BAMCO INC /NY/
Long book
$33.13B
Q1 2026
Positions
326
Top-10 weight
41%
concentration
Last quarter
+8.9%
SPY +14.8%
Turnover
20%
of book per quarter
Strategy in plain words
auto-generated from filingsBAMCO INC /NY/ is an institutional manager, running a $33.13B US long book across 326 positions.
The portfolio is moderately concentrated (top 10 ≈ 41% of the book). Turnover is modest: positions are typically held for years. Current anchor positions: TESLA INC, ARCH CAPITAL GROUP LTD, MSCI INC, GUIDEWIRE SOFTWARE INC, GARTNER INC.
Over the last 9 quarters its long book ran on average 3pp per quarter behind the S&P 500, beating the index in 2 of 9 quarters. Signal value of individual moves is limited — treat changes as weak evidence.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-3.5%
Q2 2024
+11.7%
Q3 2024
+4.9%
Q4 2024
-10.1%
Q1 2025
+10.4%
Q2 2025
+4.5%
Q3 2025
-1.5%
Q4 2025
-12.0%
Q1 2026
+8.9%
Sector allocation
Services media 26%
Technology 21%
Industrials 20%
Financials 14%
Other 6%
Healthcare 4%
Materials 3%
Consumer discretionary 3%
Long book by quarter
What does BAMCO INC own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| TSLA TESLA INC | Industrials | 11.9M | $4.44B | 13.4% | +0.1% |
| ACGL ARCH CAPITAL GROUP LTD | Financials | 16.7M | $1.60B | 4.8% | -7.1% |
| MSCI MSCI INC | Services media | 2.7M | $1.45B | 4.4% | -2.0% |
| GWRE GUIDEWIRE SOFTWARE INC | Technology | 6.6M | $986.7M | 3.0% | +28.2% |
| IT GARTNER INC | Services media | 5.9M | $937.0M | 2.8% | +40.5% |
| IDXX IDEXX LABORATORIES INC | Materials | 1.6M | $917.8M | 2.8% | -9.2% |
| H HYATT HOTELS CORP - CL A | Services media | 6.3M | $911.9M | 2.8% | +3.9% |
| FIGS FIGS INC-CLASS A | Other | 60.0M | $885.6M | 2.7% | Held |
| FDS FACTSET RESEARCH SYSTEMS INC | Technology | 3.8M | $815.1M | 2.5% | +30.0% |
| CHH CHOICE HOTELS INTL INC | Services media | 7.7M | $796.0M | 2.4% | +4.1% |
| RRR RED ROCK RESORTS INC-CLASS A | Services media | 13.4M | $715.7M | 2.2% | +7.1% |
| SCHW SCHWAB (CHARLES) CORP | Financials | 7.5M | $701.5M | 2.1% | +5.7% |
| KNSL KINSALE CAPITAL GROUP INC | Financials | 2.0M | $692.8M | 2.1% | +13.8% |
| CSGP COSTAR GROUP INC | Services media | 16.3M | $658.1M | 2.0% | -16.3% |
| MTN VAIL RESORTS INC | Services media | 5.0M | $647.2M | 2.0% | +4.9% |
| SPOT SPOTIFY TECHNOLOGY SA | Communications | 1.3M | $639.9M | 1.9% | +32.3% |
| SHOP SHOPIFY INC - CLASS A | Technology | 4.7M | $559.7M | 1.7% | +106.2% |
| NVDA NVIDIA CORP | Technology | 2.9M | $509.2M | 1.5% | -2.3% |
| VRSK VERISK ANALYTICS INC | Technology | 2.5M | $476.6M | 1.4% | +92.8% |
| BIRK BIRKENSTOCK HOLDING PLC | Other | 9.4M | $335.6M | 1.0% | +17.6% |
| ONON ON HOLDING AG-CLASS A | Other | 9.7M | $330.5M | 1.0% | +79.7% |
| VRT VERTIV HOLDINGS CO-A | Technology | 1.2M | $296.0M | 0.9% | -23.6% |
| SITE SITEONE LANDSCAPE SUPPLY INC | Consumer discretionary | 2.1M | $274.1M | 0.8% | +1.5% |
| IBKR INTERACTIVE BROKERS GRO-CL A | Financials | 4.0M | $271.5M | 0.8% | -12.8% |
| AMZN AMAZON.COM INC | Consumer discretionary | 1.3M | $269.6M | 0.8% | +5.7% |
| PRI PRIMERICA INC | Financials | 860.0K | $215.4M | 0.7% | -24.1% |
| APH AMPHENOL CORP-CL A | Technology | 1.7M | $209.7M | 0.6% | -3.0% |
| ABNB AIRBNB INC-CLASS A | Services media | 1.4M | $182.0M | 0.5% | +63.8% |
| PWR QUANTA SERVICES INC | Industrials | 325.8K | $178.9M | 0.5% | -0.7% |
| WYNN WYNN RESORTS LTD | Services media | 1.7M | $176.4M | 0.5% | +42.4% |
| MTD METTLER-TOLEDO INTERNATIONAL | Healthcare | 133.6K | $168.5M | 0.5% | -8.7% |
| IOT SAMSARA INC-CL A | Technology | 5.1M | $162.2M | 0.5% | +24.3% |
| AVGO BROADCOM INC | Technology | 523.2K | $161.9M | 0.5% | -2.7% |
| HLI HOULIHAN LOKEY INC | Financials | 1.1M | $152.4M | 0.5% | -5.6% |
| META META PLATFORMS INC-CLASS A | Technology | 256.7K | $146.9M | 0.4% | -5.0% |
| CBRE CBRE GROUP INC - A | Real estate | 1.1M | $145.5M | 0.4% | -21.0% |
| LLYVK LIBERTY LIVE HOLDINGS-C | Services media | 1.5M | $143.6M | 0.4% | -5.5% |
| FPS FORGENT POWER SOLUTIONS-CL A | Industrials | 4.7M | $136.8M | 0.4% | New |
| LOAR LOAR HOLDINGS INC | Industrials | 2.4M | $135.6M | 0.4% | +11.6% |
| MORN MORNINGSTAR INC | Financials | 759.5K | $128.4M | 0.4% | -38.8% |
| TOL TOLL BROTHERS INC | Industrials | 932.0K | $127.2M | 0.4% | -20.1% |
| BN BROOKFIELD CORP | Real estate | 2.9M | $117.6M | 0.4% | -20.1% |
| GOOGL ALPHABET INC-CL A | Technology | 382.6K | $110.0M | 0.3% | +142.9% |
| NOVT NOVANTA INC | Technology | 915.1K | $108.1M | 0.3% | -2.3% |
| KRMN KARMAN HOLDINGS INC | Industrials | 1.3M | $102.4M | 0.3% | -33.2% |
| RBC RBC BEARINGS INC | Industrials | 181.5K | $98.6M | 0.3% | -40.1% |
| NPO ENPRO INC | Other | 391.7K | $98.2M | 0.3% | +31.1% |
| NET CLOUDFLARE INC - CLASS A | Technology | 457.3K | $94.4M | 0.3% | +11.7% |
| HTFL HEARTFLOW INC | Healthcare | 3.8M | $93.1M | 0.3% | +66.1% |
| DKNG DRAFTKINGS INC-CL A | Services media | 4.2M | $91.2M | 0.3% | -9.7% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 326 | $33.13B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 327 | $36.91B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 14, 2025 | 330 | $37.71B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 306 | $36.89B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 15, 2025 | 314 | $34.05B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 14, 2025 | 316 | $38.69B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 328 | $37.70B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 329 | $34.92B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 15, 2024 | 332 | $37.52B | canonical | SEC ↗ |
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