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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+1.73%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
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
BIIB icon
826
Biogen
BIIB
$30.4B
$1.49M ﹤0.01%
8,443
-5,577
-40% -$911K
BBCA icon
827
JPMorgan BetaBuilders Canada ETF
BBCA
$11.3B
$1.48M ﹤0.01%
15,930
+616
+4% +$54.8K
SONY icon
828
Sony
SONY
$139B
$1.47M ﹤0.01%
57,250
+327
+0.6% +$9.18K
AIG icon
829
American International
AIG
$40.6B
$1.46M ﹤0.01%
17,115
-158
-0.9% -$12.6K
RWO icon
830
State Street SPDR Dow Jones Global Real Estate ETF
RWO
$1.28B
$1.46M ﹤0.01%
32,474
+981
+3% +$44.6K
PSLV icon
831
Sprott Physical Silver Trust
PSLV
$13.5B
$1.45M ﹤0.01%
61,391
-1,211
-2% -$22.2K
BJUL icon
832
Innovator US Equity Buffer ETF July
BJUL
$353M
$1.45M ﹤0.01%
28,530
– –
VONE icon
833
Vanguard Russell 1000 ETF
VONE
$8.65B
$1.44M ﹤0.01%
4,652
+3,900
+519% +$1.2M
MLPA icon
834
Global X MLP ETF
MLPA
$2.28B
$1.44M ﹤0.01%
29,687
+1,564
+6% +$75.4K
TFC icon
835
Truist Financial
TFC
$64B
$1.44M ﹤0.01%
29,175
-8,855
-23% -$408K
EXP icon
836
Eagle Materials
EXP
$6.47B
$1.43M ﹤0.01%
6,937
+561
+9% +$124K
ARKK icon
837
ARK Innovation ETF
ARKK
$6.35B
$1.43M ﹤0.01%
18,614
+1,897
+11% +$157K
FLOT icon
838
iShares Floating Rate Bond ETF
FLOT
$10.5B
$1.43M ﹤0.01%
28,044
-696
-2% -$35.5K
ARM icon
839
Arm
ARM
$284B
$1.42M ﹤0.01%
12,996
-875
-6% -$127K
MNST icon
840
Monster Beverage
MNST
$89.6B
$1.42M ﹤0.01%
36,934
+3,446
+10% +$123K
QXO
841
QXO Inc
QXO
$16.8B
$1.41M ﹤0.01%
72,923
-9,092
-11% -$174K
DRI icon
842
Darden Restaurants
DRI
$24.9B
$1.41M ﹤0.01%
7,640
+425
+6% +$77.5K
ADPT icon
843
Adaptive Biotechnologies
ADPT
$4.06B
$1.4M ﹤0.01%
86,466
-11,071
-11% -$181K
ZETA icon
844
Zeta Global
ZETA
$7.16B
$1.4M ﹤0.01%
68,891
+27,556
+67% +$515K
DEO icon
845
Diageo
DEO
$52.8B
$1.4M ﹤0.01%
16,231
-5,934
-27% -$547K
THRY icon
846
Thryv Holdings
THRY
$95.1M
$1.4M ﹤0.01%
231,301
-316,117
-58% -$2.5M
QTEC icon
847
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.73B
$1.4M ﹤0.01%
6,066
-58
-0.9% -$13.5K
OSIS icon
848
OSI Systems
OSIS
$3.83B
$1.39M ﹤0.01%
5,461
+606
+12% +$158K
EEMA icon
849
iShares MSCI Emerging Markets Asia ETF
EEMA
$858M
$1.39M ﹤0.01%
14,768
+197
+1% +$18.4K
FLEX icon
850
Flex
FLEX
$45B
$1.39M ﹤0.01%
22,965
-2,291
-9% -$142K
32 33
34
35 36

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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.