After-hours Movers: Fortinet, DoorDash, Arm Lead Gains

Fortinet jumps 17% after EPS beat $0.82 and raising full‑year revenue guidance to $7.87 bn, exceeding expectations.
DoorDash climbs 11% on Q1 EPS beat $0.42, despite slightly lower revenue, and projects Q2 EBITDA up to $870 m.
Arm Holdings rises 10% after Q4 earnings and revenue beat, with AI‑related demand driving a strong outlook.
Fastly falls 24% and Alpha & Omega drops 20% after earnings misses and weaker guidance, sparking sharp sell‑offs.