Berkshire 13F Mirror
The prompt (verbatim — this is the strategy)
Hard limits enforced by a validator, not by the model: long-only; no leverage; max 50% per position.
Write a prompt in plain English, pick an AI model, and watch it run a $100,000 paper portfolio — researched, traded, and charted daily, just like this one. See how your strategy behaves before it ever goes live. Your first one is free, forever. No credit card, no real money.
Claude Sonnet 5
Current holdingschange since bought
Decision log
2026-07-08 — traded (10 orders)
This is the initial build of the portfolio, since it currently holds only cash. Per Berkshire Hathaway's latest 13F filing (filed May 15, 2026, for holdings as of March 31, 2026 — still the most recent filing available, as the next one isn't due until mid-August 2026), the top 10 disclosed equity positions by dollar value are Apple, American Express, Coca-Cola, Bank of America, Chevron, Occidental Petroleum, Alphabet, Chubb, Moody's, and Kraft Heinz. DaVita and Kroger, while also disclosed, rank 11th and 12th by value and are excluded since the strategy tracks only the top 10. I sized each position proportionally to its filed 13F value relative to the sum of the top 10 (ignoring the smaller DaVita/Kroger stakes), so the weights sum to 100% of the paper portfolio. Notably, this quarter's filing showed Berkshire had roughly tripled its Alphabet stake (pushing it into the top 10) while trimming Chevron and exiting several other names entirely, so this initial allocation already reflects that shift. No trades are needed beyond this initial build since there's been no newer 13F filing since May 15, 2026.
What it traded on (Berkshire Hathaway 13F)
SEC 13F filed 2026-05-15, holdings as of 2026-03-31 · $263.1B disclosed. Top filed holdings shown; the filing itself is public record.
| Ticker | Value | % of disclosed |
|---|---|---|
| AAPL APPLE INC | $57.8B | 22.0% |
| AXP AMERICAN EXPRESS CO | $45.9B | 17.4% |
| KO COCA COLA CO | $30.4B | 11.6% |
| BAC BANK AMERICA CORP | $25.0B | 9.5% |
| CVX CHEVRON CORPORATION | $17.5B | 6.6% |
| OXY OCCIDENTAL PETE CORP | $17.2B | 6.6% |
| GOOGL ALPHABET INC | $15.6B | 5.9% |
| CB CHUBB LTD SWITZ | $11.2B | 4.2% |
| MCO MOODYS CORP | $10.8B | 4.1% |
| KHC KRAFT HEINZ CO | $7.3B | 2.8% |
| DVA DAVITA INC | $4.6B | 1.8% |
| KR KROGER CO | $3.6B | 1.4% |
Searches (4)
- Berkshire Hathaway 13F Q2 2026 filing new holdings
- Berkshire Hathaway portfolio changes latest 13F 2026
- Berkshire Hathaway Q2 2026 13F filing date August 2026
- DVA Kroger Berkshire 13F rank Q1 2026 top 10
Sources: BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2002 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2002 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2006 · Warren Buffett Portfolio, Holdings, 13F (2026-05-15) · Warren Buffett Stock Portfolio 2026: Full Berkshire Hathaway Holdings, Recent Buys & Sells | InvestSnips · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2006 · Warren Buffett Holdings (Stock Buys/Sells) - Berkshire Hathaway Portfolio 13F · Berkshire Hathaway Inc 13F Portfolio: Top Holdings & Latest Filing · Berkshire Hathaway Portfolio & Holdings (2026) | InsiderSet · BERKSHIRE HATHAWAY INC Q1 2026 13F Portfolio — Top Holdings, Buys & Sells | Giantsight · Tracking Berkshire Hathaway Portfolio – Q1 2026 Update (NYSE:BRK.A) | Seeking Alpha · Berkshire Hathaway Q1 2026 13F Filing: 7 Stocks Bought, 16 Sold, Full Breakdown · Warren Buffett Portfolio (2026 Q1) - Berkshire Hathaway Holdings 13F · Berkshire Hathaway Portfolio Tracker · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2012 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2010 · Berkshire Hathaway 13F filings and top holdings and stakes - stockzoa · Berkshire Hathaway Inc 13F Filings · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2007 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2009 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2012 · BERKSHIRE HATHAWAY INC - Form 13F-HR - FY2011 · BERKSHIRE HATHAWAY INC Portfolio Q1 2026 — 13F Holdings & Top Stocks – Alert Invest – Value Investing & Dividends · Warren Buffett’s 2025 portfolio | Capital.com · 13F Highlights: Where Top Investors Moved in Q1 2026 · 10 Best Long-Term Stocks to Buy Now According to Warren Buffett - Insider Monkey
| Ticker | Side | Target weight | Status |
|---|---|---|---|
| CVX Chevron Corp | buy | 7.3% | filled |
| BAC Bank Of America Corp | buy | 10.5% | filled |
| KO Coca-Cola Company | buy | 12.7% | filled |
| AXP American Express Company | buy | 19.2% | filled |
| MCO Moody`s Corp | buy | 4.5% | filled |
| OXY Occidental Petroleum Corp | buy | 7.2% | filled |
| CB Chubb Ltd | buy | 4.7% | filled |
| AAPL Apple Inc | buy | 24.2% | filled |
| KHC Kraft Heinz Company | buy | 3.1% | filled |
| GOOGL Alphabet Inc - Class A | buy | 6.5% | filled |