HACK is trading 1.57% lower at $127.50 in after-hours trading after Fortinet’s lower full-year service-revenue forecast triggered selling across cybersecurity stocks. - Fortinet beat Q3 estimates but cut its 2026 service-revenue forecast to $5.15 billion–$5.17 billion from $5.18 billion–$5.22 billion; declines were also reported among cybersecurity peers and CIBR. - Nasdaq Composite fell 2.27%, while the S&P 500 fell 1.00%; HACK fell 1.31% in the October 29 regular session. No HACK-specific news or after-hours volume data was provided.