Berkshire Mirror

Published Jul 20, 2026Live

Performance since launch

Total return
Max drawdown
Frequency
Risk level
Low

Backtest volatility

About this strategy

Holds what Berkshire Hathaway last disclosed owning in its 13F, weighted by position size and capped so no single name dominates.

How it works

  1. Agent triggers

    The run starts every week on Monday at 10:00 AM, following the disclosure of Berkshire Hathaway's latest 13F filing. This is done after it becomes public.

  2. Computes its signals

    It reads the disclosed holdings and aggregates positions by CUSIP, filtering out only those securities. It then weights each position according to the size indicated in the 13F.

  3. Sets the target portfolio

    The resulting portfolio consists of a set of weighted positions, ensuring no single name exceeds its caps. The mix is refreshed based on the updated disclosures.

  4. Executes orders

    Your account trades toward the target, selling before buys, inside the platform's risk rails: stop-loss and daily loss limits you control.

Ask this agent

. Preview chat needs an account.

Answers describe the strategy’s rules, not investment advice.

Backtests

* Backtest figures are simulated based on historical market data. Past performance is not indicative of future results.