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
RPG icon
1026
Invesco S&P 500 Pure Growth ETF
RPG
$2.03B
$712K ﹤0.01%
15,264
+4,331
+40% +$203K
HDB icon
1027
HDFC Bank
HDB
$120B
$712K ﹤0.01%
19,497
-726
-4% -$26.1K
IDA icon
1028
Idacorp
IDA
$8.08B
$708K ﹤0.01%
5,591
+3,263
+140% +$424K
CGNX icon
1029
Cognex
CGNX
$10.8B
$707K ﹤0.01%
19,643
-2,048
-9% -$82.9K
SH icon
1030
ProShares Short S&P500
SH
$843M
$707K ﹤0.01%
19,611
+18,557
+1,761% +$680K
GOVT icon
1031
iShares US Treasury Bond ETF
GOVT
$43.6B
$706K ﹤0.01%
30,644
+10,623
+53% +$246K
SOLV icon
1032
Solventum
SOLV
$14.5B
$705K ﹤0.01%
8,902
-10
-0.1% -$766
RL icon
1033
Ralph Lauren
RL
$24.2B
$705K ﹤0.01%
1,994
+87
+5% +$29.7K
HIMS icon
1034
Hims & Hers Health
HIMS
$7.35B
$698K ﹤0.01%
21,507
-11
-0.1% -$471
SEE
1035
DELISTED
Sealed Air
SEE
$697K ﹤0.01%
16,818
-1,792
-10% -$69.3K
REGL icon
1036
ProShares S&P MidCap 400 Dividend Aristocrats ETF
REGL
$1.8B
$697K ﹤0.01%
8,271
+5,554
+204% +$466K
ZROZ icon
1037
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.3B
$696K ﹤0.01%
10,836
+2,333
+27% +$158K
NJAN icon
1038
Innovator Growth-100 Power Buffer ETF January
NJAN
$354M
$696K ﹤0.01%
12,667
– –
EWU icon
1039
iShares MSCI United Kingdom ETF
EWU
$4.15B
$694K ﹤0.01%
15,788
+2,901
+23% +$124K
MGC icon
1040
Vanguard Morningstar Mega Cap ETF
MGC
$10.4B
$694K ﹤0.01%
2,763
+283
+11% +$70.4K
RRX icon
1041
Regal Rexnord
RRX
$11.5B
$685K ﹤0.01%
4,885
+550
+13% +$78.3K
ITGR icon
1042
Integer Holdings
ITGR
$4.25B
$685K ﹤0.01%
8,730
-496
-5% -$39.5K
MFC icon
1043
Manulife Financial
MFC
$73.3B
$679K ﹤0.01%
18,726
-1,156
-6% -$39.2K
PKG icon
1044
Packaging Corp of America
PKG
$22.7B
$679K ﹤0.01%
3,292
+992
+43% +$202K
PSCE icon
1045
Invesco S&P SmallCap Energy ETF
PSCE
$103M
$675K ﹤0.01%
15,696
-2,154
-12% -$92.9K
KEY icon
1046
KeyCorp
KEY
$24.3B
$673K ﹤0.01%
32,601
-250
-0.8% -$4.65K
NDEC
1047
Innovator Growth-100 Power Buffer ETF - December
NDEC
$62.1M
$672K ﹤0.01%
24,216
+5,805
+32% +$159K
HPQ icon
1048
HP
HPQ
$27.3B
$671K ﹤0.01%
30,116
-882
-3% -$22.5K
XPO icon
1049
XPO
XPO
$23.5B
$670K ﹤0.01%
4,927
+70
+1% +$9.54K
APA icon
1050
APA Corp
APA
$14.4B
$664K ﹤0.01%
+27,157
New +$657K
40 41
42
43 44

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.