United States Biotechnology & Medical Research

Cogent Biosciences Inc (COGT)

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The most recent insider trading activity occurred on March 31, 2026, with significant sell transactions totaling over $485 million from Fairmount Funds Management LLC and Fairmount Healthcare Fund II L.P. Prior to this, on January 22, 2026, these entities also executed substantial sell transactions. Earlier, in December 2025, several executives, including the Chief Medical Officer and Chief Scientific Officer, made sell transactions.
Ticker: COGT Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Top insiders
Trades
Fairmount Funds Management LLC
1 sale — total 242,620,000 USD
Sale 31 Mar 2026
Value US$1,042,476.33 | Price 34.80 | Shares 61,192
Proposed sale 31 Mar 2026
Value US$171,724.58 | Price 219.00 | Shares 80,323
Proposed sale 22 Jan 2026
Value US$127,400,000.00 | Price 36.40 | Shares 3,500,000
Sale 22 Jan 2026
Value US$127,400,000.00 | Price 36.40 | Shares 3,500,000
Sale 26 Dec 2025
Value US$2,978,360.00 | Price 38.68 | Shares 77,000
Sale 26 Dec 2025
Value US$3,198,245.40 | Price 38.70 | Shares 82,642
Sale 26 Dec 2025
Value US$3,486,600.00 | Price 38.74 | Shares 90,000
Sale 26 Dec 2025
Value US$2,515,500.00 | Price 38.70 | Shares 65,000
Proposed sale 26 Dec 2025
Value US$3,198,435.48 | Price 38.70 | Shares 82,642
Proposed sale 26 Dec 2025
Value US$3,486,276.00 | Price 38.74 | Shares 90,000
Proposed sale 26 Dec 2025
Value US$2,978,321.50 | Price 38.68 | Shares 77,000
Proposed sale 26 Dec 2025
Value US$2,515,175.00 | Price 38.70 | Shares 65,000
Buy 10 Jul 2025
Value US$24,999,993.00 | Price 9.00 | Shares 2,777,777
Planned buy 14 Jan 2025
Value US$332,412.50 | Price 7.60 | Shares 43,750
Buy 9 Jun 2023
Value US$9,600,000.00 | Price 12.00 | Shares 800,000
Buy 16 Jun 2022
Value US$9,900,000.00 | Price 8.25 | Shares 1,200,000
Sale 26 Apr 2021
Value US$157,823.18 | Price 8.86 | Shares 17,813
Buy 18 Aug 2020
Value US$264,620.00 | Price 2.62 | Shares 101,000
Buy 17 Aug 2020
Value US$642,500.00 | Price 2.57 | Shares 250,000
Buy 14 Aug 2020
Value US$230,000.00 | Price 2.30 | Shares 100,000
Sale 12 May 2020
Value US$45,545.16 | Price 0.46 | Shares 98,200
Sale 11 May 2020
Value US$35,160.08 | Price 0.45 | Shares 77,719
Sale 11 May 2020
Value US$10,336.16 | Price 0.46 | Shares 22,281
Sale 8 May 2020
Value US$46,390.00 | Price 0.46 | Shares 100,000
Sale 7 May 2020
Value US$41,430.00 | Price 0.41 | Shares 100,000
Sale 6 May 2020
Value US$721.62 | Price 0.40 | Shares 1,800
Sale 5 May 2020
Value US$54,437.47 | Price 0.40 | Shares 135,484
Sale 4 May 2020
Value US$1,920.88 | Price 0.40 | Shares 4,795
Sale 1 May 2020
Value US$328.00 | Price 0.41 | Shares 800
Sale 30 Apr 2020
Value US$30,557.19 | Price 0.40 | Shares 75,994
Sale 29 Apr 2020
Value US$155,506.65 | Price 0.41 | Shares 382,927
Sale 28 Apr 2020
Value US$6,168.18 | Price 0.41 | Shares 15,048
Sale 27 Apr 2020
Value US$97,807.85 | Price 0.40 | Shares 242,579
Sale 20 Apr 2020
Value US$5,049.96 | Price 0.40 | Shares 12,606
Sale 17 Apr 2020
Value US$25,573.71 | Price 0.39 | Shares 65,540
Sale 16 Apr 2020
Value US$229.56 | Price 0.38 | Shares 600
Sale 15 Apr 2020
Value US$31,796.57 | Price 0.38 | Shares 82,782
Sale 14 Apr 2020
Value US$17,602.40 | Price 0.40 | Shares 44,006
Sale 14 Apr 2020
Value US$22,118.72 | Price 0.40 | Shares 54,967
Sale 9 Apr 2020
Value US$138,149.98 | Price 0.33 | Shares 420,292
Sale 8 Apr 2020
Value US$35.10 | Price 0.35 | Shares 100
Sale 7 Apr 2020
Value US$3,990.00 | Price 0.35 | Shares 11,400
Sale 6 Apr 2020
Value US$17,528.00 | Price 0.35 | Shares 50,080
Planned sale 25 Mar 2019
Value US$47,334.28 | Price 4.12 | Shares 11,485
Planned sale 25 Feb 2019
Value US$48,852.60 | Price 4.25 | Shares 11,485
Planned sale 26 Dec 2018
Value US$46,486.69 | Price 4.05 | Shares 11,485
Planned sale 26 Nov 2018
Value US$80,444.39 | Price 7.00 | Shares 11,485
Planned sale 25 Oct 2018
Value US$97,201.00 | Price 8.46 | Shares 11,485
Planned sale 25 Sep 2018
Value US$143,181.20 | Price 12.47 | Shares 11,485
Buy 3 Apr 2018
Value US$1,128,624.00 | Price 12.00 | Shares 94,052
Buy 3 Apr 2018
Value US$1,128,624.00 | Price 12.00 | Shares 94,052
Buy 3 Apr 2018
Value US$1,128,624.00 | Price 12.00 | Shares 94,052
Buy 3 Apr 2018
Value US$3,300,000.00 | Price 12.00 | Shares 275,000
Buy 3 Apr 2018
Value US$3,300,000.00 | Price 12.00 | Shares 275,000
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-03-31 2026-03-31 S Sale
3.4
Fairmount Funds Management LLC
Non-Executive Director
61,192 +12.2%
34.80
US$1,042,476 		61,192 +12.2% 34.80 US$1,042,476
2026-03-31 2026-03-31 PrS Proposed sale
3.4
Fairmount Healthcare Fund II L.P.

Director

Non-Executive Director
80,323
219.00
US$171,725 		80,323 219.00 US$171,725
2026-01-22 2026-01-22 PrS Proposed sale
3.4
Fairmount Healthcare Fund II L.P.

Director

Non-Executive Director
5,918
36.72
US$24,498 		5,918 36.72 US$24,498
2026-01-22 2026-01-22 S Sale
3.4
Fairmount Funds Management LLC
Non-Executive Director
3,500,000 -38.9%
36.40
US$127,400,000 		3,500,000 -38.9% 36.40 US$127,400,000
2025-12-30 2025-12-26 S Sale
3.4
Green John L.

Chief Financial Officer

Officer
77,000 -36.9%
38.68
US$2,978,360 		77,000 -36.9% 38.68 US$2,978,360
2025-12-30 2025-12-26 S Sale
2.7
Sachs Jessica

Chief Medical Officer

Officer
82,642 -38.2%
38.70
US$3,198,245 		82,642 -38.2% 38.70 US$3,198,245
2025-12-30 2025-12-26 S Sale
2.7
Robinson John Edward

Chief Scientific Officer

Officer
90,000 -39.1%
38.74
US$3,486,600 		90,000 -39.1% 38.74 US$3,486,600
2025-12-30 2025-12-26 S Sale
2.7
Kearns Evan

Chief Legal Officer

Officer
65,000 -37.3%
38.70
US$2,515,500 		65,000 -37.3% 38.70 US$2,515,500
2025-12-29 2025-12-26 PrS Proposed sale
2.7
JESSICA SACHS

Officer

Officer
82,642
38.70
US$3,198,435 		82,642 38.70 US$3,198,435
2025-12-29 2025-12-26 PrS Proposed sale
2.7
JOHN ROBINSON

Officer

Officer
90,000
38.74
US$3,486,276 		90,000 38.74 US$3,486,276
2025-12-29 2025-12-26 PrS Proposed sale
3.4
JOHN GREEN

Officer

Officer
77,000
38.68
US$2,978,322 		77,000 38.68 US$2,978,322
2025-12-29 2025-12-26 PrS Proposed sale
2.7
EVAN D KEARNS

Officer

Officer
65,000
38.70
US$2,515,175 		65,000 38.70 US$2,515,175
2025-07-14 2025-07-10 B Purchase
3.4
Fairmount Funds Management LLC
Non-Executive Director
2,777,777 +44.6%
9.00
US$24,999,993 		2,777,777 +44.6% 9.00 US$24,999,993
2025-01-15 2025-01-14 PP Planned purchase
Pinnow Cole

Chief Commercial Officer

Officer
43,750 +2085.3%
7.60
US$332,412 		43,750 +2085.3% 7.60 US$332,412
2023-06-13 2023-06-09 B Purchase
3.4
Fairmount Funds Management LLC
Large shareholder
800,000 +32.4%
12.00
US$9,600,000 		800,000 +32.4% 12.00 US$9,600,000
2022-06-21 2022-06-16 B Purchase
3.4
Fairmount Funds Management LLC
Large shareholder
1,200,000 +94.3%
8.25
US$9,900,000 		1,200,000 +94.3% 8.25 US$9,900,000
2021-04-28 2021-04-26 S Sale
3.4
Green John L.

Chief Financial Officer

Officer
17,813 -82.3%
8.86
US$157,823 		17,813 -82.3% 8.86 US$157,823
2020-08-18 2020-08-18 B Purchase
3.8
Venrock Healthcare Capital Partners III, L.P.
Large shareholder
101,000 +2.4%
2.62
US$264,620 		101,000 +2.4% 2.62 US$264,620
2020-08-18 2020-08-17 B Purchase
3.8
Venrock Healthcare Capital Partners III, L.P.
Large shareholder
250,000 +6.2%
2.57
US$642,500 		250,000 +6.2% 2.57 US$642,500
2020-08-18 2020-08-14 B Purchase
3.8
Venrock Healthcare Capital Partners III, L.P.
Large shareholder
100,000 +2.6%
2.30
US$230,000 		100,000 +2.6% 2.30 US$230,000
2020-10-08 2020-05-12 S Sale
1.1
CAMPANA DARIO
Large shareholder
98,200 -3.1%
0.46
US$45,545 		98,200 -3.1% 0.46 US$45,545
2020-10-08 2020-05-11 S Sale
1.1
CAMPANA DARIO
Large shareholder
77,719 -2.4%
0.45
US$35,160 		77,719 -2.4% 0.45 US$35,160
2020-10-08 2020-05-11 S Sale
1.1
CAMPANA DARIO
Large shareholder
22,281 -0.7%
0.46
US$10,336 		22,281 -0.7% 0.46 US$10,336
2020-10-08 2020-05-08 S Sale
1.1
CAMPANA DARIO
Large shareholder
100,000 -2.9%
0.46
US$46,390 		100,000 -2.9% 0.46 US$46,390
2020-10-08 2020-05-07 S Sale
1.1
CAMPANA DARIO
Large shareholder
100,000 -2.9%
0.41
US$41,430 		100,000 -2.9% 0.41 US$41,430
2020-10-08 2020-05-06 S Sale
1.1
CAMPANA DARIO
Large shareholder
1,800 -0.1%
0.40
US$722 		1,800 -0.1% 0.40 US$722
2020-10-08 2020-05-05 S Sale
1.1
CAMPANA DARIO
Large shareholder
135,484 -3.7%
0.40
US$54,437 		135,484 -3.7% 0.40 US$54,437
2020-10-08 2020-05-04 S Sale
1.1
CAMPANA DARIO
Large shareholder
4,795 -0.1%
0.40
US$1,921 		4,795 -0.1% 0.40 US$1,921
2020-10-08 2020-05-01 S Sale
1.1
CAMPANA DARIO
Large shareholder
800 -0.0%
0.41
US$328 		800 -0.0% 0.41 US$328
2020-10-08 2020-04-30 S Sale
1.1
CAMPANA DARIO
Large shareholder
75,994 -2.0%
0.40
US$30,557 		75,994 -2.0% 0.40 US$30,557
2020-10-08 2020-04-29 S Sale
1.1
CAMPANA DARIO
Large shareholder
382,927 -9.4%
0.41
US$155,507 		382,927 -9.4% 0.41 US$155,507
2020-10-08 2020-04-28 S Sale
1.1
CAMPANA DARIO
Large shareholder
15,048 -0.4%
0.41
US$6,168 		15,048 -0.4% 0.41 US$6,168
2020-10-08 2020-04-27 S Sale
1.1
CAMPANA DARIO
Large shareholder
242,579 -5.6%
0.40
US$97,808 		242,579 -5.6% 0.40 US$97,808
2020-10-08 2020-04-20 S Sale
1.1
CAMPANA DARIO
Large shareholder
12,606 -0.3%
0.40
US$5,050 		12,606 -0.3% 0.40 US$5,050
2020-10-08 2020-04-17 S Sale
1.1
CAMPANA DARIO
Large shareholder
65,540 -1.5%
0.39
US$25,574 		65,540 -1.5% 0.39 US$25,574
2020-10-08 2020-04-16 S Sale
1.1
CAMPANA DARIO
Large shareholder
600 -0.0%
0.38
US$230 		600 -0.0% 0.38 US$230
2020-10-08 2020-04-15 S Sale
1.1
CAMPANA DARIO
Large shareholder
82,782 -1.8%
0.38
US$31,797 		82,782 -1.8% 0.38 US$31,797
2020-10-08 2020-04-14 S Sale
1.1
CAMPANA DARIO
Large shareholder
44,006 -1.0%
0.40
US$17,602 		44,006 -1.0% 0.40 US$17,602
2020-10-08 2020-04-14 S Sale
1.1
CAMPANA DARIO
Large shareholder
54,967 -1.2%
0.40
US$22,119 		54,967 -1.2% 0.40 US$22,119
2020-10-08 2020-04-09 S Sale
1.1
CAMPANA DARIO
Large shareholder
420,292 -8.3%
0.33
US$138,150 		420,292 -8.3% 0.33 US$138,150
2020-10-08 2020-04-08 S Sale
1.1
CAMPANA DARIO
Large shareholder
100 -0.0%
0.35
US$35 		100 -0.0% 0.35 US$35
2020-10-08 2020-04-07 S Sale
1.1
CAMPANA DARIO
Large shareholder
11,400 -0.2%
0.35
US$3,990 		11,400 -0.2% 0.35 US$3,990
2020-10-08 2020-04-06 S Sale
1.1
CAMPANA DARIO
Large shareholder
50,080 -1.0%
0.35
US$17,528 		50,080 -1.0% 0.35 US$17,528
2019-03-26 2019-03-25 PlS Planned sale
Ettenberg Seth

Chief Scientific Officer
11,485 -100.0%
4.12
US$47,334 		11,485 -100.0% 4.12 US$47,334
2019-02-26 2019-02-25 PlS Planned sale
Ettenberg Seth

Chief Scientific Officer

Officer
11,485 -100.0%
4.25
US$48,853 		11,485 -100.0% 4.25 US$48,853
2018-12-28 2018-12-26 PlS Planned sale Ettenberg Seth

Chief Scientific Officer

Officer
11,485 -100.0%
4.05
US$46,487 		11,485 -100.0% 4.05 US$46,487
2018-11-26 2018-11-26 PlS Planned sale Ettenberg Seth

Chief Scientific Officer

Officer
11,485 -100.0%
7.00
US$80,444 		11,485 -100.0% 7.00 US$80,444
2018-10-29 2018-10-25 PlS Planned sale Ettenberg Seth

Chief Scientific Officer

Officer
11,485 -100.0%
8.46
US$97,201 		11,485 -100.0% 8.46 US$97,201
2018-09-26 2018-09-25 PlS Planned sale Ettenberg Seth

Chief Scientific Officer

Officer
11,485 -100.0%
12.47
US$143,181 		11,485 -100.0% 12.47 US$143,181
2018-04-05 2018-04-03 B Purchase FMR LLC

See Remark 1
94,052 +26.3%
12.00
US$1,128,624 		94,052 +26.3% 12.00 US$1,128,624
2018-04-03 2018-04-03 B Purchase Booth Bruce Non-Executive Director
94,052 +2.9%
12.00
US$1,128,624 		94,052 +2.9% 12.00 US$1,128,624
2018-04-03 2018-04-03 B Purchase Atlas Venture Fund IX, L.P. Large shareholder
94,052 +2.9%
12.00
US$1,128,624 		94,052 +2.9% 12.00 US$1,128,624
2018-04-03 2018-04-03 B Purchase Ratcliffe Liam Non-Executive Director
275,000 +44.2%
12.00
US$3,300,000 		275,000 +44.2% 12.00 US$3,300,000
2018-04-03 2018-04-03 B Purchase Ratcliffe Liam Non-Executive Director
275,000 +44.2%
12.00
US$3,300,000 		275,000 +44.2% 12.00 US$3,300,000
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