— Why it moved
Why BIYA Stock Spiked Then Crashed Today — July 20, 2026
A 1-for-10 reverse split left barely a million shares floating — perfect fuel for a premarket pump that gave almost all of it back by the close.
What moved BIYA stock
Baiya is a small China-based company that just pushed through a 1-for-10 reverse split, with split-adjusted trading starting Monday. There was no fresh business news. The whole move traces back to that split: it collapsed the share count, the stock popped 51% after-hours on the announcement, and the momentum spilled into the next session's premarket.
The mechanics
A reverse split done to defend a $1 listing price is a mechanics event, not a growth event. Here it left a float of barely over a million shares. A float that small has almost no supply to absorb buying, so a modest amount of volume sends the price flying — and the same thinness means nothing catches it when the buyers leave.
BIYA by the numbers
The alert window
Stock Pulse alerted at 7:42 AM premarket at $8.11. The high, $9.89, printed at 10:49 AM — 187 minutes later, about +22%. So there was roughly three hours of window, but it wasn't clean: the regular-session open gapped below the alert, so a 7:42 buyer sat underwater before the stock clawed back over $8.11 and pushed to the high.
How BIYA's move ended
From that $9.89 high it unwound all afternoon and closed at $3.51 — down about 57% from the alert, and red on the day versus the $4.14 prior close. No revenue story, a reverse split done for compliance, and a float too small to trust in either direction. The pop and the crash were the same mechanic running forward and then backward.
The tell: a fresh reverse split that shrinks the float to a rounding error cuts both ways — the thin float that rockets a premarket pump has no bids left to catch it on the way down.