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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
(-0.82%)
Cap. Flow
-$212M
Cap. Flow
% of AUM
-0.57%
Top 10 Holdings %
Top 10 Hldgs %
27.41%
Holding
1,963
New
120
Increased
759
Reduced
753
Closed
96
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
BWX Technologies
BWXT
|
+$46.6M |
| 2 |
Meta Platforms (Facebook)
META
|
+$38.3M |
| 3 |
ServiceNow
NOW
|
+$37.6M |
| 4 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$32.4M |
| 5 |
SPDR Gold Trust
GLD
|
+$29.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
FISV
Fiserv Inc
FISV
|
+$114M |
| 2 |
CoStar Group
CSGP
|
+$78.3M |
| 3 |
CWAN
Clearwater Analytics
CWAN
|
+$75.3M |
| 4 |
Pool Corp
POOL
|
+$54M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
1001
Krystal Biotech
KRYS
$9.74B
| $783K | ﹤0.01% |
3,177
-1,575
| -33% | -$331K |
|
1002
MediaAlpha
MAX
$807M
| $779K | ﹤0.01% |
60,146
-6,051
| -9% | -$73.9K |
|
|
USAR
1003
USA Rare Earth Inc
USAR
$4.67B
| $778K | ﹤0.01% |
+65,409
| New | +$1.25M |
|
1004
iShares US Healthcare ETF
IYH
$3.76B
| $775K | ﹤0.01% |
11,910
+2,274
| +24% | +$143K |
|
1005
Sun Communities
SUI
$14.5B
| $774K | ﹤0.01% |
6,247
+71
| +1% | +$8.89K |
|
1006
Essential Utilities
WTRG
$11.2B
| $770K | ﹤0.01% |
20,066
-1,999
| -9% | -$78.7K |
|
1007
Occidental Petroleum
OXY
$59B
| $768K | ﹤0.01% |
18,670
-3,302
| -15% | -$138K |
|
|
NNE
1008
Nano Nuclear Energy
NNE
$1.01B
| $767K | ﹤0.01% |
31,960
+100
| +0.3% | +$3.83K |
|
1009
Invesco S&P 100 Equal Weight ETF
EQWL
$2.79B
| $765K | ﹤0.01% |
6,477
+6,077
| +1,519% | +$708K |
|
1010
Dime Commercial Bancshares
DCOM
$1.79B
| $762K | ﹤0.01% |
25,328
| – | – |
|
1011
AutoNation
AN
$6.92B
| $761K | ﹤0.01% |
3,685
-674
| -15% | -$140K |
|
1012
iShares Global Tech ETF
IXN
$9.24B
| $754K | ﹤0.01% |
7,179
+770
| +12% | +$81.3K |
|
1013
Nu Holdings
NU
$66.1B
| $754K | ﹤0.01% |
45,014
+1,481
| +3% | +$23.8K |
|
1014
NRG Energy
NRG
$25.5B
| $752K | ﹤0.01% |
4,723
+391
| +9% | +$64.7K |
|
1015
Ferrari
RACE
$72.4B
| $746K | ﹤0.01% |
2,020
-12
| -0.6% | -$4.8K |
|
1016
The Mosaic Company
MOS
$7.45B
| $746K | ﹤0.01% |
30,967
-3,195
| -9% | -$86K |
|
1017
Old National Bancorp
ONB
$10.2B
| $741K | ﹤0.01% |
33,205
-6,809
| -17% | -$147K |
|
1018
Dianthus Therapeutics
DNTH
$6.16B
| $739K | ﹤0.01% |
17,925
+2,050
| +13% | +$79.5K |
|
1019
Campbell Soup
CPB
$6.71B
| $737K | ﹤0.01% |
26,431
-5,982
| -18% | -$180K |
|
1020
iPath Select MLP ETN
ATMP
$636M
| $733K | ﹤0.01% |
25,487
-1,000
| -4% | -$28.4K |
|
1021
John Hancock Multifactor Mid Cap ETF
JHMM
$6.14B
| $728K | ﹤0.01% |
11,116
+768
| +7% | +$49.9K |
|
1022
Tenable Holdings
TENB
$4.14B
| $723K | ﹤0.01% |
30,735
-16,775
| -35% | -$458K |
|
1023
Mitsubishi UFJ Financial
MUFG
$250B
| $716K | ﹤0.01% |
45,134
+392
| +0.9% | +$6.06K |
|
1024
Pan American Silver
PAAS
$21.8B
| $714K | ﹤0.01% |
13,786
-14,574
| -51% | -$610K |
|
1025
MP Materials
MP
$9.69B
| $713K | ﹤0.01% |
14,109
+1,516
| +12% | +$96.1K |
|
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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.