Fairmount Funds Management LLC

CIK

1802528

Location

WEST CONSHOHOCKEN, PA

Portfolio Value

Mid $1,313,784,312

Diversification

Diversified

Filing Date

Global Rank

#1,389 / 8,420 ▲ 276

Top Industry

Biotechnology 95.9%

3Y Alpha vs SPY

+24.0%

Period ended 6 months ago

Filed Feb 17, 2026 · 4mo

24 quarters · since Mar 2020

Clone Performance

Jun 2023–Jun 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+203.4%

SPY

+76.3%

Annualised alpha

+24.0%

Max drawdown

−44.7%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

13 positions · as of Dec 31, 2025 · Δ vs Sep 30, 2025

Top Position

24.3%

+12.4 pts

Top 5

64.0%

+16.4 pts

Top 10

92.0%

+12.3 pts

HHI

1,176

Diversified+405

Portfolio Trend

24 quarters · across all stocks

Sector Breakdown

As of Dec 31, 2025

Sector	% Portfolio	Value	Positions
Healthcare	100.0%	$1,313,784,312	13

Last Quarter's Activity

Export CSV

Dec 31, 2025 vs Sep 30, 2025

Added To

Positions the filer increased

5 positions

Ticker	Company	Δ Shares	Shares	Value
IKT	Inhibikase Therapeutics, Inc.	+2,500,000	8,625,000	$17,681,250
CBIO	Crescent Biopharma, Inc.	+1,360,000	2,747,866	$32,589,690
JBIO	Jade Biosciences, Inc.	+1,333,126	4,553,494	$70,260,412
VRDN	Viridian Therapeutics, Inc.DE	+454,545	3,914,458	$121,817,932
ZBIO	Zenas BioPharma, Inc.	+316,219	2,209,025	$80,209,697
No positions match the current search.

Trimmed

Positions the filer reduced

2 positions

Ticker	Company	Δ Shares	Shares	Value
DNTH	Dianthus Therapeutics, Inc. /DE/	−1,170,000	2,137,191	$88,073,641
KNSA	Kiniksa Pharmaceuticals International, plc	−453,151	1,319,688	$54,437,130
No positions match the current search.

New Positions

Positions the filer opened this quarter

No qualifying positions this quarter.

Sold Out

Positions the filer fully exited

3 positions

Ticker	Company	Shares	Value
AXSM	Axsome Therapeutics, Inc.	815,176	$99,003,125
SRRK	Scholar Rock Holding Corp	1,824,031	$67,926,914
ABVX	Abivax S.A.	713,434	$60,570,546
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

13 positions · $1,313,784,312 total · as of Dec 31, 2025

All sectors Healthcare

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
COGT	Cogent Biosciences, Inc. Healthcare	Held	9,003,418	0	$319,801,407	+147.4%	24.34%
APGE	Apogee Therapeutics, Inc. Healthcare	Held	2,048,647	0	$154,631,875	+90.0%	11.77%
SYRE	Spyre Therapeutics, Inc. Healthcare	Held	4,018,101	0	$131,632,988	+95.5%	10.02%
VRDN	Viridian Therapeutics, Inc.DE Healthcare	Added	3,914,458	+454,545	$121,817,932	+63.2%	9.27%
ORKA	Oruka Therapeutics, Inc. Healthcare	Held	3,705,262	0	$112,306,491	+57.6%	8.55%
DNTH	Dianthus Therapeutics, Inc. /DE/ Healthcare	Reduced	2,137,191	-1,170,000	$88,073,641	−32.3%	6.70%
ZBIO	Zenas BioPharma, Inc. Healthcare	Added	2,209,025	+316,219	$80,209,697	+90.9%	6.11%
NUVL	Nuvalent, Inc. Healthcare	Held	727,563	0	$73,185,562	+16.3%	5.57%
JBIO	Jade Biosciences, Inc. Healthcare	Added	4,553,494	+1,333,126	$70,260,412	+152.8%	5.35%
ELVN	Enliven Therapeutics, Inc. Healthcare	Held	3,711,444	0	$57,156,237	−24.8%	4.35%
KNSA	Kiniksa Pharmaceuticals International, plc Healthcare	Reduced	1,319,688	-453,151	$54,437,130	−20.9%	4.14%
CBIO	Crescent Biopharma, Inc. Healthcare	Added	2,747,866	+1,360,000	$32,589,690	+97.5%	2.48%
IKT	Inhibikase Therapeutics, Inc. Healthcare	Added	8,625,000	+2,500,000	$17,681,250	+78.2%	1.35%