Solid Biosciences (SLDB) COO logs RSU vesting and tax-related share sale

Rhea-AI Filing Summary

Solid Biosciences Chief Operating Officer David T. Howton reported routine equity activity involving restricted stock units and related share sales. On February 13, 2026, RSUs granted on February 13, 2024 vested, resulting in the acquisition of 14,687 shares of common stock through a derivative conversion at a price of $0.00 per share. A corresponding RSU position of 14,687 units was reduced, leaving 29,376 RSUs outstanding. On February 18, 2026, 7,469 common shares were sold in the open market at a weighted average price of $5.8233 per share to cover withholding taxes following this vesting, under a durable automatic sales instruction adopted on August 16, 2024, so the sale was not a discretionary trade. After these transactions, Howton held 105,077 shares of common stock directly.

Insider Trade Summary

Net Seller: 7,469 shares ($43,494)

Net Sell 3 txns

Insider Howton David T

Role Chief Operating Officer

Sold 7,469 shs ($43K)

Type	Security	Shares	Price	Value
Sale	Common Stock	7,469	$5.8233	$43K
Exercise	Restricted Stock Units	14,687	$0.00	--
Exercise	Common Stock	14,687	$0.00	--

Holdings After Transaction: Common Stock — 105,077 shares (Direct); Restricted Stock Units — 29,376 shares (Direct)

Footnotes (1)

1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "RSUs"). This sale was made to cover withholding taxes following the vesting of the previously granted RSUs pursuant to a durable automatic sales instruction letter adopted by Mr. Howton on August 16, 2024 effecting the sell-to-cover election. The sale does not represent a discretionary trade by Mr. Howton. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.23 to $6.14, 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 sold at each separate price within the range set forth in footnote (4) to this Form. The RSUs were granted on February 13, 2024 (the "Grant Date") and vest over four years, with 25% of the original number of shares vesting on each anniversary of the Grant Date until the fourth such anniversary.

Form 4 Insider Transactions: What Each Field Means →

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

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

X

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^*

Howton David T

(Last) (First) (Middle)

C/O SOLID BIOSCIENCES INC.

500 RUTHERFORD AVENUE, THIRD FLOOR

(Street)

CHARLESTOWN MA 02129

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/13/2026

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

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

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

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	02/13/2026		M		14,687	A	(1)	112,546	D
Common Stock	02/18/2026		S		7,469(2)	D	$5.8233(3)	105,077	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)	02/13/2026		M			14,687	(4)	(4)	Common Stock	14,687	$0.00	29,376	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock (the "RSUs").

2. This sale was made to cover withholding taxes following the vesting of the previously granted RSUs pursuant to a durable automatic sales instruction letter adopted by Mr. Howton on August 16, 2024 effecting the sell-to-cover election. The sale does not represent a discretionary trade by Mr. Howton.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.23 to $6.14, 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 sold at each separate price within the range set forth in footnote (4) to this Form.

4. The RSUs were granted on February 13, 2024 (the "Grant Date") and vest over four years, with 25% of the original number of shares vesting on each anniversary of the Grant Date until the fourth such anniversary.

	/s/ Kimberly Cornwell as attorney-in-fact for David Tyronne Howton	02/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions did Solid Biosciences (SLDB) report for David T. Howton?

Solid Biosciences reported that COO David T. Howton acquired 14,687 shares through RSU vesting and sold 7,469 common shares. The sale covered tax withholding obligations tied to the RSU vesting under a pre-established automatic sales instruction.

How many Solid Biosciences (SLDB) shares did the COO sell and at what price?

David T. Howton sold 7,469 shares of Solid Biosciences common stock at a weighted average price of $5.8233 per share. The sale occurred in multiple trades between $5.23 and $6.14 to satisfy tax withholding obligations.

Were the Solid Biosciences (SLDB) insider sales by the COO discretionary trades?

The reported sale was not a discretionary trade by the COO. It was executed to cover withholding taxes after RSU vesting, under a durable automatic sales instruction letter adopted on August 16, 2024, effecting a sell-to-cover election.

What RSU activity did Solid Biosciences (SLDB) disclose for its COO?

The company disclosed that RSUs granted on February 13, 2024 vested, converting 14,687 RSUs into the same number of common shares at $0.00 per share. The award vests over four years, with 25% vesting on each anniversary of the grant date.

How many Solid Biosciences (SLDB) shares does the COO hold after these transactions?

Following the reported transactions, COO David T. Howton directly holds 105,077 shares of Solid Biosciences common stock. He also holds 29,376 restricted stock units, each representing a contingent right to receive one share of common stock.

Why did Solid Biosciences (SLDB) COO sell shares after RSU vesting?

The COO sold shares solely to cover tax withholding obligations triggered by RSU vesting. The sale followed a durable automatic sales instruction implementing a sell-to-cover election, meaning it was an automatic mechanism rather than a discretionary portfolio decision.