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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
BFEB icon
951
Innovator US Equity Buffer ETF February
BFEB
$259M
$831K ﹤0.01%
18,621
-58,875
-76% -$2.48M
SSO icon
952
ProShares Ultra S&P500
SSO
$8.36B
$831K ﹤0.01%
17,014
– –
DBEF icon
953
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.39B
$830K ﹤0.01%
18,972
-391
-2% -$17K
IGV icon
954
iShares Expanded Tech-Software Sector ETF
IGV
$14.5B
$829K ﹤0.01%
7,571
+23
+0.3% +$2.27K
PDBC icon
955
Invesco Actively Managed Exch-Traded Commodity Fd Tr Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF
PDBC
$6.3B
$827K ﹤0.01%
63,431
-1,440
-2% -$18.6K
GBIL icon
956
Goldman Sachs Access Treasury 0-1 Year ETF
GBIL
$7.58B
$811K ﹤0.01%
8,099
+79
+1% +$7.9K
SLDB icon
957
Solid Biosciences
SLDB
$900M
$807K ﹤0.01%
+165,700
New +$586K
EQR icon
958
Equity Residential
EQR
$25.1B
$801K ﹤0.01%
11,873
+522
+5% +$35.9K
ENTG icon
959
Entegris
ENTG
$23.2B
$801K ﹤0.01%
9,934
-24
-0.2% -$1.82K
WWD icon
960
Woodward
WWD
$21.4B
$789K ﹤0.01%
3,218
+165
+5% +$33.8K
GWX icon
961
State Street SPDR S&P International Small Cap ETF
GWX
$913M
$785K ﹤0.01%
21,113
-2,857
-12% -$98K
SUI icon
962
Sun Communities
SUI
$14.7B
$781K ﹤0.01%
6,172
-14
-0.2% -$1.74K
XPO icon
963
XPO
XPO
$23.7B
$778K ﹤0.01%
6,161
– –
PAA icon
964
Plains All American Pipeline
PAA
$16.1B
$778K ﹤0.01%
42,440
+17,562
+71% +$306K
CNOB icon
965
Center Bancorp
CNOB
$1.78B
$777K ﹤0.01%
+33,570
New +$766K
ATMP icon
966
iPath Select MLP ETN
ATMP
$621M
$777K ﹤0.01%
26,487
-4,456
-14% -$128K
BAX icon
967
Baxter International
BAX
$14.2B
$775K ﹤0.01%
25,603
-22,694
-47% -$688K
CPB icon
968
Campbell Soup
CPB
$6.87B
$770K ﹤0.01%
25,129
-18,131
-42% -$638K
IEUR icon
969
iShares Core MSCI Europe ETF
IEUR
$9.16B
$767K ﹤0.01%
11,584
+693
+6% +$43.8K
RIG icon
970
Transocean
RIG
$5.82B
$766K ﹤0.01%
295,838
+13,199
+5% +$34K
SOLV icon
971
Solventum
SOLV
$14.1B
$762K ﹤0.01%
10,053
-957
-9% -$67.8K
NJAN icon
972
Innovator Growth-100 Power Buffer ETF January
NJAN
$357M
$762K ﹤0.01%
15,017
– –
VCR icon
973
Vanguard Consumer Discretionary ETF
VCR
$6.33B
$760K ﹤0.01%
2,097
-1,234
-37% -$419K
PSCE icon
974
Invesco S&P SmallCap Energy ETF
PSCE
$97.7M
$757K ﹤0.01%
19,491
-498
-2% -$18.6K
COLD icon
975
Americold
COLD
$4.27B
$747K ﹤0.01%
44,936
+2,651
+6% +$48.1K
37 38
39
40 41

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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.