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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
UBS icon
1251
UBS Group
UBS
$176B
$306K ﹤0.01%
9,047
-394
-4% -$12.2K
ACGL icon
1252
Arch Capital
ACGL
$33.6B
$306K ﹤0.01%
3,357
-1,306
-28% -$121K
PRIM icon
1253
Primoris Services
PRIM
$4.45B
$305K ﹤0.01%
+3,919
New +$266K
UI icon
1254
Ubiquiti
UI
$34.3B
$305K ﹤0.01%
742
– –
TKR icon
1255
Timken Company
TKR
$9.03B
$304K ﹤0.01%
+4,191
New +$285K
NSIT icon
1256
Insight Enterprises
NSIT
$4.38B
$304K ﹤0.01%
2,200
– –
FDL icon
1257
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.82B
$304K ﹤0.01%
7,254
+1,617
+29% +$66.8K
ATO icon
1258
Atmos Energy
ATO
$28.8B
$304K ﹤0.01%
1,970
+152
+8% +$23.6K
MDGL icon
1259
Madrigal Pharmaceuticals
MDGL
$11.8B
$303K ﹤0.01%
1,000
-3
-0.3% -$894
MLPX icon
1260
Global X MLP & Energy Infrastructure ETF
MLPX
$3.53B
$301K ﹤0.01%
4,805
-660
-12% -$40.1K
NIC icon
1261
Nicolet Bankshares
NIC
$3.62B
$301K ﹤0.01%
2,437
– –
FCBC icon
1262
First Community Bankshares
FCBC
$911M
$300K ﹤0.01%
7,654
-2,703
-26% -$103K
IFRA icon
1263
iShares US Infrastructure ETF
IFRA
$4.57B
$299K ﹤0.01%
6,085
-45
-0.7% -$2.09K
DON icon
1264
WisdomTree US MidCap Dividend Fund
DON
$4.09B
$299K ﹤0.01%
5,958
+206
+4% +$9.95K
BMAY icon
1265
Innovator US Equity Buffer ETF May
BMAY
$237M
$298K ﹤0.01%
7,070
-3,207
-31% -$128K
IWX icon
1266
iShares Russell Top 200 Value ETF
IWX
$4.07B
$298K ﹤0.01%
3,543
-18
-0.5% -$1.45K
LITE icon
1267
Lumentum
LITE
$69.3B
$297K ﹤0.01%
+3,120
New +$221K
MRTN icon
1268
Marten Transport
MRTN
$1.22B
$296K ﹤0.01%
22,800
– –
WBS icon
1269
Webster Financial
WBS
$12.8B
$295K ﹤0.01%
5,398
– –
DOX icon
1270
Amdocs
DOX
$6.22B
$293K ﹤0.01%
3,216
+5
+0.2% +$447
ITIC
1271
Investors Title Co
ITIC
$547M
$292K ﹤0.01%
1,384
– –
ARW icon
1272
Arrow Electronics
ARW
$10.4B
$292K ﹤0.01%
2,290
– –
STAG icon
1273
STAG Industrial
STAG
$7.19B
$292K ﹤0.01%
8,037
-39,473
-83% -$1.36M
EXE
1274
Expand Energy Corp
EXE
$21.5B
$291K ﹤0.01%
2,491
-965
-28% -$108K
EQH icon
1275
Equitable Holdings
EQH
$14.1B
$291K ﹤0.01%
5,192
– –
49 50
51
52 53

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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.