Form of Restricted Stock Unit Award Agreement under the Companys 2022 Employment Inducement Plan

Ligand Pharmaceuticals Incorporated, a Delaware corporation (the “Corporation”), pursuant to its 2022 Employment Inducement Plan (the “Plan”), hereby grants to the holder listed below (“Participant”), an award of restricted stock units (“Restricted Stock Units” or “RSUs”) with respect to the number of shares of the Corporation’s common stock (the “Shares”). This award for Restricted Stock Units (this “RSU Award”) is subject to all of the terms and conditions as set forth herein and in the Restricted Stock Unit Award Agreement attached hereto as Exhibit A (the “Restricted Stock Unit Agreement”) and the Plan, each of which are incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Grant Notice and the Restricted Stock Unit Agreement.

By his or her acceptance of this Restricted Stock Unit Grant, Participant agrees to be bound by the terms and conditions of the Plan, the Restricted Stock Unit Agreement and this Grant Notice. Participant has reviewed the Restricted Stock Unit Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant Notice and fully understands all provisions of this Grant Notice, the Restricted Stock Unit Agreement and the Plan. Participant has been provided with a copy or electronic access to a copy of the prospectus for the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Plan Administrator upon any questions arising under the Plan, this Grant Notice or the Restricted Stock Unit Agreement.

Pursuant to the Restricted Stock Unit Award Grant Notice (the “Grant Notice”) to which this Restricted Stock Unit Award Agreement (this “Agreement”) is attached, Ligand Pharmaceuticals Incorporated, a Delaware corporation (the “Corporation”), has granted to Participant the right to receive the number of RSUs under the Corporation’s 2022 Employment Inducement Plan (the “Plan”) indicated in the Grant Notice, with respect to the number of shares of the Corporation’s common stock (the “Stock”). The RSU Award and this Agreement are subject to the Plan, the terms and conditions of which are incorporated herein by reference. In the event of any inconsistency between the Plan and this Agreement, the terms of the Plan shall control.

1.1Award of Restricted Stock Units; Employment Inducement Award.

(a)Award. In consideration of Participant’s agreement to commence employment with and remain in the employ of the Corporation (or a Parent or Subsidiary), and for other good and valuable consideration, the Corporation hereby grants to Participant the right to receive the number of RSUs set forth in the Grant Notice, subject to all of the terms and conditions set forth in this Agreement, the Grant Notice and the Plan (the “RSU Award”). Each RSU represents the right to receive one Share. Prior to actual issuance of any Shares, the RSUs and the RSU Award represent an unsecured obligation of the Corporation, payable only from the general assets of the Corporation.

(i)The RSUs are intended to constitute an “employment inducement” award NASDAQ Listing Rule 5635(c)(4), and consequently are intended to be exempt from the NASDAQ rules regarding shareholder approval of stock option and stock purchase plans or other equity compensation arrangements. This Agreement and the terms and conditions of the RSUs shall be interpreted in accordance and consistent with such exemption.

(b)Vesting. The RSUs subject to the RSU Award shall vest in accordance with the Vesting Schedule set forth in the Grant Notice. Unless and until the RSUs have vested in accordance with the vesting schedule set forth in the Grant Notice, Participant will have no right to any distribution with respect to such RSUs. In the event of Participant’s cessation of Service for any reason, including as a result of Participant’s death or Permanent Disability, prior to the vesting of all of the RSUs, any unvested RSUs will terminate automatically without any further action by the Corporation and be forfeited without further notice and at no cost to the Corporation.

(c)Distribution of Stock.

(ii)Stock shall be distributed to Participant (or in the event of Participant’s death, to his or her estate) with respect to such Participant’s vested RSUs granted to Participant pursuant to this Restricted Stock Unit Agreement, subject to the terms and provisions of the Plan and this Restricted Stock Unit Agreement, within ten (10) days following each vesting date as the RSU vests pursuant to the Vesting Schedule set forth in the Grant Notice.

(iii)All distributions shall be made by the Corporation in the form of whole shares of Stock. In no event will fractional shares be issued upon settlement of the RSU Award. No fractional Shares shall be issued and any such fractional Shares shall be cancelled automatically and without any further action by Participant or the Corporation.

(iv)Notwithstanding the foregoing, shares of Stock shall be issuable pursuant to an RSU at such times and upon such events as are specified in this Agreement only to the extent issuance under such terms will not cause the RSUs or the shares of Stock issuable pursuant to the RSUs to be includible in the gross income of Participant under Section 409A of the Code prior to such times or the occurrence of such events, as permitted by the Code and the regulations and other guidance thereunder.

(a)Generally. Stock issued under the RSU Award shall be issued to Participant or Participant’s beneficiaries, as the case may be, at the sole discretion of the Plan Administrator, in either (i) uncertificated form, with the Shares recorded in the name of Participant in the books and records of the Corporation’s transfer agent with appropriate notations regarding the restrictions on transfer imposed pursuant to this Agreement; or (ii) certificate form.

1.2Taxation Representations; Tax Withholding. Notwithstanding any other provision of this Agreement (including, without limitation, Section 1.1(b) hereof):

(d)Taxation Representations. Participant has reviewed with his or her own tax advisors the federal, state, local and foreign tax consequences of this investment and the transactions contemplated by this Agreement. Participant is relying solely on such advisors and not on any statements or representations of the Corporation or any of its agents. Participant understands that Participant (and not the Corporation) shall be responsible for his or her own tax liability that may arise as a result of this investment or the transactions contemplated by this Agreement.

(e)Tax Withholding Obligation. The Corporation shall not be obligated to deliver any certificate representing Shares issuable with respect to the RSUs to Participant or his or her legal representative unless and until Participant or his or her legal representative shall have paid or otherwise satisfied in full the amount of all federal, state, local and foreign taxes applicable with respect to the taxable income of Participant resulting from the vesting of the RSUs, the distribution of the Shares issuable with respect thereto, or any other taxable event related to the RSUs (the “Tax Withholding Obligation”), provided that no payment shall be delayed under this Section 1.2(b) if such delay will result in a violation of Section 409A of the Code. To the maximum extent permitted by applicable law, the Corporation and its Subsidiaries have the authority to deduct or withhold, or require Participant to remit to the Corporation or the applicable Subsidiary, an amount sufficient to satisfy the Tax Withholding Obligation.

(f)Withholding of Shares. With respect to any Tax Withholding Obligation arising in connection with the RSUs, the Corporation shall automatically withhold a net number of vested Shares otherwise issuable pursuant to the RSUs having a then current Fair Market Value not exceeding the amount necessary to satisfy the Tax Withholding Obligation of the Corporation and its Subsidiaries based on the minimum applicable 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 be determined by the Plan Administrator, which higher rate 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 that such Shares shall be rounded up to the nearest whole Share sufficient to cover the Tax Withholding Obligation 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.

(d)    Broker Sale. In the event any Tax Withholding Obligation arising in connection with the RSUs will be satisfied under Section 1.2(c), then the Corporation may, upon approval of the Plan Administrator, elect to instruct any brokerage firm determined acceptable to the Corporation for such purpose to sell on Participant's behalf a whole number of shares from those Shares then issuable to Participant pursuant to the RSUs as the Corporation determines to be appropriate to generate cash proceeds sufficient to satisfy the Tax Withholding Obligation and to remit the proceeds of such sale to the Corporation or the Subsidiary with respect to which the Tax Withholding Obligation arises. Participant’s acceptance of this Award constitutes Participant's instruction and authorization to the Corporation and such brokerage firm to complete the transactions described in this Section 1.2(d), including the transactions described in the previous sentence, as applicable.

(e)    Participant Liable for Taxes. Participant is ultimately liable and responsible for all taxes owed in connection with the RSUs, regardless of any action the Corporation or any Subsidiary takes with respect to any Tax Withholding Obligations that arise in connection with the RSUs. Neither the Corporation nor any Subsidiary makes any representation or undertaking regarding the treatment of any Tax Withholding Obligation in connection with the awarding, vesting or payment of the RSUs or the subsequent sale of Shares. The Corporation and the Subsidiaries do not commit and are under no obligation to structure the RSUs to reduce or eliminate Participant’s tax liability.

1.3Conditions to Issuance of Certificates The Corporation shall not be required to issue or deliver any certificate or certificates for any Shares prior to the fulfillment of all of the following conditions: (a) the admission of the Shares to listing on all stock exchanges on which such Shares are then listed; (b) the completion of any registration or other qualification of the Shares under any state or federal law or under rulings or regulations of the U.S. Securities and Exchange Commission or other governmental regulatory body, which the Plan Administrator shall, in its sole and absolute discretion, deem necessary and advisable; (c) the obtaining of any approval or other clearance from any state or federal governmental agency that the Plan Administrator shall, in its absolute discretion, determine to be necessary or advisable; and (d) the lapse of any such reasonable period of time following the date the RSUs vest as the Plan Administrator may from time to time establish for reasons of administrative convenience.

1.4RSU Award and Interests Not Transferable. This RSU Award and the rights and privileges conferred hereby, including the RSUs awarded hereunder, shall not be liable for the debts, contracts or engagements of Participant or his successors in interest or shall be subject to disposition by transfer, alienation, anticipation, pledge, encumbrance, assignment or any other means whether such disposition be voluntary or involuntary or by operation of law by judgment, levy, attachment, garnishment or any other legal or equitable proceedings (including bankruptcy), and any attempted disposition thereof shall be null and void and of no effect.

1.5Rights as Shareholder. Neither the Participant nor any person claiming under or through the Participant shall have any of the rights or privileges of a shareholder of the Corporation in respect of any Shares issuable hereunder unless and until certificates representing such Shares (which may be in uncertificated form) will have been issued and recorded on the books and records of the Corporation or its transfer agents or registrars, and delivered to the Participant (including through electronic delivery to a brokerage account). After such issuance, recordation and delivery, the Participant shall have all the rights of a shareholder of the Corporation, including with respect to the right to vote the Shares and the right to receive any cash or share dividends or other distributions paid to or made with respect to the Shares; provided, however, that at the discretion of the Corporation, and prior to the delivery of Shares, Participant may be required to execute a shareholders agreement in such form as shall be determined by the Corporation.

1.6No Right to Continued Service. Nothing in the Plan or in this Agreement shall be interpreted to interfere with or limit in any way the right of the Corporation or any Parent or Subsidiary to terminate Participant’s employment at any time, nor confer upon Participant the right to continue in the employ of the Corporation or any Parent or Subsidiary.

1.7Governing Law. This Agreement and all acts and transactions pursuant hereto and the rights and obligations of the parties hereto shall be governed, construed and interpreted in accordance with the laws of the State of California, without giving effect to principles of conflicts of law.

1.8Conformity to Securities Laws. Participant acknowledges that the Plan is intended to conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission thereunder, and state securities laws and regulations. Notwithstanding anything herein to the contrary, the Plan shall be

administered, and the Shares are to be issued, only in such a manner as to conform to such laws, rules and regulations. To the extent permitted by applicable law, the Plan and this Agreement shall be deemed amended to the extent necessary to conform to such laws, rules and regulations.

1.9Notices. Any notice required or permitted by this Agreement shall be in writing and shall be deemed sufficient when delivered personally or sent by electronic mail (with return receipt requested and received) or fax or forty-eight (48) hours after being deposited in the U.S. mail, as certified or registered mail, with postage prepaid, and addressed to the party to be notified, if to the Corporation, at its principal offices, and if to Participant, at Participant’s address, electronic mail address or fax number in the Corporation’s employee records or as subsequently modified by written notice.

1.10Counterparts. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original and all of which together shall constitute one instrument.

1.11Severability. If one or more provisions of this Agreement are held to be unenforceable under applicable law, the parties agree to renegotiate such provision in good faith. In the event that the parties cannot reach a mutually agreeable and enforceable replacement for such provision, then (a) such provision shall be excluded from this Agreement, (b) the balance of the Agreement shall be interpreted as if such provision were so excluded and (c) the balance of the Agreement shall be enforceable in accordance with its terms.

1.12Entire Agreement; Enforcement of Rights. This Agreement and the Plan set forth the entire agreement and understanding of the parties relating to the subject matter herein and merge all prior discussions between them. No modification of or amendment to this Agreement, nor any waiver of any rights under this Agreement, shall be effective unless in writing signed by the parties to this Agreement.

1.13Successors and Assigns. The rights and benefits of this Agreement shall inure to the benefit of, and be enforceable by the Corporation’s successors and assigns. The Corporation may assign its rights under this Agreement to any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Corporation without the prior written consent of Participant. The rights and obligations of Participant under this Agreement may only be assigned with the prior written consent of the Corporation.

1.14Section 409A. This RSU Award is not intended to constitute “nonqualified deferred compensation” within the meaning of Section 409A of the Code (together with any 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 date hereof, “Section 409A”), and, accordingly, the Shares issuable pursuant to the RSUs hereunder shall be distributed to Participant no later than the later of: (i) the fifteenth (15th) day of the third month following Participant’s first taxable year in which such RSUs are no longer subject to a substantial risk of forfeiture, and (ii) the fifteenth (15th) day of the third month following first taxable year of the Corporation in which such RSUs are no longer subject to substantial risk of forfeiture, as determined in accordance with Section 409A and any Treasury Regulations and other guidance issued thereunder. For purposes of Section 409A (including, without limitation, for purposes of Treasury Regulation Section 1.409A-2(b)(2)(iii)), each payment that Participant may be eligible to receive under this Agreement shall be treated as a separate and distinct payment.

1.15Broker-Assisted Sales. In the event of any broker-assisted sale of Shares in connection with the payment of any Tax Withholding Obligation as provided in Section 1.2(c): (a) any Shares to be sold through a broker-assisted sale will be sold on the day the Tax Withholding Obligation arises or as soon thereafter as practicable; (b) such Shares may be sold as part of a block trade with other participants in the Plan in which all participants receive an average price; (c) Participant will be responsible for all broker’s fees and other costs of sale, and Participant agrees to indemnify and hold the Corporation harmless from any losses, costs, damages, or expenses relating to any such sale; (d) to the extent the proceeds of such sale exceed the applicable Tax Withholding Obligation, the Corporation agrees to pay such excess in cash to Participant as soon as reasonably practicable; (e) Participant acknowledges that the Corporation or its designee is under no obligation to arrange for such sale at any particular price, and that the proceeds of any such sale may not be sufficient to satisfy the applicable Tax Withholding Obligation;

and (f) in the event the proceeds of such sale are insufficient to satisfy the applicable Tax Withholding Obligation, Participant agrees to pay immediately upon demand to the Corporation or its Subsidiary with respect to which the Tax Withholding Obligation arises an amount in cash sufficient to satisfy any remaining portion of the Corporation’s or the applicable Subsidiary’s Tax Withholding Obligation.

1.16Paperless Administration. By accepting this RSU Award, Participant hereby agrees to receive documentation related to the RSU Award by electronic delivery, such as a system using an internet website or interactive voice response, maintained by the Corporation or a third party designated by the Corporation.