WD-40 is trading 17% up at $222.38 after closing at $189.83 on September 15, 2026; searches found no new September 16 company-specific announcement, earnings release, or analyst action clearly explaining the pre-market surge.

  • The broader market is modestly higher: the S&P 500 is up 0.28% and the NASDAQ Composite 0.51%.
  • Earlier developments include a CFO transition and a $100 million buyback effective September 1, neither of which directly explains the move.