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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
IP icon
526
International Paper
IP
$21.9B
$4.8M 0.01%
121,901
+51,229
+72% +$2.11M
TEM
527
Tempus AI
TEM
$9.93B
$4.79M 0.01%
81,197
+10,256
+14% +$802K
XLY icon
528
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$23.8B
$4.77M 0.01%
39,965
-18,119
-31% -$2.15M
ADM icon
529
Archer Daniels Midland
ADM
$38.8B
$4.76M 0.01%
82,882
-6,379
-7% -$381K
IBN icon
530
ICICI Bank
IBN
$108B
$4.72M 0.01%
158,327
-1,548
-1% -$47.5K
FITB
531
Fifth Third Bancorp
FITB
$51.8B
$4.72M 0.01%
100,782
+31,113
+45% +$1.37M
HDV
532
iShares Core High Dividend ETF
HDV
$15B
$4.71M 0.01%
193,570
+5,445
+3% +$132K
ARCC icon
533
Ares Capital
ARCC
$14.3B
$4.7M 0.01%
232,467
+37,060
+19% +$748K
BL icon
534
BlackLine
BL
$1.7B
$4.7M 0.01%
85,023
+1,862
+2% +$103K
COP icon
535
ConocoPhillips
COP
$148B
$4.7M 0.01%
50,203
-2,114
-4% -$191K
ELF icon
536
e.l.f. Beauty
ELF
$5.62B
$4.67M 0.01%
61,402
-6,625
-10% -$652K
FNDX icon
537
Schwab Fundamental US Large Company Index ETF
FNDX
$27.4B
$4.67M 0.01%
171,515
+97,222
+131% +$2.6M
BNY
538
Bank of New York Mellon
BNY
$108B
$4.66M 0.01%
40,139
-3,418
-8% -$378K
EWJ icon
539
iShares MSCI Japan ETF
EWJ
$22.6B
$4.66M 0.01%
57,693
+5,007
+10% +$411K
NTNX icon
540
Nutanix
NTNX
$17.4B
$4.62M 0.01%
89,326
-3,454
-4% -$211K
TREX icon
541
Trex
TREX
$4.91B
$4.6M 0.01%
131,215
-341,931
-72% -$13.8M
WMB icon
542
Williams Companies
WMB
$87.9B
$4.55M 0.01%
75,774
+6,034
+9% +$365K
PSEP icon
543
Innovator US Equity Power Buffer ETF September
PSEP
$841M
$4.55M 0.01%
104,096
-208
-0.2% -$8.99K
III icon
544
Information Services Group
III
$251M
$4.51M 0.01%
779,777
-62,422
-7% -$350K
SHEL icon
545
Shell
SHEL
$249B
$4.51M 0.01%
61,331
-1,144
-2% -$84.3K
MEDP icon
546
Medpace
MEDP
$16.8B
$4.49M 0.01%
8,000
+23
+0.3% +$13.1K
CMCSA icon
547
Comcast
CMCSA
$89.4B
$4.48M 0.01%
149,829
-55,374
-27% -$1.58M
PTLO icon
548
Portillo's
PTLO
$325M
$4.47M 0.01%
985,020
-278,896
-22% -$1.46M
BIDU icon
549
Baidu
BIDU
$37.1B
$4.47M 0.01%
34,213
+2,188
+7% +$272K
EVR icon
550
Evercore
EVR
$11.5B
$4.46M 0.01%
13,118
+181
+1% +$58.2K
20 21
22
23 24

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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.