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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
+12.61%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+563.35%
AUM
$36B
AUM Growth
+$2.85B
Cap. Flow
-$222M
Cap. Flow %
-0.62%
Top 10 Hldgs %
24.91%
Holding
1,911
New
111
Increased
662
Reduced
757
Closed
87

Top Buys

Rank Stock Value
1
GEV icon
GE Vernova
GEV
+$116M
2
BA icon
Boeing
BA
+$34M
3
CWAN
Clearwater Analytics
CWAN
+$31.2M
4
NVDA icon
NVIDIA
NVDA
+$27.5M
5
NET icon
Cloudflare
NET
+$26.2M

Top Sells

Rank Stock Value
1
XYZ
Block Inc
XYZ
+$79.4M
2
ZTS icon
Zoetis
ZTS
+$41.3M
3
ACN icon
Accenture
ACN
+$40.8M
4
IJH icon
iShares Core S&P Mid-Cap ETF
IJH
+$40.7M
5
UNH icon
UnitedHealth
UNH
+$36.4M

Sector Composition

Rank Sector Weight
1 Technology 27.47%
2 Financials 13.92%
3 Industrials 12.94%
4 Healthcare 11.51%
5 Consumer Discretionary 7.98%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CASY icon
576
Casey's General Stores
CASY
$30.9B
$3.7M 0.01%
7,253
+153
+2% +$70.5K
SCHA icon
577
Schwab U.S Small- Cap ETF
SCHA
$23.1B
$3.7M 0.01%
146,149
-23,720
-14% -$561K
SPIB icon
578
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.5B
$3.68M 0.01%
109,588
-2,232
-2% -$73.9K
SUB icon
579
iShares Short-Term National Muni Bond ETF
SUB
$11.4B
$3.67M 0.01%
34,535
+1,721
+5% +$182K
AIR icon
580
AAR Corp
AIR
$5.76B
$3.65M 0.01%
52,990
+6,893
+15% +$414K
HOLX
581
DELISTED
Hologic
HOLX
$3.62M 0.01%
55,560
-16,259
-23% -$975K
LDOS icon
582
Leidos
LDOS
$17.3B
$3.62M 0.01%
22,941
-3,112
-12% -$460K
WEX icon
583
WEX
WEX
$6.31B
$3.59M 0.01%
24,426
-34,366
-58% -$4.62M
SPYG icon
584
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$54.5B
$3.57M 0.01%
37,495
-875
-2% -$75K
MOAT icon
585
VanEck Morningstar Wide Moat ETF
MOAT
$12.3B
$3.55M 0.01%
37,851
-2,937
-7% -$258K
EVR icon
586
Evercore
EVR
$11.8B
$3.54M 0.01%
13,115
+11,017
+525% +$2.42M
CAH icon
587
Cardinal Health
CAH
$55.4B
$3.52M 0.01%
20,968
+9,333
+80% +$1.39M
PHM icon
588
Pultegroup
PHM
$25.3B
$3.48M 0.01%
32,963
+663
+2% +$66.8K
ALNY icon
589
Alnylam Pharmaceuticals
ALNY
$29.3B
$3.45M 0.01%
10,592
-486
-4% -$134K
PHR icon
590
Phreesia
PHR
$773M
$3.45M 0.01%
121,308
-3,098
-2% -$78.6K
HCA icon
591
HCA Healthcare
HCA
$89.5B
$3.45M 0.01%
9,000
+425
+5% +$153K
ADSK icon
592
Autodesk
ADSK
$52.6B
$3.44M 0.01%
11,121
-126
-1% -$35.7K
HPQ icon
593
HP
HPQ
$27.5B
$3.44M 0.01%
140,652
-61,757
-31% -$1.57M
SJM icon
594
J.M. Smucker
SJM
$12.8B
$3.4M 0.01%
34,664
-9,710
-22% -$1.07M
ICLR icon
595
Icon
ICLR
$12.7B
$3.37M 0.01%
23,174
-1,204
-5% -$171K
QYLD icon
596
Global X NASDAQ-100 Covered Call ETF
QYLD
$8.26B
$3.36M 0.01%
201,173
-60,227
-23% -$984K
BDEC icon
597
Innovator US Equity Buffer ETF December
BDEC
$222M
$3.36M 0.01%
74,480
-4,210
-5% -$179K
DLB icon
598
Dolby
DLB
$5.79B
$3.36M 0.01%
45,286
-3,372
-7% -$252K
JAMF
599
DELISTED
Jamf
JAMF
$3.36M 0.01%
353,505
+102,943
+41% +$1.11M
DKS icon
600
Dick's Sporting Goods
DKS
$18.7B
$3.35M 0.01%
16,953
-651
-4% -$121K
22 23
24
25 26

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William Blair & Company's Q2 2025 Portfolio in Review

As of Q2 2025, William Blair & Company held 1,911 positions worth $36B, up 8.6% from $33.2B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company's Q2 2025 filing shows 111 new, 662 increased, 757 reduced and 87 closed positions. Its largest new stake was Affirm: 304,959 shares worth $21.1M. The largest sale was Block Inc, an estimated $79.4M.

By sector, the portfolio is most concentrated in Technology at 27% of assets, up from 26% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q2 2025 buy was Affirm: 304,959 shares worth $21.1M.
  • William Blair & Company added most to GE Vernova in Q2 2025, an estimated $116M increase.
  • William Blair & Company's biggest Q2 2025 reduction was Block Inc, cutting an estimated $79.4M.
  • William Blair & Company fully exited Discover Financial Services in Q2 2025, selling an estimated $5.21M.
  • William Blair & Company's ten largest holdings make up 25% of its $36B portfolio in Q2 2025.
  • William Blair & Company opened 111 new positions and closed 87 in Q2 2025.
  • William Blair & Company's portfolio value rose 8.6% quarter-over-quarter to $36B.

Based on William Blair & Company's 13F filing for Q2 2025, filed 24 Jul 2025.