Stocks/Funds/CIK 1534261

Casdin Capital, LLC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1534261
Assets
$1.32B
+7.9% YoY
Holdings
40
Lifetime alpha vs market
-12.01% annual
Average hold time
2.9 yr
median 2.4 yr

Quarterly history

Cum return -9% vs S&P +52% · α -61% lifetimeAUM $1.3B · peak $4.0BFlow $-57M (-4%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-0.73%
trims when stocks drop
when a holding falls −10%+
Middle response
-2.96%
baseline attrition
Rally response
-2.78%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
RVMDRevolution Medicines, In$251M19.0%+175.0%6.3 yr
WGSGeneDx Holdings Corp.$193M14.6%-27.5%3.0 yr
RLAYRelay Therapeutics, Inc.$143M10.9%+279.8%5.8 yr
BLFSBioLife Solutions, Inc.$114M8.6%-16.5%8.0 yr
LABStandard BioTools Inc.$82M6.2%-14.9%3.0 yr
ILMNIllumina, Inc.$65M4.9%+55.4%7.8 yr
GPCRStructure Therapeutics I$57M4.3%+178.5%3.3 yr
TXG10x Genomics, Inc.$48M3.7%+143.2%0.5 yr
DNLIDenali Therapeutics Inc.$35M2.7%+41.2%7.5 yr
BEAMBeam Therapeutics Inc.$32M2.4%+22.0%5.5 yr
GHGuardant Health, Inc.$29M2.2%+116.8%2.8 yr
NGNENeurogene Inc.$29M2.2%+72.2%2.5 yr
ALNYAlnylam Pharmaceuticals,$25M1.9%+22.5%10.5 yr
MAZEMaze Therapeutics, Inc.$23M1.7%+171.1%1.3 yr
SRRKScholar Rock Holding Cor$17M1.3%+52.9%0.5 yr

Portfolio composition (YoY)

Industry mix
Biotechnology54.1%+11.1pp$714M
Medical - Healthcare Information Services19.3%-6.9pp$255M
Medical - Diagnostics & Research9.6%+3.4pp$126M
Medical - Instruments & Supplies8.6%-7.6pp$114M
Medical - Devices6.3%-0.5pp$83M
Medical - Equipment & Services1.1%+0.6pp$15M
Unknown1.1%+0.9pp$14M
Country
US96.8%-3.0pp
BE1.2%
Unknown1.1%+0.9pp
CH0.6%
KY0.3%
Top 5: 59.3% · Top 10: 77.3% · Top 25: 96.3%

Winners

TickerPrev $PnLYoY %
RVMD$131M+0.23B175.0%
RLAY$24M+0.07B279.8%
ILMN$47M+0.03B55.4%
GPCR$12M+0.02B178.5%
MAZE$10M+0.02B171.1%

Losers

TickerPrev $PnLYoY %
WGS$311M-0.09B-27.5%
BLFS$199M-0.03B-16.5%
LAB$82M-0.01B-14.9%
HIMS$6M-0.00B-29.7%

Top buys this quarter · 13

new+$0M
TXG 10x Genomics, Inc.+$19M
AGMB AgomAb Therapeutics N.V. Amerinew+$16M
RLAY Relay Therapeutics, Inc.+$14M
PSNL Personalis, Inc.new+$10M
MLTX MoonLake Immunotherapeuticsnew+$8M
TSHA Taysha Gene Therapies, Inc.+$8M
HIMS Hims & Hers Health, Inc.+$7M
SRRK Scholar Rock Holding Corporati+$4M
IRON Disc Medicine, Inc.new+$4M

Top sells this quarter · 14

RNAM Avidity Biosciences Incexit$0M
NTLA Intellia Therapeutics, Inc.$21M
UNH UnitedHealth Group Incorporateexit$14M
SPRY ARS Pharmaceuticals, Inc.exit$13M
DXCM DexCom, Inc.exit$11M
CI Cigna Corporationexit$11M
INCY Incyte Corporationexit$9M
ILMN Illumina, Inc.$9M
MRNA Moderna, Inc.$8M
GRAL GRAIL, Inc.$5M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$1.32B40+29.75%+17.59%+12.16%-0.06B
2025-12-31$1.61B38+23.65%+17.72%+5.93%+0.11B
2025-09-30$1.20B32-0.03%+17.52%-17.54%-0.11B
2025-06-30$1.10B33-6.99%+14.94%-21.93%-0.14B
2025-03-31$1.22B44-7.33%+8.30%-15.64%+0.00B
2024-12-31$1.50B38+25.54%+24.89%+0.66%-0.02B
2024-09-30$1.50B35+30.14%+36.04%-5.90%+0.04B
2024-06-30$1.31B38-5.70%+24.49%-30.19%-0.05B
2024-03-31$1.34B36-8.66%+29.62%-38.29%+0.22B
2023-12-31$1.01B36-16.86%+26.18%-43.03%+0.07B
2023-09-30$897M38-25.41%+21.57%-46.98%-0.03B
2023-06-30$1.14B41+14.29%+19.42%-5.13%-0.04B
2023-03-31$1.21B40-16.93%-7.82%-9.11%-0.08B
2022-12-31$1.28B44-5.91%+7.56%-13.47%-0.15B
2022-09-30$1.52B36+23.60%-4.93%+28.53%+0.05B
2022-06-30$1.18B40-28.97%-16.11%-12.86%-0.40B