Stein Jeffrey

SEC source: 0001610717-26-000264 · form4.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Common Stock · 20,000 shares

Expires 2036-06-16

F1 · derivative.exercise_date: 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

SEC source: 0001610717-26-000078 · form4.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,281

F1 · price: This transaction was executed in multiple trades in prices ranging from $32.743 to $33.1999, inclusive. The price reported in Column 4 above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares purchased at each respective price within the range set forth in this footnote.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 14

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 275,000 shares

Expires 2035-03-30

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 13

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 560,888 shares

Expires 2034-09-29

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 12

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 51,999 shares

Expires 2034-03-14

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 11

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 27,174 shares

Expires 2033-03-26

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 10

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 16,499 shares

Expires 2032-03-30

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 9

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 26,249 shares

Expires 2031-03-16

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 8

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 16,499 shares

Expires 2030-03-18

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 7

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,249 shares

Expires 2029-03-20

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 6

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,749 shares

Expires 2028-03-28

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 5

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,000 shares

Expires 2027-03-30

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · derivative · entry 4

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,949 shares

Expires 2026-03-15

F4 · derivative.exercise_price: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F4 · shares: The exercise price and the number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

F5 · price: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

F5 · derivative.exercise_date: As of immediately prior to and contingent upon the occurrence of the effective time of the Merger, pursuant to the Merger Agreement, each outstanding option became fully vested and exercisable, and to the extent outstanding and unexercised as of immediately before the effective time of the Merger, was cancelled at the effective time of the Merger and converted into the right to receive cash, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Common Shares subject to such option immediately prior to the effective time of the Merger multiplied by (ii) the excess of (x) $221.50 per Common Share over (y) the exercise price payable per Common Share under such option.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · nonDerivative · entry 3

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 0

F1 · kind: Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated November 13, 2025, by and among Cidara Therapeutics, Inc. (the "Issuer"), Merck Sharp & Dohme LLC ("Merck") and Caymus Purchaser, Inc., a wholly owned subsidiary of Merck ("Purchaser"), on January 7, 2026, Purchaser completed a tender offer to acquire (i) all outstanding shares of common stock of the Issuer, par value $0.0001 per share (each, a "Common Share") and (ii) all outstanding shares of Series A Convertible Voting Preferred Stock of the Issuer, par value $0.0001 per share (each, a "Series A Share"), and thereafter merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Merck (the "Merger"). [continues to Footnote 2]

F2 · kind: [continues from Footnote 1] Pursuant to the terms of the Merger Agreement, Common Shares and Series A Shares were tendered and disposed of at the Offer Acceptance Time (as defined in the Merger Agreement) in exchange for the right to receive (i) $221.50 per Common Share (the "Common Share Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes, and (ii) $15,505.00 per Series A Share (the "Series A Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes. [continues to Footnote 3]

F3 · kind: [continues from Footnote 2] At the effective time of the Merger, each issued and outstanding Common Share and Series A Share (other than Common Shares (a) held by the Issuer (or in the Issuer's treasury), Merck, Purchaser, any other direct or indirect wholly owned subsidiary of Merck or the Issuer, or by stockholders of the Issuer who have properly exercised and perfected their statutory rights of appraisal, or (b) irrevocably accepted for purchase in the tender offer) was automatically canceled and converted into the right to receive the Common Share Merger Consideration and the Series A Merger Consideration, respectively, without interest and subject to any applicable withholding of taxes.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · nonDerivative · entry 2

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By son

Disclosed balance after: 0

F1 · kind: Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated November 13, 2025, by and among Cidara Therapeutics, Inc. (the "Issuer"), Merck Sharp & Dohme LLC ("Merck") and Caymus Purchaser, Inc., a wholly owned subsidiary of Merck ("Purchaser"), on January 7, 2026, Purchaser completed a tender offer to acquire (i) all outstanding shares of common stock of the Issuer, par value $0.0001 per share (each, a "Common Share") and (ii) all outstanding shares of Series A Convertible Voting Preferred Stock of the Issuer, par value $0.0001 per share (each, a "Series A Share"), and thereafter merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Merck (the "Merger"). [continues to Footnote 2]

F2 · kind: [continues from Footnote 1] Pursuant to the terms of the Merger Agreement, Common Shares and Series A Shares were tendered and disposed of at the Offer Acceptance Time (as defined in the Merger Agreement) in exchange for the right to receive (i) $221.50 per Common Share (the "Common Share Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes, and (ii) $15,505.00 per Series A Share (the "Series A Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes. [continues to Footnote 3]

F3 · kind: [continues from Footnote 2] At the effective time of the Merger, each issued and outstanding Common Share and Series A Share (other than Common Shares (a) held by the Issuer (or in the Issuer's treasury), Merck, Purchaser, any other direct or indirect wholly owned subsidiary of Merck or the Issuer, or by stockholders of the Issuer who have properly exercised and perfected their statutory rights of appraisal, or (b) irrevocably accepted for purchase in the tender offer) was automatically canceled and converted into the right to receive the Common Share Merger Consideration and the Series A Merger Consideration, respectively, without interest and subject to any applicable withholding of taxes.

SEC source: 0001478831-26-000005 · wk-form4_1767835003.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated November 13, 2025, by and among Cidara Therapeutics, Inc. (the "Issuer"), Merck Sharp & Dohme LLC ("Merck") and Caymus Purchaser, Inc., a wholly owned subsidiary of Merck ("Purchaser"), on January 7, 2026, Purchaser completed a tender offer to acquire (i) all outstanding shares of common stock of the Issuer, par value $0.0001 per share (each, a "Common Share") and (ii) all outstanding shares of Series A Convertible Voting Preferred Stock of the Issuer, par value $0.0001 per share (each, a "Series A Share"), and thereafter merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Merck (the "Merger"). [continues to Footnote 2]

F2 · kind: [continues from Footnote 1] Pursuant to the terms of the Merger Agreement, Common Shares and Series A Shares were tendered and disposed of at the Offer Acceptance Time (as defined in the Merger Agreement) in exchange for the right to receive (i) $221.50 per Common Share (the "Common Share Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes, and (ii) $15,505.00 per Series A Share (the "Series A Merger Consideration"), in cash, without interest, subject to any applicable withholding of taxes. [continues to Footnote 3]

F3 · kind: [continues from Footnote 2] At the effective time of the Merger, each issued and outstanding Common Share and Series A Share (other than Common Shares (a) held by the Issuer (or in the Issuer's treasury), Merck, Purchaser, any other direct or indirect wholly owned subsidiary of Merck or the Issuer, or by stockholders of the Issuer who have properly exercised and perfected their statutory rights of appraisal, or (b) irrevocably accepted for purchase in the tender offer) was automatically canceled and converted into the right to receive the Common Share Merger Consideration and the Series A Merger Consideration, respectively, without interest and subject to any applicable withholding of taxes.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 7

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 65,109

F3 · kind: This transaction reflects a bona fide gift of the Issuer's stock to a donor-advised fund (DAF) for charitable purposes. The Reporting Person retains no beneficial ownership or control over the donated securities following the contribution.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 6

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 70,534

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 5

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,295

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

F2 · balance_after: Includes 50 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan (ESPP) on December 18, 2025.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 4

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 59,896

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 3

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,883

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

SEC source: 0001610618-25-000104 · wk-form4_1765586582.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,199

F1 · shares: Shares withheld for taxes on RSU vesting.

F2 · balance_after: Includes 600 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan (ESPP), representing 200 shares purchased on each of the following dates: November 20, 2024; May 20, 2025; and November 20, 2025.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 2

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 57,652

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

SEC source: 0001478831-25-000004 · wk-form4_1767049451.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,127

F1 · kind: Gift transfer of shares from Reporting Person to trust for no consideration.

SEC source: 0001610717-25-000264 · form4.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,000

Underlying: Common Stock · 20,000 shares

Expires 2035-06-24

F1 · derivative.exercise_date: 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

SEC source: 0001610618-25-000028 · wk-form4_1743632888.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 275,000

Underlying: Common Stock · 275,000 shares

Expires 2035-03-30

F1 · derivative.exercise_date: The option shall vest and become exercisable in a series of thirty-six (36) successive equal monthly installments measured from the Vesting Commencement Date of March 31, 2025.

SEC source: 0001610618-24-000133 · wk-form4_1727904303.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 560,888

Underlying: Common Stock · 560,888 shares

Expires 2034-09-29

F1 · derivative.exercise_date: The option shall vest and become exercisable in a series of thirty-six (36) successive equal monthly installments measured from the Vesting Commencement Date of September 30, 2024.

SEC source: 0001628280-24-027720 · wk-form4_1718144781.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 24,580

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.05 to $13.29, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F2 · balance_after: The number of securities reported herein have been adjusted to reflect the 1-for-20 reverse stock split effected by the Issuer on April 24, 2024.

SEC source: 0001610717-24-000276 · form4.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,200

Underlying: Common Stock · 16,200 shares

Expires 2034-05-30

F1 · derivative.exercise_date: 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

SEC source: 0001610618-24-000023 · wk-form4_1710974788.xml · derivative · entry 4

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,040,000

Underlying: Common Stock · 1,040,000 shares

Expires 2034-03-14

F1 · derivative.exercise_date: The option shall vest and become exercisable in a series of thirty-six (36) successive equal monthly installments measured from the Vesting Commencement Date of March 15, 2024.

SEC source: 0001610618-24-000017 · wk-form4_1710294500.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,153,693

F1 · shares: Shares withheld for taxes on RSU vesting.

F2 · balance_after: Includes 4,000 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan (ESPP) on November 20, 2023.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 9

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2025-02-03

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 8

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,000 shares

Expires 2026-02-03

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 7

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,000 shares

Expires 2027-02-01

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 6

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,000 shares

Expires 2028-02-14

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 5

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,000 shares

Expires 2029-02-26

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 4

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,000 shares

Expires 2030-02-19

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · derivative · entry 3

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,000 shares

Expires 2031-02-18

F5 · price: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

F5 · derivative.exercise_date: Pursuant to the Merger Agreement, at the Effective Time, each option to purchase shares of Company Common Stock granted under an Issuer equity plan (each, a "Company Stock Option") that was then outstanding that has an exercise price per share of Company Common Stock that is greater than $3.00 was cancelled for no consideration.

SEC source: 0000899243-23-019362 · doc4.xml · nonDerivative · entry 2

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · price: Pursuant to the Merger Agreement, at the Effective Time, each restricted stock unit award covering shares of Company Common Stock that is subject to vesting conditions based solely on continued employment or service granted under an Issuer equity plan (each, a "Company RSU") and each performance stock unit award covering shares of Company Common Stock that are subject to performance-based vesting conditions granted under an Issuer equity plan (each, a "Company PSU") (the Company RSUs and the Company PSUs, collectively "Company Equity Awards") that was then outstanding was cancelled, and the holder of such cancelled Company Equity Award is entitled, in exchange therefor, to receive (without interest and less applicable tax withholdings) (i) an amount in cash equal to the product of (A) the total number of shares of Company Common Stock subject to (or deliverable under) such Company Equity Award immediately prior to the Effective Time multiplied by (B) the Cash Consideration,

F4 · price: (Continued from Footnote 3) and (ii) a CVR Payment for each share of Company Common Stock subject thereto (the "Equity Award Consideration"), provided, that any payment of the Equity Award Consideration in respect of an unvested Company Equity Award will remain subject to the same vesting conditions as were applicable to such Company Equity Award immediately prior to the Effective Time and shall only become payable to the holder of such cancelled Company Equity Award to the extent such vesting conditions are satisfied following the closing of the Merger.

SEC source: 0000899243-23-019362 · doc4.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,000

F1 · price: This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of June 6, 2023, by and among the Issuer, Resistance Acquisition, Inc. ("Parent"), and Resistance Merger Sub, Inc., a wholly owned subsidiary of Parent ("Merger Sub"), pursuant to which Merger Sub merged with and into Issuer with the Issuer being the surviving corporation (the "Merger").

F2 · price: (Continued from Footnote 1) Pursuant to the Merger Agreement, as of the effective time of the Merger (the "Effective Time"), each issued and outstanding share of common stock of the Issuer ("Company Common Stock") was cancelled and retired and automatically converted into the right to receive (x) $2.15, payable to the holder thereof in cash, without interest (the "Cash Consideration") but subject to reduction for any applicable withholding taxes payable in respect thereof and (y) one (1) contractual contingent value right (a "CVR Payment") that represents the right to receive $0.85 upon satisfaction of certain conditions set forth in a Contingent Value Rights Agreement, dated September 21, 2023, by and between Parent and Equiniti Trust Company, LLC.

SEC source: 0001610618-23-000081 · wf-form4_169153226338307.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 331,602

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.93 to $0.98. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

SEC source: 0001610717-23-000110 · form4.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,200

Underlying: Common Stock · 16,200 shares

Expires 2033-06-06

F1 · derivative.exercise_date: 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

SEC source: 0001610618-23-000026 · wf-form4_167995818336443.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By trust

Disclosed balance after: 281,602

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.015 to $1.0599. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

SEC source: 0001610618-23-000034 · wf-form4_168012541068205.xml · derivative · entry 4

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 543,500

Underlying: Common Stock · 543,500 shares

Expires 2033-03-26

F3 · derivative.exercise_date: The option shall vest and become exercisable in a series of thirty-six (36) successive equal monthly installments measured from the Vesting Commencement Date of March 27, 2023.

SEC source: 0001610618-23-000034 · wf-form4_168012541068205.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,202,385

F1 · shares: Represents time-based Restricted Stock Units (RSUs) granted on March 27, 2023. All RSUs vest in three equal annual installments, with 1/3 vesting on each of March 10, 2024, 2025, and 2026, subject to continuous service through each such vesting date.

F2 · balance_after: Includes 8,000 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan (ESPP) on May 20, 2022 and November 18, 2022.

SEC source: 0000904454-23-000178 · edgar.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,625

F1 · shares: Sale of shares to cover personal income tax obligations upon vesting of restricted stock units, pursuant to a Rule 10b5-1 trading plan.

SEC source: 0000904454-23-000111 · edgar.xml · nonDerivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,625

F1 · shares: Represents restricted stock units granted to the Reporting Person under the Paratek Pharmaceuticals, Inc. 2015 Equity Incentive Plan. Each restricted stock unit represents the contingent right to receive one share of the Issuer's common stock. The restricted stock units shall vest on the one-year anniversary of February 8, 2023, subject to the Reporting Person's continued service with the Issuer through the vesting date.

SEC source: 0001567619-22-012696 · doc1.xml · derivative · entry 1

Stein Jeffrey · CIK 0001478831 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,000

Underlying: Common Stock · 11,000 shares

Expires 2032-06-08

F1 · derivative.exercise_date: 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

SEC source: 0001610618-22-000023 · wf-form4_164910656863339.xml · derivative · entry 6

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 330,000

Underlying: Common Stock · 330,000 shares

Expires 2032-03-30

F4 · derivative.exercise_date: The option shall vest and become exercisable in a series of thirty-six (36) successive equal monthly installments measured from the Vesting Commencement Date of March 31, 2022.

SEC source: 0001610618-22-000023 · wf-form4_164910656863339.xml · nonDerivative · entry 3

Stein Jeffrey · CIK 0001478831 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 922,635

F3 · shares: Shares withheld for taxes on RSU vesting.