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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
AYI icon
576
Acuity Brands
AYI
$10.6B
$4.03M 0.01%
11,198
-90
-0.8% -$32.5K
B
577
Barrick Mining
B
$68.5B
$3.98M 0.01%
91,371
-46,453
-34% -$1.74M
TTAN
578
ServiceTitan Inc
TTAN
$8.29B
$3.96M 0.01%
37,173
+4,313
+13% +$421K
SPEM icon
579
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$17.7B
$3.95M 0.01%
84,455
+4,416
+6% +$208K
AIOT
580
PowerFleet Inc
AIOT
$411M
$3.94M 0.01%
740,122
-111,230
-13% -$569K
ENVX icon
581
Enovix
ENVX
$1.01B
$3.93M 0.01%
537,153
+60,703
+13% +$588K
PGX icon
582
Invesco Preferred ETF
PGX
$3.76B
$3.92M 0.01%
348,977
-61,053
-15% -$696K
CAH icon
583
Cardinal Health
CAH
$55.5B
$3.91M 0.01%
19,023
-2,144
-10% -$403K
ALNY icon
584
Alnylam Pharmaceuticals
ALNY
$29B
$3.89M 0.01%
9,774
-470
-5% -$208K
FNF icon
585
Fidelity National Financial
FNF
$12.9B
$3.88M 0.01%
71,082
-4,417
-6% -$251K
CASY icon
586
Casey's General Stores
CASY
$31.6B
$3.86M 0.01%
6,990
-325
-4% -$179K
KMX icon
587
CarMax
KMX
$8.34B
$3.84M 0.01%
99,251
-210,346
-68% -$8.41M
ADSK icon
588
Autodesk
ADSK
$54.1B
$3.83M 0.01%
12,950
+320
+3% +$96.8K
CCOI icon
589
Cogent Communications
CCOI
$528M
$3.83M 0.01%
177,655
-63,141
-26% -$1.86M
CHKP icon
590
Check Point Software Technologies
CHKP
$13.4B
$3.81M 0.01%
20,554
+2,777
+16% +$537K
HLNE icon
591
Hamilton Lane
HLNE
$5.53B
$3.78M 0.01%
28,150
-1,449
-5% -$182K
HCA icon
592
HCA Healthcare
HCA
$89.6B
$3.77M 0.01%
8,082
-808
-9% -$375K
CCJ icon
593
Cameco
CCJ
$42.4B
$3.7M 0.01%
40,463
+16,065
+66% +$1.45M
KAUG
594
Innovator U.S. Small Cap Power Buffer ETF - August
KAUG
$63.4M
$3.7M 0.01%
139,483
-1,900
-1% -$49.9K
LDOS icon
595
Leidos
LDOS
$17.5B
$3.68M 0.01%
20,424
-2,424
-11% -$459K
HTGC icon
596
Hercules Capital
HTGC
$3.21B
$3.68M 0.01%
195,593
-7,612
-4% -$137K
KKR icon
597
KKR & Co
KKR
$93.2B
$3.67M 0.01%
28,783
-2,004
-7% -$249K
ROST icon
598
Ross Stores
ROST
$81.7B
$3.66M 0.01%
20,322
+208
+1% +$34.7K
SUB icon
599
iShares Short-Term National Muni Bond ETF
SUB
$11.4B
$3.65M 0.01%
34,246
-13
-0% -$1.39K
PRAA icon
600
PRA Group
PRAA
$723M
$3.65M 0.01%
206,241
-6,389
-3% -$99.5K
22 23
24
25 26

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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.