Boston Common Asset Management, LLC
"13F equity value" = market value of this filer's US-listed long equity positions only. It excludes cash, bonds, non-US and short positions, so it understates a fund's true assets under management — often by a lot.
13F holdings are disclosed ~45 days after quarter-end, and they never reveal when within the quarter a fund actually bought. So any 13F-based summary is structurally late and blurred — this applies to every fund, including this one.
We backtested copying it anyway. Buying this fund's new positions the day each filing went public, over 32 quarters, returned +1.6% per quarter — versus +2.7% per quarter from simply owning every 13F stock. It beat that baseline in only 40.6% of quarters (excess t = 0.18, not statistically significant). Its filings tell you what it bought — not what you should buy.
Quarterly compounding, invested quarters only · entry 47 days after quarter-end (when 13F data becomes public)
Top 20 holdings of 186 · 2026 Q1
| Ticker | Value | Weight | QoQ |
|---|---|---|---|
| TSM | $97M | | TRIM |
| NVDA | $70M | | ADD |
| AAPL | $61M | | TRIM |
| MSFT | $53M | | HOLD |
| GOOGL | $40M | | TRIM |
| AVGO | $38M | | ADD |
| GOOG | $37M | | ADD |
| NFLX | $34M | | HOLD |
| V | $29M | | HOLD |
| MS | $26M | | TRIM |
| SPOT | $26M | | ADD |
| VRT | $25M | | TRIM |
| MRK | $24M | | TRIM |
| LLY | $22M | | TRIM |
| CL | $21M | | TRIM |
| HUBB | $20M | | TRIM |
| NUSC | $19M | | TRIM |
| WAB | $19M | | TRIM |
| TJX | $18M | | TRIM |
| CRH | $18M | | TRIM |
QoQ vs previous quarter's share count · NEW = new position · ADD/TRIM = ±2% shares · HOLD = unchanged.
New positions in 2026 Q1
Method & Limitations
Method: a "new position" = held this quarter, absent last quarter (options excluded; stocks with <50 prior holders excluded to filter spin-off artifacts). Entry 47 days after quarter-end — the first day the public could act on the filing. Benchmark = equal-weighted universe of all 13F-held stocks. Limitations: quarterly snapshots can't see intra-quarter trades; survivorship bias — funds that shut down are absent, which flatters the sample. Statistics, not advice.