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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+12.61%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
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
PINS icon
1876
Pinterest
PINS
$13.2B
– –
-28,551
Closed -$885K
RDFN
1877
DELISTED
Redfin
RDFN
– –
-76,288
Closed -$703K
REKR icon
1878
Rekor Systems
REKR
$98.2M
– –
-15,500
Closed -$13.7K
RLI icon
1879
RLI Corp
RLI
$5.87B
– –
-3,533
Closed -$284K
RNG icon
1880
RingCentral
RNG
$5.59B
– –
-10,234
Closed -$253K
SAP icon
1881
SAP
SAP
$240B
– –
-3,833
Closed -$1.03M
ECHO
1882
EchoStar
ECHO
$26.6B
– –
-13,058
Closed -$334K
SEAT icon
1883
Vivid Seats
SEAT
$83.3M
– –
-15
Closed -$888
SLQD icon
1884
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.38B
– –
-269
Closed -$13.5K
SLRN
1885
DELISTED
ACELYRIN
SLRN
– –
-138,595
Closed -$342K
SMFG icon
1886
Sumitomo Mitsui Financial
SMFG
$167B
– –
-24,467
Closed -$378K
SNY icon
1887
Sanofi
SNY
$105B
– –
-4,427
Closed -$246K
SPGP icon
1888
Invesco S&P 500 GARP ETF
SPGP
$2.33B
– –
-102
Closed -$10.2K
ST icon
1889
Sensata Technologies
ST
$6.59B
– –
-19,927
Closed -$484K
STEM icon
1890
Stem
STEM
$56.1M
– –
-593
Closed -$4.16K
SXI icon
1891
Standex International
SXI
$4B
– –
-1,251
Closed -$202K
TARS icon
1892
Tarsus Pharmaceuticals
TARS
$3.03B
– –
-11,416
Closed -$586K
TUR icon
1893
iShares MSCI Turkey ETF
TUR
$221M
– –
-15
Closed -$492
UCTT
1894
Ultra Clean Holdings
UCTT
$4.26B
– –
-22,100
Closed -$473K
UUP icon
1895
Invesco DB US Dollar Index Bullish Fund
UUP
$415M
– –
-14,290
Closed -$408K
VIGL
1896
DELISTED
Vigil Neuroscience
VIGL
– –
-1,033,577
Closed -$1.84M
VYX icon
1897
NCR Voyix
VYX
$1.16B
– –
-81,215
Closed -$2.59M
WMG icon
1898
Warner Music
WMG
$13.2B
– –
-8,575
Closed -$269K
WW
1899
DELISTED
WW International
WW
– –
-13,145
Closed -$6.87K
X
1900
DELISTED
US Steel
X
– –
-47,207
Closed -$1.99M
73 74 75
76
77

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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.