13F Filings History of Fairmount Funds Management LLC

Latest 13F report
Q4 2025 - 17 Feb 2026
Value $
$1,313,784,318
Signature - Title
Erin O'Connor - Chief Compliance Officer
Location
West Conshohocken, PA
Summary
This page shows a list of all the recent 13F filings made by Fairmount Funds Management LLC. Form 13F is required to be filed within 45 days of the end of a calendar quarter. Fairmount Funds Management LLC reported 13 stock holdings with total value $1,313,784,318 as of Q4 2025. Top holdings included COGT, APGE, SYRE, VRDN, and ORKA.

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Holdings Value
Quarter Holdings Value $ Bought Sold Net Top Holdings Form Type Filing Time
Q4 2025 13 $1,313,784,318 +$67,452,086 -$320,282,824 -$252,830,738 COGT, APGE, SYRE, VRDN, ORKA 13F-HR 17 Feb 2026, 15:45
Q3 2025 17 $1,111,423,463 +$130,479,553 -$8,845,241 +$121,634,312 DNTH, COGT, AXSM, APGE, ELVN 13F-HR 14 Nov 2025, 15:45
Q2 2025 17 $771,902,136 +$108,432,779 -$10,217,735 +$98,215,044 APGE, AXSM, ELVN, SRRK, SYRE 13F-HR 14 Aug 2025, 15:45
Q1 2025 15 $644,620,652 $0 -$231,178,384 -$231,178,384 AXSM, APGE, SYRE, ELVN, NUVL 13F-HR 15 May 2025, 15:45
Q4 2024 17 $1,005,884,370 +$131,897,489 -$127,095,451 +$4,802,038 AXSM, NUVL, SYRE, APGE, SRRK 13F-HR 14 Feb 2025, 15:45
Q3 2024 15 $1,233,275,095 +$223,089,301 -$84,795,111 +$138,294,190 AXSM, NUVL, APGE, SYRE, ELVN 13F-HR 14 Nov 2024, 15:45
Q2 2024 13 $885,124,128 +$179,688,846 -$149,171,796 +$30,517,050 AXSM, NUVL, SYRE, APGE, ELVN 13F-HR 14 Aug 2024, 15:45
Q1 2024 15 $917,385,636 +$115,359,680 -$355,532,049 -$240,172,369 AXSM, NUVL, APGE, DNTH, KNSA 13F-HR 15 May 2024, 15:45
Q4 2023 16 $946,456,168 +$33,945,726 -$153,793,843 -$119,848,117 AXSM, IMGN, NUVL, APGE, RYZB 13F-HR 14 Feb 2024, 15:46
Q3 2023 20 $831,172,751 +$228,549,240 -$48,543,788 +$180,005,452 AXSM, NUVL, IMGN, APGE, MRUS 13F-HR 14 Nov 2023, 15:45
Q2 2023 17 $709,301,537 +$208,331,119 -$142,840,131 +$65,490,988 AXSM, NUVL, IMGN, ELVN, COGT 13F-HR 14 Aug 2023, 15:36
Q1 2023 16 $581,468,614 +$88,579,455 -$82,942,311 +$5,637,144 AXSM, NUVL, VRNA, BGNE, ELVN 13F-HR 15 May 2023, 09:09
Q4 2022 16 $630,363,234 +$86,101,660 -$146,016,800 -$59,915,140 AXSM, NUVL, VRNA, BGNE, VRDN 13F-HR 14 Feb 2023, 15:31
Q3 2022 26 $542,122,000 +$109,415,559 -$70,276,349 +$39,139,210 AXSM, COGT, NUVL, BCRX, BHVN 13F-HR 09 Nov 2022, 09:59
Q2 2022 27 $436,929,000 +$140,146,165 -$64,231,303 +$75,914,862 BHVN, AXSM, BCRX, GBT, ARGX 13F-HR 15 Aug 2022, 17:23
Q1 2022 22 $422,935,000 +$179,192,542 -$40,662,000 +$138,530,542 INSM, GBT, ARGX, AXSM, ENTA 13F-HR 16 May 2022, 16:00
Q4 2021 20 $303,335,000 +$56,277,724 -$15,872,517 +$40,405,207 ZGNX, INSM, ENTA, ARGX, GBT 13F-HR 14 Feb 2022, 16:30
Q3 2021 20 $274,991,000 +$77,673,199 -$37,082,380 +$40,590,819 INSM, ZGNX, NUVL, ALLK, ENTA 13F-HR 15 Nov 2021, 16:23
Q2 2021 19 $243,235,000 +$56,277,556 -$24,792,452 +$31,485,104 INSM, ZGNX, AXSM, ARGX, IOVA 13F-HR 13 Aug 2021, 11:24
Q1 2021 21 $237,245,000 +$37,138,962 -$20,520,227 +$16,618,735 INSM, ZGNX, IOVA, ALLK, AXSM 13F-HR 14 May 2021, 09:28
Q4 2020 18 $279,600,000 +$39,270,727 -$45,418,244 -$6,147,517 INSM, FOLD, IOVA, ACAD, TRILLIUM THERAPEUTICS INC 13F-HR 12 Feb 2021, 10:45
Q3 2020 17 $236,102,000 +$28,441,162 -$7,329,042 +$21,112,120 INSM, ACAD, TRILLIUM THERAPEUTICS INC, FOLD, IOVA 13F-HR 12 Nov 2020, 15:42
Q2 2020 14 $224,208,000 +$13,139,456 -$10,420,409 +$2,719,047 ACAD, INSM, ZGNX, FOLD, AXSM 13F-HR 04 Aug 2020, 16:02
Q1 2020 14 $164,882,000 +$55,094,066 -$10,232,604 +$44,861,462 ACAD, ZGNX, INSM, IOVA, FOLD 13F-HR 08 May 2020, 10:20
Q4 2019 15 $164,989,000 $0 $0 $0 ZGNX, INSM, ACAD, AMRN, IOVA 13F-HR 12 Feb 2020, 16:05