We are live on ! Find out more
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
PSX icon
201
Phillips 66
PSX
$81.4B
$26.2M 0.07%
203,074
-14,298
-7% -$1.92M
BSV icon
202
Vanguard Short-Term Bond ETF
BSV
$45.6B
$26.2M 0.07%
332,153
+5,779
+2% +$456K
SPOT icon
203
Spotify
SPOT
$100B
$26.1M 0.07%
44,945
+5,492
+14% +$3.43M
SLV icon
204
iShares Silver Trust
SLV
$30.9B
$25.9M 0.07%
401,524
+216,153
+117% +$10.8M
CMI icon
205
Cummins
CMI
$88.7B
$25.6M 0.07%
50,080
+1,990
+4% +$930K
VZ icon
206
Verizon
VZ
$196B
$25.2M 0.07%
619,857
-36,868
-6% -$1.5M
VGT icon
207
Vanguard Information Technology ETF
VGT
$149B
$25.1M 0.07%
266,680
+1,264
+0.5% +$120K
AMLP icon
208
Alerian MLP ETF
AMLP
$13.1B
$24.9M 0.07%
530,590
+3,489
+0.7% +$163K
VRT icon
209
Vertiv
VRT
$105B
$24.9M 0.07%
153,665
+75,878
+98% +$13.2M
VOE icon
210
Vanguard Morningstar Mid-Cap Value ETF
VOE
$24.2B
$24.9M 0.07%
140,164
+2,213
+2% +$387K
VXF icon
211
Vanguard Extended Market ETF
VXF
$31.9B
$24.6M 0.07%
117,770
+40,389
+52% +$8.48M
IEMG icon
212
iShares Core MSCI Emerging Markets ETF
IEMG
$156B
$24.6M 0.07%
365,789
+24,047
+7% +$1.61M
AFRM icon
213
Affirm
AFRM
$25.2B
$23.9M 0.06%
320,683
-306
-0.1% -$22K
MCK icon
214
McKesson
MCK
$101B
$23.7M 0.06%
28,872
+14,815
+105% +$12.1M
DVY icon
215
iShares Select Dividend ETF
DVY
$23.6B
$23.3M 0.06%
165,015
+17,845
+12% +$2.52M
CMG icon
216
Chipotle Mexican Grill
CMG
$41.5B
$23.2M 0.06%
628,330
-867,914
-58% -$31.4M
SHW icon
217
Sherwin-Williams
SHW
$89.8B
$23.2M 0.06%
71,592
-3,965
-5% -$1.33M
VYM icon
218
Vanguard High Dividend Yield ETF
VYM
$83.5B
$23.1M 0.06%
161,299
+7,687
+5% +$1.09M
BOKF icon
219
BOK Financial
BOKF
$8.74B
$23.1M 0.06%
195,182
+12
+0% +$1.34K
AJG icon
220
Arthur J. Gallagher & Co
AJG
$63.6B
$23M 0.06%
88,738
-25,015
-22% -$6.62M
CEG icon
221
Constellation Energy
CEG
$95.6B
$22.9M 0.06%
64,703
+3,103
+5% +$1.13M
EHC icon
222
Encompass Health
EHC
$12.4B
$22.7M 0.06%
213,539
-2,567
-1% -$298K
FSV icon
223
FirstService
FSV
$6.32B
$22.3M 0.06%
143,062
-4,009
-3% -$652K
TRU icon
224
TransUnion
TRU
$15.3B
$22.2M 0.06%
258,976
-95,547
-27% -$7.85M
TROW icon
225
T. Rowe Price
TROW
$24.3B
$22.2M 0.06%
216,715
-2,774
-1% -$286K
7 8
9
10 11

Similar funds

SAM
Storebrand Asset Management Lysaker, Norway $34.8B AUM 25.49% 1-Year Est. Return
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
Pacer Advisors
Pacer Advisors Malvern, Pennsylvania $35.6B AUM 18.19% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
First Manhattan
First Manhattan New York $36.1B AUM 11.5% 1-Year Est. Return

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.