Stocks/Funds/CIK 902367

BLAIR WILLIAM & CO/IL

index-like (500+ pos)long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 902367
Assets
$34.73B
+5.4% YoY
Holdings
1,893
Lifetime alpha vs market
-2.13% annual
Average hold time
6.3 yr
median 7.0 yr

Quarterly history

Cum return +199% vs S&P +272% · α -74% lifetimeAUM $34.7B · peak $37.4BFlow $386M (+1%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-4.31%
trims when stocks drop
when a holding falls −10%+
Middle response
+0.21%
steady accumulation
Rally response
+1.14%
adds into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
AAPLApple Inc.$1.51B4.3%+14.7%10.5 yr
MSFTMicrosoft Corporation$1.29B3.7%-0.6%10.5 yr
AMZNAmazon.com, Inc.$1.26B3.6%+9.5%10.5 yr
NVDANVIDIA Corporation$947M2.7%+60.9%10.3 yr
GOOGAlphabet Inc.$871M2.5%+84.3%10.5 yr
GOOGLAlphabet Inc.$701M2.0%10.5 yr
JPMJPMorgan Chase & Co.$679M2.0%+21.8%10.5 yr
GEVGE Vernova Inc.$580M1.7%+186.8%2.0 yr
VVisa Inc.$558M1.6%-13.1%10.5 yr
SPYState Street SPDR S&P 50$550M1.6%+17.6%10.5 yr
IDXXIDEXX Laboratories, Inc.$532M1.5%+33.8%10.5 yr
COSTCostco Wholesale Corpora$519M1.5%+5.9%10.5 yr
MAMastercard Incorporated$461M1.3%-8.5%10.5 yr
METAMeta Platforms, Inc.$413M1.2%-0.4%10.5 yr
FASTFastenal Company$342M1.0%+22.1%10.5 yr

Portfolio composition (YoY)

Industry mix
Asset Management17.8%+4.8pp$6.17B
Internet Content & Information5.8%+2.0pp$2.00B
Software - Infrastructure5.7%-1.1pp$1.96B
Semiconductors5.3%+2.0pp$1.83B
Consumer Electronics4.3%+0.2pp$1.51B
Specialty Retail4.2%-0.0pp$1.44B
Financial - Credit Services3.7%-0.9pp$1.27B
Aerospace & Defense3.7%+1.3pp$1.27B
Drug Manufacturers - General3.6%-0.4pp$1.23B
Software - Application3.2%-3.8pp$1.13B
Country
US97.1%+0.8pp
IE0.8%-0.7pp
CA0.7%+0.1pp
GB0.6%+0.1pp
Unknown0.2%-0.2pp
TW0.1%+0.1pp
CH0.1%+0.0pp
NL0.1%+0.1pp
Top 5: 16.9% · Top 10: 25.8% · Top 25: 41.0%

Winners

TickerPrev $PnLYoY %
GOOG$502M+0.42B84.3%
NVDA$583M+0.36B60.9%
AAPL$1.37B+0.20B14.7%
GEV$108M+0.20B186.8%
APH$199M+0.18B93.6%

Losers

TickerPrev $PnLYoY %
PGR$431M-0.10B-25.5%
V$714M-0.09B-13.1%
MA$559M-0.05B-8.5%
SYK$345M-0.04B-11.1%
ICE$306M-0.02B-7.8%

Top buys this quarter · 15

PWR Quanta Services, Inc.+$80M
MDLN Medline Inc.+$50M
BA The Boeing Company+$48M
MCK McKesson Corporation+$44M
DOCN DigitalOcean Holdings, Inc.+$34M
TECH Bio-Techne Corporation+$33M
FNV Franco-Nevada Corporation+$32M
HEI HEICO Corporation+$29M
ATI ATI Inc.+$28M
FANG Diamondback Energy, Inc.+$28M

Top sells this quarter · 15

CWAN Clearwater Analytics Holdings,$78M
WDAY Workday, Inc.$75M
TYL Tyler Technologies, Inc.$64M
APP AppLovin Corporation$61M
UBER Uber Technologies, Inc.$58M
PCOR Procore Technologies, Inc.$55M
ADBE Adobe Inc.$46M
CSGP CoStar Group, Inc.$45M
NOW ServiceNow, Inc.$43M
INTU Intuit Inc.$39M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$34.73B1893+6.26%+17.59%-11.33%+0.39B
2025-12-31$37.10B1858+11.06%+17.72%-6.66%-0.16B
2025-09-30$37.37B1834+12.37%+17.52%-5.15%-0.10B
2025-06-30$35.81B1811+13.16%+14.94%-1.78%-0.45B
2025-03-31$32.96B1787+1.62%+8.30%-6.68%-0.14B
2024-12-31$34.21B1800+12.62%+24.89%-12.27%+0.02B
2024-09-30$33.89B1803+26.75%+36.04%-9.29%-0.19B
2024-06-30$32.34B1790+13.96%+24.49%-10.53%+0.92B
2024-03-31$31.81B1771+25.17%+29.62%-4.45%+0.38B
2023-12-31$29.31B1762+27.21%+26.18%+1.03%-0.25B
2023-09-30$26.04B1766+18.67%+21.57%-2.89%+0.22B
2023-06-30$27.25B1785+20.46%+19.42%+1.04%+0.14B
2023-03-31$24.99B1776-9.71%-7.82%-1.89%-0.02B
2022-12-31$22.94B1784-20.96%-18.17%-2.79%-0.05B
2022-09-30$21.71B1781-17.12%-15.51%-1.61%+0.08B
2022-06-30$22.50B1823-13.34%-10.62%-2.72%-0.68B