HOWTON DAVID T (Chief Operating Officer) sold 24.4% of their position (37.77K shares) of SOLID BIOSCIENCES INC. on the open market

Open‑market sale worth $243.1K — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

HOWTON DAVID T

Filed: 2/2/2026ACC: 0001193125-26-034080

InsiderHOWTON DAVID TCIK 1529297

→

IssuerSOLID BIOSCIENCES INC.CIK 1707502

Officer· Chief Operating Officer

Since Feb 2026

+277.53K

Net shares

Net buyer

$243.1K

Total sold

Open market trades

0B · 1S

Total transactions

436.92K acquired · 159.39K disposed

Non-Derivative Transactions3

Common Stock

Direct

M · Option Exercise

+79.34K

Price / share

—

Trade value

—

% of position

241.1%

1/29/2026

32.91K→112.25K

Common Stock

Direct

M · Option Exercise

+42.27K

Price / share

—

Trade value

—

% of position

37.8%

1/31/2026

111.98K→154.25K

Common Stock

Direct

S · Sale

−37.77K

Price / share

$6.44

Trade value

$243.13K

% of position

24.4%

2/2/2026

154.52K→116.75K

Total

Net shares

+83.84K

Net value

-$243.13K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	1/29/2026	M · Option Exercise	+79.34K	—	—	241.1%	32.91K	112.25K
Common Stock Direct	1/31/2026	M · Option Exercise	+42.27K	—	—	37.8%	111.98K	154.25K
Common Stock Direct	2/2/2026	S · Sale	−37.77K	$6.44	$243.13K	24.4%	154.52K	116.75K
Total			+83.84K		-$243.13K

Derivative Transactions4

Performance Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

79.34K shares

−79.34K

Strike price

Held after

0.00

Exercisable

—

1/29/2026

Employee Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

210.20K shares

+210.20K

Strike price

6.60

Held after

210.20K

Exercisable

—

1/29/2026

Restricted Stock Units

Direct

A · Award

Converts to

Common Stock

105.10K shares

+105.10K

Strike price

Held after

105.10K

Exercisable

—

1/29/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

42.27K shares

−42.27K

Strike price

Held after

126.83K

Exercisable

—

1/31/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Performance Stock Units Direct	Common Stock79.34K shares	1/29/2026	M · Option Exercise	−79.34K		—	0.00
Employee Stock Option (Right to Buy) Direct	Common Stock210.20K shares	1/29/2026	A · Award	+210.20K	6.60	—	210.20K
Restricted Stock Units Direct	Common Stock105.10K shares	1/29/2026	A · Award	+105.10K		—	105.10K
Restricted Stock Units Direct	Common Stock42.27K shares	1/31/2026	M · Option Exercise	−42.27K		—	126.83K