KOSS is trading at $3.76, up 8.36% after hours, with no company-specific announcement identified for October 21.

  • KOSS closed the regular session at $3.47.
  • Schwab reported no headlines for October 21. The latest filing found was an October 16 report about the October 14 shareholder meeting, not a clear catalyst for the move.
  • The Nasdaq rose 1.07% and the S&P 500 gained 0.55%; this risk-on backdrop may be relevant, but a direct link to KOSS’s after-hours jump is unconfirmed.