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Just days after announcing a $2 billion agreement with General Motors, Nikola Corp. is fighting back against a “short seller” accusing the startup of deception and lying about its electric technology.

Nikola Corp. shares fell as much as 13% after Hindenburg Research published a report accusing the startup electric-vehicle maker of “deception” and lying about its technology.

Tesla Inc. shares slid on Sept. 8 after the electric-vehicle maker missed out on being included in the S&P 500 Index, taking investors who had bet on its entry to the benchmark by surprise.

General Motors Co. and Nikola Corp. on Sept. 8 announced a strategic partnership under which GM will build Nikola’s Badger pickup truck and also serve as a key supplier of fuel cell-electric technology for Nikola’s Class 7 and Class 8 trucks.

Trevor Milton, the founder and chairman of Nikola Corp., is giving the first 50 employees of the electric-truck startup 6 million of his own shares after making a promise when he hired them.

Electric-vehicle startup Nikola Corp. is urging stragglers to exercise their right to buy shares, the deadline for which has been extended until 5 p.m. Aug. 25.

Nikola Corp. announced it received a minimum order for 2,500 heavy-duty electrified refuse trucks from Republic Services Inc. that could expand to 5,000 over the life of the agreement.

Just months after becoming a publicly traded company, Nikola Corp. reported that net losses widened versus year-ago levels as the company continues investing in the buildup toward the introduction of its electric trucks.

Nikola Corp. founder and Executive Chairman Trevor Milton believes the hydrogen fuel cell technology that powers his company’s trucks can place Nikola at the forefront of global efforts to toughen clean-air rules while also providing a truck that meets the needs of commercial fleets.

The battery-electric cabover Nikola Tre model will be the first Class 8 off the assembly line at Nikola's manufacturing facility in Coolidge, Ariz.