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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
+1.73%
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
$37.3B
AUM Growth
-$310M
Cap. Flow
-$212M
Cap. Flow %
-0.57%
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96

Top Buys

Rank Stock Value
1
BWXT icon
BWX Technologies
BWXT
+$46.6M
2
META icon
Meta Platforms (Facebook)
META
+$38.3M
3
NOW icon
ServiceNow
NOW
+$37.6M
4
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$32.4M
5
GLD icon
SPDR Gold Trust
GLD
+$29.4M

Top Sells

Rank Stock Value
1
FISV
Fiserv Inc
FISV
+$114M
2
CSGP icon
CoStar Group
CSGP
+$78.3M
3
CWAN
Clearwater Analytics
CWAN
+$75.3M
4
POOL icon
Pool Corp
POOL
+$54M
5
ZTS icon
Zoetis
ZTS
+$51.3M

Sector Composition

Rank Sector Weight
1 Technology 25.8%
2 Financials 13.4%
3 Industrials 12.04%
4 Healthcare 11.22%
5 Communication Services 7.63%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PDEC icon
176
Innovator US Equity Power Buffer ETF December
PDEC
$997M
$32.8M 0.09%
755,492
+10,935
+1% +$467K
NEE icon
177
NextEra Energy
NEE
$177B
$32.7M 0.09%
407,801
-829
-0.2% -$68.7K
COF icon
178
Capital One
COF
$134B
$31.5M 0.08%
129,842
-2,954
-2% -$658K
SPXC icon
179
SPX Corp
SPXC
$10.8B
$31.4M 0.08%
156,826
+4,566
+3% +$932K
IT icon
180
Gartner
IT
$11.7B
$30.9M 0.08%
122,552
+4,358
+4% +$1.05M
XLK icon
181
State Street Technology Select Sector SPDR ETF
XLK
$123B
$30.8M 0.08%
213,897
+4,647
+2% +$671K
TXN icon
182
Texas Instruments
TXN
$261B
$30.4M 0.08%
175,045
-29,619
-14% -$5.07M
SCHD icon
183
Schwab US Dividend Equity ETF
SCHD
$106B
$30M 0.08%
1,093,230
-115,631
-10% -$3.14M
PJUL icon
184
Innovator US Equity Power Buffer ETF July
PJUL
$1.29B
$29.4M 0.08%
634,206
-4,267
-0.7% -$196K
PH icon
185
Parker-Hannifin
PH
$135B
$29.4M 0.08%
33,468
+885
+3% +$724K
EW icon
186
Edwards Lifesciences
EW
$51.7B
$29.4M 0.08%
344,800
-27,553
-7% -$2.26M
MIAX
187
Miami International Holdings
MIAX
$4.28B
$29.1M 0.08%
654,845
+291,080
+80% +$13M
ACWX icon
188
iShares MSCI ACWI ex US ETF
ACWX
$11.9B
$28.9M 0.08%
430,861
+57,329
+15% +$3.8M
IWB icon
189
iShares Russell 1000 ETF
IWB
$50.2B
$28.4M 0.08%
76,144
-469
-0.6% -$174K
GDX icon
190
VanEck Gold Miners ETF
GDX
$27.4B
$28M 0.08%
326,631
+1,666
+0.5% +$132K
MS icon
191
Morgan Stanley
MS
$340B
$27.8M 0.07%
156,713
+4,095
+3% +$683K
CHWY icon
192
Chewy
CHWY
$9.63B
$27.7M 0.07%
838,128
-306,683
-27% -$10.6M
WFC icon
193
Wells Fargo
WFC
$264B
$27.5M 0.07%
295,538
+23,743
+9% +$2.06M
DVAX
194
DELISTED
Dynavax Technologies
DVAX
$27.4M 0.07%
1,781,442
-447,167
-20% -$4.93M
CWST icon
195
Casella Waste Systems
CWST
$5.69B
$27.3M 0.07%
279,121
+11,143
+4% +$1.03M
GLW icon
196
Corning
GLW
$143B
$27.1M 0.07%
309,855
+34,713
+13% +$2.99M
CGDV icon
197
Capital Group Dividend Value ETF
CGDV
$38.9B
$27.1M 0.07%
620,736
+99,721
+19% +$4.28M
BJ icon
198
BJs Wholesale Club
BJ
$12.3B
$26.7M 0.07%
296,506
-73,542
-20% -$6.75M
ETN icon
199
Eaton
ETN
$174B
$26.6M 0.07%
83,608
-499
-0.6% -$177K
APD icon
200
Air Products & Chemicals
APD
$67.6B
$26.6M 0.07%
107,700
-5,481
-5% -$1.39M
6 7
8
9 10

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William Blair & Company's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair & Company held 1,963 positions worth $37.3B, down 0.82% from $37.6B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair & Company's Q4 2025 filing shows 120 new, 759 increased, 753 reduced and 96 closed positions. Its largest new stake was Wingstop: 90,773 shares worth $21.6M. The largest sale was Fiserv Inc, an estimated $114M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 27% a quarter earlier, followed by Financials and Industrials.

  • William Blair & Company's largest Q4 2025 buy was Wingstop: 90,773 shares worth $21.6M.
  • William Blair & Company added most to BWX Technologies in Q4 2025, an estimated $46.6M increase.
  • William Blair & Company's biggest Q4 2025 reduction was Fiserv Inc, cutting an estimated $114M.
  • William Blair & Company fully exited SAP in Q4 2025, selling an estimated $9.19M.
  • William Blair & Company's ten largest holdings make up 27% of its $37.3B portfolio in Q4 2025.
  • William Blair & Company opened 120 new positions and closed 96 in Q4 2025.
  • William Blair & Company's portfolio value fell 0.82% quarter-over-quarter to $37.3B.

Based on William Blair & Company's 13F filing for Q4 2025, filed 17 Feb 2026.