Tectonic Therapeutic (TECX) shares were 42% lower pre-bell Tuesday following a 1.9% gain at Monday's close.
Upwork (UPWK) stock was down almost 24% after the company issued Q1 guidance that trailed analysts' projections.
Amentum (AMTM) shares were 9.6% lower, a day after the company reported lower fiscal Q1 revenue.