Fairmount Funds Management LLC

COGT

Fairmount Funds Management LLC serves as director, 10 percent owner: at Cogent Biosciences, Inc. (COGT). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

10 trades

$84.40M

Total Sells

1 trades

$242.62M

Net Position

Net Seller

$158.22M

Companies Traded

VRDN, ZBIO, COGT, DNTH

Active Period

Sep 2021 – May 2026

11 total trades

Most Recent

Buy VRDN

May 13, 2026 · $20.00M

Fairmount Funds Management LLC's Insider Trading at Cogent Biosciences, Inc. (COGT)

Buys

0 · $0.00

Sells

1 · $242.62M

Total Shares Bought

Total Shares Sold

7,000,000

COGT Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Mar 31, 2026	Sell	7,000,000	$34.66	$242.62M	5,503,418

Fairmount Funds Management LLC's Insider Trading at Viridian Therapeutics, Inc. (VRDN)

Buys

5 · $80.00M

Sells

0 · $0.00

Total Shares Bought

4,587,191

Total Shares Sold

VRDN Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
May 13, 2026	Buy	1,176,470	$17.00	$20.00M	5,090,928
Sep 17, 2024	Buy	1,600,000	$18.75	$30.00M	3,445,813
Jan 24, 2024	Buy	476,190	$21.00	$10.00M	1,839,954
Aug 19, 2022	Buy	425,531	$23.50	$10.00M	1,363,764
Sep 23, 2021	Buy	909,000	$11.00	$10.00M	938,233

Fairmount Funds Management LLC's Insider Trading at Zenas BioPharma, Inc. (ZBIO)

Buys

1 · $3.00M

Sells

0 · $0.00

Total Shares Bought

150,000

Total Shares Sold

ZBIO Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Apr 1, 2026	Buy	150,000	$20.00	$3.00M	2,359,025

Fairmount Funds Management LLC's Insider Trading at Dianthus Therapeutics, Inc. (DNTH)

Buys

4 · $1.40M

Sells

0 · $0.00

Total Shares Bought

108,924

Total Shares Sold

DNTH Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Oct 3, 2023	Buy	24,670	$13.63	$336.3K	1,928,503
Sep 28, 2023	Buy	30,000	$13.15	$394.5K	1,903,833
Sep 21, 2023	Buy	30,000	$13.20	$396.0K	1,873,833
Sep 13, 2023	Buy	24,254	$11.20	$271.7K	1,843,833