RKLB stock dropped about 8% in trading on Aug. 11 after Rocket Lab posted an adjusted loss of $0.08 per share. Why Is RKLB Stock Falling Today? The sell-off comes after an already volatile summer for Rocket Lab shares. Rocket Lab Backlog Hits Record $2.36 BillionThe earnings report was not entirely bearish. Tuesday’s RKLB stock decline shows that, for now, the market is placing more weight on execution risk than on headline growth.