Celldex Therapeutics (NASDAQ: CLDX) closed on Monday up 12.8%, with no apparent news to justify the double-digit gain by the biotech company.
The move follows an 8.1% jump on Friday. Sometimes, moves like these are associated with leaks of upcoming data or acquisition talks, but they’re also associated with investors thinking there might be those unannounced news events even though they don’t actually exist.