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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
VONV icon
551
Vanguard Russell 1000 Value ETF
VONV
$22B
$4.46M 0.01%
48,298
+5,083
+12% +$461K
OKLO
552
Oklo
OKLO
$7.74B
$4.44M 0.01%
61,896
-333
-0.5% -$37.1K
PHM icon
553
Pultegroup
PHM
$24.8B
$4.43M 0.01%
37,801
+4,808
+15% +$590K
CWB icon
554
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.59B
$4.42M 0.01%
49,552
+5,575
+13% +$507K
SITE icon
555
SiteOne Landscape Supply
SITE
$4.34B
$4.41M 0.01%
35,386
-17,166
-33% -$2.17M
WEC icon
556
WEC Energy
WEC
$34.6B
$4.37M 0.01%
41,462
+157
+0.4% +$17.4K
HYG icon
557
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$17.9B
$4.37M 0.01%
54,137
-1,521
-3% -$123K
CIEN icon
558
Ciena
CIEN
$54.9B
$4.34M 0.01%
18,573
+63
+0.3% +$12.2K
DDOG icon
559
Datadog
DDOG
$93.6B
$4.34M 0.01%
31,887
+4,580
+17% +$724K
JEPQ icon
560
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$41.4B
$4.3M 0.01%
73,982
-10,041
-12% -$583K
CACC icon
561
Credit Acceptance
CACC
$6.03B
$4.29M 0.01%
9,666
+3
+0% +$1.39K
AVY icon
562
Avery Dennison
AVY
$13.5B
$4.26M 0.01%
23,440
+17,176
+274% +$2.97M
CORZ icon
563
Core Scientific
CORZ
$6.25B
$4.25M 0.01%
292,069
+336
+0.1% +$5.86K
OKTA icon
564
Okta
OKTA
$26.2B
$4.25M 0.01%
49,152
-5,069
-9% -$442K
DIVO icon
565
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.8B
$4.25M 0.01%
95,421
+11,126
+13% +$501K
SCHF icon
566
Schwab International Equity ETF
SCHF
$68.3B
$4.21M 0.01%
175,147
-4,421
-2% -$105K
ITT icon
567
ITT
ITT
$18.9B
$4.2M 0.01%
24,194
-76
-0.3% -$13.6K
TTEK icon
568
Tetra Tech
TTEK
$8.97B
$4.14M 0.01%
123,517
-112,432
-48% -$3.8M
VTEB icon
569
Vanguard Tax-Exempt Bond Index Fund
VTEB
$46B
$4.11M 0.01%
81,656
+4,526
+6% +$228K
WSM icon
570
Williams-Sonoma
WSM
$29.5B
$4.1M 0.01%
22,936
-533
-2% -$99.9K
SPIB icon
571
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.5B
$4.09M 0.01%
121,099
+2,833
+2% +$95.9K
IRDM icon
572
Iridium Communications
IRDM
$5.23B
$4.08M 0.01%
234,958
+7,227
+3% +$128K
VST icon
573
Vistra
VST
$48.2B
$4.08M 0.01%
25,297
+3,264
+15% +$595K
PJUN icon
574
Innovator US Equity Power Buffer ETF June
PJUN
$975M
$4.06M 0.01%
96,907
-190
-0.2% -$7.87K
MUB icon
575
iShares National Muni Bond ETF
MUB
$45.8B
$4.04M 0.01%
37,673
-943
-2% -$101K
21 22
23
24 25

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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.