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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 | |
|---|---|---|---|---|---|---|
751
iShares Core MSCI Total International Stock ETF
IXUS
$60.3B
| $1.95M | 0.01% |
23,038
-811
| -3% | -$68K |
|
|
ZAP
752
Global X U.S. Electrification ETF
ZAP
$467M
| $1.94M | 0.01% |
66,853
+10,664
| +19% | +$320K |
|
753
iShares MSCI EAFE Small-Cap ETF
SCZ
$13.5B
| $1.93M | 0.01% |
24,913
-338
| -1% | -$25.9K |
|
754
First Advantage
FA
$3.64B
| $1.93M | 0.01% |
132,829
-22,120
| -14% | -$312K |
|
755
Rio Tinto
RIO
$165B
| $1.92M | 0.01% |
23,998
+3,435
| +17% | +$247K |
|
756
iShares US Real Estate ETF
IYR
$4.51B
| $1.92M | 0.01% |
20,439
+155
| +0.8% | +$14.8K |
|
757
Vanguard S&P Mid-Cap 400 Growth ETF
IVOG
$1.71B
| $1.91M | 0.01% |
15,855
+1
| +0% | +$120 |
|
758
Innovator US Equity Power Buffer ETF May
PMAY
$817M
| $1.89M | 0.01% |
47,721
-110
| -0.2% | -$4.3K |
|
759
Brown & Brown
BRO
$23.9B
| $1.88M | 0.01% |
23,545
-430
| -2% | -$35.9K |
|
|
CRWV
760
CoreWeave
CRWV
$48.1B
| $1.87M | 0.01% |
26,166
+11,496
| +78% | +$1.17M |
|
761
eBay
EBAY
$47.6B
| $1.87M | 0.01% |
21,469
-232
| -1% | -$20.1K |
|
762
iShares ESG Aware MSCI USA ETF
ESGU
$18.4B
| $1.87M | 0.01% |
12,547
+473
| +4% | +$69.9K |
|
763
RPM International
RPM
$15B
| $1.84M | ﹤0.01% |
17,733
+180
| +1% | +$19.5K |
|
764
Deutsche Bank
DB
$71.9B
| $1.84M | ﹤0.01% |
47,796
+24,530
| +105% | +$885K |
|
765
Uranium Energy
UEC
$5.69B
| $1.84M | ﹤0.01% |
157,150
-1,850
| -1% | -$24.3K |
|
766
Vital Farms
VITL
$501M
| $1.83M | ﹤0.01% |
57,396
+37,013
| +182% | +$1.3M |
|
767
iShares S&P Mid-Cap 400 Value ETF
IJJ
$9.05B
| $1.83M | ﹤0.01% |
13,891
-82
| -0.6% | -$10.7K |
|
768
EPAM Systems
EPAM
$5.15B
| $1.82M | ﹤0.01% |
8,875
-3,139
| -26% | -$560K |
|
769
Innovator Growth-100 Power Buffer ETF April
NAPR
$213M
| $1.81M | ﹤0.01% |
33,759
-820
| -2% | -$43.5K |
|
770
M&T Bank
MTB
$36.6B
| $1.81M | ﹤0.01% |
8,963
-841
| -9% | -$161K |
|
771
IQVIA
IQV
$40.1B
| $1.8M | ﹤0.01% |
7,982
+831
| +12% | +$181K |
|
772
Cadence Design Systems
CDNS
$90B
| $1.8M | ﹤0.01% |
5,755
+790
| +16% | +$258K |
|
|
CRCL
773
Circle Internet Group
CRCL
$18.1B
| $1.8M | ﹤0.01% |
+22,665
| New | +$2.34M |
|
774
Vanguard Morningstar Large-Cap ETF
VV
$54.4B
| $1.79M | ﹤0.01% |
5,699
+535
| +10% | +$167K |
|
775
Keysight
KEYS
$58.5B
| $1.78M | ﹤0.01% |
8,782
-2,317
| -21% | -$430K |
|
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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.