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
SPYX icon
1626
State Street SPDR S&P 500 Fossil Fuel Reserves Free ETF
SPYX
$2.87B
$63.4K ﹤0.01%
1,128
– –
AIVI icon
1627
WisdomTree International AI Enhanced Value Fund
AIVI
$63.4M
$62.9K ﹤0.01%
1,210
– –
NFRA icon
1628
FlexShares STOXX Global Broad Infrastructure Index Fund
NFRA
$3B
$61.1K ﹤0.01%
1,010
+569
+129% +$35.6K
WIT icon
1629
Wipro
WIT
$19.8B
$60.8K ﹤0.01%
21,419
+6,495
+44% +$17.7K
IXG icon
1630
iShares Global Financials ETF
IXG
$697M
$58.9K ﹤0.01%
488
– –
ISCG icon
1631
iShares Morningstar Small-Cap Growth ETF
ISCG
$1.01B
$58.9K ﹤0.01%
1,062
– –
IDU icon
1632
iShares US Utilities ETF
IDU
$1.35B
$58.8K ﹤0.01%
543
– –
FNCL icon
1633
Fidelity MSCI Financials Index ETF
FNCL
$2.41B
$58.5K ﹤0.01%
752
– –
EWH icon
1634
iShares MSCI Hong Kong ETF
EWH
$1.23B
$58.2K ﹤0.01%
2,741
-85
-3% -$1.85K
DGRS icon
1635
WisdomTree Trust WisdomTree US SmallCap Quality Dividend Growth Fund
DGRS
$411M
$58.1K ﹤0.01%
1,170
-100
-8% -$4.95K
ITEQ icon
1636
Amplify BlueStar Israel Technology ETF
ITEQ
$119M
$58K ﹤0.01%
1,000
– –
LRGF icon
1637
iShares US Equity Factor ETF
LRGF
$3.71B
$57.7K ﹤0.01%
831
– –
UA icon
1638
Under Armour Class C
UA
$2.36B
$57K ﹤0.01%
11,885
+1,254
+12% +$5.58K
TBF icon
1639
ProShares Short 20+ Year Treasury ETF
TBF
$106M
$56.7K ﹤0.01%
2,350
– –
GSUS icon
1640
Goldman Sachs MarketBeta US Equity ETF
GSUS
$3.3B
$56.6K ﹤0.01%
600
– –
PWV icon
1641
Invesco Large Cap Value ETF
PWV
$1.77B
$56.5K ﹤0.01%
850
– –
NURE icon
1642
Nuveen Short-Term REIT ETF
NURE
$34.7M
$56.3K ﹤0.01%
2,000
– –
IWC icon
1643
iShares Micro-Cap ETF
IWC
$1.49B
$56K ﹤0.01%
+355
New +$55.2K
IRD
1644
Opus Genetics
IRD
$308M
$55.2K ﹤0.01%
27,466
+3,000
+12% +$6.09K
SPTS icon
1645
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.11B
$55.2K ﹤0.01%
1,885
+2
+0.1% +$59
WOMN icon
1646
Impact Shares Womens Empowerment ETF Trading
WOMN
$59.1M
$54.9K ﹤0.01%
1,321
-30
-2% -$1.23K
ITB icon
1647
iShares US Home Construction ETF
ITB
$2.34B
$54.4K ﹤0.01%
565
-551
-49% -$55.6K
FV icon
1648
First Trust Dorsey Wright Focus 5 ETF
FV
$3.78B
$54K ﹤0.01%
858
+2
+0.2% +$124
IMMP
1649
Immutep
IMMP
$57.5M
$53.1K ﹤0.01%
18,569
– –
FDD icon
1650
First Trust STOXX European Select Dividend Income Fund
FDD
$906M
$52.5K ﹤0.01%
3,000
– –
64 65
66
67 68

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.