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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 | |
|---|---|---|---|---|---|---|
|
SF
1076
Stifel
SF
$12.6B
| $605K | ﹤0.01% |
7,250
+243
| +3% | +$19.4K |
|
1077
First Trust Financials AlphaDEX Fund
FXO
$1.14B
| $602K | ﹤0.01% |
9,980
-411
| -4% | -$24.2K |
|
1078
iShares 3-7 Year Treasury Bond ETF
IEI
$17.7B
| $601K | ﹤0.01% |
5,037
-134
| -3% | -$16K |
|
1079
Globus Medical
GMED
$11.6B
| $599K | ﹤0.01% |
6,860
-128
| -2% | -$9.71K |
|
1080
Invesco Large Cap Growth ETF
PWB
$2.39B
| $597K | ﹤0.01% |
4,700
+987
| +27% | +$125K |
|
1081
Textron
TXT
$15.3B
| $597K | ﹤0.01% |
6,844
+2,089
| +44% | +$175K |
|
1082
JPMorgan BetaBuilders Developed Asia Pacific-ex Japan ETF
BBAX
$6.85B
| $597K | ﹤0.01% |
10,596
-1,520
| -13% | -$85.4K |
|
1083
Golub Capital BDC
GBDC
$3.41B
| $595K | ﹤0.01% |
43,826
| – | – |
|
1084
IDEX
IEX
$17.2B
| $586K | ﹤0.01% |
3,293
-291
| -8% | -$49.7K |
|
1085
State Street SPDR S&P Regional Banking ETF
KRE
$4.56B
| $585K | ﹤0.01% |
9,020
-57,797
| -87% | -$3.63M |
|
1086
InterContinental Hotels
IHG
$23B
| $583K | ﹤0.01% |
+4,141
| New | +$538K |
|
1087
Madrigal Pharmaceuticals
MDGL
$11.9B
| $582K | ﹤0.01% |
1,000
| – | – |
|
1088
Flywire
FLYW
$2.11B
| $581K | ﹤0.01% |
+41,021
| New | +$562K |
|
1089
Henry Schein
HSIC
$9.82B
| $579K | ﹤0.01% |
7,661
-628
| -8% | -$44.2K |
|
1090
Rivian
RIVN
$23.7B
| $578K | ﹤0.01% |
29,336
-2,098
| -7% | -$33.3K |
|
1091
Synchrony
SYF
$25.4B
| $577K | ﹤0.01% |
6,911
+794
| +13% | +$60.7K |
|
1092
Ituran Location and Control
ITRN
$1.02B
| $575K | ﹤0.01% |
13,376
+42
| +0.3% | +$1.65K |
|
|
TWFG
1093
TWFG Inc
TWFG
$359M
| $572K | ﹤0.01% |
19,896
-8,186
| -29% | -$223K |
|
1094
Kodiak Gas Services
KGS
$6.21B
| $570K | ﹤0.01% |
+15,235
| New | +$539K |
|
1095
Vicor
VICR
$9.63B
| $569K | ﹤0.01% |
5,191
+281
| +6% | +$23.9K |
|
1096
Revvity
RVTY
$12.9B
| $569K | ﹤0.01% |
5,876
-1,825
| -24% | -$175K |
|
1097
Sarepta Therapeutics
SRPT
$1.81B
| $567K | ﹤0.01% |
26,333
-7,299
| -22% | -$154K |
|
1098
Plains All American Pipeline
PAA
$16.4B
| $566K | ﹤0.01% |
31,505
| – | – |
|
1099
ProShares Ultra Financials
UYG
$851M
| $564K | ﹤0.01% |
6,140
| – | – |
|
1100
HUB Group
HUBG
$2.9B
| $563K | ﹤0.01% |
13,205
-793
| -6% | -$30.1K |
|
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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.