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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
INCY icon
1301
Incyte
INCY
$25.4B
$326K ﹤0.01%
+3,465
New +$346K
BMNR
1302
BitMine Immersion Technologies
BMNR
$10B
$326K ﹤0.01%
16,483
-1,182
-7% -$27.8K
NWG icon
1303
NatWest
NWG
$69.9B
$326K ﹤0.01%
21,848
+5,260
+32% +$87.4K
SQM icon
1304
Sociedad Química y Minera de Chile
SQM
$19.3B
$324K ﹤0.01%
+4,006
New +$305K
GRBK icon
1305
Green Brick Partners
GRBK
$3.09B
$324K ﹤0.01%
5,022
-83
-2% -$5.84K
PCG icon
1306
PG&E
PCG
$39B
$321K ﹤0.01%
18,281
+5,319
+41% +$90.5K
BFLY icon
1307
Butterfly Network
BFLY
$1.86B
$321K ﹤0.01%
79,500
-50,000
-39% -$193K
GAP
1308
The Gap Inc
GAP
$7.3B
$321K ﹤0.01%
13,269
+442
+3% +$11.7K
LEG icon
1309
Leggett & Platt
LEG
$1.4B
$320K ﹤0.01%
32,437
+369
+1% +$4.21K
R icon
1310
Ryder
R
$9.9B
$320K ﹤0.01%
1,563
+59
+4% +$11.9K
WCC
1311
WESCO International
WCC
$15.1B
$319K ﹤0.01%
1,165
+45
+4% +$12.6K
H icon
1312
Hyatt Hotels
H
$17.5B
$319K ﹤0.01%
2,216
+947
+75% +$150K
FRT icon
1313
Federal Realty Investment Trust
FRT
$10.9B
$318K ﹤0.01%
2,998
+238
+9% +$24.9K
FCBC icon
1314
First Community Bankshares
FCBC
$899M
$318K ﹤0.01%
7,662
+7
+0.1% +$267
FDL icon
1315
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.89B
$317K ﹤0.01%
6,241
-21
-0.3% -$1.03K
IQLT icon
1316
iShares MSCI Intl Quality Factor ETF
IQLT
$13.6B
$317K ﹤0.01%
6,854
-1,546
-18% -$73.1K
FAF icon
1317
First American
FAF
$7.98B
$317K ﹤0.01%
5,255
-39
-0.7% -$2.5K
AROC icon
1318
Archrock
AROC
$6.16B
$317K ﹤0.01%
+9,096
New +$290K
DAR icon
1319
Darling Ingredients
DAR
$9.32B
$316K ﹤0.01%
+5,115
New +$252K
SSB icon
1320
SouthState Bank Corp
SSB
$10.3B
$316K ﹤0.01%
3,412
+260
+8% +$25.5K
ENSG icon
1321
The Ensign Group
ENSG
$10.6B
$316K ﹤0.01%
1,566
-35
-2% -$6.85K
ALLE icon
1322
Allegion
ALLE
$13.5B
$315K ﹤0.01%
2,169
-142
-6% -$22.6K
EWBC icon
1323
East-West Bancorp
EWBC
$17.8B
$315K ﹤0.01%
2,950
+361
+14% +$40.7K
SYF icon
1324
Synchrony
SYF
$24.4B
$314K ﹤0.01%
4,616
-2,295
-33% -$167K
JMUB icon
1325
JPMorgan Municipal ETF
JMUB
$8.32B
$313K ﹤0.01%
6,254
-4,087
-40% -$207K
51 52
53
54 55

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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.