13F GuideFiling Basics
What is SEC Form 13F? Ultimate Guide to Institutional Equity Filings
Learn how SEC Form 13F filings work, the $100M threshold, 45-day reporting lag, and how to track top hedge fund holdings.
AlphaSMO Research GuideRead Guide
CIK: 0001513211
Total reported value
$2.1B
$2.1B
129 檔
21.2%
In Q3 2025, Main Street Research LLC's U.S. equity holdings reached a combined market value of $2.1B, distributed across 129 disclosed stock positions.
In Q3 2025, Main Street Research LLC displayed an active expansion posture, initiating 42 new positions and adding to 39 existing holdings, outstripping position reductions.
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | NVDA | Nvidia CORP | Stock-Tech | 6.06% | -0.35% | +1.07% | |
| 2 | AAPL | Apple Inc | Stock-Tech | 4.83% | -0.41% | +19.34% | |
| 3 | MSFT | Microsoft CORP | Stock-Tech | 4.71% | -0.23% | +77.57% | |
| 4 | PLTR | Palantir Technologies Inc-a | Stock-Tech | 4.49% | -1.37% | -1.29% | |
| 5 | HOOD | Robinhood Markets Inc - A | Stock-Financials | 4.17% | — | +0.48% | |
| 6 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 3.94% | +0.13% | +0.84% | |
| 7 | JPM | Jpmorgan Chase & Co | Stock-Financials | 3.83% | -0.33% | +0.19% | |
| 8 | AVGO | Broadcom Inc | Stock-Tech | 3.72% | -0.02% | +12.89% | |
| 9 | META | Meta Platforms Inc-class A | Stock-Comm Services | 3.54% | -0.44% | +40.12% | |
| 10 | TSM | Taiwan Semiconductor-sp Adr | Stock-Tech | 3.33% | +0.76% | +61.25% | |
| 11 | ISCF | Ishares International Small | ETF-Other | 3.32% | -0.62% | — | |
| 12 | V | Visa Inc-class A Shares | Stock-Financials | 3.27% | -0.03% | +2.71% | |
| 13 | COST | Costco Wholesale CORP | Stock-Consumer Staples | 3.17% | -0.58% | +0.97% | |
| 14 | AMZN | Amazon.com Inc | Stock-Consumer Disc | 3.12% | -0.17% | +17.30% | |
| 15 | MCK | Mckesson CORP | Stock-Healthcare | 2.88% | -2.39% | -0.41% | |
| 16 | NFLX | Netflix Inc | Stock-Comm Services | 2.78% | -0.02% | EXIT | |
| 17 | UBER | Uber Technologies Inc | Stock-Industrials | 2.40% | -0.01% | +0.78% | |
| 18 | TMUS | T-mobile US Inc | Stock-Comm Services | 2.33% | -0.01% | EXIT | |
| 19 | ASML | ASML Holding N.V. | Stock-Tech | 2.11% | +0.78% | +131.09% | |
| 20 | MELI | Mercadolibre Inc | Stock-Consumer Disc | 2.00% | — | +0.67% | |
| 21 | APH | Amphenol Corp-cl A | Stock-Tech | 1.99% | +0.36% | — | |
| 22 | GLDM | Spdr Gold Minishares Trust | ETF-Commodities | 1.93% | -2.53% | EXIT | |
| 23 | SPOT | Spotify Technology S.A. | Stock-Comm Services | 1.90% | — | +1.21% | |
| 24 | WMT | Walmart Inc | Stock-Consumer Staples | 1.90% | -0.63% | +1.53% | |
| 25 | BCS | Barclays Plc-spons Adr | Stock-Financials | 1.89% | +1.01% | — | |
| 26 | LIN | Linde plc | Stock-Materials | 1.88% | — | +1.23% | |
| 27 | BKNG | Booking Holdings Inc | Stock-Consumer Disc | 1.80% | — | +31.94% | |
| 28 | TT | Trane Technologies plc | Stock-Industrials | 1.79% | — | +2.96% | |
| 29 | IBN | Icici Bank Ltd-spon Adr | Stock-Financials | 1.72% | — | +1.14% | |
| 30 | CCJ | Cameco CORP | Stock-Energy | 1.65% | -0.58% | — | |
| 31 | GEV | GE Vernova Inc | Stock-Industrials | 1.62% | +0.25% | +76.21% | |
| 32 | APO | Apollo Global Management Inc | Stock-Financials | 1.56% | — | — | |
| 33 | PG | Procter & Gamble Co/the | Stock-Consumer Staples | 1.27% | -0.22% | -62.46% | |
| 34 | FICO | Fair Isaac CORP | Stock-Tech | 0.70% | +0.01% | -19.55% | |
| 35 | IBIT | Ishares Bitcoin Trust ETF | ETF-Crypto | 0.67% | -0.44% | EXIT | |
| 36 | PANW | Palo Alto Networks Inc | Stock-Tech | 0.38% | +0.06% | +162.07% | |
| 37 | BRK-B | Berkshire Hathaway Inc-cl B | Stock-Other | 0.36% | -0.05% | -88.59% | |
| 38 | TSLA | Tesla Inc | Stock-Consumer Disc | 0.31% | -0.01% | +10.34% | |
| 39 | MCD | Mcdonald's CORP | Stock-Consumer Disc | 0.31% | -0.17% | -0.03% | |
| 40 | ANET | Arista Networks Inc | Stock-Tech | 0.27% | +0.03% | — | |
| 41 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 0.26% | -0.01% | -2.28% | |
| 42 | ADSK | Autodesk Inc | Stock-Tech | 0.24% | -0.07% | -3.96% | |
| 43 | BRK-A | Berkshire Hathaway Inc-cl A | Stock-Other | 0.20% | -0.03% | — | |
| 44 | SCHW | Schwab (charles) CORP | Stock-Financials | 0.18% | -0.05% | +1.43% | |
| 45 | WFC | Wells Fargo & Co | Stock-Financials | 0.17% | -0.03% | +101.75% | |
| 46 | URTH | Ishares Msci World ETF | ETF-Other | 0.16% | -0.02% | -10.53% | |
| 47 | IXUS | Ishares Core Intl Stock ETF | ETF-Other | 0.15% | -0.01% | +30.23% | |
| 48 | XOM | Exxon Mobil CORP | Stock-Energy | 0.15% | -0.10% | +10.19% | |
| 49 | CVX | Chevron CORP | Stock-Energy | 0.14% | -0.07% | +76.22% | |
| 50 | ABBV | Abbvie Inc | Stock-Healthcare | 0.12% | -0.01% | +4.56% |
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | NVDA | Nvidia CORP | +2.9% | +1.07% | Add |
| 2 | ASML | ASML Holding N.V. | +2.1% | +131.09% | Add |
| 3 | WMT | Walmart Inc | +1.8% | +1.53% | Add |
| 4 | MSFT | Microsoft CORP | +1.4% | +77.57% | Add |
| 5 | TSM | Taiwan Semiconductor-sp Adr | +1.4% | +61.25% | Add |
| 6 | GOOGL | Alphabet Inc-cl A | +1% | +0.84% | Add |
| 7 | AVGO | Broadcom Inc | +0.8% | +12.89% | Trim |
| 8 | GEV | GE Vernova Inc | +0.7% | +76.21% | Add |
| 9 | FICO | Fair Isaac CORP | +0.4% | -19.55% | Add |
| 10 | JPM | Jpmorgan Chase & Co | +0.3% | +0.19% | Add |
| 11 | NFLX | Netflix Inc | +0.2% | +0.78% | Add |
| 12 | PANW | Palo Alto Networks Inc | +0.2% | +162.07% | Add |
| 13 | WFC | Wells Fargo & Co | +0.1% | +101.75% | Add |
| 14 | MELI | Mercadolibre Inc | +0.1% | +0.67% | Add |
| 15 | TSLA | Tesla Inc | +0.1% | +10.34% | Trim |
| 16 | GOOG | Alphabet Inc-cl C | 0% | -2.28% | Trim |
| 17 | QQQ | Invesco Qqq Trust Series 1 | 0% | +53.51% | Add |
| 18 | SPY | Ss Spdr S&p 500 ETF Trust-us | 0% | -0.64% | Add |
| 19 | SCHI | Schwab 5-10 Year Corporate B | 0% | +31.65% | Add |
| 20 | IGLB | Ishares 10+ Year Inv Gr CORP | 0% | +49.83% | Add |
| 21 | CVX | Chevron CORP | 0% | +76.22% | Add |
| 22 | RTX | Rtx CORP | 0% | +24.04% | Add |
| 23 | VOO | Vanguard S&p 500 ETF | 0% | +78.85% | Add |
| 24 | ISTB | Ishares Core 1-5 Year Usd Bo | 0% | +11.93% | Add |
| 25 | CW | Curtiss-wright CORP | 0% | — | Unchanged |
| 26 | HIMS | Hims & Hers Health Inc | 0% | — | Trim |
| 27 | SCHW | Schwab (charles) CORP | — | +1.43% | Trim |
| 28 | IVV | Ishares Core S&p 500 ETF | — | +20.63% | Add |
| 29 | NTES | Netease Inc-adr | — | +2.13% | Add |
| 30 | ADBE | Adobe Inc | — | +61.58% | Add |
| 31 | XYL | Xylem Inc | — | +1.94% | Add |
| 32 | C | Citigroup Inc | — | +5.98% | Trim |
| 33 | IWF | Ishares Russell 1000 Growth | — | — | Unchanged |
| 34 | MA | Mastercard Inc - A | — | +24.53% | Trim |
| 35 | CMCSA | Comcast Corp-class A | — | +8.20% | Add |
| 36 | DIA | Ss Spdr Dow Jones Indus Avg | — | — | Unchanged |
| 37 | NSC | Norfolk Southern CORP | — | — | Trim |
| 38 | PEP | Pepsico Inc | — | -10.11% | Add |
| 39 | IBM | Intl Business Machines CORP | — | -5.96% | Trim |
| 40 | ABT | Abbott Laboratories | — | +1.93% | Add |
| 41 | TXN | Texas Instruments Inc | — | +2.29% | Trim |
| 42 | ADSK | Autodesk Inc | 0% | -3.96% | Trim |
| 43 | ABBV | Abbvie Inc | 0% | +4.56% | Add |
| 44 | TRMB | Trimble Inc | 0% | +1.65% | Trim |
| 45 | TMO | Thermo Fisher Scientific Inc | 0% | +8.50% | Trim |
| 46 | ADP | Automatic Data Processing | 0% | — | Trim |
| 47 | KO | Coca-cola Co/the | 0% | — | Trim |
| 48 | CL | Colgate-palmolive Co | 0% | — | Unchanged |
| 49 | SYK | Stryker CORP | 0% | -2.72% | Trim |
| 50 | MMM | 3m Co | 0% | +0.45% | Trim |
According to official SEC Form 13F filings, Main Street Research LLC reported a total U.S. public equity portfolio value of $2.1B across 129 disclosed positions in Q3 2025.
Expert Analysis & Guides for Tracking Wall Street Smart Money Movements
Learn how SEC Form 13F filings work, the $100M threshold, 45-day reporting lag, and how to track top hedge fund holdings.
In terms of portfolio concentration, the top 5 core holdings (including NVDA, AAPL, MSFT) accounted for 21.2% of total reported equity market value during Q3 2025.
Top New Position Initiated
HOOD
市值: $77.2M
Top Position Liquidated / Trimmed
ISRG
前期市值: $39.7M
During Q3 2025, Main Street Research LLC's top holdings by market value included NVDA (6.1%)、AAPL (4.8%)、MSFT (4.7%). The largest single position, NVDA, represented 6.1% of total portfolio value.
In Q3 2025, Main Street Research LLC made 138 total portfolio adjustments, initiating 42 new buys, adding to 39 positions, trimming 43 holdings, and fully liquidating 14 stocks.
All holding records on this page are fetched directly from the U.S. Securities and Exchange Commission (SEC) EDGAR system (Form 13F-HR). AlphaSMO parses CUSIP identifiers and formats data into Schema.org-compliant datasets.
Understand SEC Form 4 insider disclosures for corporate officers, directors, and 10% owners to track executive transactions.
Understand Rule 144 restricted stock sale notices to spot planned insider liquidations before market sell pressure arrives.
Explore the 5% beneficial ownership threshold, 13D vs 13G filing differences, and recent SEC accelerated deadline rules.
Best practices for analyzing 13F quarterly changes without getting misled by stock splits, options, or market valuation drift.
Learn how AlphaSMO's flagship signal detects high-conviction stocks where 13F hedge funds and corporate insiders buy at the same time.