Top Premarket Gainers

07:10 AM EDT, 10/23/2026 (MT Newswires) -- Lucid Diagnostics (LUCD) stock was 34% higher pre-bell Friday after the company said it has begun receiving Medicare reimbursement payments for its EsoGuard esophageal DNA test and has simultaneously secured $15 million in private placement financing. WISeSat.Space (SAIQ) shares were up more than 29% after a 5% retreat in the prior session. STAK (STAK) stock was 16% higher, extending the 67% gain in the previous session. RingCentral's (RNG) shares were up 15% after the company reported higher Q3 financial results, and lifted its fiscal 2026 guidance.