RB
Ron Baron
BAMCO INC /NY/ · Investor
1Y performance ⓘ
−6%
AUM (13F)
$33.1B
# of Holdings
325
3Y performance ⓘ
+9%
vs S&P 500 ⓘ
−70%
Updated
Mar 31
Ron Baron's BAMCO INC /NY/ holds 325 U.S.-equity positions worth $33.1B (SEC 13F, Q1 2026). Top positions: Tesla, Inc. 13.4%, Arch Capital Group Ltd 4.8%, MSCI, Inc. 4.4%. 13F-replication return is +9% over 3 years (-70 pts vs the S&P 500) — a replicated, non-audited figure.
Holdings
| Stock | % of portfolio | Shares | Value | Latest activity | Avg buy price | Current price | Date |
|---|---|---|---|---|---|---|---|
| TSLA Tesla, Inc. | 13.4% | 11.9M | $4.4B | — | $207.91 | $355.59 (+71%) | 2026-03-31 |
| ACGL Arch Capital Group Ltd | 4.8% | 16.7M | $1.6B | ▼ 7.1% (−1.3M) | $67.89 | $92.28 (+36%) | 2026-03-31 |
| MSCI MSCI, Inc. | 4.4% | 2.7M | $1.5B | ▼ 2.0% (−56K) | $560.42 | $541.65 (−3%) | 2026-03-31 |
| GWRE GUIDEWIRE SOFTWARE, INC. | 3.0% | 6.6M | $987M | ▲ 28% (+1.4M) | $97.26 | $147.84 (+52%) | 2026-03-31 |
| IT Gartner, Inc. | 2.8% | 5.9M | $937M | ▲ 40% (+1.7M) | $270.60 | $199.50 (−26%) | 2026-03-31 |
| IDXX Idexx Laboratories Inc | 2.8% | 1.6M | $918M | ▼ 9.2% (−165K) | $494.53 | $523.76 (+6%) | 2026-03-31 |
| H Hyatt Hotels Corporation | 2.8% | 6.3M | $912M | ▲ 3.9% (+235K) | $116.33 | $159.07 (+37%) | 2026-03-31 |
| FIGS FIGS, Inc. | 2.7% | 60.0M | $886M | — | $5.54 | $13.90 (+151%) | 2026-03-31 |
| FDS Factset Research Systems | 2.5% | 3.8M | $815M | ▲ 30% (+868K) | $333.97 | $274.83 (−18%) | 2026-03-31 |
| CHH Choice Hotels Intnl. | 2.4% | 7.7M | $796M | ▲ 4.1% (+304K) | $110.70 | $102.22 (−8%) | 2026-03-31 |
| RRR Red Rock Resorts, Inc. Class A Common Stock | 2.2% | 13.4M | $716M | ▲ 7.1% (+893K) | $46.28 | $49.40 (+7%) | 2026-03-31 |
| SCHW The Charles Schwab Corporation | 2.1% | 7.5M | $701M | ▲ 5.7% (+404K) | $55.39 | $97.72 (+76%) | 2026-03-31 |
| KNSL Kinsale Capital Group, Inc. | 2.1% | 2.0M | $693M | ▲ 14% (+247K) | $310.09 | $331.21 (+7%) | 2026-03-31 |
| CSGP CoStar Group Inc | 2.0% | 16.3M | $658M | ▼ 16% (−3.2M) | $69.60 | $27.93 (−60%) | 2026-03-31 |
| MTN Vail Resorts, Inc. | 1.9% | 5.0M | $647M | ▲ 4.9% (+234K) | $218.09 | $138.31 (−37%) | 2026-03-31 |
| SPOT Spotify Technology S.A. | 1.9% | 1.3M | $640M | ▲ 32% (+322K) | $300.58 | $491.19 (+63%) | 2026-03-31 |
| SHOP Shopify Inc. Class A subordinate voting shares | 1.7% | 4.7M | $560M | ▲ 106% (+2.4M) | $88.90 | $151.75 (+71%) | 2026-03-31 |
| NVDA NVIDIA CORP | 1.5% | 2.9M | $509M | ▼ 2.3% (−69K) | $36.35 | $230.82 (+535%) | 2026-03-31 |
| VRSK Verisk Analytics, Inc. Common Stock | 1.4% | 2.5M | $477M | ▲ 93% (+1.2M) | $193.17 | $170.10 (−12%) | 2026-03-31 |
| BIRK Birkenstock Holding plc | 1.0% | 9.4M | $336M | ▲ 18% (+1.4M) | $44.82 | $32.41 (−28%) | 2026-03-31 |
| ONON On Holding AG | 1.0% | 9.7M | $330M | ▲ 80% (+4.3M) | $34.79 | $29.67 (−15%) | 2026-03-31 |
| VRT Vertiv Holdings Co Class A Common Stock | 0.9% | 1.2M | $296M | ▼ 24% (−364K) | $18.54 | $241.53 (+1203%) | 2026-03-31 |
| SITE SiteOne Landscape Supply, Inc. | 0.8% | 2.1M | $274M | ▲ 1.5% (+31K) | $135.74 | $89.06 (−34%) | 2026-03-31 |
| IBKR Interactive Brokers Group, Inc. Class A Common Stock | 0.8% | 4.0M | $271M | ▼ 13% (−596K) | $31.38 | $85.14 (+171%) | 2026-03-31 |
| AMZN Amazon.Com Inc | 0.8% | 1.3M | $270M | ▲ 5.7% (+69K) | $129.35 | $249.66 (+93%) | 2026-03-31 |
| WELL Welltower Inc. | 0.8% | 1.3M | $266M | ▲ 5.3% (+67K) | $112.03 | $228.62 (+104%) | 2026-03-31 |
| EQIX Equinix, Inc. Common Stock REIT | 0.7% | 244K | $239M | ▲ 68% (+99K) | $869.12 | $1,007.08 (+16%) | 2026-03-31 |
| PRI PRIMERICA, INC. | 0.7% | 860K | $215M | ▼ 24% (−273K) | $172.24 | $274.01 (+59%) | 2026-03-31 |
| TSM Taiwan Semiconductor Manufac | 0.7% | 636K | $215M | — | $115.81 | $456.19 (+294%) | 2026-03-31 |
| APH Amphenol Corporation | 0.6% | 1.7M | $210M | ▼ 3.0% (−51K) | $21.01 | $84.32 (+301%) | 2026-03-31 |
| GDS Gds Hldgs Ltd | 0.6% | 4.6M | $185M | ▲ 21% (+812K) | $25.56 | $31.19 (+22%) | 2026-03-31 |
| ABNB Airbnb, Inc. Class A Common Stock | 0.6% | 1.4M | $182M | ▲ 64% (+561K) | $129.57 | $159.94 (+23%) | 2026-03-31 |
| PWR Quanta Services, Inc. | 0.5% | 326K | $179M | ▼ 0.7% (−2K) | $195.61 | $643.44 (+229%) | 2026-03-31 |
| WYNN Wynn Resorts Ltd | 0.5% | 1.7M | $176M | ▲ 42% (+517K) | $92.61 | $77.61 (−16%) | 2026-03-31 |
| MTD Mettler-Toledo International | 0.5% | 134K | $169M | ▼ 8.7% (−13K) | $1,530.21 | $1,507.36 (−1%) | 2026-03-31 |
| IOT Samsara Inc. | 0.5% | 5.1M | $162M | ▲ 24% (+1000K) | $37.24 | $38.67 (+4%) | 2026-03-31 |
| AVGO Broadcom Inc. Common Stock | 0.5% | 523K | $162M | ▼ 2.7% (−15K) | $169.10 | $352.10 (+108%) | 2026-03-31 |
| HLI Houlihan Lokey, Inc. | 0.5% | 1.1M | $152M | ▼ 5.6% (−63K) | $87.66 | $125.46 (+43%) | 2026-03-31 |
| META Meta Platforms, Inc. Class A Common Stock | 0.4% | 257K | $147M | ▼ 5.0% (−13K) | $261.91 | $732.25 (+180%) | 2026-03-31 |
| CBRE CBRE GROUP, INC. | 0.4% | 1.1M | $146M | ▼ 21% (−285K) | $85.80 | $129.57 (+51%) | 2026-03-31 |
| LLYVK Liberty Live Holdings, Inc. Series C Liberty Live Group Common Stock | 0.4% | 1.5M | $144M | ▼ 5.5% (−88K) | $83.16 | $97.16 (+17%) | 2026-03-31 |
| PLD PROLOGIS, INC. | 0.4% | 1.1M | $141M | ▼ 3.9% (−43K) | $119.44 | $128.30 (+7%) | 2026-03-31 |
| FPS Forgent Power Solutions, Inc. | 0.4% | 4.7M | $137M | NEW (+4.7M) | $29.27 | $36.34 (+24%) | 2026-03-31 |
| LOAR Loar Holdings Inc. | 0.4% | 2.4M | $136M | ▲ 12% (+247K) | $75.14 | $60.98 (−19%) | 2026-03-31 |
| MORN Morningstar, Inc. | 0.4% | 760K | $128M | ▼ 39% (−482K) | $207.10 | $192.83 (−7%) | 2026-03-31 |
| TOL Toll Brothers, Inc. | 0.4% | 932K | $127M | ▼ 20% (−234K) | $92.87 | $133.70 (+44%) | 2026-03-31 |
| BN Brookfield Corporation | 0.3% | 2.9M | $118M | ▼ 20% (−730K) | $31.77 | $36.41 (+15%) | 2026-03-31 |
| GOOGL Alphabet Inc. Class A Common Stock | 0.3% | 383K | $110M | ▲ 143% (+225K) | $242.44 | $344.90 (+42%) | 2026-03-31 |
| NOVT Novanta Inc. Common Stock | 0.3% | 915K | $108M | ▼ 2.3% (−22K) | $119.57 | $142.00 (+19%) | 2026-03-31 |
| KRMN Karman Holdings Inc. | 0.3% | 1.3M | $102M | ▼ 33% (−635K) | $33.52 | $32.46 (−3%) | 2026-03-31 |
Showing top 50 of 325 holdings by value.
FAQ ▾
What are Ron Baron's largest holdings?
As of the latest 13F: Tesla, Inc. 13.4%, Arch Capital Group Ltd 4.8%, MSCI, Inc. 4.4%, GUIDEWIRE SOFTWARE, INC. 3.0%, Gartner, Inc. 2.8%.
How big is BAMCO INC /NY/'s 13F portfolio?
$33.1B across 325 disclosed U.S.-equity positions.
What is Ron Baron's 3-year performance?
+9% (13F-replication, price return), -70 pts vs the S&P 500. Not an audited fund return.
Where does this data come from?
U.S. SEC Form 13F-HR institutional holdings filings.
Sourced from SEC Form 13F-HR filings · Not investment advice ▾
Data as of 2026-03-31 · Methodology
13F-replication (price return, filing-date based) — not an audited fund return.
Published by WealthFile · Not investment advice.
Latest activity = change vs. the prior 13F. Avg buy price = est. entry over the trailing 3 years (gain = vs. latest price). Returns are 13F-replication, not audited fund returns. Sourced from SEC 13F filings.