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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
LONA
1751
LeonaBio Inc
LONA
$73.4M
$6.04K ﹤0.01%
2,000
– –
HYLS icon
1752
First Trust Exchange-Traded Fund IV First Trust Tactical High Yield ETF
HYLS
$1.63B
$5.94K ﹤0.01%
142
+96
+209% +$3.95K
SGMO
1753
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
$5.41K ﹤0.01%
10,000
-500
-5% -$297
LEGR icon
1754
First Trust Indxx Innovative Transaction & Process ETF
LEGR
$132M
$5.38K ﹤0.01%
100
– –
AIA icon
1755
iShares Asia 50 ETF
AIA
$4.7B
$5.35K ﹤0.01%
66
– –
TBT icon
1756
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$314M
$5.26K ﹤0.01%
150
– –
RSPS icon
1757
Invesco S&P 500 Equal Weight Consumer Staples ETF
RSPS
$256M
$5.25K ﹤0.01%
175
– –
WOLF icon
1758
Wolfspeed
WOLF
$1.43B
$5.12K ﹤0.01%
12,830
-1,192
-9% -$2.72K
GCMGW
1759
DELISTED
GCM Grosvenor Inc Warrant
GCMGW
$5.05K ﹤0.01%
7,895
-500
-6% -$578
PJP icon
1760
Invesco Pharmaceuticals ETF
PJP
$477M
$4.79K ﹤0.01%
60
– –
OIH icon
1761
VanEck Oil Services ETF
OIH
$1.94B
$4.79K ﹤0.01%
21
-49
-70% -$11K
LNAI
1762
Lunai Bioworks
LNAI
$11M
$4.65K ﹤0.01%
201
– –
QLTA icon
1763
iShares AAA-A Rated Corporate Bond ETF
QLTA
$1.23B
$4.64K ﹤0.01%
+97
New +$4.57K
EWN icon
1764
iShares MSCI Netherlands ETF
EWN
$630M
$4.63K ﹤0.01%
85
+57
+204% +$2.88K
DSTL icon
1765
Distillate US Fundamental Stability & Value ETF
DSTL
$2.02B
$4.52K ﹤0.01%
82
+1
+1% +$53
EWQ icon
1766
iShares MSCI France ETF
EWQ
$343M
$4.32K ﹤0.01%
101
– –
LBRDA icon
1767
Liberty Broadband Class A
LBRDA
$5.32B
$4.3K ﹤0.01%
44
– –
INTF icon
1768
iShares International Equity Factor ETF
INTF
$3.68B
$4.28K ﹤0.01%
125
– –
PSL icon
1769
Invesco Dorsey Wright Consumer Staples Momentum ETF
PSL
$84.8M
$4.09K ﹤0.01%
37
– –
ENZL icon
1770
iShares MSCI New Zealand ETF
ENZL
$83.5M
$4.06K ﹤0.01%
+89
New +$3.93K
CMBM
1771
DELISTED
Cambium Networks
CMBM
$4.05K ﹤0.01%
10,000
– –
EINC icon
1772
VanEck Energy Income ETF
EINC
$81.5M
$3.75K ﹤0.01%
38
– –
PZA icon
1773
Invesco National AMT-Free Municipal Bond ETF
PZA
$4.25B
$3.72K ﹤0.01%
+166
New +$3.73K
XRT icon
1774
State Street SPDR S&P Retail ETF
XRT
$323M
$3.62K ﹤0.01%
47
-2,802
-98% -$203K
DFNM icon
1775
Dimensional National Municipal Bond ETF
DFNM
$2.24B
$3.6K ﹤0.01%
76
-6
-7% -$284
69 70
71
72 73

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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.