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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
RPM icon
776
RPM International
RPM
$13.8B
$1.73M 0.01%
17,433
-300
-2% -$32.4K
TREX icon
777
Trex
TREX
$4.4B
$1.73M 0.01%
47,554
-83,661
-64% -$3.37M
NTAP icon
778
NetApp
NTAP
$33.9B
$1.7M ﹤0.01%
16,648
-3,579
-18% -$363K
MLI icon
779
Mueller Industries
MLI
$14.5B
$1.7M ﹤0.01%
30,680
+570
+2% +$34.2K
VOOG icon
780
Vanguard S&P 500 Growth ETF
VOOG
$24.7B
$1.69M ﹤0.01%
24,894
+3,804
+18% +$275K
LGND icon
781
Ligand Pharmaceuticals
LGND
$5.77B
$1.69M ﹤0.01%
8,454
-20
-0.2% -$3.96K
EQWL icon
782
Invesco S&P 100 Equal Weight ETF
EQWL
$2.69B
$1.69M ﹤0.01%
14,628
+8,151
+126% +$976K
RAL
783
Ralliant Corp
RAL
$7.5B
$1.68M ﹤0.01%
40,473
-9,434
-19% -$444K
CCC
784
CCC Intelligent Solutions
CCC
$3.55B
$1.68M ﹤0.01%
280,015
-107,849
-28% -$706K
STVN icon
785
Stevanato
STVN
$5.57B
$1.68M ﹤0.01%
122,038
-23,155
-16% -$384K
GKOS icon
786
Glaukos
GKOS
$9.49B
$1.68M ﹤0.01%
15,585
+1,127
+8% +$127K
PFF icon
787
iShares Preferred and Income Securities ETF
PFF
$13.1B
$1.67M ﹤0.01%
55,117
+5,760
+12% +$180K
ESGU icon
788
iShares ESG Aware MSCI USA ETF
ESGU
$17.5B
$1.66M ﹤0.01%
11,764
-783
-6% -$116K
BBCA icon
789
JPMorgan BetaBuilders Canada ETF
BBCA
$10.9B
$1.66M ﹤0.01%
17,639
+1,709
+11% +$163K
VV icon
790
Vanguard Large-Cap ETF
VV
$51.2B
$1.66M ﹤0.01%
5,550
-149
-3% -$46.6K
STX icon
791
Seagate
STX
$173B
$1.65M ﹤0.01%
4,222
+943
+29% +$360K
WWD icon
792
Woodward
WWD
$23B
$1.65M ﹤0.01%
4,616
+645
+16% +$232K
CRWV
793
CoreWeave
CRWV
$33.2B
$1.64M ﹤0.01%
21,156
-5,010
-19% -$435K
CLBT icon
794
Cellebrite
CLBT
$3.76B
$1.62M ﹤0.01%
117,645
+26,058
+28% +$393K
NVO
795
Novo Nordisk
NVO
$228B
$1.62M ﹤0.01%
44,012
-2,258
-5% -$107K
PMAY icon
796
Innovator US Equity Power Buffer ETF May
PMAY
$802M
$1.61M ﹤0.01%
40,327
-7,394
-15% -$294K
APEI icon
797
American Public Education
APEI
$940M
$1.6M ﹤0.01%
28,080
-3,948
-12% -$181K
BBEU icon
798
JPMorgan BetaBuilders Europe ETF
BBEU
$9.17B
$1.59M ﹤0.01%
21,979
+381
+2% +$28.7K
SPSB icon
799
State Street SPDR Portfolio Short Term Corporate Bond ETF
SPSB
$10.4B
$1.59M ﹤0.01%
52,838
+1,761
+3% +$53.2K
BSY icon
800
Bentley Systems
BSY
$11.2B
$1.59M ﹤0.01%
45,230
+12,318
+37% +$453K
30 31
32
33 34

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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.