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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
NEAR icon
1476
iShares Short Maturity Bond ETF
NEAR
$4.82B
$203K ﹤0.01%
3,997
– –
CSL icon
1477
Carlisle Companies
CSL
$13.6B
$203K ﹤0.01%
+609
New +$222K
UUP icon
1478
Invesco DB US Dollar Index Bullish Fund
UUP
$423M
$203K ﹤0.01%
+7,295
New +$199K
CNP icon
1479
CenterPoint Energy
CNP
$28.3B
$202K ﹤0.01%
+4,686
New +$193K
PNR icon
1480
Pentair
PNR
$10.8B
$202K ﹤0.01%
2,321
-577
-20% -$56.5K
BXMT icon
1481
Blackstone Mortgage Trust
BXMT
$2.77B
$202K ﹤0.01%
10,550
+168
+2% +$3.24K
RSPH icon
1482
Invesco S&P 500 Equal Weight Health Care ETF
RSPH
$774M
$201K ﹤0.01%
6,664
– –
PIPR icon
1483
Piper Sandler
PIPR
$4.98B
$201K ﹤0.01%
2,628
– –
XVV icon
1484
iShares ESG Screened S&P 500 ETF
XVV
$634M
$200K ﹤0.01%
4,073
– –
CHYM
1485
Chime Financial
CHYM
$8.54B
$200K ﹤0.01%
10,689
+1,880
+21% +$42.6K
BBAI icon
1486
BigBear.ai
BBAI
$1.25B
$200K ﹤0.01%
56,834
-2,096
-4% -$9.73K
EG icon
1487
Everest Group
EG
$15.6B
$200K ﹤0.01%
612
-161
-21% -$53K
SPAB icon
1488
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$9.77B
$200K ﹤0.01%
7,808
-2,351
-23% -$60.7K
QLD icon
1489
ProShares Ultra QQQ
QLD
$11.7B
$200K ﹤0.01%
3,272
– –
QUS icon
1490
State Street SPDR MSCI USA StrategicFactors ETF
QUS
$1.52B
$199K ﹤0.01%
1,157
– –
SPTM icon
1491
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$13.3B
$198K ﹤0.01%
2,510
-400
-14% -$33K
PNW icon
1492
Pinnacle West Capital
PNW
$12.4B
$198K ﹤0.01%
+1,968
New +$190K
FTC icon
1493
First Trust Large Cap Growth AlphaDEX Fund
FTC
$1.26B
$197K ﹤0.01%
1,275
– –
EUSA icon
1494
iShares MSCI USA Equal Weighted ETF
EUSA
$1.82B
$196K ﹤0.01%
1,925
– –
COPX icon
1495
Global X Copper Miners ETF NEW
COPX
$7.03B
$195K ﹤0.01%
+2,559
New +$212K
SCHK icon
1496
Schwab 1000 Index ETF
SCHK
$5.59B
$192K ﹤0.01%
6,124
– –
CNYA icon
1497
iShares MSCI China A ETF
CNYA
$199M
$190K ﹤0.01%
5,573
– –
MTH icon
1498
Meritage Homes
MTH
$4.77B
$190K ﹤0.01%
3,070
-28
-0.9% -$1.98K
IYG icon
1499
iShares US Financial Services ETF
IYG
$2.14B
$189K ﹤0.01%
2,282
– –
SOUN icon
1500
SoundHound AI
SOUN
$2.49B
$189K ﹤0.01%
27,496
+12,000
+77% +$104K
58 59
60
61 62

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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.