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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SUNB
926
Sunbelt Rentals Holdings
SUNB
$30.1B
$1.05M ﹤0.01%
+16,200
New +$1.14M
REGN icon
927
Regeneron Pharmaceuticals
REGN
$72.9B
$1.05M ﹤0.01%
1,364
+66
+5% +$50.5K
WING icon
928
Wingstop
WING
$3.8B
$1.04M ﹤0.01%
6,737
-84,036
-93% -$20.2M
DEO icon
929
Diageo
DEO
$49.6B
$1.04M ﹤0.01%
14,000
-2,231
-14% -$195K
VTES icon
930
Vanguard Short-Term Tax-Exempt Bond ETF
VTES
$2.08B
$1.04M ﹤0.01%
10,292
-562
-5% -$57.3K
PINE
931
Alpine Income Property Trust
PINE
$336M
$1.04M ﹤0.01%
+57,515
New +$1.07M
QXO
932
QXO Inc
QXO
$13.9B
$1.04M ﹤0.01%
53,309
-19,614
-27% -$449K
XRAY icon
933
Dentsply Sirona
XRAY
$2.84B
$1.03M ﹤0.01%
89,164
-287
-0.3% -$3.58K
XAR icon
934
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.78B
$1.03M ﹤0.01%
4,067
+1,736
+74% +$475K
UFPI icon
935
UFP Industries
UFPI
$4.95B
$1.03M ﹤0.01%
11,182
+116
+1% +$11.7K
FALN icon
936
iShares Fallen Angels USD Bond ETF
FALN
$1.63B
$1.03M ﹤0.01%
38,507
-616
-2% -$16.8K
DTM icon
937
DT Midstream
DTM
$13.9B
$1.02M ﹤0.01%
7,578
+626
+9% +$81.6K
DFTX
938
Definium Therapeutics
DFTX
$5.6B
$1.01M ﹤0.01%
+53,695
New +$911K
IQV icon
939
IQVIA
IQV
$40.7B
$1.01M ﹤0.01%
5,936
-2,046
-26% -$399K
SCHE icon
940
Schwab Emerging Markets Equity ETF
SCHE
$12.2B
$1.01M ﹤0.01%
30,714
+5,594
+22% +$191K
FLJP icon
941
Franklin FTSE Japan ETF
FLJP
$3.86B
$1.01M ﹤0.01%
27,861
+17,870
+179% +$661K
ATMP icon
942
iPath Select MLP ETN
ATMP
$635M
$1M ﹤0.01%
29,087
+3,600
+14% +$116K
CORZW icon
943
Core Scientific Inc Tranche 1 Warrants
CORZW
$1.13B
$1M ﹤0.01%
114,509
– –
DAL icon
944
Delta Air Lines
DAL
$56.7B
$1,000K ﹤0.01%
15,038
-6,732
-31% -$453K
SAN icon
945
Banco Santander
SAN
$191B
$999K ﹤0.01%
88,547
+73,751
+498% +$879K
AOM icon
946
iShares Core Moderate Allocation ETF
AOM
$1.74B
$994K ﹤0.01%
+20,981
New +$1.01M
APG icon
947
APi Group
APG
$16.7B
$991K ﹤0.01%
24,447
-3,833
-14% -$163K
JBTM
948
JBT Marel
JBTM
$7.35B
$986K ﹤0.01%
7,708
-1,135
-13% -$172K
PKG icon
949
Packaging Corp of America
PKG
$22.2B
$981K ﹤0.01%
4,621
+1,329
+40% +$296K
VGSH icon
950
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
$976K ﹤0.01%
16,681
-2,599
-13% -$153K
36 37
38
39 40

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.