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APPENDIX A REGULUS THERAPEUTICS INC. 2019 EQUITY INCENTIVE PLAN ADOPTED BY THE BOARD OF DIRECTORS: JUNE 15, 2019 APPROVED BY THE STOCKHOLDERS: AUGUST 1, 2019 AMENDED BY THE BOARD OF DIRECTORS: APRIL 20, 2023 APPROVED BY

Key Takeaway: 2019 EQUITY INCENTIVE PLAN ADOPTED BY THE BOARD OF DIRECTORS: JUNE 15, 2019 APPROVED BY THE STOCKHOLDERS: AUGUST 1, 2019 AMENDED BY THE BOARD OF DIRECTORS: APRIL 20, 2023 APPROVED BY THE STOCKHOLDERS: JUNE 13, 2023 AMENDED BY THE BOARD OF DIRECTORS: APRIL 17, 2024 APPROVED

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2019 EQUITY INCENTIVE PLAN
ADOPTED BY THE BOARD OF DIRECTORS: JUNE 15, 2019
APPROVED BY THE STOCKHOLDERS: AUGUST 1, 2019
AMENDED BY THE BOARD OF DIRECTORS: APRIL 20, 2023
APPROVED BY THE STOCKHOLDERS: JUNE 13, 2023
AMENDED BY THE BOARD OF DIRECTORS: APRIL 17, 2024
APPROVED BY THE STOCKHOLDERS: MAY 16, 2024
Successor to and Continuation of Prior Plan. The Plan is intended as the successor to and continuation of the Regulus Therapeutics Inc. 2012 Equity Incentive Plan, as amended (the 2012 Plan ). From and after 12:01 a.m.
Pacific time on the Effective Date, no additional stock awards will be granted under the 2012 Plan. All Awards granted on or after 12:01 a.m. Pacific Time on the Effective Date will be granted under this Plan. All stock awards granted under the 2012
Plan will remain subject to the terms of the 2012 Plan.
(i) Any shares that would otherwise remain available for future grants
under the 2012 Plan as of 12:01 a.m. Pacific Time on the Effective Date (the 2012 Plan s Available Reserve ) will cease to be available under the 2012 Plan at such time. Instead, that number of shares of Common Stock
equal to the 2012 Plan s Available Reserve will be added to the Share Reserve (as further described in Section 3(a) below) and be then immediately available for grants and issuance pursuant to Stock Awards hereunder, up to the maximum
number set forth in Section 3(a) below.
(ii) In addition, from and after 12:01 a.m. Pacific time on the Effective Date, with
respect to the aggregate number of shares subject, at such time, to outstanding stock awards granted under the 2012 Plan or the Regulus Therapeutics Inc. 2009 Equity Incentive Plan (together with the 2012 Plan, the Prior
Plans ) that (A) expire or terminate for any reason prior to exercise or settlement; (B) are forfeited because of the failure to meet a contingency or condition required to vest such shares or otherwise return to the Company;
or (C) are reacquired, withheld (or not issued) to satisfy a tax withholding obligation in connection with an award or to satisfy the purchase price or exercise price of a stock award (such shares the Returning Shares )
will immediately be added to the Share Reserve (as further described in Section 3(a) below) as and when such a share becomes a Returning Share, up to the maximum number set forth in Section 3(a) below.
(b) Eligible Award Recipients. Employees, Directors and Consultants are eligible to receive Awards.
(c) Available Awards. The Plan provides for the grant of the following Awards: (i) Incentive Stock Options, (ii) Nonstatutory
Stock Options, (iii) Stock Appreciation Rights (iv) Restricted Stock Awards, (v) Restricted Stock Unit Awards, (vi) Performance Stock Awards, (vii) Performance Cash Awards, and (viii) Other Stock Awards.
(d) Purpose. This Plan, through the granting of Awards, is intended to help the Company secure and retain the services of eligible
award recipients, provide incentives for such persons to exert maximum efforts for the success of the Company and any Affiliate, and provide a means by which the eligible recipients may benefit from increases in value of the Common Stock.
Administration by Board. The Board will administer the Plan. The Board may delegate administration of the Plan to a Committee or Committees, as provided in Section 2(c).
(b) Powers of Board. The Board will have the power, subject to, and within the limitations of, the express provisions of the Plan:
(i) To determine: (A) who will be granted Awards; (B) when and how each Award will be granted; (C) what type of Award
will be granted; (D) the provisions of each Award (which need not be identical), including when a person will be permitted to exercise or otherwise receive cash or Common Stock under the Award; (E) the number of shares of Common Stock
subject to, or the cash value of, an Award; and (F) the Fair Market Value applicable to a Stock Award.
(ii) To construe and interpret the Plan and Awards granted under it, and to
establish, amend and revoke rules and regulations for administration of the Plan and Awards. The Board, in the exercise of these powers, may correct any defect, omission or inconsistency in the Plan or in any Award Agreement or in the written terms
of a Performance Cash Award, in a manner and to the extent it will deem necessary or expedient to make the Plan or Award fully effective.
(iii) To settle all controversies regarding the Plan and Awards granted under it.
(iv) To accelerate, in whole or in part, the time at which an Award may be exercised or vest (or at which cash or shares of Common
Stock may be issued).
(v) To suspend or terminate the Plan at any time. Except as otherwise provided in the Plan or an Award
Agreement, suspension or termination of the Plan will not materially impair a Participant s rights under his or her then-outstanding Award without his or her written consent except as provided in subsection (viii) below.
(vi) To amend the Plan in any respect the Board deems necessary or advisable, including, without limitation, by adopting amendments
relating to Incentive Stock Options and certain nonqualified deferred compensation under Section 409A of the Code and/or to bring the Plan or Awards granted under the Plan into compliance with the requirements for Incentive Stock Options or
ensuring that they are exempt from or compliant with the requirements for nonqualified deferred compensation under Section 409A of the Code, subject to the limitations, if any, of applicable law. If required by applicable law or listing
requirements, and except as provided in Section 9(a) relating to Capitalization Adjustments, the Company will seek stockholder approval of any amendment of the Plan that (A) materially increases the number of shares of Common Stock
available for issuance under the Plan, (B) materially expands the class of individuals eligible to receive Awards under the Plan, (C) materially increases the benefits accruing to Participants under the Plan, (D) materially reduces
the price at which shares of Common Stock may be issued or purchased under the Plan, (E) materially extends the term of the Plan, or (F) materially expands the types of Awards available for issuance under the Plan. Except as otherwise
provided in the Plan or an Award Agreement, no amendment of the Plan will materially impair a Participant s rights under an outstanding Award without the Participant s written consent.
(vii) To submit any amendment to the Plan for stockholder approval, including, but not limited to, amendments to the Plan intended to
satisfy the requirements of (A) Section 422 of the Code regarding incentive stock options or (B) Rule 16b-3.
(viii) To approve forms of Award Agreements for use under the Plan and to amend the terms of any one or more Awards, including, but not
limited to, amendments to provide terms more favorable to the Participant than previously provided in the Award Agreement, subject to any specified limits in the Plan that are not subject to Board discretion; provided however, that a
Participant s rights under any Award will not be impaired by any such amendment unless (A) the Company requests the consent of the affected Participant, and (B) such Participant consents in writing. Notwithstanding the foregoing,
(1) a Participant s rights will not be deemed to have been impaired by any such amendment if the Board, in its sole discretion, determines that the amendment, taken as a whole, does not materially impair the Participant s rights, and
(2) subject to the limitations of applicable law, if any, the Board may amend the terms of any one or more Awards without the affected Participant s consent (I) to maintain the qualified status of the Award as an Incentive Stock
Option under Section 422 of the Code; (II) to change the terms of an Incentive Stock Option, if such change results in impairment of the Award solely because it impairs the qualified status of the Award as an Incentive Stock Option under
Section 422 of the Code; (III) to clarify the manner of exemption from, or to bring the Award into compliance with, Section 409A of the Code; or (IV) to comply with other applicable laws or listing requirements.
(ix) Generally, to exercise such powers and to perform such acts as the Board deems necessary or expedient to promote the best
interests of the Company and that are not in conflict with the provisions of the Plan or Awards.
(x) To adopt such procedures and sub-plans as are necessary or appropriate to permit participation in the Plan by Employees, Directors or Consultants who are foreign nationals or employed outside the United States (provided that Board approval will
not be necessary for immaterial modifications to the Plan or any Award Agreement that are required for compliance with the laws of the relevant foreign jurisdiction).
(c) Delegation to Committee.
(i) General. The Board may delegate some or all of the administration of the Plan to a Committee or Committees. If administration of the
Plan is delegated to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the Board that have been delegated to the Committee, including the power to delegate to a subcommittee
of the Committee any of the administrative powers the Committee is authorized to exercise (and references in this Plan to the Board will thereafter be to the Committee or subcommittee, as applicable). Any delegation of administrative powers will be
reflected in resolutions, not inconsistent with the provisions of the Plan, adopted from time to time by the Board or Committee (as applicable). The Board may retain the authority to concurrently administer the Plan with the Committee and may, at
any time, revest in the Board some or all of the powers previously delegated.
(ii) Rule 16b-3 Compliance. The Committee may
consist solely of two or more Non-Employee Directors, in accordance with Rule 16b-3.
(d) Delegation to Other Person or Body. The Board or any Committee may delegate to one or more persons or bodies the authority to do
one or more of the following to the extent permitted by applicable law: (i) designate recipients, other than Officers, of Stock Awards, provided that no person or body may be delegated authority to grant a Stock Award to themself;
(ii) determine the number of shares of Common Stock subject to such Stock Awards; and (iii) determine the terms of such Stock Awards; provided, however, that the Board or Committee action regarding such delegation will fix the terms
of such delegation in accordance with applicable law, including without limitation Sections 152 and 157 of the Delaware General Corporation Law. Unless provided otherwise in the Board or Committee action regarding such delegation, each Stock Award
granted pursuant to this section will be granted on the applicable form of Stock Award Agreement most recently approved for use by the Board or the Committee, with any modifications necessary to incorporate or reflect the terms of such Stock Award.
Notwithstanding anything to the contrary herein, neither the Board nor any Committee may delegate to any person or body (who is not a Director or that is not comprised solely of Directors, respectively) the authority to determine the Fair Market
Value pursuant to Section 13(x)(iii) below.
(e) Effect of Board s Decision. All determinations, interpretations and
constructions made by the Board in good faith will not be subject to review by any person and will be final, binding and conclusive on all persons.
(f) Cancellation and Re-Grant of Stock Awards. Neither the Board nor any Committee will have
the authority to: (i) reduce the exercise price or strike price of any outstanding Options or Stock Appreciation Rights under the Plan, or (ii) cancel any outstanding Options or Stock Appreciation Rights that have an exercise price or
strike price greater than the current Fair Market Value of the Common Stock in exchange for cash or other Stock Awards under the Plan, unless the stockholders of the Company have approved such an action within twelve months prior to such an event.
3. SHARES SUBJECT TO THE PLAN.
Subject to Section 9(a) relating to Capitalization Adjustments and Section 3(a)(ii) regarding automatic increases, the aggregate number of shares of Common Stock that may be issued pursuant to Stock Awards will not exceed 18,574,542
shares (the Share Reserve ), which number is the sum of (A) 272,577 shares that were approved at the Company s 2019 Annual Meeting of Stockholders, plus (B) an additional 416,686 shares that became available
upon the Milestone Closing, plus (C) an additional 5,000,000 shares that were approved at the Company s 2023 Annual Meeting of Stockholders, plus (D) 2,920,164 cumulative shares available as a result of automatic increases
under the terms of this Plan on January 1, 2021, January 1, 2022, January 1, 2023 and January 1, 2024, plus (E) an additional 9,500,000 shares that were approved at the Company s 2024 Annual Meeting of
Stockholders, plus (F) the number of shares subject to the 2012 Plan s Available Reserve, plus (G) the number of shares that are Returning Shares, as such shares become available from time to time.
(ii) In addition, the Share Reserve will automatically increase on January 1st of each year, commencing on January 1, 2025 and
ending on (and including) January 1, 2029, in an amount equal to 5.0% of the sum of (A) total number of shares of Capital Stock outstanding on December 31st of the preceding calendar year, plus (B) the total number of shares of
Capital Stock issuable upon conversion of shares of Convertible Preferred Stock outstanding on December 31st of the preceding calendar year (without regard to any beneficial ownership limitations applicable thereto), plus (C) the total
number of shares of Capital Stock issuable upon cash exercise of Prefunded Warrants outstanding on December 31st of the preceding calendar year (without regard to any beneficial ownership limitations applicable thereto). Notwithstanding the
foregoing, the Board may act prior to January 1st of a given year to provide that there will be no January 1st increase in the Share Reserve for such year or that the increase in the Share Reserve for such year will be a lesser number of shares of
Common Stock than would otherwise occur pursuant to the preceding sentence.
(iii) For clarity, the Share Reserve in this
Section 3(a) is a limitation on the number of shares of Common Stock that may be issued pursuant to the Plan. Accordingly, this Section 3(a) does not limit the granting of Stock Awards except as provided in Section 7(a). Shares may be
issued in connection with a merger or acquisition as permitted by NASDAQ Listing Rule 5635(c) or, if applicable, NYSE Listed Company Manual Section 303A.08, NYSE American Company Guide Section 711 or other applicable rule, and such
issuance will not reduce the number of shares available for issuance under the Plan.
(b) Reversion of Shares to the Share Reserve.
If a Stock Award or any portion thereof (i) expires or otherwise terminates without all of the shares covered by such Stock Award having been issued or (ii) is settled in cash (i.e., the Participant receives cash rather than
stock), such expiration, termination or settlement will not reduce (or otherwise offset) the number of shares of Common Stock that may be available for issuance under the Plan. If any shares of Common Stock issued pursuant to a Stock Award are
forfeited back to or repurchased by the Company because of the failure to meet a contingency or condition required to vest such shares in the Participant, then the shares that are forfeited or repurchased will revert to and again become available
for issuance under the Plan. Any shares reacquired by the Company in satisfaction of tax withholding obligations on a Stock Award or as consideration for the exercise or purchase price of a Stock Award will again become available for issuance under
(c) Incentive Stock Option Limit. Subject to the provisions of Section 9(a)
relating to Capitalization Adjustments, the aggregate maximum number of shares of Common Stock that may be issued pursuant to the exercise of Incentive Stock Options will be 55,000,000 shares of Common Stock.
Last updated: May 17, 2024