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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 | |
|---|---|---|---|---|---|---|
1226
Elanco Animal Health
ELAN
$11.1B
| $382K | ﹤0.01% |
16,874
-18,201
| -52% | -$396K |
|
1227
iShares MSCI Intl Quality Factor ETF
IQLT
$14.2B
| $382K | ﹤0.01% |
8,400
+721
| +9% | +$32.3K |
|
1228
Spire
SR
$4.79B
| $381K | ﹤0.01% |
4,609
+49
| +1% | +$4.18K |
|
1229
GATX Corp
GATX
$6.23B
| $380K | ﹤0.01% |
2,238
+196
| +10% | +$32.3K |
|
1230
MasTec
MTZ
$21.5B
| $379K | ﹤0.01% |
1,744
-734
| -30% | -$154K |
|
1231
Western Midstream Partners
WES
$19.6B
| $379K | ﹤0.01% |
9,590
+330
| +4% | +$12.8K |
|
1232
Vanguard Global ex-US Real Estate ETF
VNQI
$3.52B
| $375K | ﹤0.01% |
8,188
-897
| -10% | -$42.4K |
|
1233
iShares Ultra Short Duration Bond Active ETF
ICSH
$8.4B
| $372K | ﹤0.01% |
7,348
+2
| +0% | +$101 |
|
1234
ProShares Russell 2000 Dividend Growers ETF
SMDV
$702M
| $370K | ﹤0.01% |
5,606
-124
| -2% | -$8.24K |
|
1235
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$14.9B
| $370K | ﹤0.01% |
3,841
+1,521
| +66% | +$146K |
|
1236
Allegion
ALLE
$14.1B
| $368K | ﹤0.01% |
2,311
+403
| +21% | +$67.2K |
|
1237
WisdomTree US SmallCap Earnings Fund
EES
$727M
| $365K | ﹤0.01% |
6,419
-227
| -3% | -$12.7K |
|
1238
Expedia Group
EXPE
$37.7B
| $364K | ﹤0.01% |
1,284
+115
| +10% | +$28.4K |
|
1239
NeoGenomics
NEO
$2.14B
| $364K | ﹤0.01% |
30,927
-4,774
| -13% | -$51.5K |
|
1240
Baxter International
BAX
$14.4B
| $364K | ﹤0.01% |
19,027
-2,204
| -10% | -$44.1K |
|
1241
Joby Aviation
JOBY
$8.71B
| $363K | ﹤0.01% |
27,477
-1,472
| -5% | -$22.6K |
|
1242
Corpay
CPAY
$26.2B
| $362K | ﹤0.01% |
1,203
-124
| -9% | -$36K |
|
1243
Genpact
G
$5.73B
| $362K | ﹤0.01% |
7,734
-1,257
| -14% | -$54.4K |
|
1244
Toronto Dominion Bank
TD
$200B
| $361K | ﹤0.01% |
3,837
+41
| +1% | +$3.46K |
|
1245
LyondellBasell Industries
LYB
$20.2B
| $360K | ﹤0.01% |
8,325
-2,670
| -24% | -$121K |
|
1246
SPS Commerce
SPSC
$2.69B
| $358K | ﹤0.01% |
4,013
-6,752
| -63% | -$626K |
|
1247
H.B. Fuller
FUL
$3.29B
| $357K | ﹤0.01% |
6,005
-1,760
| -23% | -$103K |
|
1248
First Horizon
FHN
$12B
| $355K | ﹤0.01% |
14,840
+121
| +0.8% | +$2.7K |
|
1249
iShares US Infrastructure ETF
IFRA
$4.58B
| $353K | ﹤0.01% |
6,706
+385
| +6% | +$20.3K |
|
1250
Leggett & Platt
LEG
$1.29B
| $353K | ﹤0.01% |
32,068
+68
| +0.2% | +$669 |
|
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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.