Ian F. Smith - Oct 6, 2025 Form 4 Insider Report for Solid Biosciences Inc. (SLDB)

Role: Director
Signature: /s/ David Tyronne Howton as attorney-in-fact for Ian F. Smith
Stock symbol: SLDB
Transactions as of: Oct 6, 2025
Transactions value $: $0
Form type: 4
Date filed: 10/7/2025, 04:05 PM
Previous filing: Jul 8, 2025
Next filing: Oct 14, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SMITH IAN F	Director	C/O SOLID BIOSCIENCES INC., 500 RUTHERFORD AVENUE, THIRD FLOOR, CHARLESTOWN	/s/ David Tyronne Howton as attorney-in-fact for Ian F. Smith	2025-10-07	0001197032

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SLDB	Common Stock	Options Exercise		+4.57K	+3.74%		127K	Oct 6, 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SLDB	Restricted Stock Units	Options Exercise	$0	-4.57K	-50%	$0.00	4.57K	Oct 6, 2025	Common Stock	4.57K		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Restricted stock units convert to common stock on a one-for-one basis.
F2	The restricted stock units were granted on January 6, 2025 (the "Grant Date") and vest in equal quarterly installments beginning three months from the Grant Date, with the final installment vesting the date that is 12 months from the Grant Date; provided that in the event of the early termination of the Third Amendment to Executive Chair Agreement between the Issuer and the reporting person (the "Smith Agreement") prior to the expiration of the Term (as defined in the Smith Agreement) and/or a change in control of the Issuer, the restricted stock units shall accelerate in full.

Content

Restricted stock units convert to common stock on a one-for-one basis.

The restricted stock units were granted on January 6, 2025 (the "Grant Date") and vest in equal quarterly installments beginning three months from the Grant Date, with the final installment vesting the date that is 12 months from the Grant Date; provided that in the event of the early termination of the Third Amendment to Executive Chair Agreement between the Issuer and the reporting person (the "Smith Agreement") prior to the expiration of the Term (as defined in the Smith Agreement) and/or a change in control of the Issuer, the restricted stock units shall accelerate in full.