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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
IOT icon
176
Samsara
IOT
$22.1B
$31.6M 0.09%
794,108
+1,011
+0.1% +$41.8K
IJR icon
177
iShares Core S&P Small-Cap ETF
IJR
$112B
$31.2M 0.09%
285,111
-36,912
-11% -$3.82M
CBZ icon
178
CBIZ
CBZ
$2.96B
$31.2M 0.09%
434,498
+6,893
+2% +$499K
APD icon
179
Air Products & Chemicals
APD
$66.6B
$31.1M 0.09%
110,304
+6,048
+6% +$1.65M
TREX icon
180
Trex
TREX
$4.9B
$30.8M 0.09%
567,199
-113,517
-17% -$6.43M
PDEC icon
181
Innovator US Equity Power Buffer ETF December
PDEC
$995M
$30.7M 0.09%
766,577
-83,796
-10% -$3.2M
DOCU
182
DocuSign
DOCU
$10.8B
$30.6M 0.09%
393,334
+5,792
+1% +$469K
EW icon
183
Edwards Lifesciences
EW
$51.4B
$30.5M 0.08%
390,133
-30,093
-7% -$2.24M
ETN icon
184
Eaton
ETN
$174B
$29.5M 0.08%
82,592
+285
+0.3% +$87.8K
VWO icon
185
Vanguard FTSE Emerging Markets ETF
VWO
$123B
$29.4M 0.08%
594,805
-22,028
-4% -$1.02M
XLF icon
186
State Street Financial Select Sector SPDR ETF
XLF
$58.3B
$28.8M 0.08%
549,194
-33,713
-6% -$1.67M
PRCT icon
187
Procept Biorobotics
PRCT
$1.11B
$28.6M 0.08%
497,205
+26,919
+6% +$1.52M
NEE icon
188
NextEra Energy
NEE
$176B
$28.6M 0.08%
412,467
+11,754
+3% +$816K
COF icon
189
Capital One
COF
$135B
$28.5M 0.08%
134,114
+53,731
+67% +$10M
KLAC icon
190
KLA
KLAC
$255B
$28.3M 0.08%
315,390
+5,810
+2% +$437K
VZ icon
191
Verizon
VZ
$194B
$27.1M 0.08%
625,288
+4,964
+0.8% +$215K
ZBRA icon
192
Zebra Technologies
ZBRA
$17.4B
$26.9M 0.07%
87,140
+97
+0.1% +$26.3K
EHC icon
193
Encompass Health
EHC
$12.4B
$26.7M 0.07%
217,519
+3,867
+2% +$442K
KMX icon
194
CarMax
KMX
$8.28B
$26.3M 0.07%
391,921
-64,149
-14% -$4.31M
AMLP icon
195
Alerian MLP ETF
AMLP
$12.9B
$26M 0.07%
531,817
+10,001
+2% +$485K
IWB icon
196
iShares Russell 1000 ETF
IWB
$49.7B
$25.9M 0.07%
76,252
-1,050
-1% -$330K
BSV icon
197
Vanguard Short-Term Bond ETF
BSV
$44.6B
$25.5M 0.07%
323,984
-2,215
-0.7% -$173K
FSV icon
198
FirstService
FSV
$6.24B
$25.4M 0.07%
145,399
+52,748
+57% +$9.14M
FIS icon
199
Fidelity National Information Services
FIS
$21.9B
$25.2M 0.07%
309,722
-2,385
-0.8% -$186K
SPXC icon
200
SPX Corp
SPXC
$10.7B
$25M 0.07%
148,858
-4,588
-3% -$672K
6 7
8
9 10

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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.