Institutional Manager · CIK 0001533551
Wellesley Asset Management
PORTSMOUTH, NH · File #028-14868
Latest AUM
$672.2M
Positions
54
Top-10 Concentration
40.9%
Filings
11
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | UBER US | 90353TAJ9 | -32,878,000 | -$39.6M | $0 |
| EXITED | HALO US | 40637HAD1 | -23,374,000 | -$27.3M | $0 |
| NEW | SYNA US | SYNA | +25,483,000 | +$27.1M | $0 |
| REDUCE | BMRN US | BMRN | -22,963,000 | -$22.1M | +$303,255 |
| EXITED | ITRI US | 465741AN6 | -20,657,000 | -$21.8M | $0 |
| REDUCE | LIVN US | LIVN | -18,534,000 | -$21.3M | +$3.6M |
| REDUCE | AMPH US | AMPH | -22,407,000 | -$20.7M | +$537,822 |
| ADD | ITRI US | ITRI | +18,969,000 | +$19.4M | -$446,417 |
| EXITED | DKNG US | 26142RAB0 | -20,104,000 | -$18.0M | $0 |
| REDUCE | F US | 345370CZ1 | -17,020,000 | -$17.8M | +$960,004 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORT (Amended)Q/E Dec 202554 pos · $960.8M
- 13F HOLDINGS REPORTQ/E Dec 202554 pos · $672.2M
- 13F HOLDINGS REPORTQ/E Sep 202556 pos · $998.8M
- 13F HOLDINGS REPORTQ/E Jun 202564 pos · $1.05B
- 13F HOLDINGS REPORTQ/E Mar 202561 pos · $1.00B
- 13F HOLDINGS REPORTQ/E Dec 202458 pos · $962.3M
- 13F HOLDINGS REPORTQ/E Sep 202449 pos · $1.03B
- 13F HOLDINGS REPORTQ/E Jun 202448 pos · $944.5M
- 13F HOLDINGS REPORTQ/E Mar 202455 pos · $990.3M
- 13F HOLDINGS REPORTQ/E Dec 202337 pos · $1.01B
- 13F HOLDINGS REPORT (Amended)Q/E Dec 202336 pos · $1.00B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | BOX US | BXCAP | 44,891,000 | $43.4M | 4.57% |
| 2 | HAE US | HAE | 40,842,000 | $42.4M | 4.47% |
| 3 | SYNA US | SYNA | 39,166,000 | $41.7M | 4.40% |
| 4 | LIVN US | LIVN | 34,131,000 | $39.3M | 4.14% |
| 5 | F US | 345370CZ1 | 37,047,000 | $38.7M | 4.08% |
| 6 | PCG US | PCG-PX | 36,998,000 | $38.2M | 4.03% |
| 7 | ITRI US | ITRI | 36,131,000 | $36.9M | 3.89% |
| 8 | GBX US | 393657AM3 | 33,446,000 | $36.3M | 3.83% |
| 9 | BL US | BL | 34,564,000 | $36.2M | 3.81% |
| 10 | VSH US | VSH | 38,981,000 | $35.5M | 3.75% |
| 11 | MTH US | MTH | 34,144,000 | $33.7M | 3.55% |
| 12 | ON US | ON | 32,959,000 | $31.6M | 3.33% |
| 13 | FOUR US | 82452JAD1 | 31,430,000 | $30.1M | 3.17% |
| 14 | AKAM US | AKAM | 29,398,000 | $29.4M | 3.10% |
| 15 | RGEN US | RGEN | 24,122,000 | $26.5M | 2.80% |
| 16 | AMPH US | AMPH | 28,473,000 | $26.3M | 2.77% |
| 17 | WGO US | 974637AF7 | 27,463,000 | $25.9M | 2.73% |
| 18 | LYFT US | LYFT | 21,186,000 | $25.8M | 2.72% |
| 19 | PSN US | PSN | 23,772,000 | $24.6M | 2.59% |
| 20 | GPN US | 37940XAU6 | 26,844,000 | $24.1M | 2.54% |