We are live on ! Find out more
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
ISTB icon
1126
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.11B
$531K ﹤0.01%
10,961
-366
-3% -$17.8K
MBB icon
1127
iShares MBS ETF
MBB
$39.1B
$531K ﹤0.01%
5,593
-207
-4% -$19.8K
KTOS icon
1128
Kratos Defense & Security Solutions
KTOS
$8.23B
$530K ﹤0.01%
7,512
+2,975
+66% +$285K
EVRG icon
1129
Evergy
EVRG
$19.4B
$529K ﹤0.01%
6,456
-660
-9% -$52.2K
ONEQ icon
1130
Fidelity Nasdaq Composite Index ETF
ONEQ
$9.97B
$526K ﹤0.01%
6,195
+447
+8% +$40.1K
EFAV icon
1131
iShares MSCI EAFE Min Vol Factor ETF
EFAV
$5.35B
$525K ﹤0.01%
5,746
-123
-2% -$11.1K
MDGL icon
1132
Madrigal Pharmaceuticals
MDGL
$12.6B
$524K ﹤0.01%
1,001
+1
+0.1% +$478
ALRM icon
1133
Alarm.com
ALRM
$2.75B
$521K ﹤0.01%
12,066
+104
+0.9% +$4.96K
MAX icon
1134
MediaAlpha
MAX
$746M
$521K ﹤0.01%
55,975
-4,171
-7% -$41.1K
MSCI icon
1135
MSCI
MSCI
$42.4B
$520K ﹤0.01%
964
+424
+79% +$239K
NBIX icon
1136
Neurocrine Biosciences
NBIX
$18.2B
$520K ﹤0.01%
3,945
-555
-12% -$73.6K
TENB icon
1137
Tenable Holdings
TENB
$3.47B
$518K ﹤0.01%
30,623
-112
-0.4% -$2.35K
HBNC icon
1138
Horizon Bancorp
HBNC
$1.06B
$517K ﹤0.01%
31,219
+19
+0.1% +$325
GEW
1139
Cambria Global EW ETF
GEW
$140M
$517K ﹤0.01%
10,250
– –
RDDT icon
1140
Reddit
RDDT
$34.3B
$517K ﹤0.01%
3,836
+234
+6% +$39.8K
EQPT
1141
EquipmentShare.com Inc
EQPT
$4.53B
$516K ﹤0.01%
+25,345
New +$725K
HLN icon
1142
Haleon
HLN
$45.3B
$515K ﹤0.01%
51,469
-173
-0.3% -$1.8K
SRBK icon
1143
SR Bancorp
SRBK
$144M
$515K ﹤0.01%
+30,499
New +$513K
QBTS icon
1144
D-Wave Quantum Inc. Common Stock
QBTS
$5.99B
$514K ﹤0.01%
35,592
-6,307
-15% -$133K
AIZ icon
1145
Assurant
AIZ
$13.9B
$512K ﹤0.01%
2,350
-346
-13% -$78.9K
HDB icon
1146
HDFC Bank
HDB
$123B
$511K ﹤0.01%
20,556
+1,059
+5% +$32.9K
FE icon
1147
FirstEnergy
FE
$28.4B
$511K ﹤0.01%
10,080
+1,032
+11% +$50.1K
SLF icon
1148
Sun Life Financial
SLF
$45.6B
$509K ﹤0.01%
8,142
-2,121
-21% -$136K
SCCO icon
1149
Southern Copper
SCCO
$138B
$507K ﹤0.01%
+2,974
New +$544K
OBDC icon
1150
Blue Owl Capital
OBDC
$5.35B
$507K ﹤0.01%
45,813
+743
+2% +$8.72K
44 45
46
47 48

Similar funds

SAM
Storebrand Asset Management Lysaker, Norway $34.8B AUM 25.49% 1-Year Est. Return
Daiwa Securities Group
Daiwa Securities Group Tokyo, Japan $34.8B AUM 20.7% 1-Year Est. Return
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
Pacer Advisors
Pacer Advisors Malvern, Pennsylvania $35.6B AUM 18.19% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return

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.