A Common Stock or any other equity security (including the shares of Class A common Stock issued or issuable upon the exercise of any other equity security) held by a New
Holder as of the date of this Agreement, (g) the New Holder Warrants (including any shares of Class A Common Stock issued or issuable upon the exercise of any such New Holder Warrants)
and (h) any other equity security of the Company issued or issuable with respect to any shares of Class A Common Stock described in the foregoing clauses (a) through (g) by
way of a stock dividend or stock split or in connection with a combination of shares, recapitalization, merger, consolidation or reorganization;  provided, however, that, as to any particular Registrable Security, such securities shall cease to be
Registrable Securities when: (A) a Registration Statement with respect to the sale of such securities shall have become effective under the Securities Act and such securities shall have been
sold, transferred, disposed of or exchanged in accordance with such Registration Statement; (B) such securities shall have been otherwise transferred, new certificates for such securities not
bearing a legend restricting further transfer shall have been delivered by the Company and subsequent public distribution of such securities shall not require registration under the Securities Act;
(C) such securities shall have ceased to be outstanding; (D) except with respect to Registrable Securities held by the Savanna New Holder, such securities may be sold without
registration pursuant to Rule 144 promulgated under the Securities Act (or any successor rule promulgated by the Commission) (but with no volume or other restrictions or limitations); or
(E) such securities have been sold to, or through, a broker, dealer or underwriter in a public distribution or other public securities transaction. 

        "Registration" shall mean 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" shall mean the out-of-pocket expenses of a Registration, including, without limitation, the following: 

        (A)  all
registration, listing and filing fees (including fees with respect to filings required to be made with the Financial Industry Regulatory Authority, Inc.) and
any securities exchange on which the shares of Class A Common Stock are 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); 

        (C)  printing,
messenger, telephone and delivery expenses (including the cost of distributing prospectuses in preliminary and final form as well as any supplements thereto); 

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

        (E)  reasonable
fees and disbursements of all independent registered public accountants of the Company (including any fees and expenses arising from any special audits or
"comfort letters") and any other Persons retained by the Company in connection with or incident to any registration of Registrable Securities pursuant to this Agreement; 

        (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; 

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        (G)  all
transfer agent's and registrar's fees; 

        (H)  customary
fees and expenses incurred in connection with any "road show" for underwritten offerings; and 

        (I)   customary
fees and expenses of underwriters (other than Selling Expenses) customarily paid by the issuers of securities. 

        "Registration Statement" shall mean any registration statement that covers the Registrable Securities pursuant to the provisions of this
Agreement, including the Prospectus included in such registration statement, amendments (including post-effective amendments) and supplements to such registration statement, and all exhibits to and
all material incorporated by reference in such registration statement. 

        "Restricted Shares" shall have the meaning given in Section 3.6. 

        "Requesting Holder" shall have the meaning given in subsection 2.1.1. 

        "Savanna New Holder" shall mean those certain New Holders designated as a "Savannah New Holder" on the signature page hereto. 

        "Savanna New Holder Six-Month Lock-Up Period" shall mean, with respect to the Savanna New Holder Six-Month Restricted Shares, the period
ending six months after the date hereof. 

        "Savanna New Holder Six-Month Restricted Shares" shall mean 25% of the Restricted Shares that are held by the Savanna New Holder or its
Permitted Transferees as of the date hereof. 

        "Savanna New Holder Three- Month Lock-Up Period" shall mean, with respect to the Savanna New Holder Three-Month Restricted Shares, the
period ending three months after the date hereof. 

        "Savanna New Holder Three- Month Restricted Shares" shall mean 75% of the Restricted Shares that are held by the Savanna New Holder or its
Permitted Transferees as of the date hereof. 

        "Securities Act" shall mean the Securities Act of 1933, as amended from time to time. 

        "Sponsor" shall have the meaning given in the Recitals hereto. 

        "Suspension Period" shall have the meaning given in Section 3.4. 

        "Transfer" shall have the meaning given in Section 3.6. 

        "Underwriter" shall mean 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. 

        "Underwritten Offering" shall mean 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
  REGISTRATIONS    
    

 
 
        2.1    Demand Registration.
    

        2.1.1    Request for Registration.    Subject to the provisions of  subsection 2.1.4 and Section 2.4 hereof, (a) the Existing Holders of at least a
majority-in-interest of then then-outstanding number of Registrable Securities held by the Existing Holders, (b) the New Holders of at least a majority-in-interest of the then-outstanding
number of Registrable Securities held by the New Holders, or (c) the Savanna New Holder, (the "Demanding Holders"), in each case, may make a
written demand for Registration of all or a part of their Registrable Securities, which written demand shall describe the amount and type of securities to be included in such Registration and 

E-5

 

the
intended method(s) of distribution thereof (such written demand a "Demand Registration"); provided
that no Holder (other than the Savanna New Holder) may make a Demand Registration during the period starting on the date hereof and ending on the date six months after the date hereof (the
"Savanna New Holder Exclusivity Period"). 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 a Registration pursuant to a 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;  provided, that during the Savanna
New Holder Exclusivity Period, no Holder other than the Savanna New Holder shall have the right to include any portion
of such Holder's Registrable Securities in a Registration. 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 forty five (45) days immediately after the Company's receipt of the Demand 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 (x) an aggregate of three (3) Registrations
pursuant to a Demand Registration by the Existing Holders under this subsection 2.1.1 with respect to any or all Registrable Securities held by
such Existing Holders and (y) an aggregate of three (3) Registrations pursuant to a Demand Registration by the New Holders under this  subsection 2.1.1 with respect to any or all
Registrable Securities held by such New Holders;  provided, however, that a Registration shall not be counted for such purposes unless a Form S-1
or any similar long-form registration statement that may be available at such time ("Form S-1") has become effective and all of the Registrable
Securities requested by the Demanding Holders and the Requesting Holders to be registered on behalf of the Demanding Holders and the Requesting Holders in such Form S-1 Registration have been
sold, in accordance with Section 3.1. Notwithstanding the foregoing, the Company shall not be required to give effect to a Demand Registration
from a Demanding Holder if the Company has registered Registrable Securities pursuant to a Demand Registration from such Demanding Holder (except if such Demanding Holder is the Savanna New Holder) in
the preceding one-hundred and fifty (150) days. 

        2.1.2    Effective Registration.    Notwithstanding the provisions of  subsection 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) the Registration Statement filed with the Commission with respect to a Registration pursuant to a Demand 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,  further, that if, after such
Registration Statement has been declared effective, an offering of Registrable Securities in a Registration pursuant to a
Demand Registration is subsequently interfered with by any stop order or injunction of the Commission, federal or state court or any other governmental agency the Registration Statement with respect
to such Registration shall 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, but
in no event later than five (5) days, of such election; provided, further, that the Company shall
not be obligated or required to file another Registration Statement until the Registration Statement that has been previously filed with respect to a Registration pursuant to a Demand Registration
becomes effective or is subsequently terminated. 

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        2.1.3    Underwritten Offering.    Subject to the provisions of  subsection 2.1.5 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 the Registrable Securities pursuant to such Demand Registration 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 subsection 2.1.3 shall enter into an underwriting agreement
in customary form with the Underwriter(s) selected for such Underwritten Offering by the majority-in-interest of the Demanding Holders initiating the Demand Registration. 

        2.1.4    Reduction of Underwritten Offering.    If the managing Underwriter or Underwriters in an Underwritten
Offering pursuant to a Demand Registration, in good faith, advises the Company, the Demanding Holders and the Requesting Holders (if any) in writing that the dollar amount or number of Registrable
Securities that the Demanding Holders and the Requesting Holders (if any) desire to sell, taken together with all other shares of Class A Common Stock or other equity securities that the
Company desires to sell and the shares of Class A Common Stock, if any, as to which a Registration has been requested pursuant to separate written contractual piggy-back registration rights
held by any other stockholders who desire to sell, exceeds the maximum dollar amount or maximum number of equity securities that can be sold in such Underwritten Offering without adversely affecting
the proposed offering price, the timing, the distribution method, or the probability of success of such offering (such maximum dollar amount or maximum number of such 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, if the Demanding Holders are Existing Holders, the Requesting Holders that are Existing Holders (if any) or, if the Demanding Holders are New Holders, the Requesting
Holders that are New Holders (if any) (in each case 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 Offering and the aggregate number of Registrable Securities that the Demanding Holders and Requesting Holders have requested be included in such Underwritten Offering
(such proportion is referred to herein as "Pro Rata")) that can be sold without exceeding the Maximum Number of Securities;  provided, that until
such time as the Savanna New Holder no longer holds any Registrable Securities, the pro rata allocation of Registrable Securities
shall be adjusted so that the Registrable Securities to be allocated to the Savanna New Holder (if the Savanna New Holder is a Demanding Holder or Requesting Holder) pursuant to this clause (i)
shall include the maximum number of Registrable Securities that the Savanna New Holder has requested to be included in such Underwritten Offering, (ii) second, to the extent that the Maximum
Number of Securities has not been reached under the foregoing clause (i), the Registrable Securities of any other Holders (pro rata, based on the respective numbers of Registrable Securities
that each Holder has so requested exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1 hereof) without
exceeding the Maximum Number of Securities; and (iii) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (i) and (ii), the shares
of Class A Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (iv) fourth, to the extent
that the Maximum Number of Securities has not been reached under the foregoing clauses (i), (ii) and (iii), the shares of Class A 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. 

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        2.1.5    Demand Registration Withdrawal.    Any of the Demanding Holders initiating a Demand Registration or any of
the Requesting Holders (if any), pursuant to a Registration under subsection 2.1.1 shall have the right to withdraw from a Registration pursuant
to such Demand Registration pursuant to subsection 2.1.1 for any or no reason whatsoever upon written notification to the Company and the
Underwriter or Underwriters (if any) of their intention to withdraw from such Registration prior to (x) in the case of a Demand Registration not involving any Underwritten Offering, the
effectiveness of the applicable Registration Statement or (y) in the case of any Demand Registration involving an Underwritten Offering, prior to the pricing of such Underwritten
Offering; provided, however, that upon withdrawal by a majority-in-interest of the Demanding Holders initiating a Demand Registration, the Company shall
cease all efforts to secure effectiveness of the applicable Registration Statement or complete the Underwritten Offering, as applicable. Notwithstanding anything to the contrary in this Agreement, 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 subsection 2.1.5.

 
 

          2.2    Piggyback Registration.
    

        2.2.1    Piggyback Rights.    If 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, for its own account or for the account of
stockholders of the Company (or by the Company and by the stockholders of the Company including, without limitation, pursuant to Section 2.1
hereof), 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 or (iv) for a dividend reinvestment plan, then the Company
shall give written notice of such proposed filing to all of the Holders of Registrable Securities as soon as practicable but not less than ten (10) days before the anticipated filing date of
such Registration Statement, which notice shall (A) 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, in such offering, and (B) offer to all of the Holders of Registrable Securities the opportunity to register the sale of such number of
Registrable Securities as such Holders may request in writing within five (5) days after receipt of such written notice (such Registration a "Piggyback
Registration"). The Company shall, in good faith, cause such Registrable Securities to be included in such Piggyback Registration and shall use its best efforts to cause the
managing Underwriter or Underwriters of a proposed Underwritten Offering to permit the Registrable Securities requested by the Holders pursuant to this  subsection 2.2.1 to be included in a
Piggyback Registration on the same terms and conditions as any similar securities of the Company included in
such Registration and to permit the sale or other disposition of such Registrable Securities in accordance with the intended method(s) of distribution thereof. All such Holders proposing to distribute
their Registrable Securities through an Underwritten Offering under this subsection 2.2.1 shall enter into an underwriting agreement in customary
form with the Underwriter(s) selected for such Underwritten Offering by the Company. 

        2.2.2    Reduction of Piggyback Registration.    If the managing Underwriter or Underwriters in an Underwritten
Offering that is to be a Piggyback Registration, 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 the shares of Class A Common Stock that the Company desires to sell, taken together with (i) the shares of Class A Common Stock, 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 pursuant Section 2.2 hereof, and (iii) the shares of Class A Common Stock, if any, as to which
Registration has been requested pursuant to 

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separate
written contractual piggy-back registration rights of other stockholders of the Company, exceeds the Maximum Number of Securities, then: 

        (a)   If
the Registration is undertaken for the Company's account, the Company shall include in any such Registration (i) first, the shares of Class A Common
Stock or other equity securities that the Company desires to sell, which 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 exercising their rights to register their Registrable Securities pursuant to  subsection 2.2.1 hereof, pro rata, based on the respective number of Registrable Securities that each Holder has requested to be included in such
Piggyback Registration and the aggregate number of Registrable Securities that the Holders have requested be included in such Piggyback Registration, which can be sold without exceeding the Maximum
Number of Securities; provided, that until such time as the Savanna New Holder no longer holds any Registrable Securities, the pro rata allocation of
Registrable Securities shall be adjusted so that the Registrable Securities to be allocated to the Savanna New Holder (if the Savanna New Holder has elected to participate in the Piggyback
Registration) pursuant to this clause (ii) shall include the maximum number of Registrable Securities that the Savanna New Holder has requested to be included in such Piggyback Registration,
and (iii) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (i) and (ii), the shares of Class A Common Stock, if any, as
to which Registration has been requested pursuant to written contractual piggy-back registration rights of other stockholders of the Company, which can be sold without exceeding the Maximum Number of
Securities; 

        (b)   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 (i) first, the shares of Class A 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; (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 exercising their rights to register their Registrable Securities pursuant to  subsection 2.2.1, pro rata, based on the respective number of
Registrable Securities that each Holder has so requested to be registered, which
can be sold without exceeding the Maximum Number of Securities; provided, that until such time as the Savanna New Holder no longer holds any Registrable
Securities, the pro rata allocation of Registrable Securities shall be adjusted so that the Registrable Securities to be allocated to the Savanna New Holder (if the
Savanna New Holder has elected to participate in the Piggyback Registration) pursuant to this clause (ii) shall include the maximum number of Registrable Securities that the Savanna New Holder
has requested to be included in such Piggyback Registration, third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (i) and (ii), the shares
of Class A Common Stock or other equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (iv) fourth, to the extent
that the Maximum Number of Securities has not been reached under the foregoing clauses (i), (ii) and (iii), the shares of Class A 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. 

        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 or Underwriters (if any) of his, her or its intention to withdraw from such
Piggyback Registration prior to (x) in the case of a Piggyback 

E-9

 

Registration
not involving an Underwritten Offering, prior to the effectiveness of the Registration Statement filed with the Commission with respect to such Piggyback Registration or (y) in the
case of any Piggyback Registration involving an Underwritten Offering, prior to the pricing of such Underwritten Offering. 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 subsection 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  subsection 2.1.1 hereof. 

 
 

           2.3    Registrations on Form S-3.     The Holders of Registrable Securities may at any time, and from
time to time, request in writing that the Company, pursuant to Rule 415 under the
Securities Act (or any successor rule promulgated thereafter by the Commission), register the resale of any or all of their Registrable Securities on Form S-3 or any similar short-form
registration statement that may be available at such time ("Form S-3"). Within five (5) days of the Company's receipt of a written request
from a Holder or Holders of Registrable Securities for a Registration on Form S-3, the Company shall promptly give written notice of the proposed Registration on Form S-3 to all other
Holders of Registrable Securities, and each Holder of Registrable Securities who thereafter wishes to include all or a portion of such Holder's Registrable Securities in such Registration on
Form S-3 shall so notify the Company, in writing, within ten (10) days after the receipt by the Holder of the notice from the Company. As soon as practicable thereafter, but not more
than twelve (12) days after the Company's initial receipt of such written request for a Registration on Form S-3, the Company shall register all or such portion of such Holder's
Registrable Securities as are specified in such written request, together with all or such portion of Registrable Securities of any other Holder or Holders joining in such request as are specified in
the written notification given by such Holder or Holders; provided, however, that the Company shall not
be obligated to effect any such Registration pursuant to Section 2.3 hereof if (i) a Form S-3 is not available for such offering;
or (ii) the Holders of Registrable Securities, together with the Holders of any other equity securities of the Company entitled to inclusion in such Registration, propose to sell the
Registrable Securities and such other equity securities (if any) at any aggregate price to the public of less than $5,000,000. 

 
 

           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 subsection 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 Offering and the Company and the Holders are unable to obtain the commitment of
underwriters to firmly underwrite the offer; or (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
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 thirty (30) days;  provided, however, that the Company shall not defer its obligation in this manner more than once in any
12-month period. Notwithstanding anything 

E-10

 

to
the contrary contained in this Agreement, no Registration shall be effected or permitted and no Registration Statement shall become effective, with respect to any Registrable Securities held by any
applicable Holders, until after the expiration of the Founder Lock-up Period, the Private Placement Lock-up Period, the New Holder Lock-Up Period, the Savanna New Holder Three-Month Lock-Up Period or
the Savanna New Holder Six-Month Lock-Up Period, as applicable; provided, however, that this shall not
prevent any Holder from making a Demand Registration or other Registration hereunder prior to the expiration of such lock-up such that such Registration Statement is only effective on or after the
expiration of the Founder Lock-up Period, the Private Placement Lock-up Period, the New Holder Lock-Up Period, the Savanna New Holder Three-Month Lock-Up Period or the Savanna New Holder Six-Month
Lock-Up Period. 

 
 

  ARTICLE III
  COMPANY PROCEDURES    
    

 
 
        3.1    General Procedures.     If the Company is required to effect the Registration of Registrable Securities, the
Company shall use its best efforts to effect such 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 possible: 

        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
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 to 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 one legal counsel for such Holders may request in order to
facilitate the disposition of the Registrable Securities owned by such Holders (and in each case shall consider in good-faith any comments provided by such persons); 

        3.1.4  prior
to any public offering of Registrable Securities, use its 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, however, 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; 

E-11

 

        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 comments by the Commission,
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  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, to the extent practicable, 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 one counsel on behalf of such sellers; 

        3.1.9  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; 

        3.1.10  permit
a representative of the 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 and the underwriters due diligence responsibilities and ;  provided, however, 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; 

        3.1.11  obtain
a "cold comfort" letter from the Company's independent registered public accountants in the event of an Underwritten Offering, in customary form and covering
such matters of the type customarily covered by "cold comfort" letters as the managing Underwriter may reasonably request, and reasonably satisfactory to a majority-in-interest of the participating
Holders; 

        3.1.12  if
such offering is an underwritten offering, use its reasonable best efforts to provide legal opinions of the Company's outside counsel, addressed to the
underwriters, dated the effective date of, or the date of the final receipt issued for, such Registration Statement (the date of the closing under the underwriting agreement for such offering), each
amendment and supplement thereto, with respect to the Registration Statement, each amendment and supplement thereto (including the preliminary prospectus) and such other documents relating thereto in
customary form and covering such matters of the type customarily covered by legal opinions of such nature; 

        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 reasonably satisfactory to a majority-in-interest of the participating Holders; 

E-12

 

        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
Underwriter of such offering and take all such appropriate and reasonable other actions as the Holders or the underwriters, if any, reasonably request in order to expedite or facilitate the
disposition of such Registrable Securities; 

        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 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. 

 
 

           3.2    Registration Expenses.     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 and brokerage fees, and, other than as set forth in the definition of
"Registration Expenses," all reasonable fees and expenses of any legal counsel representing the Holders. 

 
 

           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 (i) agrees to sell such person'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. 

 
 

           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 it 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 supplement or amendment as soon as practicable after the time of such notice), or until it is advised in writing by the Company that the use of the Prospectus may be
resumed (any such period, a "Suspension Period"). If the filing, initial effectiveness or continued use of a (including in connection with any
Underwritten Offering) Registration Statement in respect of any Registration at any time would require the Company to make an Adverse Disclosure or would require the inclusion in such Registration
Statement of financial statements that are unavailable to the Company for reasons beyond the Company's control, 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 (including in connection with any Underwritten Offering), such Registration Statement for the shortest period of time, but in no event more
than thirty (30) days, determined in good faith by the Company to be necessary for such purpose (any such period, a "Blackout Period") and in no
event shall (i) the Company deliver notice of a Blackout Period to the Holders more than two times in any calendar year (or more than once in a six month period) or (ii) Blackout Periods
be in effect for an aggregate of forty-five (45) days or more in any calendar year. 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 

E-13

 

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. 

 
 

           3.5    Reporting Obligations.     As long as any Holder shall own Registrable Securities, the Company, at
all times while it shall be a reporting company 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 delivery of which will be satisfied by the Company's filing of such reports on the
Commission's EDGAR system). 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 shares of Class A Common Stock 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 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. 

 
 

           3.6    Transfer Restrictions.     

        3.6.1  During
the New Holder Lock-Up Period, the Savanna New Holder Three-Month Lock-Up Period or the Savanna New Holder Six-Month Lock-Up Period, as applicable, no New
Holder shall offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of or distribute ("Transfer")
any shares of Class A Common Stock, any New Holder Warrants or shares of Class A Common Stock issued with respect thereto or any other options or warrants to purchase any shares of
Class A Common Stock or any securities convertible into, exercisable for, exchangeable for or that represent the right to receive shares of Class A Common Stock, whether now owned or
hereinafter acquired, that is owned directly by such New Holder (including securities held as a custodian) or with respect to which such New Holder has beneficial ownership within the rules and
regulations of the Commission (collectively, the "Restricted Shares"); provided, that, for the avoidance
of doubt, the foregoing restrictions shall only apply to (i) the Savanna New Holder Three-Month Lock-Up Restricted Shares during the Savanna New Holder Three-Month Lock-Up Period and
(ii) the Savanna New Holder Six-Month Lock-Up Restricted Shares during the Savanna New Holder Six-Month Lock-Up Period. The foregoing restriction is expressly agreed to preclude each New Holder
from engaging in any hedging or other transaction which is designed to or which reasonably could be expected to lead to or result in a sale or disposition of the Restricted Shares even if such
Restricted Shares would be disposed of by someone other than such New Holder. Such prohibited hedging or other transactions include any short sale or any purchase, sale or grant of any right
(including any put or call option) with respect to any of the Restricted Shares of the applicable New Holder or with respect to any security that includes, relates to, or derives any significant part
of its value from such Restricted Shares. 

        3.6.2  Each
New Holder hereby represents and warrants that it now has, and, except as contemplated by this  subsection 3.6.2, for the duration of the New Holder Lock-Up Period, the Savanna New Holder
Three-Month Lock-Up Period or the Savanna New Holder
Six-Month Lock-Up Period, as applicable, will have, good and marketable title to its Restricted Shares, free and clear of all liens, encumbrances, and claims that could impact the ability of such New
Holder to comply with the foregoing restrictions. Each New Holder agrees and consents to the entry of stop transfer instructions with the Company's transfer agent and registrar against the transfer of
any Restricted Shares during the New Holder Lock-Up Period, the Savanna New Holder Three-Month Lock-Up Period or the Savanna New Holder Six-Month Lock-Up Period, as applicable, except in compliance
with the foregoing restrictions. 

E-14

 

        3.6.3  Notwithstanding
anything to the contrary set forth herein, a Holder may Transfer Restricted Shares, Founder Stock or Private Placement Warrants (including shares of
Class A Common Stock issued in exchange thereof) prior to the expiration of the applicable lock-up period to (a) an Affiliate of such Holder or, in the case of a Holder who is a natural
person, such Holder's Family Group, (b) in the case of an entity, to its direct or indirect beneficial owners in accordance with their pro rata ownership
share in such entity, (c) any other Holder or an Affiliate of any other Holder, or (d) such other Peron upon the prior written consent of the Company; provided
that, in each case, it shall be a condition to any such Transfer, that the transferee execute and deliver a joinder to this Agreement in a form reasonably satisfactory to the
Company whereby such transferee shall agree to be bound by the terms of this Agreement and shall thereupon be deemed an Existing Holder or New Holder hereunder, as applicable. 

 
 

  ARTICLE IV
  INDEMNIFICATION AND CONTRIBUTION    
    

 
 
        4.1    Indemnification.     

        4.1.1  The
Company agrees to indemnify, to the extent permitted by law, each Holder of Registrable Securities, their affiliates and their respective officers, directors,
employees and partners and each person who is a "controlling person" such Holder (within the meaning of the Securities Act) against, and pay and reimburse such persons for all losses, claims, damages,
liabilities and expenses (including 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 thereof or supplement thereto or any omission or alleged omission of a material fact required to be stated therein or necessary to make the statements therein not misleading, except
insofar as the same are caused by or contained in any information furnished in writing to the Company by such Holder expressly for use therein and the Company will pay and reimburse any Holder and
each such affiliate, director, officer, employee, partner and controlling person for any legal or any other expenses actually and reasonably incurred by them in connection with investigating,
defending or settling any such loss, claim, liability, action or proceeding. The Company shall indemnify the Underwriters, their officers and 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 the indemnification of the Holder or as is reasonable and customary in an underwritten
offering. 

        4.1.2  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,  however, 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. The Holders of Registrable Securities shall indemnify the Underwriters, their officers, directors and each person who controls such Underwriters (within the meaning of 

E-15

 

the
Securities Act) to the same extent as provided in the foregoing with respect to indemnification of the Company. 

        4.1.3  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 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 unless (i) such settlement is to 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) (ii) such settlement includes 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 and (iii) such settlement does not include an admission
of fault by such indemnified party. 

        4.1.4  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. 

        4.1.5  If
the indemnification provided under Section 4.1 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, however,
that the liability of any Holder under this subsection 4.1.5 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 subsections 4.1.1, 4.1.2 and 4.1.3
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 subsection 4.1.5 were 

E-16

 

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  subsection 4.1.5. 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 subsection 4.1.5 from any person who was not guilty of such fraudulent misrepresentation. 

 
 

  ARTICLE V
  MISCELLANEOUS    
    

 
 
        5.1    Notices.     Any notice or communication under this Agreement must be in writing and given by
(i) deposit in the United States mail, addressed to the party to be
notified, postage prepaid and registered or certified with return receipt requested, (ii) delivery in person or by courier service providing evidence of delivery, or (iii) transmission
by hand delivery, electronic mail, telecopy, telegram or facsimile. Each notice or communication that is mailed, delivered, or transmitted in the manner described above shall be deemed sufficiently
given, served, sent, and received, in the case of mailed notices, on the third business day following the date on which it is mailed and, in the case of notices delivered by courier service, hand
delivery, electronic mail, telecopy, telegram or facsimile, at such time as it is delivered to the addressee (with the delivery receipt or the affidavit of messenger) or at such time as delivery is
refused by the addressee upon presentation. Any notice or communication under this Agreement must be addressed, if to the Company to: 65 East 55th St., 18th Floor, New York, NY 10022 or
by facsimile at (212) 593-6901, and, if to any Holder, at such Holder's address or facsimile number as set forth in the Company's books and records. Any party may change its address for notice
at any time and from time to time by written notice to the other parties hereto, and such change of address shall become effective thirty (30) days after delivery of such notice as provided in
this Section 5.1. 

 
 

           5.2    Assignment; No Third Party Beneficiaries.     

        5.2.1  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. 

        5.2.2  Prior
to the expiration of the Founder Lock-up Period, the Private Placement Lock-up Period, the New Holder Lock-Up Period, the Savanna New Holder Three-Month Lock-Up
Period or the Savanna New Holder Six-Month Lock-Up Period, as the case may be, no Holder may assign or delegate such Holder's rights, duties or obligations under this Agreement, in whole or in part,
in violation of the applicable lock-up period, except in connection with a transfer of Registrable Securities by such Holder to another Holder or a Permitted Transferee but only if such Permitted
Transferee agrees to become bound by the transfer restrictions set forth in this Agreement. 

        5.2.3  This
Agreement and the provisions hereof shall be binding upon and shall inure to the benefit of each of the parties and its successors and the permitted assigns of
the Holders, which shall include Permitted Transferees. 

        5.2.4  This
Agreement shall not confer any rights or benefits on any persons that are not parties hereto, other than as expressly set forth in this Agreement and  Section 5.2 hereof. 

        5.2.5  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 as provided in Section 5.1 hereof 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). Any transfer or assignment made other than as provided in this Section 5.2 shall be null and void. 

E-17

 

 
 

           5.3    Counterparts.     This Agreement may be executed in multiple counterparts (including facsimile or PDF
counterparts), each of which shall be deemed an original, and all of which
together shall constitute the same instrument, but only one of which need be produced. 

 
 

           5.4    Governing Law; Venue.     NOTWITHSTANDING THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF
THE PARTIES HERETO, THE PARTIES EXPRESSLY AGREE THAT THIS AGREEMENT SHALL BE GOVERNED BY
AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK AS APPLIED TO AGREEMENTS AMONG NEW YORK RESIDENTS ENTERED INTO AND TO BE PERFORMED ENTIRELY WITHIN NEW YORK, WITHOUT REGARD TO THE CONFLICT OF LAW
PROVISIONS OF SUCH JURISDICTION. ANY LEGAL SUIT, ACTION OR PROCEEDING ARISING OUT OF OR BASED UPON THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY MAY BE INSTITUTED IN THE FEDERAL COURTS OF THE
UNITED STATES OR THE COURTS OF THE STATE OF NEW YORK IN EACH CASE LOCATED IN THE CITY OF NEW YORK, AND EACH PARTY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF SUCH COURTS IN ANY SUCH SUIT,
ACTION OR PROCEEDING. 

 
 

           5.5    Amendments and Modifications.     Upon the written consent of (i) the Company and
(ii) Holders of at least a majority-in-interest of the Registrable Securities held by the Holders at
the time in question at the time in question, compliance with any of the provisions, covenants and conditions set forth in this Agreement may be waived, or any of such provisions, covenants or
conditions may be amended or modified; provided, however, that notwithstanding the foregoing, any
amendment hereto or waiver hereof that adversely affects either the Existing Holders as a group, the New Holders as group or the Savanna New Holder with respect to rights or obligations specific to
the Savanna New Holder, respectively, in a manner that is materially adversely different from Existing Holders, New Holders or Savanna New Holder, as applicable shall require the consent of at least a
majority-in-interest of the Registrable Securities held by such Existing Holders, a majority-in-interest of the Registerable Securities held by such New Holders or the Savanna New Holder, as
applicable, at the time in question so affected, provided, further, that notwithstanding the foregoing,
any amendment hereto or waiver hereof that adversely affects one Holder, solely in 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. No course of dealing between any Holder or the Company and any other party hereto or any failure or delay on
the part of a Holder or the Company in exercising any rights or remedies under this Agreement shall operate as a waiver of any rights or remedies of any Holder or the Company. No single or partial
exercise of any rights or remedies under this Agreement by a party shall operate as a waiver or preclude the exercise of any other rights or remedies hereunder or thereunder by such party. 

 
 

           5.6    Other Registration Rights.     The Company represents and warrants that no person, other than a
Holder of Registrable Securities, has any right to require the Company to register any securities
of the Company for sale or to include such securities of the Company in any Registration filed by the Company for the sale of securities for its own account or for the account of any other person.
Further, the Company represents and warrants that this Agreement supersedes any other registration rights agreement or agreement with similar terms and conditions and in the event of a conflict
between any such agreement or agreements and this Agreement, the terms of this Agreement shall prevail. The Company agrees that it will not enter into, any agreement with respect to its securities
that violates or subordinates or is otherwise inconsistent with the rights granted to the Holders of Registrable Securities under this Agreement without the written consent of a majority-in-interest
of the Registrable Securities held by the Holders at the time in question. For the term of this Agreement, the Company shall not grant to any Person the right to require the Company to register any
equity securities of the Company, or any securities convertible or exchangeable into or exercisable for such securities, without written 

E-18

 

consent
of the majority-in-interest of the Holders, unless such rights are explicitly made subordinate to all rights granted hereunder. 

 
 

           5.7    Term.     This Agreement shall terminate upon the earlier of (i) the tenth anniversary of the
date of this Agreement or (ii) the date as of which
(A) all of the Registrable Securities have been sold pursuant to a Registration Statement (but in no event prior to the applicable period referred to in Section 4(a)(3) of the Securities
Act and Rule 174 thereunder) or (B) the Holders of all Registrable Securities are permitted to sell the Registrable Securities under Rule 144 (or any similar provision) under the
Securities Act without limitation on the amount of securities sold or the manner of sale. The provisions of Section 3.5 and  Article IV shall
survive any termination. 

 
 

          5.8    Interpretation.     The words "include,"
"includes" and
"including" when used herein shall be deemed in each case to be followed by the words "without
limitation." The word "herein" and similar references mean, except where a specific Section or Article reference is expressly
indicated, the entire Agreement rather than any specific Section or Article. The table of contents and the headings contained in this Agreement are for reference purposes only and shall not affect in
any way the meaning or interpretation of this Agreement. Unless expressly indicated otherwise in this Agreement, all references in this Agreement to "the date
hereof" or "the date of this Agreement" shall refer to
[    ·    ] and shall not be deemed to refer to the Original Execution Date. 

 
 

           5.9    Listing.     The Company agrees to use commercially reasonable efforts to cause the Class A
Common Stock to continue to be listed on the NASDAQ Stock Market or another
national securities exchange 

[Signature Page Follows] 

E-19

        IN WITNESS WHEREOF, the undersigned have caused this Agreement to be executed as of the date first written above. 

 

 
 

							
	 	 	 COMPANY:
	

 	
 	
 AVISTA HEALTHCARE PUBLIC

ACQUISITION CORP
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	 
	 	 	 	 	Title:	 	 
	

 	
 	
 EXISTING HOLDERS:
	

 	
 	
 AVISTA ACQUISITION CORP
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	 
	 	 	 	 	Title:	 	 
	

 	
 	
 HÅKAN BJÖRKLUND:
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	Håkan Björklund
	

 	
 	
 CHARLES HARWOOD
	

 	
 	
By:	
 	
 

 
	 	 	 	 	Name:	 	Charles Harwood
	

 	
 	
 BRIAN MARKISON
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	Brian Markison
	

 	
 	
 ROBERT O'NEIL
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	Robert O'Neil

 

 [Signature Page to Registration Rights Agreement]

 

 
 

							
	 	 	 NEW HOLDERS:
	

 	
 	
 [NEW HOLDER]
	

 	
 	
By:	
 	
  

 
	 	 	 	 	Name:	 	 
	 	 	 	 	Title:	 	 

 

 

QuickLinks

FORM OF AGREEMENT

AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

RECITALS

ARTICLE I DEFINITIONS

1.1 Definitions.

ARTICLE II REGISTRATIONS

2.1 Demand Registration .

2.2 Piggyback Registration .

2.3 Registrations on Form S-3.

2.4 Restrictions on Registration Rights.

ARTICLE III COMPANY PROCEDURES

3.1 General Procedures.

3.2 Registration Expenses.

3.3 Requirements for Participation in Underwritten Offerings.

3.4 Suspension of Sales; Adverse Disclosure.

3.5 Reporting Obligations.

3.6 Transfer Restrictions.

ARTICLE IV INDEMNIFICATION AND CONTRIBUTION

4.1 Indemnification.

ARTICLE V MISCELLANEOUS

5.1 Notices.

5.2 Assignment; No Third Party Beneficiaries.

5.3 Counterparts.

5.4 Governing Law; Venue.

5.5 Amendments and Modifications.

5.6 Other Registration Rights.

5.7 Term.

5.8 Interpretation.

5.9 Listing.Annex F  

February 9,
2018 

Avista
Healthcare Public Acquisition Corp.

65 East 55th Street

18th Floor

New York, NY 10022 

        RE:
Surrender of Class B Shares and Private Placement Warrants 

        Reference
is made to the letter agreement dated as of August 21, 2017, as amended and restated on January 21, 2018 (the "Letter
Agreement"), entered into and delivered by Parent, Avista Acquisition Corp., a Cayman Islands exempt company ("Parent Sponsor"),
and certain directors of Parent that are
signatories hereto (collectively with the Parent Sponsor, the "Class B Holders") in connection with the transactions contemplated by the
Transaction Agreement dated as of August 21, 2017, by and among Envigo International Holdings, Inc., a Delaware corporation, Avista Healthcare Public Acquisition Corp., a Cayman Islands
exempted company ("Parent"), Avista Healthcare Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of Parent, Avista Healthcare
NewCo, LLC, a Delaware limited liability company and wholly-owned subsidiary of Parent, and Jermyn Street Associates LLC, solely in its capacity as Shareholder Representative, as amended
on November 22, 2017, as further amended on December 22, 2017 and as further amended on January 21, 2018 (the "Transaction
Agreement"). This letter (the "Restated Letter") is being entered into and delivered by Parent, Parent Sponsor and the
Class B Holders in connection with the transactions contemplated by the Transaction Agreement and serves to amend and restate the Letter Agreement. Capitalized terms used but not otherwise
defined herein shall have the meanings ascribed to such terms in the Transaction Agreement. 

        In
consideration of the amendment of the Transaction Agreement of even date herewith and for other good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, each of the Class B Holders hereby (a) represents and warrants that the Class B Holders collectively hold all of the issued and outstanding Private Placement
Warrants and Class B Shares, in each case, as of the date of this Restated Letter; (b) agrees that, subject to the satisfaction or waiver of each of the conditions to Closing set forth
in Sections 6.1 and 6.2 of the Transaction Agreement, and immediately prior to the Domestication, the Class B Holders shall collectively (pro rata among the Class B Holders)
(i) surrender 4,715,576 Class B Shares to Parent for no consideration and (ii) surrender 4,100,000 Private Placement Warrants to Parent for no consideration; (c) agrees
that, until the consummation of the transactions contemplated by the Transaction Agreement, the Class B Holders shall not modify, amend or terminate that certain Letter Agreement, dated
October 10, 2016, by and among Parent and the Class B Holders, waive or release any claims or rights thereunder or otherwise consent to any of the foregoing; and (d) waives any
and all rights such Class B Holder has or will have under the Parent Organizational Documents to receive, with respect to each share of Class B common stock of Parent, par value $0.0001,
held by such Class B Holder immediately following the Domestication, more than one share of Parent Common Stock upon conversion thereof in accordance with the Parent Organizational Documents.
Subject to the terms and conditions of this Restated Letter, the Class B Holders agree to take, or cause to be taken, all actions and to do, or cause to be done, all things necessary, proper or
advisable to consummate and make effective the transactions contemplated by this Restated Letter. 

        This
Restated Letter shall terminate, and have no further force and effect, if the Transaction Agreement is terminated in accordance with its terms prior to the First Merger Effective
Time. This Restated Letter, and any claim or cause of action hereunder based upon, arising out of or related to this Restated Letter (whether based on law, in equity, in contract, in tort or any other
theory) or the negotiation, execution, performance or enforcement of this Restated Letter, shall be governed by and 

F-1

 

construed
in accordance with the Laws of the State of New York, without giving effect to any principles of conflicts of law. This Restated Letter may be executed in two (2) or more counterparts
(including by electronic means), all of which shall be considered one and the same agreement and shall become
effective when signed by each of the parties and delivered to the other party, it being understood that both parties need not sign the same counterpart. 

        [The remainder of this page left intentionally blank.]

F-2

 

        Please
indicate your agreement to the terms of this Restated Letter by signing where indicated below. 

 

 
 

					
	 	 	 Very truly yours,
	

 	
 	
 Avista Acquisition Corp.
	

 	
 	
 By:	
 	
/s/ DAVID BURGSTAHLER  
	 	 	 	 	

  
	 	 	Name:	 	David Burgstahler
	 	 	Title:	 	President and Chief Executive Officer
	

 	
 	
Solely in their capacity as a holder of Class B Shares and Private Placement Warrants:
	

 	
 	
/s/ HÅKAN BJÖRKLUND

  Håkan Björklund
	

 	
 	
/s/ CHARLES HARWOOD

  Charles Harwood
	

 	
 	
/s/ BRIAN MARKISON

  Brian Markison
	

 	
 	
/s/ ROBERT O'NEIL

  Robert O'Neil

 

 

 
 

					
	

Acknowledged and agreed

as of the date of this Restated Letter:	
 	
 
	

Avista Healthcare Public Acquisition Corp.	
 	
 
	
 By:	
 	
/s/ DAVID BURGSTAHLER  	
 	
 
	 	 	

  	 	 
	Name:	 	David Burgstahler	 	 
	Title:	 	President and Chief Executive Officer	 	 

 

 F-3

 

        Please
indicate your agreement to the terms of this Letter Agreement by signing where indicated below. 

 

 
 

							
	 	 	Very truly yours,
	

 	
 	
Avista Acquisition Corp.
	

 	
 	
By:	
 	
/s/ DAVID BURGSTAHLER

 
	 	 	 	 	Name:	 	David Burgstahler
	 	 	 	 	Title:	 	 President and Chief Executive Officer
	

 	
 	
Solely in their capacity as a holder of Class B Shares and Private Placement Warrants:
	

 	
 	
/s/ Håkan Björklund

  Håkan Björklund
	

 	
 	
/s/ CHARLES HARWOOD

  Charles Harwood
	

 	
 	
/s/ BRIAN MARKISON

  Brian Markison
	

 	
 	
/s/ ROBERT O'NEIL

  Robert O'Neil
	
 Acknowledged and agreed

as of the date of this Letter Agreement:	
 	
 	
 	
 	
 	
 
	
 Avista Healthcare Public Acquisition Corp.	
 	
 	
 	
 	
 	
 

 

  

 

 
 

							
	By:	 	/s/ DAVID BURGSTAHLER

 	 	 
	 	 	Name:	 	David Burgstahler	 	 
	 	 	Title:	 	 President and Chief Executive Officer	 	 

 

 F-4

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