Berkshire Hathaway class B shares closed at $532.02 on Friday 16 October 2026, above the $509.77 close of 18 September 2026, per Nasdaq's BRK/B historical price data (the Nasdaq page itself timed out in the browser, so the figures were read from Nasdaq's own data feed for that page).
Hunch. Berkshire shares moved only 0.1% on the day of the announcement and come into this window nine points behind the S&P 500 for the year, so the pattern is being tested on a share with weak momentum behind it.
This market resolves on the official closing price of Berkshire Hathaway class B shares (BRK.B) on the New York Stock Exchange for Friday 16 October 2026, read on the Nasdaq price page for BRK/B after the close, against the reference close of $509.77 on 18 September 2026: YES if below 509.77, NO if equal or above. If that page is unavailable, two of the NYSE quote page, Reuters and the BBC market data settle it; if 16 October is not a trading day, the next trading day's close is used.
We looked for S&P 100 companies where a founder, or someone who had chaired the board for ten years or more, gave up the chair while another person was already chief executive. We found thirteen cases since 2010 and show them all. For each, we checked whether the shares closed below the announcement-day price four weeks later. In eleven of the thirteen the shares dipped below that price within five days, so the first days say little. At Microsoft and Oracle, both in 2014, a new chief executive was named on the same day, so those price moves were not about the chair alone.