Shares of Rivian Automotive (RIVN -8.58%) were trading lower on Thursday, a day after The Wall Street Journal reported that rival electric vehicle (EV) maker Fisker (FSR -54.95%) may be preparing to file for bankruptcy.As of 2 p.m. ET, shares of Rivian were down about 8.3% from Wednesday's closing price. Key rival Fisker is in dire straitsThe Journal reported on Wednesday afternoon that Fisker has "hired restructuring advisors to assist with a possible bankruptcy filing," news that sent the struggling elect ...