Cogent Biosciences, Inc.

COGT· Nasdaq

Since Oct 4, 2025

Transactions: 8
Purchases: 0
Sales: 8
Purchase value: $0.00
Sale value: $383.89M

Values are shares multiplied by reported price when both were supplied, each trade counted once however many filers reported it.

Morris ArleneDirector

4Rule 10b5-1 plan disclosed

Filed Aug 31, 2026Period of report Aug 27, 20260001193125-26-377001

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleAug 27, 2026	Common Stock^F1^F2	42,349	$37.0925	$1.57M	3,161	Direct
SaleAug 27, 2026	Common Stock^F1^F3	3,161	$37.5396	$118.66K

Filing footnotes · 4

F1Transactions effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 28, 2026.
F2The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $36.46 to $37.45. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F3The price reported represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $37.46 to $37.65. Upon request by the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
F4These options are fully vested.

Open on SEC EDGAR

Fairmount Funds Management LLCDirector

Filed Mar 31, 2026Period of report Mar 31, 20260001104659-26-038057

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleMar 31, 2026	Common Stock^F2	7,000,000	$34.66	$242.62M	5,503,418	Indirect

Fairmount Funds Management LLCDirector

Filed Jan 22, 2026Period of report Jan 22, 20260001104659-26-005924

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleJan 22, 2026	Common Stock^F1	3,500,000	$36.40	$127.40M	5,503,418	Indirect

Kearns EvanChief Legal Officer

Filed Dec 30, 2025Period of report Dec 26, 20250001193125-25-337052

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleDec 26, 2025	Common Stock^F1^F2	65,000	$38.70	$2.52M	109,398

Green John L.Chief Financial Officer

Filed Dec 30, 2025Period of report Dec 26, 20250001193125-25-337051

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleDec 26, 2025	Common Stock^F1^F2	77,000	$38.68	$2.98M	131,834

Sachs JessicaChief Medical Officer

Filed Dec 30, 2025Period of report Dec 26, 20250001193125-25-337050

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleDec 26, 2025	Common Stock^F1^F2	82,642	$38.70	$3.20M	133,938

Robinson John EdwardChief Scientific Officer

Filed Dec 30, 2025Period of report Dec 26, 20250001193125-25-337049

Transaction	Security	Shares	Price	ValueValue (shares × price)	Held after	Ownership
SaleDec 26, 2025	Common Stock^F1^F2	90,000	$38.74	$3.49M	140,002

P and S transaction codes only. Grants, gifts, option exercises, tax withholding, and Form 144 notices are not counted as purchases or sales. A row whose filed price fails a plausibility check, or that is not common stock, is listed but left out of the values; a trade reported by several filers is counted once.