07:29 AM EDT, 05/20/2025 (MT Newswires) -- Protagenic Therapeutics ( PTIX ) shares fell 17% pre-bell Tuesday, shaving Monday's rally.

Lion Group Holding ( LGHL ) shares retreated 10%, erasing gains from the previous session.

Yalla Group ( YALA ) shares dropped 8%, a day after the company issued Q2 revenue guidance that trailed projection from a single analyst polled by FactSet.

Vipshop ( VIPS ) stock was down nearly 9% after the company reported lower Q1 adjusted earnings and revenue.