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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 | |
|---|---|---|---|---|---|---|
|
GRAL
1176
GRAIL Inc
GRAL
$3.34B
| $458K | ﹤0.01% |
5,356
| – | – |
|
1177
Murphy USA
MUSA
$10.2B
| $458K | ﹤0.01% |
1,134
+51
| +5% | +$19.6K |
|
1178
KraneShares CSI China Internet ETF
KWEB
$5.76B
| $457K | ﹤0.01% |
13,429
-51
| -0.4% | -$1.96K |
|
1179
Vontier
VNT
$4.63B
| $455K | ﹤0.01% |
12,251
-165
| -1% | -$6.31K |
|
1180
WisdomTree US MidCap Fund
EZM
$952M
| $454K | ﹤0.01% |
6,792
+284
| +4% | +$18.8K |
|
1181
Hayward Holdings
HAYW
$3.27B
| $453K | ﹤0.01% |
29,319
+489
| +2% | +$7.73K |
|
1182
Global X S&P 500 Covered Call ETF
XYLD
$3.28B
| $453K | ﹤0.01% |
11,141
-5,843
| -34% | -$234K |
|
1183
Banco Bilbao Vizcaya Argentaria
BBVA
$156B
| $445K | ﹤0.01% |
19,081
-8,103
| -30% | -$169K |
|
1184
Crane Co
CR
$12.7B
| $442K | ﹤0.01% |
2,396
+247
| +11% | +$45.8K |
|
1185
Scholar Rock
SRRK
$6.32B
| $441K | ﹤0.01% |
+10,009
| New | +$375K |
|
1186
Innovator US Equity Buffer ETF October
BOCT
$289M
| $438K | ﹤0.01% |
8,857
| – | – |
|
1187
Atmos Energy
ATO
$28.4B
| $437K | ﹤0.01% |
2,608
+462
| +22% | +$79.9K |
|
1188
Barclays
BCS
$94.2B
| $437K | ﹤0.01% |
17,158
+4,724
| +38% | +$105K |
|
1189
Inspire Medical Systems
INSP
$1.73B
| $436K | ﹤0.01% |
4,732
-133
| -3% | -$12.7K |
|
1190
Arch Capital
ACGL
$33.5B
| $434K | ﹤0.01% |
4,520
+1,286
| +40% | +$118K |
|
1191
Teva Pharmaceuticals
TEVA
$42.1B
| $432K | ﹤0.01% |
13,853
-4,585
| -25% | -$113K |
|
1192
Titan International
TWI
$457M
| $431K | ﹤0.01% |
55,100
| – | – |
|
1193
Sanmina
SANM
$10.7B
| $430K | ﹤0.01% |
2,862
-163
| -5% | -$24.1K |
|
1194
State Street SPDR MSCI ACWI ex-US ETF
CWI
$2.85B
| $429K | ﹤0.01% |
11,938
-862
| -7% | -$30.5K |
|
1195
Moog Inc Class A
MOG.A
$13B
| $428K | ﹤0.01% |
1,756
+16
| +0.9% | +$3.51K |
|
1196
JPMorgan Ultra-Short Municipal Income ETF
JMST
$7.14B
| $427K | ﹤0.01% |
8,380
-3,470
| -29% | -$177K |
|
1197
First Financial Corp
THFF
$962M
| $423K | ﹤0.01% |
7,003
+3
| +0% | +$173 |
|
1198
Steris
STE
$23.3B
| $423K | ﹤0.01% |
1,668
-103
| -6% | -$25.9K |
|
|
MRP
1199
Millrose Properties Inc
MRP
$4.78B
| $419K | ﹤0.01% |
14,016
+308
| +2% | +$9.66K |
|
1200
Advanced Energy
AEIS
$12.6B
| $416K | ﹤0.01% |
1,986
-235
| -11% | -$47.8K |
|
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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.