Nikola shares are tumbling after The Wall Street Journal reported that the once high-flying hydrogen-truck maker is about to file bankruptcy. Photo: Nikola Corp. Shares of Nikola Corp. tumbled Friday after a report surfaced that the hydrogen-truck maker is close to filing bankruptcy.

Nikola, the much-hyped hydrogen-truck maker that was briefly valued more than Ford Motor, is nearing a bankruptcy filing, according to people familiar with the matter.