BAMCO INC /NY/ — 13F Holdings & Portfolio
CIK 1017918 · latest 13F-HR filed 2026-05-15
BAMCO INC /NY/ manages $33.13B in 13F-reported U.S. long-equity assets across 326 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are TSLA (13.39%), ACGL (4.84%), MSCI (4.39%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 36 new positions, exited 37, added to 87, and trimmed 173.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$33.13B
Long-equity book
326
Distinct positions
2026-03-31
Filed 2026-05-15
+36 / −37 / ↑87 / ↓173
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- FIGS INC$204.5M +30.0%
- SHOPIFY INC$191.3M +51.9%
- VERISK ANALYTICS INC$185.3M +63.6%
- EQUINIX INC$127.7M +114.6%
- CHOICE HOTELS INTL INC$92.3M +13.1%
Top Trims
- TESLA INC-$927.7M -17.3%
- COSTAR GROUP INC-$652.9M -49.8%
- IDEXX LABS INC-$298.7M -24.6%
- CLEARWATER ANALYTICS HLDGS I-$184.9M -98.1%
- MORNINGSTAR INC-$141.5M -52.4%
New Positions
- FORGENT POWER SOLUTIONS INC$136.8M
- PUBLIC STORAGE OPER CO$72.3M
- IRON MTN INC DEL$53.7M
- CAESARS ENTERTAINMENT INC NE$43.4M
- VISTA ENERGY S.A.B. DE C.V.$40.0M
Exited Positions
- EXACT SCIENCES CORP$96.9M
- LOUISIANA PAC CORP$54.5M
- GITLAB INC$53.5M
- MASIMO CORP$48.6M
- ARCELLX INC$39.8M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | TESLA INC | TSLA | 88160R101 | $4.44B | 13.39% | 11,933,509 | SH |
| 2 | ARCH CAP GROUP LTD | ACGL | G0450A105 | $1.60B | 4.84% | 16,709,759 | SH |
| 3 | MSCI INC | MSCI | 55354G100 | $1.45B | 4.39% | 2,699,389 | SH |
| 4 | GUIDEWIRE SOFTWARE INC | GWRE | 40171V100 | $986.7M | 2.98% | 6,597,453 | SH |
| 5 | GARTNER INC | IT | 366651107 | $937.0M | 2.83% | 5,917,616 | SH |
| 6 | IDEXX LABS INC | IDXX | 45168D104 | $917.8M | 2.77% | 1,633,367 | SH |
| 7 | HYATT HOTELS CORP | H | 448579102 | $911.9M | 2.75% | 6,341,673 | SH |
| 8 | FIGS INC | FIGS | 30260D103 | $885.6M | 2.67% | 59,959,449 | SH |
| 9 | FACTSET RESH SYS INC | FDS | 303075105 | $815.1M | 2.46% | 3,756,587 | SH |
| 10 | CHOICE HOTELS INTL INC | CHH | 169905106 | $796.0M | 2.40% | 7,690,494 | SH |
| 11 | RED ROCK RESORTS INC | RRR | 75700L108 | $715.7M | 2.16% | 13,412,846 | SH |
| 12 | SCHWAB CHARLES CORP | SCHW | 808513105 | $701.5M | 2.12% | 7,464,316 | SH |
| 13 | KINSALE CAP GROUP INC | KNSL | 49714P108 | $692.8M | 2.09% | 2,027,765 | SH |
| 14 | COSTAR GROUP INC | CSGP | 22160N109 | $658.1M | 1.99% | 16,314,175 | SH |
| 15 | VAIL RESORTS INC | MTN | 91879Q109 | $647.2M | 1.95% | 5,043,533 | SH |
| 16 | SPOTIFY TECHNOLOGY S A | SPOT | L8681T102 | $639.9M | 1.93% | 1,319,525 | SH |
| 17 | SHOPIFY INC | SHOP | 82509L107 | $559.7M | 1.69% | 4,718,230 | SH |
| 18 | NVIDIA CORPORATION | NVDA | 67066G104 | $509.2M | 1.54% | 2,919,758 | SH |
| 19 | VERISK ANALYTICS INC | VRSK | 92345Y106 | $476.6M | 1.44% | 2,511,976 | SH |
| 20 | BIRKENSTOCK HOLDING PLC | BIRK | M2029K104 | $335.6M | 1.01% | 9,366,068 | SH |
| 21 | ON HLDG AG | ONON | H5919C104 | $330.5M | 1.00% | 9,714,605 | SH |
| 22 | VERTIV HOLDINGS CO | VRT | 92537N108 | $296.0M | 0.89% | 1,181,144 | SH |
| 23 | SITEONE LANDSCAPE SUPPLY INC | SITE | 82982L103 | $274.1M | 0.83% | 2,059,076 | SH |
| 24 | INTERACTIVE BROKERS GROUP IN | IBKR | 45841N107 | $271.5M | 0.82% | 4,047,376 | SH |
| 25 | AMAZON COM INC | AMZN | 023135106 | $269.6M | 0.81% | 1,294,654 | SH |
| 26 | WELLTOWER INC | WELL | 95040Q104 | $265.9M | 0.80% | 1,344,941 | SH |
| 27 | EQUINIX INC | EQIX | 29444U700 | $239.2M | 0.72% | 243,975 | SH |
| 28 | PRIMERICA INC | PRI | 74164M108 | $215.4M | 0.65% | 860,026 | SH |
| 29 | TAIWAN SEMICONDUCTOR MANUFAC | TSM | 874039100 | $215.0M | 0.65% | 636,267 | SH |
| 30 | AMPHENOL CORP | APH | 032095101 | $209.7M | 0.63% | 1,659,690 | SH |
| 31 | GDS HLDGS LTD | GDS | 36165L108 | $185.2M | 0.56% | 4,597,246 | SH |
| 32 | AIRBNB INC | ABNB | 009066101 | $182.0M | 0.55% | 1,441,221 | SH |
| 33 | QUANTA SVCS INC | PWR | 74762E102 | $178.9M | 0.54% | 325,840 | SH |
| 34 | WYNN RESORTS LTD | WYNN | 983134107 | $176.4M | 0.53% | 1,736,856 | SH |
| 35 | METTLER TOLEDO INTERNATIONAL | MTD | 592688105 | $168.5M | 0.51% | 133,639 | SH |
| 36 | SAMSARA INC | IOT | 79589L106 | $162.2M | 0.49% | 5,119,835 | SH |
| 37 | BROADCOM INC | AVGO | 11135F101 | $161.9M | 0.49% | 523,219 | SH |
| 38 | HOULIHAN LOKEY INC | HLI | 441593100 | $152.4M | 0.46% | 1,061,403 | SH |
| 39 | META PLATFORMS INC | META | 30303M102 | $146.9M | 0.44% | 256,700 | SH |
| 40 | CBRE GROUP INC | CBRE | 12504L109 | $145.5M | 0.44% | 1,074,451 | SH |
| 41 | LIBERTY LIVE HOLDINGS INC | LLYVK | 530909308 | $143.6M | 0.43% | 1,525,473 | SH |
| 42 | PROLOGIS INC. | PLD | 74340W103 | $140.9M | 0.43% | 1,065,747 | SH |
| 43 | FORGENT POWER SOLUTIONS INC | FPS | 34631F102 | $136.8M | 0.41% | 4,674,583 | SH |
| 44 | LOAR HOLDINGS INC | LOAR | 53947R105 | $135.6M | 0.41% | 2,366,299 | SH |
| 45 | MORNINGSTAR INC | MORN | 617700109 | $128.4M | 0.39% | 759,515 | SH |
| 46 | TOLL BROTHERS INC | TOL | 889478103 | $127.2M | 0.38% | 932,031 | SH |
| 47 | BROOKFIELD CORP | BN | 11271J107 | $117.6M | 0.35% | 2,905,510 | SH |
| 48 | ALPHABET INC | GOOGL | 02079K305 | $110.0M | 0.33% | 382,577 | SH |
| 49 | NOVANTA INC | NOVT | 67000B104 | $108.1M | 0.33% | 915,083 | SH |
| 50 | KARMAN HLDGS INC | KRMN | 485924104 | $102.4M | 0.31% | 1,279,093 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $33.13B | 326 | 0001017918-26-000043 |
| 2025-12-31 | 2026-02-17 | $36.91B | 327 | 0001017918-26-000015 |
| 2025-09-30 | 2025-11-14 | $37.71B | 330 | 0001017918-25-000059 |