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Premarket Gainers: OncoSec Medical, Castellum, Conformis, Nuvve, Surgalign
ONCS:
OncoSec Medical stock is rocketing more than 127% following a delisting notice and heavy trading.
CTM:
Castellum shares are soaring over 109% with heavy trading on Friday morning.
CFMS:
Conformis stock is surging more than 89% after announcing it’s being acquired.
NVVE:
Nuvve shares are increasing over 49% after introducing its Astrea AI product for ancillary services.
SRGA:
Surgalign stock is rising more than 44% as volatility continues throughout its bankruptcy.

Premarket Losers: Spark Networks, Virgin Galactic, Biodexa Pharmaceuticals, Better Choice, ShiftPixy
LOV:
Spark Networks stock is plummeting more than 38% alongside financing troubles and a failed delisting appeal.
SPCE:
Virgin Galactic shares are diving over 17% after announcing a share sale agreement.
BRDX:
Biodexa Pharmaceuticals stock is tumbling more than 16% alongside an ADR ratio change.
BTTR:
Better Choice shares are taking an over 15% beating after rallying on a strategic investment yesterday.
PIXY:
ShiftPixy stock is dropping more than 14% after an unexpected rally yesterday.

Knowing stock market today at a glance

Dec.18 2025

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