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
FUSB icon
1351
First US Bancshares
FUSB
$91.4M
$265K ﹤0.01%
19,000
– –
ANF icon
1352
Abercrombie & Fitch
ANF
$5.27B
$264K ﹤0.01%
2,101
-407
-16% -$35.6K
DLS icon
1353
WisdomTree International SmallCap Dividend Fund
DLS
$1.07B
$263K ﹤0.01%
3,248
+2
+0.1% +$158
EG icon
1354
Everest Group
EG
$14.2B
$262K ﹤0.01%
773
-221
-22% -$73K
BTSG icon
1355
BrightSpring Health Services
BTSG
$12.2B
$262K ﹤0.01%
+7,000
New +$235K
SPAB icon
1356
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$9.91B
$262K ﹤0.01%
10,159
+99
+1% +$2.56K
FOXA icon
1357
Fox Class A
FOXA
$26.6B
$262K ﹤0.01%
+3,580
New +$234K
DBA icon
1358
Invesco DB Agriculture Fund
DBA
$1.24B
$261K ﹤0.01%
10,241
+2,573
+34% +$67.7K
XBAP icon
1359
Innovator US Equity Accelerated 9 Buffer ETF April
XBAP
$133M
$261K ﹤0.01%
6,757
– –
SLYV icon
1360
State Street SPDR S&P 600 Small Cap Value ETF
SLYV
$5.04B
$261K ﹤0.01%
2,869
-1,100
-28% -$98.8K
KIE icon
1361
State Street SPDR S&P Insurance ETF
KIE
$680M
$260K ﹤0.01%
4,329
-1,000
-19% -$58.9K
MRTN icon
1362
Marten Transport
MRTN
$1.2B
$259K ﹤0.01%
22,800
– –
IXJ icon
1363
iShares Global Healthcare ETF
IXJ
$4.24B
$258K ﹤0.01%
2,653
+1,095
+70% +$104K
FCBC icon
1364
First Community Bankshares
FCBC
$902M
$258K ﹤0.01%
7,655
+1
+0% +$33
BIPC icon
1365
Brookfield Infrastructure
BIPC
$4.71B
$257K ﹤0.01%
5,657
+1
+0% +$45
XSD icon
1366
State Street SPDR S&P Semiconductor ETF
XSD
$2.82B
$255K ﹤0.01%
793
-2,000
-72% -$660K
VRSN icon
1367
VeriSign
VRSN
$26.5B
$255K ﹤0.01%
1,048
+136
+15% +$34.2K
PLXS icon
1368
Plexus
PLXS
$7.16B
$254K ﹤0.01%
1,730
-62
-3% -$9.09K
IVOV icon
1369
Vanguard S&P Mid-Cap 400 Value ETF
IVOV
$1.36B
$254K ﹤0.01%
2,515
+242
+11% +$24.4K
TSN icon
1370
Tyson Foods
TSN
$20.1B
$254K ﹤0.01%
4,331
-6,115
-59% -$336K
DON icon
1371
WisdomTree US MidCap Dividend Fund
DON
$4.08B
$253K ﹤0.01%
4,908
+525
+12% +$27.1K
WCLD
1372
WisdomTree Cloud Computing Fund
WCLD
$305M
$252K ﹤0.01%
7,195
– –
SHE icon
1373
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$336M
$250K ﹤0.01%
1,896
+1
+0.1% +$130
XME icon
1374
State Street SPDR S&P Metals & Mining ETF
XME
$4.55B
$250K ﹤0.01%
2,412
-60
-2% -$5.93K
ROBO icon
1375
ROBO Global Robotics & Automation Index ETF
ROBO
$2.09B
$250K ﹤0.01%
3,602
+280
+8% +$19.1K
53 54
55
56 57

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.