Institutional Manager · CIK 0001017918
BAMCO INC /NY/
NEW YORK, NY · File #028-04011
Latest AUM
$36.91B
Positions
327
Top-10 Concentration
58.2%
Filings
9
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 |
|---|---|---|---|---|---|
| ADD | FACTSET RESH SYS INC | 303075105 | +1,069,786 | +$310.4M | +$6.7M |
| ADD | MSCI INC | MSCI | +361,630 | +$207.5M | +$15.1M |
| ADD | CHOICE HOTELS INTL INC | 169905106 | +2,026,679 | +$193.1M | -$62.4M |
| REDUCE | GAMING & LEISURE PPTYS INC | 36467J108 | -3,285,200 | -$146.8M | -$9.9M |
| EXITED | LIBERTY MEDIA CORP DEL | 531229722 | -1,458,910 | -$141.5M | $0 |
| NEW | LIBERTY LIVE HOLDINGS INC | LLYVK | +1,613,666 | +$134.2M | $0 |
| REDUCE | EXACT SCIENCES CORP | 30063P105 | -1,184,503 | -$120.3M | +$100.2M |
| REDUCE | VAIL RESORTS INC | MTN | -892,764 | -$118.6M | -$95.6M |
| REDUCE | COHEN & STEERS INC | CNS | -1,563,311 | -$98.1M | -$4.9M |
| REDUCE | METTLER TOLEDO INTERNATIONAL | MTD | -65,018 | -$90.6M | +$35.2M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025327 pos · $36.91B
- 13F HOLDINGS REPORTQ/E Sep 2025330 pos · $37.71B
- 13F HOLDINGS REPORTQ/E Jun 2025306 pos · $36.89B
- 13F HOLDINGS REPORTQ/E Mar 2025314 pos · $34.05B
- 13F HOLDINGS REPORTQ/E Dec 2024316 pos · $38.69B
- 13F HOLDINGS REPORTQ/E Sep 2024328 pos · $37.70B
- 13F HOLDINGS REPORTQ/E Jun 2024329 pos · $34.92B
- 13F HOLDINGS REPORTQ/E Mar 2024332 pos · $37.52B
- 13F HOLDINGS REPORTQ/E Dec 2023334 pos · $34.42B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | TESLA INC | TSLA | 11,927,475 | $5.36B | 19.64% |
| 2 | ARCH CAP GROUP LTD | G0450A105 | 17,987,505 | $1.73B | 6.32% |
| 3 | MSCI INC | MSCI | 2,755,747 | $1.58B | 5.79% |
| 4 | COSTAR GROUP INC | CSGP | 19,498,099 | $1.31B | 4.80% |
| 5 | IDEXX LABS INC | 45168D104 | 1,798,041 | $1.22B | 4.45% |
| 6 | GARTNER INC | IT | 4,212,957 | $1.06B | 3.89% |
| 7 | GUIDEWIRE SOFTWARE INC | GWRE | 5,147,550 | $1.03B | 3.79% |
| 8 | HYATT HOTELS CORP | H | 6,106,485 | $979.0M | 3.58% |
| 9 | FACTSET RESH SYS INC | 303075105 | 2,888,845 | $838.3M | 3.07% |
| 10 | RED ROCK RESORTS INC | RRR | 12,519,892 | $775.6M | 2.84% |
| 11 | SCHWAB CHARLES CORP | SCHW-PJ | 7,060,309 | $705.4M | 2.58% |
| 12 | CHOICE HOTELS INTL INC | 169905106 | 7,386,575 | $703.6M | 2.58% |
| 13 | KINSALE CAP GROUP INC | 49714P108 | 1,781,201 | $696.7M | 2.55% |
| 14 | FIGS INC | FIGS | 59,959,449 | $681.1M | 2.49% |
| 15 | VAIL RESORTS INC | MTN | 4,809,928 | $638.8M | 2.34% |
| 16 | SPOTIFY TECHNOLOGY S A | SPOT | 997,291 | $579.1M | 2.12% |
| 17 | NVIDIA CORPORATION | NVDA | 2,988,943 | $557.4M | 2.04% |
| 18 | SHOPIFY INC | SHOP | 2,288,270 | $368.3M | 1.35% |
| 19 | BIRKENSTOCK HOLDING PLC | BIRK | 7,966,037 | $325.8M | 1.19% |
| 20 | INTERACTIVE BROKERS GROUP IN | 45841N107 | 4,643,376 | $298.6M | 1.09% |