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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
ARM icon
676
Arm
ARM
$240B
$2.43M 0.01%
16,047
+3,051
+23% +$370K
LSTR icon
677
Landstar System
LSTR
$6.03B
$2.43M 0.01%
15,128
+45
+0.3% +$6.91K
NTNX icon
678
Nutanix
NTNX
$16.1B
$2.4M 0.01%
63,115
-26,211
-29% -$1.1M
BY icon
679
Byline Bancorp
BY
$1.78B
$2.4M 0.01%
75,986
-6,953
-8% -$218K
PRU icon
680
Prudential Financial
PRU
$42.6B
$2.38M 0.01%
24,382
-1,131
-4% -$117K
DHS icon
681
WisdomTree US High Dividend Fund
DHS
$1.58B
$2.38M 0.01%
21,795
-150
-0.7% -$16.3K
CHKP icon
682
Check Point Software Technologies
CHKP
$14.3B
$2.38M 0.01%
16,641
-3,913
-19% -$655K
PNOV icon
683
Innovator US Equity Power Buffer ETF November
PNOV
$874M
$2.37M 0.01%
57,890
-1,095
-2% -$45.7K
DFUV icon
684
Dimensional US Marketwide Value ETF
DFUV
$15.3B
$2.36M 0.01%
48,777
+3,642
+8% +$179K
BIIB icon
685
Biogen
BIIB
$30.9B
$2.36M 0.01%
12,854
+4,411
+52% +$813K
EXC icon
686
Exelon
EXC
$48.1B
$2.35M 0.01%
47,862
+2,858
+6% +$133K
CCI icon
687
Crown Castle
CCI
$34.6B
$2.33M 0.01%
28,615
-1,075
-4% -$92.5K
ASTS icon
688
AST SpaceMobile
ASTS
$15.8B
$2.33M 0.01%
28,060
-2,526
-8% -$238K
SUSA icon
689
iShares ESG Optimized MSCI USA ETF
SUSA
$3.95B
$2.32M 0.01%
17,538
-926
-5% -$128K
JCI icon
690
Johnson Controls International
JCI
$85.1B
$2.32M 0.01%
17,681
+8,516
+93% +$1.1M
IT icon
691
Gartner
IT
$11.1B
$2.3M 0.01%
14,506
-108,046
-88% -$19.9M
HYMB icon
692
State Street SPDR Nuveen ICE High Yield Municipal Bond ETF
HYMB
$3.1B
$2.3M 0.01%
92,597
+1,320
+1% +$33.1K
CAH icon
693
Cardinal Health
CAH
$53.7B
$2.29M 0.01%
10,852
-8,171
-43% -$1.76M
RH icon
694
RH
RH
$3.33B
$2.29M 0.01%
16,399
-403
-2% -$73.4K
JBL icon
695
Jabil
JBL
$30.1B
$2.28M 0.01%
8,601
+793
+10% +$200K
CAG icon
696
Conagra Brands
CAG
$7.42B
$2.27M 0.01%
144,502
-354
-0.2% -$6.25K
SCHA icon
697
Schwab U.S Small- Cap ETF
SCHA
$21.8B
$2.26M 0.01%
77,548
-9,200
-11% -$276K
IVOO icon
698
Vanguard S&P Mid-Cap 400 ETF
IVOO
$3.68B
$2.25M 0.01%
19,674
+17,143
+677% +$2.01M
RIG icon
699
Transocean
RIG
$5.48B
$2.25M 0.01%
338,803
+21,689
+7% +$122K
VDE icon
700
Vanguard Energy ETF
VDE
$9.9B
$2.25M 0.01%
12,975
-205
-2% -$31K
26 27
28
29 30

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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.