<SEC-DOCUMENT>0001104659-23-118341.txt : 20231114
<SEC-HEADER>0001104659-23-118341.hdr.sgml : 20231114
<ACCEPTANCE-DATETIME>20231114214711
ACCESSION NUMBER:		0001104659-23-118341
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20231101
FILED AS OF DATE:		20231114
DATE AS OF CHANGE:		20231114

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Dean Thompson
		CENTRAL INDEX KEY:			0001069096
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408911

	MAIL ADDRESS:	
		STREET 1:		65 EAST 55TH STREET, 18TH FLOOR
		STREET 2:		C/O AVISTA CAPITAL PARTNERS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	FORMER NAME:	
		FORMER CONFORMED NAME:	DEAN THOMPSON
		DATE OF NAME CHANGE:	19980827

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Burgstahler David F
		CENTRAL INDEX KEY:			0001374179

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408912

	MAIL ADDRESS:	
		STREET 1:		C/O WARNER CHILCOTT HOLDINGS CO., LTD.
		STREET 2:		100 ENTERPRISE DRIVE
		CITY:			ROCKAWAY
		STATE:			NJ
		ZIP:			07866

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Tamaroff Joshua Alexander
		CENTRAL INDEX KEY:			0001705548

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408910

	MAIL ADDRESS:	
		STREET 1:		C/O AVISTA CAPITAL PARTNERS
		STREET 2:		65 EAST 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Avista Capital Managing Member V, LLC
		CENTRAL INDEX KEY:			0001957307
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408916

	BUSINESS ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-593-6900

	MAIL ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Avista Capital Partners (Offshore) V, L.P.
		CENTRAL INDEX KEY:			0001774143
		STATE OF INCORPORATION:			D0
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408913

	BUSINESS ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-593-6900

	MAIL ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Avista Capital Partners V, L.P.
		CENTRAL INDEX KEY:			0001774142
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408914

	BUSINESS ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-593-6900

	MAIL ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Avista Capital Partners V GP, L.P.
		CENTRAL INDEX KEY:			0001957305
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40720
		FILM NUMBER:		231408915

	BUSINESS ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-593-6900

	MAIL ADDRESS:	
		STREET 1:		65 E. 55TH STREET, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OmniAb, Inc.
		CENTRAL INDEX KEY:			0001846253
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5980 HORTON STREET
		STREET 2:		SUITE 600
		CITY:			EMERYVILLE
		STATE:			CA
		ZIP:			94608
		BUSINESS PHONE:		510-250-7800

	MAIL ADDRESS:	
		STREET 1:		5980 HORTON STREET
		STREET 2:		SUITE 600
		CITY:			EMERYVILLE
		STATE:			CA
		ZIP:			94608

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Avista Public Acquisition Corp. II
		DATE OF NAME CHANGE:	20210212
</SEC-HEADER>
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        <issuerName>OmniAb, Inc.</issuerName>
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            <rptOwnerCity>NEW YORK</rptOwnerCity>
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    <reportingOwner>
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            <rptOwnerName>Avista Capital Partners V GP, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
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    <reportingOwner>
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            <rptOwnerCik>0001774142</rptOwnerCik>
            <rptOwnerName>Avista Capital Partners V, L.P.</rptOwnerName>
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        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
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    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001774143</rptOwnerCik>
            <rptOwnerName>Avista Capital Partners (Offshore) V, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <otherText></otherText>
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    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001374179</rptOwnerCik>
            <rptOwnerName>Burgstahler David F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
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            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001069096</rptOwnerCik>
            <rptOwnerName>Dean Thompson</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
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            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705548</rptOwnerCik>
            <rptOwnerName>Tamaroff Joshua Alexander</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
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            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock, par value $0.0001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2023-11-01</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
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                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F11"/>
                    <footnoteId id="F13"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-11-01</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
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                <footnoteId id="F3"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                    <value>17770</value>
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                <transactionPricePerShare>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
                <footnoteId id="F10"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.0001</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>17770</value>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>35538</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F10"/>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F11"/>
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            </ownershipNature>
        </derivativeTransaction>
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            <securityTitle>
                <value>Restricted Stock Units</value>
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            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.0001</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>20000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.81</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2033-06-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.0001</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>40000</value>
                    <footnoteId id="F6"/>
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                <sharesOwnedFollowingTransaction>
                    <value>40000</value>
                    <footnoteId id="F6"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F6"/>
                    <footnoteId id="F11"/>
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            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
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            <conversionOrExercisePrice>
                <value>3.35</value>
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            <exerciseDate>
                <footnoteId id="F14"/>
            </exerciseDate>
            <expirationDate>
                <value>2032-12-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.0001</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>200000</value>
                    <footnoteId id="F14"/>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>200000</value>
                    <footnoteId id="F14"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F11"/>
                    <footnoteId id="F14"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>11.5</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F12"/>
                <footnoteId id="F13"/>
            </exerciseDate>
            <expirationDate>
                <value>2027-11-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.0001</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>11345489</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11345489</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Notes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F13"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This form is being filed by each of the following Reporting Persons: (i) Avista Capital Partners V, L.P., a Delaware limited partnership (&quot;ACP V Onshore&quot;), (ii) Avista Capital Partners (Offshore) V, L.P., a Bermuda limited partnership (&quot;ACP V Offshore&quot;), (iii) Avista Capital Partners V GP, L.P., a Delaware limited partnership (&quot;ACP V GP&quot;), which is the general partner of ACP V Onshore and ACP V Offshore, (iv) Avista Capital Managing Member V, LLC, a Delaware limited liability company (&quot;Avista Managing Member&quot;), which is the general partner of ACP V GP, (v) each of Thompson Dean and David Burgstahler, who are the managers of Avista Managing Member (together with ACP V GP and Avista Managing Member, the &quot;Avista Affiliates&quot;), and (vi) Joshua Tamaroff, who is a director of OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) (the &quot;Issuer&quot;).</footnote>
        <footnote id="F2">ACP V Onshore directly holds 7,283,484 shares of common stock and 5,224,114 warrants. ACP V Offshore directly holds 8,534,450 shares of common stock and 6,121,375 warrants. Each of the Avista Affiliates may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates disclaims beneficial ownership of the securities reported on this line item, except to the extent of their pecuniary interest therein, if any.</footnote>
        <footnote id="F3">Vesting of restricted stock units (&quot;RSUs&quot;) previously granted to the Reporting Persons.</footnote>
        <footnote id="F4">Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. Vesting occurs in three substantially equal annual installments, beginning November 1, 2023.</footnote>
        <footnote id="F5">Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest in full on the earlier of (i) the date of the next annual meeting of the Company's stockholders following the grant date and (ii) the first anniversary of the grant date.</footnote>
        <footnote id="F6">Represents stock options granted to Mr. Tamaroff in his capacity as a director of the Issuer, which stock options vest and become exercisable in full on the earlier of (i) the date of the next annual meeting of the Company's stockholders following the grant date and (ii) the first anniversary of the grant date.</footnote>
        <footnote id="F7">In accordance with the letter agreement, dated March 23, 2022, by and among the Issuer, Avista Acquisition LP II, a Cayman Islands limited partnership (&quot;Avista Sponsor&quot;), and other parties (the &quot;Letter Agreement&quot;), if the Triggering Event (as defined in the Letter Agreement) has not occurred during the Earnout Period (as defined in the Letter Agreement), 1,293,299 shares of common stock will be automatically forfeited to the Issuer for no consideration.</footnote>
        <footnote id="F8">As a result of the liquidation and distribution of all of the assets of the Avista Sponsor to its limited partners, ACP V Onshore and ACP V Offshore (the &quot;Avista Sponsor Liquidating Distribution&quot;), and pursuant to a Joinder to the Letter Agreement entered into on December 9, 2022 between ACP V Onshore, ACP V Offshore, Avista Sponsor and the Issuer, ACP V Onshore directly holds 595,508 of the shares of common stock subject to forfeiture pursuant to the terms of the Letter Agreement, and ACP V Offshore holds 697,791 of the shares of common stock subject to forfeiture pursuant to the terms of the Letter Agreement.</footnote>
        <footnote id="F9">Additionally, in connection with the Avista Sponsor Liquidating Distribution, each of ACP V Onshore and ACP V Offshore provided to the Issuer an agreement stating that they will each be bound by the transfer restrictions included in the Amended and Restated Registration and Stockholder Rights Agreement, dated as of November 1, 2022, among the Issuer, the Sponsor and the other signatories thereto (the &quot;A&amp;R RSRA&quot;) for the duration of the Founder Shares Lock Up Period (as defined in the A&amp;R RSRA).</footnote>
        <footnote id="F10">Represents restricted stock units (&quot;RSUs&quot;) granted to Mr. Tamaroff in his capacity as a director of the Issuer, which RSUs vest as to the shares underlying the award in three substantially similar annual installments beginning on November 1, 2023, subject to Mr. Tamaroff's continuing service as a director of the Issuer through the applicable vesting date; provided, that the RSUs shall vest in full (i) in the event of a Change of Control (as defined in the Issuer's 2022 Incentive Award Plan), to the extent Mr. Tamaroff is serving as a director at the time of such transaction, or (ii) in the event that Mr. Tamaroff ceases to serve as a director by reason of death or Permanent Disability (as defined in the Issuer's 2022 Incentive Award Plan).</footnote>
        <footnote id="F11">Mr. Tamaroff is a partner at an affiliate of the Avista Affiliates and has assigned all rights, title and interest in any securities of the Issuer to an affiliate of the Avista Affiliates controlled by Mr. Dean and Mr. Burgstahler. The Avista Affiliates, ACP V Onshore and ACP V Offshore are each &quot;directors by deputization&quot; for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Each of the Avista Affiliates and Mr. Tamaroff may be deemed to beneficially own the securities reported on this line item to the extent of their respective pecuniary interests. Each of the Avista Affiliates, ACP V Onshore and ACP V Offshore and Mr. Tamaroff disclaims beneficial ownership of the securities issued to Mr. Tamaroff, except to the extent of their pecuniary interest therein, if any.</footnote>
        <footnote id="F12">In connection with the completion of the Issuer's August 2021 initial public offering, Avista Sponsor purchased 8,233,333 warrants in a private placement from the Issuer, each exercisable to purchase (subject, initially, to the satisfaction of certain material conditions) one share of common stock for $11.50 per share. The material conditions to exercise were satisfied upon the closing of the transactions contemplated by the Agreement and Plan of Merger, dated March 23, 2022, by and among the Issuer, Avista Sponsor and other parties (the &quot;Closing&quot;), and the warrants by their terms became exercisable (including by cash settlement) on December 1, 2022.</footnote>
        <footnote id="F13">In connection with the Amended and Restated Forward Purchase Agreement, dated March 23, 2022, by and among the Issuer, Avista Sponsor and other parties (the &quot;A&amp;R Forward Purchase Agreement&quot;), Avista Sponsor purchased an aggregate 3,112,156 warrants in private placements from the Issuer, each exercisable to purchase (subject, initially, to the satisfaction of certain material conditions) one share of common stock for $11.50 per share. The material conditions to exercise were satisfied on the Closing, and the warrants by their terms became exercisable (including by cash settlement) December 31, 2022.</footnote>
        <footnote id="F14">Represents stock options granted to Mr. Tamaroff in his capacity as a director of the Issuer, which stock options vest in three substantially similar annual installments beginning on November 1, 2023. The Form 4s filed by the Reporting Persons on December 5, 2022 and December 13, 2022 incorrectly reported that 161,849 stock options and 161,849 shares of common stock underlying such stock options were issued to Mr. Tamaroff.</footnote>
    </footnotes>

    <remarks>Exhibit 99.1 (Joint Filer Information and Signatures) is hereby incorporated by reference herein.</remarks>

    <ownerSignature>
        <signatureName>See Exhibit 99.1</signatureName>
        <signatureDate>2023-11-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>tm2330765d1_ex99-1.htm
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="text-align: right; margin: 0"><B>Exhibit 99.1</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%">Avista Capital Managing Member V, LLC</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>Address of Joint Filer:</TD>
    <TD>65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>Relationship of Joint Filer to Issuer:</TD>
    <TD>10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>Issuer Name and Ticker or Trading Symbol:</TD>
    <TD>OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD>November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>Designated Filer:</TD>
    <TD>Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="text-transform: uppercase"><B>Avista CAPITAL MANAGING
MEMBER V, LLC</B></FONT></P></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; font-size: 10pt">Name:</TD>
    <TD STYLE="width: 45%; font-size: 10pt">Benjamin Silbert</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">Title:</TD>
    <TD STYLE="font-size: 10pt">Attorney-in-fact</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<!-- Field: Page; Sequence: 1 -->
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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(continued)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">Avista Capital Partners V GP, L.P.</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="text-transform: uppercase"><B>Avista CAPITAL PARTNERS
V GP, L.P.</B></FONT></P></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; font-size: 10pt">Name:</TD>
    <TD STYLE="width: 45%; font-size: 10pt">Benjamin Silbert</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">Title:</TD>
    <TD STYLE="font-size: 10pt">Attorney-in-fact</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 2 -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(continued)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">Avista Capital Partners V, L.P.</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt"><FONT STYLE="text-transform: uppercase"><B>Avista CAPITAL PARTNERS V, L.P.</B></FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; font-size: 10pt">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; font-size: 10pt">Name:</TD>
    <TD STYLE="width: 45%; font-size: 10pt">Benjamin Silbert</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">Title:</TD>
    <TD STYLE="font-size: 10pt">Attorney-in-fact</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 3 -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><U>Joint Filer Information.</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(continued)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">Avista Capital Partners (Offshore) V, L.P.</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt"><FONT STYLE="text-transform: uppercase"><B>Avista CAPITAL PARTNERS (OFFSHORE) V, l.P.</B></FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; font-size: 10pt">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; font-size: 10pt">Name:</TD>
    <TD STYLE="width: 45%; font-size: 10pt">Benjamin Silbert</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">Title:</TD>
    <TD STYLE="font-size: 10pt">Attorney-in-fact</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 4 -->
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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">Thompson Dean</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 1.25pt; font-size: 10pt">By:</TD>
    <TD STYLE="border-bottom: black 1pt solid; font-size: 10pt">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 46%; font-size: 10pt">Name: Benjamin Silbert, Attorney-in-Fact for Thompson Dean</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 5 -->
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(continued)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">David Burgstahler</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 1.25pt; font-size: 10pt">By:</TD>
    <TD STYLE="border-bottom: black 1pt solid">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">/s/ Benjamin Silbert</P></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 46%; font-size: 10pt">Name: Benjamin Silbert, Attorney-in-Fact for David Burgstahler</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><U>Joint Filer Information</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(continued)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%; font-size: 10pt">Name of Joint Filer:</TD>
    <TD STYLE="width: 50%; font-size: 10pt">Joshua Tamaroff</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Address of Joint Filer:</TD>
    <TD STYLE="font-size: 10pt">65 East 55th Street, 18th Floor</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt">New York, NY 10022</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Relationship of Joint Filer to Issuer:</TD>
    <TD STYLE="font-size: 10pt">10% Owner, Director</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Issuer Name and Ticker or Trading Symbol:</TD>
    <TD STYLE="font-size: 10pt">OmniAb,Inc. [OABI]</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Date of Earliest Transaction Required to be Reported (Month/Day/Year):</TD>
    <TD STYLE="font-size: 10pt">November 1, 2023</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Designated Filer:</TD>
    <TD STYLE="font-size: 10pt">Avista Capital Managing Member V, LLC</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2" STYLE="font-size: 10pt">Signature:</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 1.25pt; font-size: 10pt">By:</TD>
    <TD STYLE="border-bottom: black 1pt solid; font-size: 10pt">/s/ Benjamin Silbert</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 46%; font-size: 10pt">Name: Benjamin Silbert, Attorney-in-Fact for Joshua Tamaroff</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: November 14, 2023</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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