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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
(-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 | |
|---|---|---|---|---|---|---|
1151
Viasat
VSAT
$11.7B
| $500K | ﹤0.01% |
+14,502
| New | +$512K |
|
1152
Goldman Sachs ActiveBeta US Large Cap Equity ETF
GSLC
$16B
| $498K | ﹤0.01% |
3,762
+446
| +13% | +$58.5K |
|
1153
Butterfly Network
BFLY
$2.58B
| $492K | ﹤0.01% |
129,500
+1,000
| +0.8% | +$2.72K |
|
1154
Aecom
ACM
$9.42B
| $491K | ﹤0.01% |
5,153
-8,182
| -61% | -$962K |
|
|
THW
1155
abrdn World Healthcare Fund
THW
$557M
| $489K | ﹤0.01% |
38,300
| – | – |
|
1156
abrdn Physical Precious Metals Basket Shares ETF
GLTR
$2.71B
| $485K | ﹤0.01% |
2,361
+292
| +14% | +$53.6K |
|
1157
Vanguard Materials ETF
VAW
$3.1B
| $481K | ﹤0.01% |
2,319
-3
| -0.1% | -$605 |
|
|
BMNR
1158
BitMine Immersion Technologies
BMNR
$10.9B
| $480K | ﹤0.01% |
17,665
+9,109
| +106% | +$369K |
|
1159
Lincoln Electric
LECO
$15.1B
| $478K | ﹤0.01% |
1,994
+132
| +7% | +$31.3K |
|
1160
ImmunityBio
IBRX
$7.94B
| $476K | ﹤0.01% |
240,214
| – | – |
|
1161
UBS Group
UBS
$177B
| $475K | ﹤0.01% |
10,264
+1,198
| +13% | +$48.4K |
|
1162
Privia Health
PRVA
$2.86B
| $474K | ﹤0.01% |
19,999
+400
| +2% | +$9.74K |
|
1163
iShares US Consumer Staples ETF
IYK
$1.43B
| $472K | ﹤0.01% |
7,056
+131
| +2% | +$8.89K |
|
1164
State Street SPDR Portfolio High Yield Bond ETF
SPHY
$12B
| $469K | ﹤0.01% |
19,798
-2,405
| -11% | -$57K |
|
1165
Clean Harbors
CLH
$16.4B
| $466K | ﹤0.01% |
1,988
-45
| -2% | -$10.3K |
|
1166
Invesco DB Commodity Index Tracking Fund
DBC
$1.72B
| $466K | ﹤0.01% |
20,837
-11,241
| -35% | -$256K |
|
1167
Principal Exchange-Traded Funds Principal US Mega-Cap ETF
USMC
$3.69B
| $466K | ﹤0.01% |
6,805
+1,454
| +27% | +$99.4K |
|
1168
Rambus
RMBS
$10.4B
| $465K | ﹤0.01% |
5,055
+155
| +3% | +$15.3K |
|
1169
Raymond James Financial
RJF
$34.5B
| $464K | ﹤0.01% |
2,888
+650
| +29% | +$105K |
|
1170
First Community Corp
FCCO
$318M
| $463K | ﹤0.01% |
15,621
+1
| +0% | +$28 |
|
1171
Pinduoduo
PDD
$132B
| $463K | ﹤0.01% |
4,079
+1,588
| +64% | +$197K |
|
1172
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.18B
| $462K | ﹤0.01% |
4,901
+415
| +9% | +$39.2K |
|
1173
Gold Fields
GFI
$36.8B
| $460K | ﹤0.01% |
10,545
+5,210
| +98% | +$218K |
|
1174
Popular Inc
BPOP
$11.1B
| $459K | ﹤0.01% |
3,687
-63
| -2% | -$7.45K |
|
1175
Lincoln National
LNC
$8.75B
| $459K | ﹤0.01% |
10,305
+333
| +3% | +$13.9K |
|
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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.