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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
EPAM icon
551
EPAM Systems
EPAM
$5.03B
$4.03M 0.01%
22,799
+12,245
+116% +$2.05M
KKR icon
552
KKR & Co
KKR
$92.3B
$4.03M 0.01%
30,286
-799
-3% -$93.5K
KDEC
553
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$73.5M
$4.03M 0.01%
167,601
-450
-0.3% -$10.4K
U icon
554
Unity
U
$18.9B
$4.01M 0.01%
165,657
+10,699
+7% +$235K
CFLT
555
DELISTED
Confluent
CFLT
$4M 0.01%
160,575
+12,654
+9% +$285K
IWY icon
556
iShares Russell Top 200 Growth ETF
IWY
$16.6B
$4M 0.01%
16,221
-303
-2% -$67.4K
MUB icon
557
iShares National Muni Bond ETF
MUB
$45.5B
$3.99M 0.01%
38,184
+3,958
+12% +$412K
QQQM icon
558
Invesco NASDAQ 100 ETF
QQQM
$102B
$3.97M 0.01%
17,499
+1,179
+7% +$241K
CACI icon
559
CACI
CACI
$14.2B
$3.97M 0.01%
8,323
+587
+8% +$260K
VGK icon
560
Vanguard FTSE Europe ETF
VGK
$31.4B
$3.96M 0.01%
51,096
+16,121
+46% +$1.19M
AIOT
561
PowerFleet Inc
AIOT
$592M
$3.96M 0.01%
917,858
-84,791
-8% -$419K
CCI icon
562
Crown Castle
CCI
$32.2B
$3.94M 0.01%
38,338
-8,143
-18% -$824K
DDOG icon
563
Datadog
DDOG
$84B
$3.92M 0.01%
29,206
+751
+3% +$83.1K
ROKU icon
564
Roku
ROKU
$22.7B
$3.9M 0.01%
44,412
-1,315
-3% -$91.9K
WMB icon
565
Williams Companies
WMB
$86.1B
$3.89M 0.01%
62,003
-607
-1% -$35.8K
RELY icon
566
Remitly
RELY
$5.14B
$3.89M 0.01%
207,255
-28,279
-12% -$588K
PJUN icon
567
Innovator US Equity Power Buffer ETF June
PJUN
$975M
$3.89M 0.01%
97,837
-59,962
-38% -$2.26M
WSM icon
568
Williams-Sonoma
WSM
$29.6B
$3.86M 0.01%
23,633
-639
-3% -$100K
RH icon
569
RH
RH
$3.71B
$3.82M 0.01%
20,216
+853
+4% +$158K
QNST icon
570
QuinStreet
QNST
$1.21B
$3.81M 0.01%
236,574
-7,101
-3% -$114K
LPLA icon
571
LPL Financial
LPLA
$28.6B
$3.81M 0.01%
10,148
-10,290
-50% -$3.61M
STVN icon
572
Stevanato
STVN
$5.54B
$3.79M 0.01%
155,148
-3,884
-2% -$87.8K
KRE icon
573
State Street SPDR S&P Regional Banking ETF
KRE
$4.64B
$3.79M 0.01%
63,751
+1,621
+3% +$90.3K
HTGC icon
574
Hercules Capital
HTGC
$3.23B
$3.71M 0.01%
203,205
+3,205
+2% +$56.8K
KAI icon
575
Kadant
KAI
$3.99B
$3.71M 0.01%
11,673
+40
+0.3% +$12.5K
21 22
23
24 25

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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.