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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
BBY icon
626
Best Buy
BBY
$17.4B
$3.14M 0.01%
46,888
-1,824
-4% -$139K
OSW icon
627
OneSpaWorld
OSW
$2.62B
$3.14M 0.01%
151,252
-1,025
-0.7% -$21.5K
BCO icon
628
Brink's
BCO
$4.55B
$3.13M 0.01%
26,778
-63
-0.2% -$7.21K
AMG icon
629
Affiliated Managers Group
AMG
$9.6B
$3.09M 0.01%
10,724
-12
-0.1% -$3.1K
DSGR icon
630
Distribution Solutions Group
DSGR
$1.61B
$3.09M 0.01%
+112,870
New +$3.17M
CCC
631
CCC Intelligent Solutions
CCC
$4.11B
$3.08M 0.01%
387,864
+83,404
+27% +$678K
TGT icon
632
Target
TGT
$69B
$3.08M 0.01%
31,531
-4,389
-12% -$404K
SCHR
633
Schwab Intermediately-Term US Treasury ETF
SCHR
$13.3B
$3.08M 0.01%
122,783
+12,141
+11% +$306K
PAR icon
634
PAR Technology
PAR
$753M
$3.06M 0.01%
84,423
-23,889
-22% -$862K
PRI icon
635
Primerica
PRI
$9.65B
$3.05M 0.01%
11,822
-474
-4% -$124K
SRE icon
636
Sempra
SRE
$55.1B
$3.04M 0.01%
34,465
-2,028
-6% -$185K
SPG icon
637
Simon Property Group
SPG
$71.5B
$3.04M 0.01%
16,397
-307
-2% -$55.8K
BDEC icon
638
Innovator US Equity Buffer ETF December
BDEC
$222M
$3.01M 0.01%
60,791
-5,409
-8% -$264K
RH icon
639
RH
RH
$3.47B
$3.01M 0.01%
16,802
-1,530
-8% -$262K
OSBC icon
640
Old Second Bancorp
OSBC
$1.29B
$3.01M 0.01%
154,219
-217
-0.1% -$4.05K
Q
641
Qnity Electronics Inc
Q
$28.1B
$3M 0.01%
+36,785
New +$3.12M
ALGN icon
642
Align Technology
ALGN
$12.5B
$3M 0.01%
19,232
-15,363
-44% -$2.2M
DD icon
643
DuPont de Nemours
DD
$19.1B
$2.99M 0.01%
24,825
-36,187
-59% -$4.07M
MSTR icon
644
Strategy Inc
MSTR
$38.3B
$2.99M 0.01%
19,662
-313
-2% -$72.1K
WAL icon
645
Western Alliance Bancorporation
WAL
$8.78B
$2.98M 0.01%
35,505
-6,921
-16% -$562K
LH icon
646
Labcorp
LH
$26.1B
$2.95M 0.01%
11,751
+54
+0.5% +$14.3K
STVN icon
647
Stevanato
STVN
$5.62B
$2.92M 0.01%
145,193
-4,032
-3% -$93.7K
SCHO icon
648
Schwab Short-Term US Treasury ETF
SCHO
$12.9B
$2.89M 0.01%
118,573
+10,001
+9% +$244K
XEL icon
649
Xcel Energy
XEL
$48B
$2.89M 0.01%
39,096
+1,276
+3% +$101K
PFXF icon
650
VanEck Preferred Securities ex Financials ETF
PFXF
$2.45B
$2.89M 0.01%
163,395
-8,393
-5% -$149K
24 25
26
27 28

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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.