Rising Dragon Acquisition (RDAC) shares were 138% higher in premarket activity on Tuesday after the company announced a mutual termination of its merger agreement with HZJL Cayman.

Mercer International (MERC) shares were up 83% following the announcement of a recapitalization agreement that is expected to reduce the company's existing senior note debt.

Backblaze (BLZE) stock was up 33% following the company's Q3 financial results.

Harmonic (HLIT) stock was 17% higher after the company reported higher fiscal Q3 adjusted earnings and revenue.

COMPASS Pathways (CMPS) shares are up 9% after the company posted Q3 financial results.