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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
SN icon
326
SharkNinja
SN
$26B
$11.9M 0.03%
106,211
+4,980
+5% +$491K
DT icon
327
Dynatrace
DT
$14.7B
$11.8M 0.03%
272,713
-179,555
-40% -$8.37M
ONON icon
328
On Holding
ONON
$12.9B
$11.8M 0.03%
+253,743
New +$10.9M
VLTO icon
329
Veralto
VLTO
$23.8B
$11.5M 0.03%
115,405
-7,872
-6% -$796K
MO icon
330
Altria Group
MO
$111B
$11.5M 0.03%
199,020
+6,205
+3% +$375K
XLE icon
331
State Street Energy Select Sector SPDR ETF
XLE
$39.1B
$11.5M 0.03%
256,580
-13,296
-5% -$592K
IJUL icon
332
Innovator International Developed Power Buffer ETF July
IJUL
$257M
$11.4M 0.03%
341,024
– –
PNC icon
333
PNC Financial Services
PNC
$100B
$11.4M 0.03%
54,731
-1,435
-3% -$277K
SO icon
334
Southern Company
SO
$105B
$11.2M 0.03%
128,905
+4,452
+4% +$406K
NVS icon
335
Novartis
NVS
$297B
$11.2M 0.03%
81,278
+15,552
+24% +$2.04M
IRT icon
336
Independence Realty Trust
IRT
$3.95B
$11.2M 0.03%
639,008
-36,237
-5% -$601K
BSX icon
337
Boston Scientific
BSX
$73.5B
$11.1M 0.03%
116,698
+1,520
+1% +$149K
T icon
338
AT&T
T
$164B
$11.1M 0.03%
446,021
-11,447
-3% -$290K
TEL icon
339
TE Connectivity
TEL
$62.7B
$11M 0.03%
48,394
-3,685
-7% -$852K
CI icon
340
Cigna
CI
$73.6B
$11M 0.03%
39,997
-888
-2% -$249K
MEC icon
341
Mayville Engineering Co
MEC
$592M
$10.9M 0.03%
583,759
+206,549
+55% +$3.37M
PLNT icon
342
Planet Fitness
PLNT
$3.66B
$10.9M 0.03%
100,736
-1,020
-1% -$105K
PAVE icon
343
Global X US Infrastructure Development ETF
PAVE
$14.3B
$10.9M 0.03%
228,197
+2,932
+1% +$141K
DUK icon
344
Duke Energy
DUK
$95.2B
$10.8M 0.03%
92,179
-4,120
-4% -$503K
SDY icon
345
State Street SPDR S&P Dividend ETF
SDY
$22.1B
$10.7M 0.03%
77,205
+3,125
+4% +$435K
TTWO icon
346
Take-Two Interactive
TTWO
$47.3B
$10.7M 0.03%
41,827
+6,405
+18% +$1.6M
VPU
347
Vanguard Utilities ETF
VPU
$8.37B
$10.6M 0.03%
57,412
+438
+0.8% +$84.1K
EXEL icon
348
Exelixis
EXEL
$13.1B
$10.5M 0.03%
238,785
-37,341
-14% -$1.54M
DLN icon
349
WisdomTree US LargeCap Dividend Fund
DLN
$6.4B
$10.4M 0.03%
118,203
+11,488
+11% +$1M
BROS icon
350
Dutch Bros
BROS
$8.96B
$10.4M 0.03%
169,772
-24,988
-13% -$1.42M
12 13
14
15 16

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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.