Stocks/Funds/CIK 1442756

Partner Fund Management, L.P.

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1442756
Assets
$933M
-26.3% YoY
Holdings
76
Lifetime alpha vs market
-4.92% annual
Average hold time
2.3 yr
median 1.3 yr

Quarterly history

Cum return +31% vs S&P +62% · α -31% lifetimeAUM $933M · peak $5.5BFlow $0M (+0%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-14.86%
trims when stocks drop
when a holding falls −10%+
Middle response
-9.27%
baseline attrition
Rally response
-11.16%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
THCTenet Healthcare Corpora$75M8.1%+40.3%7.3 yr
LLYEli Lilly and Company$60M6.5%+12.2%5.8 yr
PENPenumbra, Inc.$46M4.9%+22.8%10.5 yr
AXSMAxsome Therapeutics, Inc$45M4.8%+44.9%4.0 yr
$35M3.7%2.3 yr
JAZZJazz Pharmaceuticals plc$34M3.6%+52.3%3.8 yr
NBIXNeurocrine Biosciences, $28M3.0%+19.1%2.3 yr
UTHRUnited Therapeutics Corp$24M2.5%+92.4%1.3 yr
GKOSGlaukos Corporation$23M2.5%+9.4%0.5 yr
CNTACentessa Pharmaceuticals$21M2.2%+176.2%2.3 yr
$21M2.2%2.0 yr
EWEdwards Lifesciences Cor$20M2.2%+10.5%10.5 yr
BBIOBridgeBio Pharma, Inc.$19M2.1%+114.8%1.5 yr
MDGLMadrigal Pharmaceuticals$18M1.9%+58.0%1.3 yr
INDVIndivior Pharmaceuticals$18M1.9%0.3 yr

Portfolio composition (YoY)

Industry mix
Biotechnology39.2%+16.5pp$366M
Medical - Devices14.6%+3.8pp$136M
Medical - Care Facilities11.0%+1.3pp$103M
Unknown8.5%-0.3pp$79M
Medical - Diagnostics & Research7.2%+0.4pp$67M
Drug Manufacturers - General6.5%-16.9pp$60M
Medical - Healthcare Plans3.9%-7.0pp$36M
Drug Manufacturers - Specialty & Generic3.1%$29M
Medical - Instruments & Supplies2.9%+1.3pp$27M
Medical - Distribution1.9%-3.2pp$18M
Country
US82.1%-3.7pp
Unknown8.5%-0.3pp
IE4.3%+3.7pp
GB3.7%+2.9pp
DK0.8%+0.6pp
NL0.4%-3.3pp
FR0.3%
Top 5: 28.0% · Top 10: 41.9% · Top 25: 66.4%

Winners

TickerPrev $PnLYoY %
BBIO$31M+0.04B114.8%
AXSM$65M+0.03B44.9%
LLY$226M+0.03B12.2%
THC$66M+0.03B40.3%
CNTA$8M+0.01B176.2%

Losers

TickerPrev $PnLYoY %
UNH$19M-0.01B-46.9%
WAT$19M-0.00B-19.2%
NEO$6M-0.00B-21.8%

Top buys this quarter · 15

JAZZ Jazz Pharmaceuticals plc+$24M
INDV Indivior Pharmaceuticals Incnew+$18M
MDGL Madrigal Pharmaceuticals, Inc.+$14M
ORKA Oruka Therapeutics, Inc.new+$9M
TNGX Tango Therapeutics, Inc.new+$8M
RYTM Rhythm Pharmaceuticals, Inc.+$8M
NVO Novo Nordisk A/Snew+$7M
NBIX Neurocrine Biosciences, Inc.+$7M
ALHC Alignment Healthcare, Inc.new+$6M
BLTE Belite Bio, Inc+$6M

Top sells this quarter · 15

ROIV Roivant Sciences Ltd.$28M
MRK Merck & Co., Inc.exit$23M
MMSI Merit Medical Systems, Inc.$19M
ABT Abbott Laboratories$19M
MDT Medtronic plcexit$19M
HSIC Henry Schein, Inc.$18M
UTHR United Therapeutics Corporatio$17M
CNC Centene Corporation$15M
TFX Teleflex Incorporatedexit$12M
ADMA ADMA Biologics, Inc.exit$11M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$933M76+21.40%+17.59%+3.81%+0.00B
2025-12-31$973M76+30.88%+17.72%+13.16%-0.40B
2025-09-30$1.16B66+6.49%+17.52%-11.03%-0.02B
2025-06-30$1.13B55+4.97%+14.94%-9.97%-0.17B
2025-03-31$1.27B62-2.38%+8.30%-10.68%-0.05B
2024-12-31$1.28B70+4.12%+24.89%-20.77%-0.36B
2024-09-30$1.70B71+19.67%+36.04%-16.37%-0.13B
2024-06-30$1.77B70+12.83%+24.49%-11.67%-0.09B
2024-03-31$1.96B79+29.68%+29.62%+0.05%+0.18B
2023-12-31$1.61B59+6.70%+26.18%-19.48%-0.65B
2023-09-30$2.04B67+0.49%+21.57%-21.08%-0.34B
2023-06-30$2.46B77+4.56%+19.42%-14.86%+0.18B
2023-03-31$2.08B71-17.49%-7.82%-9.67%+0.02B
2022-12-31$2.27B75+4.52%+7.56%-3.05%-0.30B
2022-09-30$2.46B75+0.95%-4.93%+5.87%-0.03B
2022-06-30$2.47B72-13.84%-16.11%+2.27%+0.31B