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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
PAYC icon
1326
Paycom
PAYC
$9.62B
$287K ﹤0.01%
1,802
-155
-8% -$27.5K
CNO icon
1327
CNO Financial Group
CNO
$5.12B
$287K ﹤0.01%
6,761
+124
+2% +$5.05K
SCHC icon
1328
Schwab International Small-Cap Equity ETF
SCHC
$5.63B
$284K ﹤0.01%
6,240
+91
+1% +$4.12K
IVOO icon
1329
Vanguard S&P Mid-Cap 400 ETF
IVOO
$3.91B
$283K ﹤0.01%
2,531
+2,075
+455% +$230K
FTS icon
1330
Fortis
FTS
$28.3B
$283K ﹤0.01%
5,443
– –
ACI icon
1331
Albertsons Companies
ACI
$5.89B
$282K ﹤0.01%
16,447
+460
+3% +$8.2K
HEDJ icon
1332
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.87B
$282K ﹤0.01%
5,320
+2,902
+120% +$150K
LW icon
1333
Lamb Weston
LW
$7.12B
$281K ﹤0.01%
6,706
-98
-1% -$5.77K
AOA icon
1334
iShares Core 80/20 Aggressive Allocation ETF
AOA
$3.27B
$280K ﹤0.01%
3,131
+2,036
+186% +$181K
GNR icon
1335
State Street SPDR S&P Global Natural Resources ETF
GNR
$4.95B
$279K ﹤0.01%
4,497
+847
+23% +$50.9K
ENSG icon
1336
The Ensign Group
ENSG
$10.7B
$279K ﹤0.01%
+1,601
New +$288K
SMCI icon
1337
Super Micro Computer
SMCI
$20.4B
$279K ﹤0.01%
9,523
-2,349
-20% -$96.7K
FRT icon
1338
Federal Realty Investment Trust
FRT
$10.2B
$278K ﹤0.01%
2,760
-937
-25% -$92.3K
FDL icon
1339
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.85B
$278K ﹤0.01%
6,262
-5,660
-47% -$247K
HAIN icon
1340
Hain Celestial
HAIN
$53.4M
$277K ﹤0.01%
258,464
+8,626
+3% +$10.6K
INDA icon
1341
iShares MSCI India ETF
INDA
$6.6B
$276K ﹤0.01%
5,110
-3,386
-40% -$182K
WCC
1342
WESCO International
WCC
$17.9B
$274K ﹤0.01%
1,120
+92
+9% +$22.6K
IBKR icon
1343
Interactive Brokers
IBKR
$41.1B
$274K ﹤0.01%
4,256
-148
-3% -$9.91K
FBIN icon
1344
Fortune Brands Innovations
FBIN
$5.73B
$273K ﹤0.01%
5,465
-1,430
-21% -$71.8K
DOX icon
1345
Amdocs
DOX
$6.22B
$273K ﹤0.01%
3,386
-7
-0.2% -$563
MLPX icon
1346
Global X MLP & Energy Infrastructure ETF
MLPX
$3.53B
$270K ﹤0.01%
4,465
– –
IOO icon
1347
iShares Global 100 ETF
IOO
$9.47B
$269K ﹤0.01%
2,125
-37
-2% -$4.6K
ODC icon
1348
Oil-Dri
ODC
$1.28B
$268K ﹤0.01%
5,480
– –
NAUG
1349
Innovator Growth-100 Power Buffer ETF - August
NAUG
$57.2M
$268K ﹤0.01%
9,054
– –
INVH icon
1350
Invitation Homes
INVH
$17.8B
$266K ﹤0.01%
9,581
+817
+9% +$22.8K
52 53
54
55 56

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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.