Document:

Exhibit 4.1

 

	NUMBER             	             SHARES
	 	 
	SEE REVERSE FOR CERTAIN DEFINITIONS	 
	CUSIP [ ]

 

OMNIAB, INC.

A DELAWARE CORPORATION

COMMON STOCK

 

	This Certifies	 	 
	that	 	 
	is the owner of	 	 

 

FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON
STOCK, $0.0001 PAR VALUE

PER SHARE EACH, OF

OMNIAB, INC.

(THE “CORPORATION”)

 

transferable on the books of the Corporation in person or by duly authorized
attorney upon surrender of this certificate properly endorsed.

 

This certificate is not valid unless countersigned by the Transfer
Agent and registered by the Registrar of the Corporation.

 

Witness the seal of the Corporation and the facsimile signatures of
its duly authorized officers.

 

	 	 	 	 	 
	Chief Executive Officer	 	[Corporate Seal] Delaware	 	Chief Financial Officer

 

Transfer Agent:

 

	 	 
	Name:	 
	Title:	 

 

OMNIAB, INC.

 

The Corporation will furnish without charge to each stockholder who
so requests the powers, designations, preferences and relative, participating, optional or other special rights of each class of shares
or series thereof of the Corporation and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate
and the shares represented hereby are issued and shall be held subject to all the provisions of the Certificate of Incorporation and all
amendments thereto and resolutions of the Board of Directors providing for the issue of securities (copies of which may be obtained from
the secretary of the Corporation), to all of which the holder(s) of this certificate by acceptance hereof assent(s).

 

The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

 

	TEN COM	—	as tenants in common	UNIF GIFT MIN ACT	—	Custodian
	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 
	 	 	 	 	 	Under Uniform Gifts to
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	 	
    Minors

    Act

    (State)

 

     

     

    

 

Additional abbreviations may also be used though not in the above list.

 

For
value received,                  
hereby sell(s), assign(s) and transfer(s) unto

 

	 
	(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))
	 
	 
	(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))
	 

 

_______Shares of the capital stock represented by the
within Certificate, and do(es) hereby irrevocably constitute(s) and appoint(s)             
attorney to transfer the said shares on the books of the within named Corporation with full power of substitution in the premises

 

Dated:

 

NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH
THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

 

Signature(s) Guaranteed By:

 

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM,
PURSUANT TO S.E.C. RULE 17Ad-15).Exhibit 10.13

 

OMNIAB, INC.

 

2022 OMNIAB SERVICE PROVIDER ASSUMED AWARD PLAN

 

ARTICLE ONE

 

GENERAL PROVISIONS

 

	I.	PURPOSE OF THE PLAN

 

The Corporation is a party
to the transactions contemplated by that certain Separation and Distribution Agreement, dated as of March 23, 2022, by and among Ligand,
the Corporation, Avista Public Acquisition Corp. II (“Merger Parent”), and Orwell Merger Sub Inc. (collectively the “Parties”,
and such agreement, as amended from time to time, the “Separation Agreement”), that certain Amended and Restated Employee
Matters Agreement, dated as of August [__], 2022, by and among Ligand, the Corporation, and Merger Parent (as amended from time to time,
the “Employee Matters Agreement”), and that certain Agreement and Plan of Merger, dated as of March 23, 2022, by and among
the Parties (as amended from time to time, the “Merger Agreement”). As a result of the Distribution, outstanding Company Equity
Awards granted under the Company Equity Plans will be adjusted into Company Equity Awards and/or SpinCo Equity Awards as set forth in
Article IV of the Employee Matters Agreement.  This Plan is intended to govern the SpinCo Equity Awards held by SpinCo Service Providers
assumed by the Corporation and converted into such SpinCo Equity Awards at the Distribution Time in accordance with the terms of the Employee
Matters Agreement.

 

Pursuant to Section 4.2(d)
of the Employee Matters Agreement, as of the Effective Time, each SpinCo Equity Award that is then outstanding and unexercised shall be
converted into the right to receive an award relating to shares of Domesticated Parent Common Stock upon substantially the same terms
and conditions as are in effect with respect to such SpinCo Equity Award immediately prior to the Effective Time (other than terms that
have been rendered inoperative by the Transactions), including with respect to vesting and termination-related provisions (each, an “Adjusted
Parent Equity Award”), except that such Adjusted Parent Equity Award shall be adjusted as provided in Section 4.2(d) of the Employee
Matters Agreement.  As of the Effective Time, Merger Parent will assume this Plan and all outstanding SpinCo Equity Awards hereunder
(which shall become Adjusted Parent Equity Awards) in accordance with the terms of Article IV of the Employee Matters Agreement.

 

Capitalized terms shall have
the meanings assigned to such terms in the attached Appendix.

 

	II.	STRUCTURE OF THE PLAN

 

A.            The Plan shall be divided
into three separate equity incentives programs:

 

1.       the Discretionary Option Grant
Program under which eligible persons may, at the discretion of the Plan Administrator, be granted options to purchase shares of Common
Stock,

 

2.       the Stock Issuance Program
under which eligible persons may, at the discretion of the Plan Administrator, be issued shares of Common Stock, and

 

3.       the Other Stock Award Program
under which eligible persons may, at the discretion of the Plan Administrator, be granted restricted stock units, stock appreciation rights
and dividend equivalents.

 

B.            The provisions of Articles
One, Five and Six shall apply to all equity programs under the Plan and shall govern the interests of all persons under the Plan.

 

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	III.	ADMINISTRATION OF THE PLAN

 

A.            The Primary Committee shall
have sole and exclusive authority to administer the Plan with respect to Section 16 Insiders (other than non-employee Board members, whose
Awards shall be administered by the full Board, as provided below). Administration of the Plan with respect to all other persons eligible
to participate in those programs may, at the Board’s discretion, be vested in the Primary Committee or a Secondary Committee, or
the Board may retain the power to administer those programs with respect to all such persons. However, any discretionary Awards for members
of the Primary Committee must be authorized by a disinterested majority of the Board.

 

B.            Members of the Primary Committee
or any Secondary Committee shall serve for such period of time as the Board may determine and may be removed by the Board at any time.
The Board may also at any time terminate the functions of any Secondary Committee and reassume all powers and authority previously delegated
to such committee.

 

C.            Each Plan Administrator
shall, within the scope of its administrative functions under the Plan, have full power and authority (subject to the provisions of the
Plan) to establish such rules and regulations as it may deem appropriate for proper administration of the Plan and to make such determinations
under, and issue such interpretations of, the provisions of those programs and any outstanding Awards thereunder as it may deem necessary
or advisable. Decisions of the Plan Administrator within the scope of its administrative functions under the Plan shall be final and binding
on all parties who have an interest in the equity incentive programs under its jurisdiction or any Award thereunder.

 

D.            Service on the Primary Committee
or the Secondary Committee shall constitute service as a Board member, and members of each such committee shall accordingly be entitled
to full indemnification and reimbursement as Board members for their service on such committee. No member of the Primary Committee or
the Secondary Committee shall be liable for any act or omission made in good faith with respect to the Plan or any Awards under the Plan.

 

E.            Notwithstanding the foregoing,
the full Board shall administer the Plan with respect to any Awards to the non-employee members of the Board.  In addition, in its
sole discretion, the Board may at any time and from time to time exercise any and all rights and duties of the Primary Committee or any
Secondary Committee under the Plan except with respect to matters which under Rule 16b-3 under the Exchange Act, or any regulations or
rules issued thereunder, are required to be determined in the sole discretion of the Primary Committee.

 

	IV.	ELIGIBILITY

 

A.            The persons eligible to
participate in the Plan are the holders of the Adjusted Awards.

 

B.            Each Plan Administrator
shall, within the scope of its administrative jurisdiction under the Plan, have full authority to determine the time or times when each
Adjusted Award is to become exercisable, the vesting schedule (if any) applicable to the Adjusted Award, the maximum term for which the
Adjusted Award is to remain outstanding and such other terms and conditions of such Adjusted Award as the Plan Administrator determines
are appropriate.

 

	V.	STOCK SUBJECT TO THE PLAN

 

A.            Subject to adjustment pursuant
to this Section V, the number of shares of Common Stock which may be issued or transferred pursuant to Awards under the Plan is equal
to the number of shares of Common Stock underlying all Adjusted Awards.

 

B.            [Reserved]

 

C.            [Reserved]

 

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D.            If any change is made to the Common Stock by
reason of any stock split, stock or cash dividend (other than normal cash dividends), recapitalization, combination of shares, exchange
of shares or other change affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration,
equitable adjustments shall be made by the Plan Administrator to (i) the maximum number and/or class of securities issuable under the
Plan, (ii) the number and/or class of securities and the exercise or purchase price per share in effect under each outstanding Award
under the Plan, and (iii) the terms and conditions of any outstanding Awards (including, without limitation, any applicable performance
targets or criteria with respect thereto). Such adjustments to the outstanding Awards are to be effected in a manner which shall preclude
the enlargement or dilution of rights and benefits under such Awards. The adjustments determined by the Plan Administrator shall be final,
binding and conclusive.

 

E.            Subject to Article Two,
Section III, Article Three, Section II and Article Four, Section V, in the event of any transaction or event described in Section V.D
or any unusual or nonrecurring transactions or events affecting the Corporation, any affiliate of the Corporation, or the financial statements
of the Corporation or any affiliate, or of changes in applicable laws, regulations or accounting principles, including, without limitation,
a Change in Control or a Hostile Take-Over, the Plan Administrator, in its sole and absolute discretion, and on such terms and conditions
as it deems appropriate, either by the terms of the Award or by action taken prior to the occurrence of such transaction or event and
either automatically or upon the Optionee’s or Participant’s request, is hereby authorized to take any one or more of the
following actions whenever the Plan Administrator determines that such action is appropriate in order to prevent dilution or enlargement
of the benefits or potential benefits intended to be made available under the Plan or with respect to any Award under the Plan, to facilitate
such transactions or events or to give effect to such changes in laws, regulations or principles:

 

1.        To provide for either
(A) termination of any such Award in exchange for an amount of cash, if any, equal to the amount that would have been attained upon
the exercise of such Award or realization of the Optionee’s or Participant’s rights (and, for the avoidance of doubt, if
as of the date of the occurrence of the transaction or event described in this Section V.E the Plan Administrator determines in good
faith that no amount would have been attained upon the exercise of such Award or realization of the Optionee’s or
Participant’s rights, then such Award may be terminated by the Corporation without payment) or (B) the replacement of such
Award with other rights or property selected by the Plan Administrator in its sole discretion;

 

2.        To provide that such Award
be assumed by the successor or survivor corporation, or a parent or subsidiary thereof, or shall be substituted for by similar Awards
covering the stock of the successor or survivor corporation, or a parent or subsidiary thereof, with appropriate adjustments as to the
number and kind of shares and prices;

 

3.        To make adjustments in the
number and type of shares of Common Stock (or other securities or property) subject to outstanding Awards, and in the number and/or in
the terms and conditions of (including the grant or exercise price), and the criteria included in, outstanding Awards;

 

4.        To provide that such Award
shall be exercisable or payable or fully vested with respect to all shares covered thereby, notwithstanding anything to the contrary in
the Plan or the applicable award agreement; and

 

5.        To provide that the Award
cannot vest, be exercised or become payable after such event.

 

F.            In the event of any pending
stock dividend, stock split, combination or exchange of shares, merger, consolidation or other distribution (other than normal cash dividends)
of Corporation assets to stockholders, or any other change affecting the shares of Common Stock or the share price of the Common Stock,
for reasons of administrative convenience, the Corporation in its sole discretion may refuse to permit the exercise of any Award during
a period of thirty (30) days prior to the consummation of any such transaction.

 

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ARTICLE TWO

 

DISCRETIONARY OPTION GRANT PROGRAM

 

	I.	OPTION TERMS

 

Each option shall be evidenced
by one or more documents in the form approved by the Plan Administrator; provided, however, that each such document shall comply with
the terms specified below. Each document evidencing an Incentive Option shall, in addition, be subject to the provisions of the Plan applicable
to such options.

 

A.            EXERCISE PRICE.

 

1.        The exercise price per share
shall be fixed by the Plan Administrator but shall not be less than one hundred percent (100%) of the Fair Market Value per share of Common
Stock on the option grant date.

 

2.        The exercise price shall become
immediately due upon exercise of the option and shall, subject to the provisions of the documents evidencing the option, be payable in
one or more of the forms specified below:

 

(i)        cash or check made payable
to the Corporation,

 

(ii)        shares of Common Stock
held by the Optionee or otherwise issuable upon exercise of the option and valued at Fair Market Value on the Exercise Date,

 

(iii)        to the extent the option
is exercised for vested shares, through a special sale and remittance procedure pursuant to which the Optionee shall concurrently provide
irrevocable instructions to (a) a Corporation-designated brokerage firm to effect the immediate sale of the purchased shares and remit
to the Corporation, out of the sale proceeds available on the settlement date, sufficient funds to cover the aggregate exercise price
payable for the purchased shares plus all applicable income and employment taxes required to be withheld by the Corporation by reason
of such exercise and (b) the Corporation to deliver the certificates for the purchased shares directly to such brokerage firm in order
to complete the sale, or

 

(iv)        with the consent of the
Plan Administrator, a promissory note bearing interest at no less than such rate as shall then preclude the imputation of interest under
the Code.

 

Except to the extent such
sale and remittance procedure is utilized, payment of the exercise price for the purchased shares must be made on the Exercise Date.  Notwithstanding
any other provision of the Plan to the contrary, no Optionee who is a member of the Board or an “executive officer” of the
Corporation within the meaning of Section 13(k) of the Exchange Act shall be permitted to pay the exercise price of an option, or continue
any extension of credit with respect to the exercise of an option, with a loan from the Corporation or a loan arranged by the Corporation
in violation of Section 13(k) of the Exchange Act.

 

B.            EXERCISE AND TERM OF OPTIONS.
Each option shall be exercisable at such time or times, during such period and for such number of shares as shall be determined by the
Plan Administrator and set forth in the documents evidencing the option. However, no option shall have a term in excess of ten (10) years
measured from the option grant date.

 

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C.            EFFECT OF TERMINATION OF
SERVICE.

 

1.        The following provisions shall
govern the exercise of any options held by the Optionee at the time of cessation of Service or death:

 

(i)       Any option outstanding
at the time of the Optionee’s cessation of Service for any reason shall remain exercisable for such period of time thereafter as
shall be determined by the Plan Administrator and set forth in the documents evidencing the option, but no such option shall be exercisable
after the expiration of the option term.

 

(ii)       Any option held by the
Optionee at the time of death and exercisable in whole or in part at that time may be subsequently exercised by the personal representative
of the Optionee’s estate or by the person or persons to whom the option is transferred pursuant to the Optionee’s will or
the laws of inheritance or by the Optionee’s designated beneficiary or beneficiaries of that option.

 

(iii)       During the applicable
post-Service exercise period, the option may not be exercised in the aggregate for more than the number of vested shares for which the
option is exercisable on the date of the Optionee’s cessation of Service. Upon the expiration of the applicable exercise period
or (if earlier) upon the expiration of the option term, the option shall terminate and cease to be outstanding for any vested shares for
which the option has not been exercised. However, the option shall, immediately upon the Optionee’s cessation of Service, terminate
and cease to be outstanding to the extent the option is not otherwise at that time exercisable for vested shares.

 

2.        The Plan Administrator shall
have complete discretion, exercisable either at the time an option is granted or at any time while the option remains outstanding, to:

 

(i)       extend the period of time
for which the option is to remain exercisable following the Optionee’s cessation of Service from the limited exercise period otherwise
in effect for that option to such greater period of time as the Plan Administrator shall deem appropriate, but in no event beyond the
expiration of the option term, and/or

 

(ii)       permit the option to be
exercised, during the applicable post-Service exercise period, not only with respect to the number of vested shares of Common Stock for
which such option is exercisable at the time of the Optionee’s cessation of Service but also with respect to one or more additional
installments in which the Optionee would have vested had the Optionee continued in Service.

 

D.            STOCKHOLDER RIGHTS. The
holder of an option shall have no stockholder rights with respect to the shares subject to the option until such person shall have exercised
the option, paid the exercise price and become a holder of record of the purchased shares.

 

E.            REPURCHASE RIGHTS. The Plan
Administrator shall have the discretion to grant options which are exercisable for unvested shares of Common Stock. Should the Optionee
cease Service while holding such unvested shares, the Corporation shall have the right to repurchase any or all of those unvested shares.
The terms upon which such repurchase right shall be exercisable (including the period and procedure for exercise and the appropriate vesting
schedule for the purchased shares) shall be established by the Plan Administrator and set forth in the document evidencing such repurchase
right.

 

F.            LIMITED
TRANSFERABILITY OF OPTIONS. During the lifetime of the Optionee, Incentive Options shall be exercisable only by the Optionee and
shall not be assignable or transferable other than by will or the laws of inheritance following the Optionee’s death.
Non-Statutory Options shall be subject to the same restriction, except that a Non-Statutory Option may be assigned in whole or in
part during the Optionee’s lifetime to one or more members of the Optionee’s family or to a trust established
exclusively for one or more such family members or to Optionee’s former spouse, to the extent such assignment is in connection
with the Optionee’s estate plan or pursuant to a domestic relations order. The assigned portion may only be exercised by the
person or persons who acquire a proprietary interest in the option pursuant to the assignment. The terms applicable to the assigned
portion shall be the same as those in effect for the option immediately prior to such assignment and shall be set forth in such
documents issued to the assignee as the Plan Administrator may deem appropriate. Notwithstanding the foregoing, the Optionee may
also designate one or more persons as the beneficiary or beneficiaries of his or her outstanding options under this Article Two, and
those options shall, in accordance with such designation, automatically be transferred to such beneficiary or beneficiaries upon the
Optionee’s death while holding those options. Such beneficiary or beneficiaries shall take the transferred options subject to
all the terms and conditions of the applicable agreement evidencing each such transferred option, including (without limitation) the
limited time period during which the option may be exercised following the Optionee’s death.

 

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	II.	INCENTIVE OPTIONS

 

The terms specified below
shall be applicable to all Incentive Options. Except as modified by the provisions of this Section II, all the provisions of Articles
One, Five and Six shall be applicable to Incentive Options.  To the extent an option which is designated as an Incentive Option fails
to meet the requirements of Section 422 of the Code, then such option shall be treated as a Non-Statutory Option.  Options which
are specifically designated as Non-Statutory Options when issued under the Plan shall not be subject to the terms of this Section II.

 

A.            ELIGIBILITY. Incentive Options
may only be granted to Employees.

 

B.            DOLLAR LIMITATION. The aggregate
Fair Market Value of the shares of Common Stock (determined as of the respective date or dates of grant) for which one or more options
granted to any Employee under the Plan (or any other option plan of the Corporation or any Parent or Subsidiary) may for the first time
become exercisable as Incentive Options during any one calendar year shall not exceed the sum of One Hundred Thousand Dollars ($100,000).
To the extent the Employee holds two (2) or more such options which become exercisable for the first time in the same calendar year, the
foregoing limitation on the exercisability of such options as Incentive Options shall be applied on the basis of the order in which such
options are granted.

 

C.            10% STOCKHOLDER. If any
Employee to whom an Incentive Option is granted is a 10% Stockholder, then the exercise price per share shall not be less than one hundred
ten percent (110%) of the Fair Market Value per share of Common Stock on the option grant date, and the option term shall not exceed five
(5) years measured from the option grant date.

 

	III.	CHANGE IN CONTROL/HOSTILE TAKE-OVER

 

A.            In
the event of a Change in Control, each outstanding option under the Discretionary Option Grant Program shall automatically
accelerate so that each such option shall, immediately prior to the effective date of that Change in Control, become exercisable for
all the shares of Common Stock at the time subject to such option and may be exercised for any or all of those shares as fully
vested shares of Common Stock. However, an outstanding option shall NOT become exercisable on such an accelerated basis if and to
the extent: (i) such option is to be assumed by the successor corporation (or parent thereof) or is otherwise to continue in full
force and effect pursuant to the terms of the Change in Control transaction or (ii) such option is to be replaced with a cash
incentive program of the successor corporation which preserves the spread existing at the time of the Change in Control on any
shares for which the option is not otherwise at that time exercisable and provides for subsequent payout of that spread in
accordance with the same exercise/vesting schedule applicable to those option shares or (iii) the acceleration of such option is
subject to other limitations imposed by the Plan Administrator at the time of the option grant.

 

B.            All outstanding repurchase
rights under the Discretionary Option Grant Program shall automatically terminate, and the shares of Common Stock subject to those terminated
rights shall immediately vest in full, in the event of a Change in Control, except to the extent: (i) those repurchase rights are to be
assigned to the successor corporation (or parent thereof) or are otherwise to continue in full force and effect pursuant to the terms
of the Change in Control transaction or (ii) such accelerated vesting is precluded by other limitations imposed by the Plan Administrator
at the time the repurchase right is issued.

 

C.            Immediately
following the consummation of the Change in Control, all outstanding options under the Discretionary Option Grant Program shall
terminate and cease to be outstanding, except to the extent assumed by the successor corporation (or parent thereof) or otherwise
continued in full force and effect pursuant to the terms of the Change in Control transaction.

 

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D.            Each option which is assumed
in connection with a Change in Control or otherwise continued in effect shall be appropriately adjusted, immediately after such Change
in Control, to apply to the number and class of securities which would have been issuable to the Optionee in consummation of such Change
in Control had the option been exercised immediately prior to such Change in Control. Appropriate adjustments shall also be made to the
exercise price payable per share under each outstanding option, provided the aggregate exercise price payable for such securities shall
remain the same (subject only to reduction by reason of rounding). To the extent the actual holders of the Corporation’s outstanding
Common Stock receive cash consideration for their Common Stock in consummation of the Change in Control, the successor corporation may,
in connection with the assumption of the outstanding options under the Discretionary Option Grant Program, substitute one or more shares
of its own common stock with a fair market value equivalent to the cash consideration paid per share of Common Stock in such Change in
Control transaction.

 

E.            The
Plan Administrator shall have the discretionary authority to structure one or more outstanding options under the Discretionary
Option Grant Program so that those options shall, immediately prior to the effective date of a Change in Control, become exercisable
for all the shares of Common Stock at the time subject to those options and may be exercised for any or all of those shares as fully
vested shares of Common Stock, whether or not those options are to be assumed in the Change in Control transaction or otherwise
continued in effect. In addition, the Plan Administrator shall have the discretionary authority to structure one or more of the
Corporation’s repurchase rights under the Discretionary Option Grant Program so that those rights shall immediately terminate
upon the consummation of the Change in Control transaction, and the shares subject to those terminated rights shall thereupon vest
in full.

 

F.            The Plan Administrator shall
have full power and authority to structure one or more outstanding options under the Discretionary Option Grant Program so that those
options shall become exercisable for all the shares of Common Stock at the time subject to those options in the event the Optionee’s
Service is subsequently terminated by reason of an Involuntary Termination within a designated period (not to exceed eighteen (18) months)
following the effective date of any Change in Control transaction in which those options do not otherwise accelerate. In addition, the
Plan Administrator may structure one or more of the Corporation’s repurchase rights so that those rights shall immediately terminate
with respect to any shares held by the Optionee at the time of such Involuntary Termination, and the shares subject to those terminated
repurchase rights shall accordingly vest in full at that time.

 

G.            The Plan Administrator shall
have the discretionary authority to structure one or more outstanding options under the Discretionary Option Grant Program so that those
options shall, immediately prior to the effective date of a Hostile Take-Over, become exercisable for all the shares of Common Stock at
the time subject to those options and may be exercised for any or all of those shares as fully vested shares of Common Stock. In addition,
the Plan Administrator shall have the discretionary authority to structure one or more of the Corporation’s repurchase rights under
the Discretionary Option Grant Program so that those rights shall terminate automatically upon the consummation of such Hostile Take-Over,
and the shares subject to those terminated rights shall thereupon vest in full. Alternatively, the Plan Administrator may condition the
automatic acceleration of one or more outstanding options under the Discretionary Option Grant Program and the termination of one or more
of the Corporation’s outstanding repurchase rights under such program upon the subsequent termination of the Optionee’s Service
by reason of an Involuntary Termination within a designated period (not to exceed eighteen (18) months) following the effective date of
such Hostile Take-Over.

 

H.            The
portion of any Incentive Option accelerated in connection with a Change in Control or Hostile Take-Over shall remain exercisable as
an Incentive Option only to the extent the applicable One Hundred Thousand Dollar ($100,000) limitation is not exceeded. To the
extent such dollar limitation is exceeded, the accelerated portion of such option shall be exercisable as a Nonstatutory Option
under the Federal tax laws.

 

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I.            The outstanding options
shall in no way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure
or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets.

 

ARTICLE THREE

 

STOCK ISSUANCE PROGRAM

 

 

	I.	STOCK ISSUANCE TERMS

 

Shares of Common Stock may
be issued under the Stock Issuance Program through direct and immediate issuances without any intervening option grants. Each such stock
issuance shall be evidenced by a Stock Issuance Agreement which complies with the terms specified below. Shares of Common Stock may also
be issued under the Stock Issuance Program pursuant to share right awards which entitle the recipients to receive those shares upon the
attainment of designated performance goals or the satisfaction of specified Service requirements.

 

A.            PURCHASE PRICE.

 

1.             The purchase price per share,
if any, shall be fixed by the Plan Administrator.

 

2.             Shares of Common Stock may
be issued under the Stock Issuance Program for any form of consideration as the Plan Administrator may deem appropriate in each individual
instance, including, without limitation:

 

(i)        cash or check made payable
to the Corporation, or

 

(ii)        past services rendered
to the Corporation (or any Parent or Subsidiary), or

 

(iii)        future services to be
rendered to the Corporation (or any Parent or Subsidiary).

 

B.            RESTRICTIONS.  Shares
of Common Stock issued under this Stock Issuance Program shall be subject to such restrictions on transferability and other restrictions
as the Plan Administrator may impose (including, without limitation, limitations on the right to vote such shares or the right to receive
dividends on such shares).  These restrictions may lapse separately or in combination at such times, pursuant to such circumstances,
in such installments, or otherwise, as the Plan Administrator determines at the time of the grant of the shares or thereafter. Notwithstanding
the foregoing, with respect to shares of Common Stock issued under this Stock Issuance Program subject to vesting, dividends which are
paid prior to vesting shall only be paid out to the Participant to the extent that the vesting conditions are subsequently satisfied and
the share vests.

 

C.            FORFEITURE.  Except
as otherwise determined by the Plan Administrator at the time of the grant of the shares or thereafter, upon termination of employment
or service during the applicable restriction period, shares of Common Stock issued under this Stock Issuance Program that are at that
time subject to restrictions shall be forfeited; provided, however, that, the Plan Administrator may (a) provide in any award agreement
that restrictions or forfeiture conditions relating to such shares will be waived in whole or in part in the event of terminations resulting
from specified causes, and (b) in other cases waive in whole or in part restrictions or forfeiture conditions relating to such shares.

 

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	II.	CHANGE IN CONTROL/HOSTILE TAKE-OVER

 

A.            All
of the Corporation’s outstanding forfeiture restrictions or repurchase rights on any shares of Common Stock issued under the
Stock Issuance Program shall terminate automatically, and all the shares of Common Stock subject to those terminated rights shall
immediately vest in full, in the event of any Change in Control, except to the extent (i) those forfeiture restrictions or
repurchase rights are to be assigned to the successor corporation (or parent thereof) or are otherwise to continue in full force and
effect pursuant to the terms of the Change in Control transaction or (ii) such accelerated vesting is precluded by other limitations
imposed in the Stock Issuance Agreement.

 

B.            The Plan Administrator shall
have the discretionary authority to structure one or more of the Corporation’s forfeiture restrictions or repurchase rights under
the Stock Issuance Program so that those rights shall automatically terminate in whole or in part, and the shares of Common Stock subject
to those terminated rights shall immediately vest, in the event the Participant’s Service should subsequently terminate by reason
of an Involuntary Termination within a designated period (not to exceed eighteen (18) months) following the effective date of any Change
in Control transaction in which those forfeiture restrictions or repurchase rights are assigned to the successor corporation (or parent
thereof) or are otherwise continued in effect.

 

C.            The Plan Administrator shall
also have the discretionary authority to structure one or more of the Corporation’s forfeiture restrictions or repurchase rights
under the Stock Issuance Program so that those rights shall automatically terminate in whole or in part, and the shares of Common Stock
subject to those terminated rights shall immediately vest, either upon the occurrence of a Hostile Take-Over or upon the subsequent termination
of the Participant’s Service by reason of an Involuntary Termination within a designated period (not to exceed eighteen (18) months)
following the effective date of that Hostile Take-Over.

 

	III.	SHARE ESCROW/LEGENDS

 

Unvested shares may, in the
Plan Administrator’s discretion, be held in escrow by the Corporation until the Participant’s interest in such shares vests
or may be issued directly to the Participant with restrictive legends on the certificates evidencing those unvested shares.

 

ARTICLE FOUR

 

OTHER STOCK AWARDS PROGRAM

 

	I.	STOCK APPRECIATION RIGHTS

 

A.            A stock appreciation right
may be granted to any eligible person selected by the Plan Administrator.  A stock appreciation right shall be subject to such terms
and conditions not inconsistent with the Plan as the Plan Administrator shall impose and shall be evidenced by a stock appreciation right
agreement.

 

B.            A stock appreciation right
shall entitle the Participant (or other person entitled to exercise the stock appreciation right pursuant to the Plan) to exercise all
or a specified portion of the stock appreciation right (to the extent then exercisable pursuant to its terms) and to receive from the
Corporation an amount equal to the product of (i) the excess of (A) the Fair Market Value of the Common Stock on the date the stock appreciation
right is exercised over (B) the Fair Market Value of the Common Stock on the date the stock appreciation right was granted and (ii) the
number of shares of Common Stock with respect to which the stock appreciation right is exercised, subject to any limitations the Plan
Administrator may impose.  The exercise or base price per share of a stock appreciation right shall be fixed by the Plan Administrator
but shall not be less than one hundred percent (100%) of the Fair Market Value per share of Common Stock on the date the stock appreciation
right was granted.

 

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C.            Subject
to Section I.B above, payment of the amounts determined under Sections I.B. above shall be in cash, in Common Stock (based on its
Fair Market Value as of the date the stock appreciation right is exercised) or a combination of both, as determined by the Plan
Administrator. To the extent any payment is effected in Stock, it shall be made subject to satisfaction of all provisions of Article
Two above pertaining to options.

 

D.            Each stock appreciation
right shall be exercisable at such time or times, during such period and for such number of shares as shall be determined by the Plan
Administrator and set forth in the documents evidencing the stock appreciation right. However, no stock appreciation right shall have
a term in excess of ten (10) years measured from the date the stock appreciation right was granted.

 

	II.	DIVIDEND EQUIVALENTS

 

Any eligible person selected
by the Plan Administrator may be granted dividend equivalents based on the dividends declared on the shares of Common Stock that are subject
to any Award, to be credited as of dividend payment dates, during the period between the date the Award is granted and the date the Award
is exercised, vests or expires, as determined by the Plan Administrator.  Such dividend equivalents shall be converted to cash or
additional shares of Common Stock by such formula and at such time and subject to such limitations as may be determined by the Plan Administrator.
  Notwithstanding anything to the contrary, dividends or dividend equivalents with respect to an Award that is subject to vesting
that are based on dividends paid prior to the vesting of such Award shall only be paid out to the extent that the vesting conditions are
subsequently satisfied and the Award vests. In addition, notwithstanding anything to the contrary, no dividend equivalents shall be payable
with respect to options or stock appreciation rights.

 

	III.	RESTRICTED STOCK UNITS

 

The Plan Administrator is
authorized to make Awards of restricted stock units (a right to shares of Common Stock deliverable in the future) to any eligible person
selected by the Plan Administrator in such amounts and subject to such terms and conditions as determined by the Plan Administrator.  At
the time of grant, the Plan Administrator shall specify the date or dates on which the restricted stock units shall become fully vested
and nonforfeitable, and may specify such conditions to vesting as it deems appropriate.  At the time of grant, the Plan Administrator
shall specify the maturity date applicable to each grant of restricted stock units which shall be no earlier than the vesting date or
dates of the Award and may be determined at the election of the grantee.  On the maturity date, the Corporation shall, subject to
Article Six, Section V,  transfer to the Participant one unrestricted, fully transferable share of Common Stock for each restricted
stock unit scheduled to be paid out on such date and not previously forfeited.

 

	IV.	OTHER TERMS

 

A.            Except as otherwise provided
herein, the term of any award of stock appreciation rights, dividend equivalents or restricted stock units shall be set by the Plan Administrator
in its discretion.

 

B.            Except as otherwise provided
herein, the Plan Administrator may establish the exercise or purchase price, if any, of any award of stock appreciation rights, dividend
equivalents or restricted stock units.

 

C.            An award of stock appreciation
rights, dividend equivalents or restricted stock units shall only be exercisable or payable prior to the Participant’s termination
of Service; provided, however, that the Plan Administrator in its sole and absolute discretion may provide that an award of stock
appreciation rights, dividend equivalents or restricted stock units may be exercised or paid subsequent to a termination of Service, as
applicable, or following a Change in Control of the Corporation, or because of the Participant’s retirement, death or disability,
or otherwise.

 

D.            Payments with respect to
any Awards granted under this Article Four shall be made in cash, in Stock or a combination of both, as determined by the Committee.

 

E.            All Awards under this Article
Four shall be subject to such additional terms and conditions as determined by the Plan Administrator and shall be evidenced by an award
agreement.

 

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	V.	CHANGE IN CONTROL/HOSTILE TAKE-OVER

 

A.            In the event of a Change
in Control, each outstanding Award under the Other Stock Award Program shall automatically accelerate so that each such Award shall, immediately
prior to the effective date of that Change in Control, become vested and exercisable and/or payable with respect to all the shares of
Common Stock at the time subject to such Award and may be exercised or paid for any or all of those shares as fully vested shares of Common
Stock. However, an outstanding Award shall NOT become vested and exercisable and/or payable on such an accelerated basis if and to the
extent: (i) such Award is to be assumed by the successor corporation (or parent thereof) or is otherwise to continue in full force and
effect pursuant to the terms of the Change in Control transaction or (ii) such Award is to be replaced with a cash incentive program of
the successor corporation which preserves the spread existing at the time of the Change in Control on any shares for which the Award is
not otherwise at that time vested, exercisable or payable and provides for subsequent payout of that spread in accordance with the same
exercise/vesting/payment schedule applicable to those Award shares or (iii) the acceleration of such Award is subject to other limitations
imposed by the Plan Administrator at the time of the Award grant.

 

B.            Immediately following the
consummation of the Change in Control, all outstanding Awards under the Other Stock Award Program shall terminate and cease to be outstanding,
except to the extent assumed by the successor corporation (or parent thereof) or otherwise continued in full force and effect pursuant
to the terms of the Change in Control transaction.

 

C.            Each
Award which is assumed in connection with a Change in Control or otherwise continued in effect shall be appropriately adjusted,
immediately after such Change in Control, to apply to the number and class of securities which would have been issuable to the
Participant in consummation of such Change in Control had the Award been exercised or paid immediately prior to such Change in
Control. Appropriate adjustments shall also be made to the exercise or purchase price payable per share under each outstanding
Award, provided the aggregate exercise or purchase price payable for such securities shall remain the same. To the extent the actual
holders of the Corporation’s outstanding Common Stock receive cash consideration for their Common Stock in consummation of the
Change in Control, the successor corporation may, in connection with the assumption of the outstanding Awards under the Other Stock
Award Program, substitute one or more shares of its own common stock with a fair market value equivalent to the cash consideration
paid per share of Common Stock in such Change in Control transaction.

 

D.            The Plan Administrator shall
have the discretionary authority to structure one or more outstanding Awards under the Other Stock Award Program so that those Awards
shall, immediately prior to the effective date of a Change in Control, become vested and exercisable and/or payable exercisable for all
the shares of Common Stock at the time subject to those Awards and may be exercised or paid for any or all of those shares as fully vested
shares of Common Stock, whether or not those Awards are to be assumed in the Change in Control transaction or otherwise continued in effect.
In addition, the Plan Administrator shall have the discretionary authority to structure one or more of the Corporation’s repurchase
rights under the Other Stock Award Program so that those rights shall immediately terminate upon the consummation of the Change in Control
transaction, and the shares subject to those terminated rights shall thereupon vest in full.

 

E.            The Plan Administrator shall
have full power and authority to structure one or more outstanding Awards under the Other Stock Award Program so that those Awards shall
become vested and exercisable and/or payable for all the shares of Common Stock at the time subject to those Awards in the event the Participant’s
Service is subsequently terminated by reason of an Involuntary Termination within a designated period (not to exceed eighteen (18) months)
following the effective date of any Change in Control transaction in which those Awards do not otherwise accelerate.

 

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F.            The
Plan Administrator shall have the discretionary authority to structure one or more outstanding Awards under the Other Stock Award Program
so that those Awards shall, immediately prior to the effective date of a Hostile Take-Over, become vested and exercisable and/or payable
for all the shares of Common Stock at the time subject to those Awards and may be exercised or paid for any or all of those shares as
fully vested shares of Common Stock. Alternatively, the Plan Administrator may condition the automatic acceleration of one or more outstanding
Awards under the Other Stock Award Program upon the subsequent termination of the Optionee’s Service by reason of an Involuntary
Termination within a designated period (not to exceed eighteen (18) months) following the effective date of such Hostile Take-Over.

 

G.            The outstanding Awards shall
in no way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure
or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets.

 

ARTICLE FIVE

 

[RESERVED]

 

ARTICLE SIX

 

MISCELLANEOUS

 

	I.	TAX WITHHOLDING

 

A.            The Corporation’s
obligation to deliver shares of Common Stock upon the exercise, vesting or payment of Awards under the Plan shall be subject to the satisfaction
of all applicable income and employment tax withholding requirements.

 

B.            The Plan Administrator may,
in its discretion, provide any or all holders of Awards under the Plan with the right to use shares of Common Stock in satisfaction of
all or part of the Withholding Taxes to which such holders may become subject in connection with the exercise, vesting or payment of their
Awards. Such right may be provided to any such holder in either or both of the following formats:

 

Stock Withholding: The election
to have the Corporation withhold, from the shares of Common Stock otherwise issuable upon the exercise, vesting or payment of such Award,
a portion of those shares with an aggregate Fair Market Value equal to the minimum required percentage of the Withholding Taxes.

 

Stock Delivery: The election
to deliver to the Corporation, at the time the Award is exercised, vests or is paid, one or more shares of Common Stock previously acquired
by such holder (other than in connection with the exercise, vesting or payment triggering the Withholding Taxes) and held for at least
six (6) months (or such other period determined by the Plan Administrator) with an aggregate Fair Market Value equal to the percentage
of the Withholding Taxes (not to exceed one hundred percent (100%)) designated by the holder.

 

C.            Notwithstanding
any other provision of the Plan, the number of shares of Common Stock which may be withheld or delivered by the Participant in order
to satisfy the Withholding Taxes with respect to the exercise, vesting or payment of an Award shall be limited to the number of
shares of Common Stock which have a Fair Market Value on the date of withholding or delivery equal to the aggregate amount of such
Withholding Taxes based on the minimum statutory withholding rates for federal, state, local and foreign income tax and payroll tax
purposes that are applicable to such supplemental taxable income or such higher rate as may approved by the Plan Administrator
(which rates shall in no event exceed the maximum individual statutory tax rate in the applicable jurisdiction at the time of such
withholding (or such other rate as may be required to avoid the liability classification of the applicable award under generally
accepted accounting principles in the United States of America)); provided, however, unless otherwise approved by the Plan
Administrator, to the extent such shares of Common Stock were acquired by the Participant from the Company as compensation, the
shares of Common Stock must have been held for the minimum period required by applicable accounting rules to avoid a charge to the
Company’s earnings for financial reporting purposes; provided, further, that the number of shares of Common Stock withheld or
delivered shall be rounded up to the nearest whole share sufficient to cover the Withholding Taxes to the extent rounding up to the
nearest whole share does not result in the liability classification of the applicable Award under generally accepted accounting
principles in the United States of America.

 

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	II.	EFFECTIVE DATE AND TERM OF THE PLAN

 

A.            This Plan will become effective
on the Effective Date.

 

B.            The Plan shall terminate
upon the earlier to occur of (i) the termination of all Awards under the Plan, or (ii) the termination of all outstanding Awards in connection
with a Change in Control. In the event of the termination of the Plan, then all Awards outstanding at that time shall continue to have
force and effect in accordance with the provisions of the documents evidencing such Awards.

 

	III.	AMENDMENT OF THE PLAN

 

The Board shall have complete
and exclusive power and authority to amend or modify the Plan in any or all respects. However, no such amendment or modification shall
adversely affect the rights and obligations with respect to Awards at the time outstanding under the Plan unless the Optionee or the Participant
consents to such amendment or modification. In addition, certain amendments may require stockholder approval pursuant to applicable laws
or regulations.  Except as permitted by Article One, Section V, Article Two, Section III or Article Four, Section V in connection
with a transaction specified in Article One, Section V.D or V.E (including, without limitation, any Change in Control, Hostile Take-Over,
stock dividend, stock split, extraordinary cash dividend, recapitalization, combination of shares or exchange of shares), the terms of
outstanding Awards may not be amended to reduce the exercise price of outstanding options or stock appreciation rights or cancel, exchange,
substitute, buyout or surrender outstanding options or stock appreciation rights in exchange for cash, other Awards or options or stock
appreciation rights with an exercise price that is less than the exercise price of the original options or stock appreciation rights without
stockholder approval.

 

	IV.	USE OF PROCEEDS

 

Any cash proceeds received
by the Corporation from the sale of shares of Common Stock under the Plan shall be used for general corporate purposes.

 

	V.	REGULATORY APPROVALS

 

A.            The implementation of the
Plan, the granting of any Award under the Plan and the issuance of any shares of Common Stock under the Plan shall be subject to the Corporation’s
procurement of all approvals and permits required by regulatory authorities having jurisdiction over the Plan, the Awards granted under
it and the shares of Common Stock issued pursuant to it.

 

B.            No shares of Common Stock
or other assets shall be issued or delivered under the Plan unless and until there shall have been compliance with all applicable requirements
of applicable securities laws, including the filing and effectiveness of a registration statement for the shares of Common Stock issuable
under the Plan, and all applicable listing requirements of any stock exchange (or the Nasdaq Global Market, if applicable) on which Common
Stock is then listed for trading.

 

C.            All
stock certificates delivered pursuant to the Plan are subject to any stop-transfer orders and other restrictions as the Plan
Administrator deems necessary or advisable to comply with federal, state, or foreign jurisdiction, securities or other laws, rules
and regulations and the rules of any national securities exchange or automated quotation system on which the Stock is listed,
quoted, or traded.  The Plan Administrator may place legends on any stock certificate to reference restrictions applicable to
the Common Stock.  In addition to the terms and conditions provided herein, the Board may require that an Optionee or
Participant make such reasonable covenants, agreements, and representations as the Board, in its discretion, deems advisable in
order to comply with any such laws, regulations, or requirements. The Plan Administrator shall have the right to require any
Optionee or Participant to comply with any timing or other restrictions with respect to the settlement or exercise of any Award,
including a window-period limitation, as may be imposed in the discretion of the Plan Administrator.

 

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D.            Notwithstanding any other
provision of the Plan, unless otherwise determined by the Plan Administrator or required by any applicable law, rule or regulation, the
Corporation shall not deliver to any Optionee or Participant certificates evidencing shares of Common Stock issued in connection with
any award and instead such shares of Common Stock shall be recorded in the books of the Corporation (or, as applicable, its transfer agent
or stock plan administrator).

 

E.            In the event that the Corporation
establishes, for itself or using the services of a third party, an automated system for the documentation, granting or exercise of Awards,
such as a system using an internet website or interactive voice response, then the paperless documentation, granting or exercise of Awards
by an Optionee or a Participant may be permitted through the use of such an automated system.

 

	VI.	NO EMPLOYMENT/SERVICE RIGHTS

 

Nothing in the Plan shall
confer upon the Optionee or the Participant any right to continue in Service for any period of specific duration or interfere with or
otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining such person) or Ligand
(or any Parent or Subsidiary) or of the Optionee or the Participant, which rights are hereby expressly reserved by each, to terminate
such person’s Service at any time for any reason, with or without cause.

 

	VII.	COMPLIANCE WITH SECTION 409A OF THE CODE

 

To the extent that the
Plan Administrator determines that any Award granted under the Plan is subject to Section 409A of the Code, the agreement evidencing
such Award shall incorporate the terms and conditions required by Section 409A of the Code.  To the extent applicable, the Plan
and Award agreements shall be interpreted in accordance with Section 409A of the Code and Department of Treasury regulations and
other interpretive guidance issued thereunder, including without limitation any such regulations or other guidance that may be
issued after the adoption of the Plan.  Notwithstanding any provision of the Plan to the contrary, in the event that following
the adoption of the Plan the Plan Administrator determines that any Award may be subject to Section 409A of the Code and related
Department of Treasury guidance (including such Department of Treasury guidance as may be issued after the adoption of the Plan),
the Plan Administrator may adopt such amendments to the Plan and the applicable Award agreement or adopt other policies and
procedures (including amendments, policies and procedures with retroactive effect), or take any other actions, that the Plan
Administrator determines are necessary or appropriate to (a) exempt the Award from Section 409A of the Code and/or preserve the
intended tax treatment of the benefits provided with respect to the Award, or (b) comply with the requirements of Section 409A of
the Code and related Department of Treasury guidance.

 

	VIII.	FORFEITURE AND CLAW-BACK PROVISIONS

A.            Pursuant
to its general authority to determine the terms and conditions applicable to Awards under the Plan, the Plan Administrator shall
have the right to provide, in the terms of Awards made under the Plan, or to require a participant to agree by separate written or
electronic instrument, that: (1) any proceeds, gains or other economic benefit actually or constructively received by the
participant upon any receipt or exercise of the Award, or upon the receipt or resale of any shares underlying the Award, must be
paid to the Corporation, and (2) the Award shall terminate and any unexercised portion of the Award (whether or not vested) shall be
forfeited, if (i) a termination of Service occurs prior to a specified date, or within a specified time period following receipt or
exercise of the Award, (ii) the participant at any time, or during a specified time period, engages in any activity in competition
with the Corporation, or which is inimical, contrary or harmful to the interests of the Corporation, as further defined by the Plan
Administrator or (iii) the participant incurs a termination of Service for Misconduct; and

 

    14

     

    

 

B.            All Awards (including any
proceeds, gains or other economic benefit actually or constructively received by a participant upon any receipt or exercise of any Award
or upon the receipt or resale of any shares underlying the Award) shall be subject to the applicable provisions of any claw-back policy
implemented by the Corporation, whether implemented prior to or after the grant of such Award, including without limitation, any claw-back
policy adopted to comply with the requirements of applicable law, including without limitation, the Dodd-Frank Wall Street Reform and
Consumer Protection Act and any rules or regulations promulgated thereunder, to the extent set forth in such claw-back policy and/or in
the applicable Award agreement.

 

	IX.	ADJUSTED AWARDS

A.            It
is the intention that each Adjusted Award shall be subject to the same terms and conditions as applied to the original Company
Equity Award to which such Adjusted Award relates immediately prior to the effective time of the Distribution, as provided in this
Plan and the applicable award agreement, except (i) to the extent such terms are rendered inoperative by reason of the Transactions,
(ii) to reflect the adjustment of such Adjusted Award pursuant to Article IV of the Employee Matters Agreement, (iii) to reflect
that the Corporation is the issuer of the Common Stock subject to the Adjusted Award, and (iv) to reflect the holder of such
Adjusted Award’s status as an employee, director or consultant of the Corporation or Ligand (or their respective Parents or
Subsidiaries), as applicable, following the Transactions. Nothing in this Plan or in any applicable award agreement evidencing an
Adjusted Award is intended to provide the holder of any Adjusted Award with additional benefits to those that the holder had under
the original Company Equity Award to which such Adjusted Award relates.  In the event of any inconsistency between the terms of
an Adjusted Award and this Plan and the original Company Equity Award to which such Adjusted Award relates (and the Company Equity
Plan under which it was originally granted) that provides the holder of any Adjusted Award with an additional benefit in violation
of Section 424 or Section 409A of the Code, the terms of the original Company Equity Award shall be deemed to apply to such Adjusted
Award so that no such additional benefit shall apply.

 

B.            The conversion of the Adjusted
Awards pursuant to the Distribution is intended to comply in all respects with the requirements of Section 424 and Section 409A of the
Code, to the extent applicable, and all such provisions of this Plan, the Employee Matters Agreement and each award agreement shall be
interpreted and implemented in accordance with the foregoing.

 

C.            Notwithstanding the foregoing,
with respect to any unvested Adjusted Award, if the original Company Equity Award to which such Adjusted Award relates was subject, as
of immediately prior to the Distribution, to accelerated vesting provisions (i) by reference to a termination of employment or Service
with Ligand (or any Parent or Subsidiary) and/or (ii) in connection with a “Change in Control” (as defined in the applicable
award agreement and/or Company Equity Plan) of Ligand, then the Adjusted Award also shall be subject to such same acceleration provisions
upon the Adjusted Award holder’s termination of employment or Service with the Corporation (or any Parent or Subsidiary) and/or
in connection with a Change in Control.

 

D.            In no event shall the vesting
of any Adjusted Awards accelerate solely by reason of the transactions or events contemplated by any Transaction Document.

 

    15

     

    

 

APPENDIX

 

The following definitions shall be in effect under
the Plan:

 

	 	A.	ADJUSTED AWARD shall mean a SpinCo Equity Award held by a SpinCo Service Provider that is assumed by Merger Parent at the Effective Time and becomes an Adjusted Parent Equity Award.

 

	 	B.	ADJUSTED PARENT EQUITY AWARD shall have the meaning given to such term in Article One, Section I.

 

	 	C.	AWARD shall mean any Adjusted Award.

  

	 	D.	BOARD shall mean the Corporation’s Board of Directors.

 

	 	E.	CHANGE IN CONTROL shall mean a change in ownership or control of the Corporation effected through any of the following transactions:

 

	 	a.	a merger, consolidation or other reorganization approved by the Corporation’s stockholders, unless securities representing more than fifty percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned, directly or indirectly and in substantially the same proportion, by the persons who beneficially owned the Corporation’s outstanding voting securities immediately prior to such transaction, or

 

	 	b.	the sale, transfer or other disposition of all or substantially all of the Corporation’s assets in complete liquidation or dissolution of the Corporation, or

 

	 	c.	the acquisition, directly or indirectly by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation), of beneficial ownership (within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly to the Corporation’s stockholders.

 

None of the Transactions shall constitute
a Change in Control.

 

	 	F.	CODE shall mean the Internal Revenue Code of 1986, as amended.

 

	 	G.	COMMON STOCK shall mean the Corporation’s common stock.

 

	 	H.	COMPANY EQUITY AWARDS shall have the meaning set forth in the Employee Matters Agreement.

 

	 	I.	COMPANY EQUITY PLANS shall have the meaning set forth in the Employee Matters Agreement.

 

	 	J.	CORPORATION shall mean OmniAb, Inc., a Delaware corporation, and any corporate successor to all or substantially all of the assets or voting stock of the Corporation which shall by appropriate action adopt or assume the Plan, including, as of the Effective Time, Merger Parent.

 

	 	K.	DISCRETIONARY OPTION GRANT PROGRAM shall mean the
    discretionary option grant program in effect under Article Two of the Plan.

 

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	 	L.	DISTRIBUTION shall have the meaning set forth in the Merger Agreement.

 

	 	M.	DISTRIBUTION TIME shall have the meaning set forth in the Employee Matters Agreement.

 

	 	N.	DOMESTICATED PARENT COMMON STOCK shall have the meaning set forth in the Merger Agreement.

 

	 	O.	EFFECTIVE DATE shall mean the date immediately prior to the date on which the Distribution occurs.

 

	 	P.	EFFECTIVE TIME shall have the meaning set forth in the Merger Agreement.

 

	 	Q.	EMPLOYEE shall mean an individual who is in the employ of the Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of performance.

 

	 	R.	EMPLOYEE MATTERS AGREEMENT shall have the meaning given to such term in Article One, Section I.

 

	 	S.	EXERCISE DATE shall mean the date on which the Corporation shall have received written notice of the option exercise.

 

	 	T.	FAIR MARKET VALUE per share of Common Stock on any relevant date shall be determined in accordance with the following provisions:

 

	 	a.	If the Common Stock is at the time traded on the Nasdaq Global Market, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question, as such price is reported by the National Association of Securities Dealers on the Nasdaq Global Market and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists.

  

	 	b.	If the Common Stock is at the time listed on any Stock Exchange, then the Fair Market Value shall be the closing selling price per share of Common Stock on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as such price is officially quoted in the composite tape of transactions on such exchange and published in The Wall Street Journal. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists.

 

	 	U.	HOSTILE TAKE-OVER shall mean a change in ownership or control of the Corporation effected through either of the following transactions:

 

	 	a.	a change in the composition of
    the Board over a period of thirty-six (36) consecutive months or less such that a majority of the Board members ceases, by reason of
    one or more contested elections for Board membership, to be comprised of individuals who either (A) have been Board members
    continuously since the beginning of such period or (B) have been elected or nominated for election as Board members during such
    period by at least a majority of the Board members described in clause (A) who were still in office at the time the Board approved
    such election or nomination, or

 

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	 	b.	a Hostile Tender-Offer.

 

	 	O. 	HOSTILE TENDER-OFFER shall mean the acquisition, directly or indirectly, by any person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation) of beneficial ownership (within the meaning of Rule 13d-3 of the 1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly to the Corporation’s stockholders which the Board does not recommend such stockholders to accept.

 

	 	P.	INCENTIVE OPTION shall mean an option which satisfies the requirements of Code Section 422.

 

	 	Q.	INVOLUNTARY TERMINATION shall mean the termination of the Service of any individual which occurs by reason of:

  

	 	a.	such individual’s involuntary dismissal or discharge by the Corporation for reasons other than Misconduct, or

 

	 	b.	such individual’s voluntary resignation following (A) a change in his or her position with the Corporation which materially reduces his or her duties and responsibilities or the level of management to which he or she reports, (B) a reduction in his or her level of compensation (including base salary, fringe benefits and target bonus under any corporate-performance based bonus or incentive programs) by more than fifteen percent (15%) or (C) a relocation of such individual’s place of employment by more than fifty (50) miles, provided and only if such change, reduction or relocation is effected by the Corporation without the individual’s consent.

 

	 	R.	LIGAND shall mean Ligand Pharmaceuticals Incorporated, a Delaware corporation.

 

	 	S.	MERGER AGREEMENT shall have the meaning given to such term in Article One, Section I.

 

	 	T.	MERGER PARENT shall have the meaning given to such term in Article One, Section I.

 

	 	U.	MISCONDUCT shall mean the commission of any act of fraud, embezzlement or dishonesty by the Optionee or Participant, any unauthorized use or disclosure by such person of confidential information or trade secrets of the Corporation (or any Parent or Subsidiary), or any other intentional misconduct by such person adversely affecting the business or affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the right of the Corporation (or any Parent or Subsidiary) to discharge or dismiss any Optionee, Participant or other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not be deemed, for purposes of the Plan, to constitute grounds for termination for Misconduct.

 

	 	V.	1934 ACT shall mean the Securities Exchange Act of 1934, as amended.

 

	 	W.	NON-STATUTORY OPTION shall mean an option not intended to satisfy the requirements of Code Section 422.

 

	 	X.	OPTIONEE shall mean any holder of an Adjusted Award that is an option.

 

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	 	Y.	OTHER STOCK AWARD PROGRAM shall mean the discretionary stock award grant program in effect under Article Four of the Plan

 

	 	Z.	PARENT shall mean any corporation (other than the Corporation) in an unbroken chain of corporations ending with the Corporation, provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain.

 

	 	AA.	PARTICIPANT shall mean any holder of an Adjusted Award other than an option.

 

	 	BB.	PARTIES shall have the meaning given to such term in Article One, Section I.

 

	 	CC.	PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the inability of the Optionee or the Participant to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment expected to result in death or to be of continuous duration of twelve (12) months or more. However, solely for purposes of the Awards granted to non-employee Board members, Permanent Disability or Permanently Disabled shall mean the inability of the non-employee Board member to perform his or her usual duties as a Board member by reason of any medically determinable physical or mental impairment expected to result in death or to be of continuous duration of twelve (12) months or more.

 

	 	DD.	PLAN shall mean this 2022 OmniAb Service Provider Assumed Award Plan.

 

	 	EE.	PLAN ADMINISTRATOR shall mean the particular entity, whether the Primary Committee, the Board or the Secondary Committee, which is authorized to administer the Plan with respect to one or more classes of eligible persons, to the extent such entity is carrying out its administrative functions under those programs with respect to the persons under its jurisdiction.

 

	 	FF.	PRIMARY COMMITTEE shall mean the committee of two (2) or more non-employee Board members appointed by the Board to administer the Discretionary Option Grant and Stock Issuance Programs with respect to Section 16 Insiders.

 

	 	GG.	SECONDARY COMMITTEE shall mean a committee of one or more Board members appointed by the Board to administer the Discretionary Option Grant, Stock Issuance and Other Stock Award Programs with respect to eligible persons other than Section 16 Insiders.

 

	 	HH.	SECTION 16 INSIDER shall mean an officer or director of the Corporation subject to the short-swing profit liabilities of Section 16 of the 1934 Act.

 

	 	II.	SEPARATION AGREEMENT shall have the meaning given to such term in Article One, Section I.

 

	 	JJ.	SERVICE shall mean the performance of services for the Corporation (or any Parent or Subsidiary) by a person in the capacity of an Employee, a non-employee member of the board of directors or a consultant or independent advisor, except to the extent otherwise specifically provided in the documents evidencing the option grant or stock issuance.

 

	 	KK.	SPINCO EQUITY AWARD shall have the meaning set forth in the Employee Matters Agreement.

 

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	 	LL.	SPINCO SERVICE PROVIDER shall have the meaning set forth in the Employee Matters Agreement.

 

	 	MM.	STOCK EXCHANGE shall mean either the American Stock Exchange or the New York Stock Exchange.

 

	 	NN.	STOCK ISSUANCE AGREEMENT shall mean the agreement entered into by the Corporation and the Participant at the time of issuance of shares of Common Stock under the Stock Issuance Program.

 

	 	OO.	STOCK ISSUANCE PROGRAM shall mean the stock issuance program in effect under Article Three of the Plan.

 

	 	PP.	SUBSIDIARY shall mean any corporation (other than the Corporation) in an unbroken chain of corporations beginning with the Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain.

 

	 	QQ.	10% STOCKHOLDER shall mean the owner of stock (as determined under Code Section 424(d)) possessing more than ten percent (10%) of the total combined voting power of all classes of stock of the Corporation (or any Parent or Subsidiary).

 

	 	RR.	TRANSACTION DOCUMENTS shall have the meaning set forth in the Merger Agreement.

  

	 	SS.	TRANSACTIONS shall have the meaning set forth in the Merger Agreement.

 

	 	TT.	WITHHOLDING TAXES shall mean the applicable income and employment withholding taxes to which the holder of Non-Statutory Options or unvested shares of Common Stock may become subject in connection with the exercise of those options or the vesting of those shares.

 

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