Berkshire 13F Mirror
13f mirrorquarterlyactivesince 2026-07-08universe: Berkshire Hathaway 13F top holdings
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.
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.
| Ticker | Side | Target weight | Status |
|---|---|---|---|
| AAPL Apple Inc | buy | 24.2% | filled |
| AXP American Express Company | buy | 19.2% | filled |
| KO Coca-Cola Company | buy | 12.7% | filled |
| BAC Bank Of America Corp | buy | 10.5% | filled |
| CVX Chevron Corp | buy | 7.3% | filled |
| OXY Occidental Petroleum Corp | buy | 7.2% | filled |
| GOOGL Alphabet Inc - Class A | buy | 6.5% | filled |
| CB Chubb Ltd | buy | 4.7% | filled |
| MCO Moody`s Corp | buy | 4.5% | filled |
| KHC Kraft Heinz Company | buy | 3.1% | filled |