Ian F. Smith - 02 Jan 2026 Form 4 Insider Report for Solid Biosciences Inc. (SLDB)

Role: Director
Signature: /s/ David Tyronne Howton as attorney-in-fact for Ian F. Smith
Issuer symbol: SLDB
Transactions as of: 02 Jan 2026
Net transactions value: $0
Form type: 4
Filing time: 07 Jan 2026, 16:05:04 UTC
Previous filing: 14 Oct 2025
Next filing: 19 Feb 2026
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	07 Jan 2026	0001197032

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SLDB	Common Stock	Options Exercise		+4,573	+3.6%		131,264	06 Jan 2026	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	Stock Option (Right to Buy)	Award	$0	+18,012		$0.000000	18,012	02 Jan 2026	Common Stock	18,012	$5.45	Direct	F2
transaction	SLDB	Restricted Stock Units	Award	$0	+13,761		$0.000000	13,761	02 Jan 2026	Common Stock	13,761		Direct	F2, F3
transaction	SLDB	Restricted Stock Units	Options Exercise	$0	-4,573	-100%	$0.000000	0	06 Jan 2026	Common Stock	4,573		Direct	F1, F4

* 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 Smith RSUs (as defined in footnote 3) and this option (together with the Smith RSUs, the "Smith Equity Awards") were granted on January 2, 2026 ("the Grant Date") and vest in equal quarterly installments with the first installment vesting three months from the Grant Date and the final installment vesting date being the date that is 12 months from the Grant Date; provided that in the event of the early termination of the Fourth 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 Smith Equity Awards shall accelerate in full.
F3	Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "Smith RSUs").
F4	The restricted stock units were granted on January 6, 2025 and vested in equal quarterly installments beginning three months from the date of grant, with the final installment vesting 12 months from the date of grant.