Solid Biosciences director converts grant to 3,440 shares

The director held 141,585 common shares directly after the one-for-one conversion of restricted stock units.

Rhea-AI Filing Summary

Solid Biosciences Inc. director Ian F. Smith converted 3,440 restricted stock units into 3,440 shares of common stock on October 2, 2026. The units convert one-for-one; after the transaction, Smith held 141,585 common shares directly. The units were granted January 2, 2026 and vested in equal quarterly installments beginning three months after the grant, with the final installment vesting 12 months after the grant.

Insider Trade Summary

3,440 shares exercised/converted

Exercise 2 txns

Insider SMITH IAN F

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units F1, F2	3,440	$0.00	$0.00
Exercise	Common Stock F1	3,440	--	--

Holdings After Transaction: Restricted Stock Units — 3,440 contracts (Direct); Common Stock — 141,585 shares (Direct)

Footnotes (2)

1. F1. Restricted stock units convert to common stock on a one-for-one basis.
2. F2. The restricted stock units were granted on January 2, 2026 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.

Key Figures

Restricted stock units converted: 3,440 units Common shares acquired: 3,440 shares Direct common shares after transaction: 141,585 shares +2 more

5 metrics

Restricted stock units converted 3,440 units October 2, 2026

Common shares acquired 3,440 shares On conversion of the restricted stock units, October 2, 2026

Direct common shares after transaction 141,585 shares Ian F. Smith's reported holdings after the transaction

Conversion ratio One common share per restricted stock unit Restricted stock units convert to common stock on a one-for-one basis

Final vesting installment 12 months from grant The units were granted January 2, 2026

Key Terms

Restricted Stock Units, one-for-one basis, quarterly installments

3 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

one-for-one basis financial

"convert to common stock on a one-for-one basis"

quarterly installments financial

"vested in equal quarterly installments"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many SLDB shares did Ian F. Smith acquire?

Ian F. Smith acquired 3,440 shares of common stock by converting 3,440 restricted stock units on October 2, 2026.

How did Ian F. Smith's SLDB restricted stock units vest?

The units were granted on January 2, 2026 and vested in equal quarterly installments beginning three months after the grant, with the final installment vesting 12 months after the grant.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/06/2026 - 04:36 PM Accepted by SEC EDGAR 10/06/2026 - 04:35 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SMITH IAN F

(Last) (First) (Middle)

C/O SOLID BIOSCIENCES INC.

500 RUTHERFORD AVENUE, THIRD FLOOR

(Street)

CHARLESTOWN MASSACHUSETTS 02129

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Solid Biosciences Inc. [ SLDB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/02/2026		M		3,440	A	(1)	141,585	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	10/02/2026		M			3,440	(2)	(2)	Common Stock	3,440	$0.00	3,440	D

Explanation of Responses:

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

2. The restricted stock units were granted on January 2, 2026 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.

	/s/ Kimberly Cornwell as attorney-in-fact for Ian F. Smith	10/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)