nikola corp shares fell tuesday to the lowest since december 2018 accelerating a selloff that has now erased all their gains since the electricvehicle startup went public via blankcheck company last year the electrictruck maker  once briefly more valuable than ford motor co  closed down 62 at 965 in new york bringing it below the 10 level at which vectoiq acquisition corp the specialpurpose acquisition company that acquired nikola debuted in june 2018