This market will resolve Yes if BRKB outperforms SPX in June 2026. This is a comparison of price returns only, not total return, but adjustment would be made to allow for splits.

The primary resolution source will be finance.yahoo.com, using Close prices from the last trading day of May to the last trading day of June. Other sources may also be considered, for example if the primary source is unavailable or has a manifest error in the relevant figures.

I may bet on this market.