BAMCO INC /NY/
"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 +4.6% per quarter — versus +2.7% per quarter from simply owning every 13F stock. It beat that baseline in only 56.2% of quarters (excess t = 0.29, 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 326 · 2026 Q1
| Ticker | Value | Weight | QoQ |
|---|---|---|---|
| TSLA | $4.4B | | HOLD |
| ACGL | $1.6B | | TRIM |
| MSCI | $1.5B | | TRIM |
| GWRE | $987M | | ADD |
| IT | $937M | | ADD |
| IDXX | $918M | | TRIM |
| H | $912M | | ADD |
| FIGS | $886M | | HOLD |
| FDS | $815M | | ADD |
| CHH | $796M | | ADD |
| RRR | $716M | | ADD |
| SCHW | $701M | | ADD |
| KNSL | $693M | | ADD |
| CSGP | $658M | | TRIM |
| MTN | $647M | | ADD |
| SPOT | $640M | | ADD |
| SHOP | $560M | | ADD |
| NVDA | $509M | | TRIM |
| VRSK | $477M | | ADD |
| BIRK | $336M | | ADD |
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.