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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
JLL icon
76
Jones Lang LaSalle
JLL
$16.7B
$117M 0.31%
346,764
+63,272
+22% +$19.8M
XOM icon
77
ExxonMobil
XOM
$634B
$117M 0.31%
968,137
+4,863
+0.5% +$564K
VTI icon
78
Vanguard Morningstar Total Stock Market ETF
VTI
$691B
$113M 0.3%
338,130
+46,657
+16% +$15.5M
IUSV icon
79
iShares Core S&P US Value ETF
IUSV
$27.7B
$112M 0.3%
1,093,999
+51,657
+5% +$5.24M
ADBE icon
80
Adobe
ADBE
$105B
$111M 0.3%
318,448
-74,865
-19% -$25.5M
SPGI icon
81
S&P Global
SPGI
$120B
$110M 0.3%
211,333
-3,176
-1% -$1.57M
WM icon
82
Waste Management
WM
$91B
$110M 0.29%
499,048
+14,451
+3% +$3.08M
UNP icon
83
Union Pacific
UNP
$174B
$109M 0.29%
470,374
-13,627
-3% -$3.11M
ROK icon
84
Rockwell Automation
ROK
$49B
$109M 0.29%
279,153
-46
-0% -$17.3K
ACN icon
85
Accenture
ACN
$108B
$108M 0.29%
402,199
-45,420
-10% -$11.5M
CRWD icon
86
CrowdStrike
CRWD
$218B
$106M 0.28%
903,280
+1,704
+0.2% +$217K
RSP icon
87
Invesco S&P 500 Equal Weight ETF
RSP
$99.1B
$105M 0.28%
549,986
+139,587
+34% +$26.5M
MCD icon
88
McDonald's
MCD
$195B
$105M 0.28%
343,101
-858
-0.2% -$263K
ORLY icon
89
O'Reilly Automotive
ORLY
$76.3B
$102M 0.27%
1,114,040
+28,587
+3% +$2.79M
CVX icon
90
Chevron
CVX
$366B
$102M 0.27%
666,459
-2,269
-0.3% -$346K
KO icon
91
Coca-Cola
KO
$375B
$102M 0.27%
1,452,843
-68,820
-5% -$4.8M
GLD icon
92
SPDR Gold Trust
GLD
$142B
$101M 0.27%
255,203
+77,040
+43% +$29.4M
AME icon
93
Ametek
AME
$58.2B
$99.8M 0.27%
486,174
-43,099
-8% -$8.39M
LIN icon
94
Linde
LIN
$226B
$99.7M 0.27%
233,766
-5,083
-2% -$2.18M
RBC icon
95
RBC Bearings
RBC
$18B
$99.7M 0.27%
222,235
+9,331
+4% +$3.95M
SHOP icon
96
Shopify
SHOP
$195B
$98.3M 0.26%
610,733
+90,546
+17% +$14.5M
LYV icon
97
Live Nation Entertainment
LYV
$42.1B
$97M 0.26%
680,443
-17,589
-3% -$2.53M
GD icon
98
General Dynamics
GD
$106B
$95.8M 0.26%
284,667
+522
+0.2% +$178K
ORCL icon
99
Oracle
ORCL
$423B
$93.1M 0.25%
477,646
-32,773
-6% -$7.8M
QCOM icon
100
Qualcomm
QCOM
$176B
$92.9M 0.25%
542,992
-36,287
-6% -$6.22M
2 3
4
5 6

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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.