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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
DOCS icon
626
Doximity
DOCS
$3.89B
$3M 0.01%
128,753
-10,516
-8% -$328K
FCX icon
627
Freeport-McMoran
FCX
$86.2B
$2.99M 0.01%
50,799
+394
+0.8% +$23.8K
BIP icon
628
Brookfield Infrastructure Partners
BIP
$19.6B
$2.96M 0.01%
81,834
+7,716
+10% +$283K
PLD icon
629
Prologis
PLD
$136B
$2.95M 0.01%
22,297
+4,482
+25% +$599K
CAVA icon
630
CAVA Group
CAVA
$7.61B
$2.95M 0.01%
36,425
-7,746
-18% -$565K
SCHO icon
631
Schwab Short-Term US Treasury ETF
SCHO
$12.8B
$2.93M 0.01%
120,887
+2,314
+2% +$56.3K
III icon
632
Information Services Group
III
$204M
$2.93M 0.01%
763,637
-16,140
-2% -$79.4K
PRI icon
633
Primerica
PRI
$10.1B
$2.93M 0.01%
11,695
-127
-1% -$32.8K
LFUS icon
634
Littelfuse
LFUS
$10.4B
$2.92M 0.01%
8,601
+453
+6% +$147K
WEX icon
635
WEX
WEX
$6.42B
$2.88M 0.01%
18,844
-2,660
-12% -$416K
AIOT
636
PowerFleet Inc
AIOT
$537M
$2.88M 0.01%
935,372
+195,250
+26% +$818K
ENVX icon
637
Enovix
ENVX
$803M
$2.87M 0.01%
554,234
+17,081
+3% +$107K
VGIT icon
638
Vanguard Intermediate-Term Treasury ETF
VGIT
$41.7B
$2.85M 0.01%
47,843
+3,863
+9% +$231K
GDYN icon
639
Grid Dynamics Holdings
GDYN
$569M
$2.85M 0.01%
499,355
-157,977
-24% -$1.16M
PFXF icon
640
VanEck Preferred Securities ex Financials ETF
PFXF
$2.37B
$2.84M 0.01%
161,661
-1,734
-1% -$31.4K
SNA icon
641
Snap-on
SNA
$21.5B
$2.83M 0.01%
7,803
+4
+0.1% +$1.48K
PRAA icon
642
PRA Group
PRAA
$672M
$2.83M 0.01%
161,809
-44,432
-22% -$676K
PDP icon
643
Invesco Dorsey Wright Momentum ETF
PDP
$1.38B
$2.83M 0.01%
23,415
-500
-2% -$62K
HTGC icon
644
Hercules Capital
HTGC
$2.99B
$2.82M 0.01%
191,193
-4,400
-2% -$71.9K
RY icon
645
Royal Bank of Canada
RY
$287B
$2.82M 0.01%
17,448
-1,105
-6% -$185K
D icon
646
Dominion Energy
D
$62B
$2.81M 0.01%
45,406
+571
+1% +$35.3K
USD icon
647
ProShares Ultra Semiconductors
USD
$2.13B
$2.8M 0.01%
58,407
-1,875
-3% -$102K
ACWI icon
648
iShares MSCI ACWI ETF
ACWI
$32B
$2.78M 0.01%
20,125
+630
+3% +$90.6K
DDOG icon
649
Datadog
DDOG
$94B
$2.78M 0.01%
23,516
-8,371
-26% -$1.03M
IWY icon
650
iShares Russell Top 200 Growth ETF
IWY
$15.2B
$2.76M 0.01%
11,107
-719
-6% -$190K
24 25
26
27 28

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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.