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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
GEF.B icon
1651
Greif Class B
GEF.B
$4.21B
$27.6K ﹤0.01%
400
– –
LIT icon
1652
Global X Lithium & Battery Tech ETF
LIT
$1.6B
$26.4K ﹤0.01%
687
-1,085
-61% -$40.1K
IVOO icon
1653
Vanguard S&P Mid-Cap 400 ETF
IVOO
$3.83B
$26.4K ﹤0.01%
251
-200
-44% -$19.9K
MXI icon
1654
iShares Global Materials ETF
MXI
$362M
$25.6K ﹤0.01%
300
– –
PBE icon
1655
Invesco Biotechnology & Genome ETF
PBE
$292M
$25.6K ﹤0.01%
400
– –
IXG icon
1656
iShares Global Financials ETF
IXG
$687M
$25.5K ﹤0.01%
230
– –
OUSA icon
1657
ALPS O'Shares U.S. Quality Dividend ETF
OUSA
$764M
$25.3K ﹤0.01%
469
+2
+0.4% +$105
UAA icon
1658
Under Armour
UAA
$2.6B
$25.1K ﹤0.01%
3,674
-1,467
-29% -$9.13K
TDOC icon
1659
Teladoc Health
TDOC
$1.3B
$25K ﹤0.01%
2,874
-3,721
-56% -$27K
AAXJ icon
1660
iShares MSCI All Country Asia ex Japan ETF
AAXJ
$3.77B
$24.5K ﹤0.01%
296
– –
XTL icon
1661
State Street SPDR S&P Telecom ETF
XTL
$586M
$24.2K ﹤0.01%
206
– –
IAK icon
1662
iShares US Insurance ETF
IAK
$540M
$23.8K ﹤0.01%
177
+155
+705% +$20.6K
IRD
1663
Opus Genetics
IRD
$302M
$23K ﹤0.01%
24,466
– –
BWX icon
1664
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.32B
$22.5K ﹤0.01%
959
+143
+18% +$3.27K
SPLB icon
1665
State Street SPDR Portfolio Long Term Corporate Bond ETF
SPLB
$1.17B
$22.4K ﹤0.01%
+994
New +$21.8K
SOCL icon
1666
Global X Social Media ETF
SOCL
$93.4M
$22.2K ﹤0.01%
415
-52
-11% -$2.39K
DTH icon
1667
WisdomTree International High Dividend Fund
DTH
$663M
$21.7K ﹤0.01%
468
– –
RWX icon
1668
State Street SPDR Dow Jones International Real Estate ETF
RWX
$270M
$21.5K ﹤0.01%
785
-694
-47% -$18.1K
WTV icon
1669
WisdomTree US Value Fund
WTV
$3.36B
$21.1K ﹤0.01%
244
+100
+69% +$8.16K
IFGL icon
1670
iShares International Developed Real Estate ETF
IFGL
$83.2M
$21K ﹤0.01%
923
– –
HTZWW
1671
Hertz Global Holdings Warrants
HTZWW
$95.5M
$20.4K ﹤0.01%
5,602
– –
IHF icon
1672
iShares US Healthcare Providers ETF
IHF
$1.27B
$20.2K ﹤0.01%
415
– –
HLLY.WS
1673
DELISTED
Holley Inc Warrants
HLLY.WS
$19.8K ﹤0.01%
401,489
– –
IBTF
1674
DELISTED
iShares iBonds Dec 2025 Term Treasury ETF
IBTF
$19.4K ﹤0.01%
831
-898
-52% -$21K
XSW icon
1675
State Street SPDR S&P Software & Services ETF
XSW
$484M
$19K ﹤0.01%
100
– –
65 66
67
68 69

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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.