Fairmount Funds Management LLC

Director

Fairmount Funds Management LLC (Director) filed 10 Form 4 reports as a reporting entity in the trailing twelve months (6 purchases, 4 sales), most often in Cogent Biosciences, Inc. (COGT). Across 6 priced purchase filings, the average 21-session return was +5.9% from execution and +8.5% from disclosure (delay-adjusted; derived). The largest single filing was $399.7M of SYRE (4,684,781 sh × $85.31, as filed), executed Jun 23.

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Return, ttmiAverage return per filing, trailing twelve months

+5.9%

avg across 6 priced filings

Delay-adjustediThe same average, entered at disclosure dates

+8.5%

same 6 filings, from disclosure

Filings, ttm

6 buys · 4 sells

Median delay

execution → disclosure

Volume, ttmiDollar value disclosed in the trailing twelve months

$1.1B

shares × price, as filed

Last traded

Jul 16

Filed Jul 20

Median ADV $84.0M across their filed names

Impact on $10,000 · 12M

$12,544 (+25.4%)

S&P 500 $11,725 (+17.2%) · 8.2 pts ahead

Fairmount Funds Management LLC S&P 500

Compounded across filings from disclosure dates · past 12 months

Open performance→

Volume by month

Buys $94.6M Sells $1.1B

Shares × price, as filed · by filing month · past 24 months

Sectors filed on

Healthcare 10 filings

Sector per market data · by filing · past 12 months

Most traded names

COGT

Cogent Biosciences, Inc. COGT · 1 buy · 2 sells 3 filings CBIO

Crescent Biopharma, Inc. CBIO · 2 buys · 0 sells 2 filings VRDN

Viridian Therapeutics, Inc. VRDN · 2 buys · 0 sells 2 filings ZBIO

Zenas BioPharma, Inc. ZBIO · 2 buys · 0 sells 2 filings ORKA

Oruka Therapeutics, Inc. ORKA · 0 buys · 1 sell 1 filing

Recent filings

CBIOPURCHASE Crescent Biopharma, Inc. View filing → $12.4M
853,450 sh × $14.50
Exec Jul 16
Filed Jul 20 · 5:30 PM ET ORKASALE Oruka Therapeutics, Inc. View filing → $300.0M
3,553,410 sh × $84.43
Exec Jul 1
Filed Jul 1 · 9:30 PM ET SYRESALE Spyre Therapeutics, Inc. View filing → $399.7M
4,684,781 sh × $85.31
Exec Jun 23
Filed Jun 23 · 5:30 PM ET VRDNPURCHASE Viridian Therapeutics, Inc. View filing → $20.0M
1,176,470 sh × $17.00
Exec May 11
Filed May 13 · 4:31 PM ET COGTSALE Cogent Biosciences, Inc. View filing → $242.6M
7,000,000 sh × $34.66
Exec Mar 31
Filed Mar 31 · 5:30 PM ET ZBIOPURCHASE Zenas BioPharma, Inc. View filing → $3.0M
150,000 sh × $20.00
Exec Mar 31
Filed Apr 1 · 4:30 PM ET COGTSALE Cogent Biosciences, Inc. View filing → $127.4M
3,500,000 sh × $36.40
Exec Jan 22
Filed Jan 22 · 5:30 PM ET CBIOPURCHASE Crescent Biopharma, Inc. View filing → $18.2M
1,360,000 sh × $13.41
Exec Dec 4 2025
Filed Dec 8 2025 · 4:30 PM ET More filings →