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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
SSNC icon
351
SS&C Technologies
SSNC
$18.7B
$10.3M 0.03%
118,121
+2,238
+2% +$191K
GCMG icon
352
GCM Grosvenor
GCMG
$824M
$10.3M 0.03%
911,816
-25,253
-3% -$288K
VBK icon
353
Vanguard Morningstar Small-Cap Growth ETF
VBK
$24.6B
$10.3M 0.03%
33,964
+5,575
+20% +$1.68M
MAR icon
354
Marriott International
MAR
$90B
$10.2M 0.03%
32,955
-1,558
-5% -$445K
MKC icon
355
McCormick & Company Non-Voting
MKC
$14.2B
$10.2M 0.03%
149,862
+2,861
+2% +$190K
PAPR icon
356
Innovator US Equity Power Buffer ETF April
PAPR
$960M
$10.1M 0.03%
259,244
-9,267
-3% -$358K
KFY icon
357
Korn Ferry
KFY
$4.25B
$10.1M 0.03%
153,534
-13,264
-8% -$892K
IWN icon
358
iShares Russell 2000 Value ETF
IWN
$14.5B
$9.91M 0.03%
54,700
-391
-0.7% -$70.2K
LNG icon
359
Cheniere Energy
LNG
$54.7B
$9.91M 0.03%
50,989
-5,878
-10% -$1.23M
RSG icon
360
Republic Services
RSG
$65.8B
$9.85M 0.03%
46,471
+15,680
+51% +$3.37M
ZM icon
361
Zoom
ZM
$31.4B
$9.85M 0.03%
114,114
+1,096
+1% +$92.3K
OKE icon
362
Oneok
OKE
$56.3B
$9.8M 0.03%
133,279
-10,147
-7% -$719K
ESGV icon
363
Vanguard ESG US Stock ETF
ESGV
$13.6B
$9.7M 0.03%
80,158
+5,907
+8% +$709K
TDUP icon
364
ThredUp
TDUP
$422M
$9.62M 0.03%
1,506,155
+71,802
+5% +$581K
PHO icon
365
Invesco Water Resources ETF
PHO
$2.09B
$9.61M 0.03%
136,477
+430
+0.3% +$31K
OMC icon
366
Omnicom Group
OMC
$23.2B
$9.59M 0.03%
118,819
+2,477
+2% +$189K
EOG icon
367
EOG Resources
EOG
$74.3B
$9.56M 0.03%
91,025
-17,876
-16% -$1.92M
PYPL icon
368
PayPal
PYPL
$50.1B
$9.52M 0.03%
163,089
-15,617
-9% -$1.01M
HURN icon
369
Huron Consulting
HURN
$2.44B
$9.5M 0.03%
54,950
+553
+1% +$90.5K
HBAN icon
370
Huntington Bancshares
HBAN
$35.3B
$9.4M 0.03%
541,550
-9,875
-2% -$162K
EFG icon
371
iShares MSCI EAFE Growth ETF
EFG
$17.2B
$9.28M 0.02%
81,438
+401
+0.5% +$46K
XLC icon
372
State Street Communication Services Select Sector SPDR ETF
XLC
$22.5B
$9.24M 0.02%
78,502
+4,031
+5% +$464K
TRMB icon
373
Trimble
TRMB
$13.8B
$9.18M 0.02%
117,182
-3,717
-3% -$296K
BINC icon
374
BlackRock Flexible Income ETF
BINC
$16.3B
$9.18M 0.02%
173,983
+32,053
+23% +$1.7M
BN icon
375
Brookfield
BN
$108B
$9.08M 0.02%
197,798
-1,933
-1% -$88.1K
13 14
15
16 17

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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.