Scott Taetsch | USA TODAY Sports
President Donald Trump speaks during the ceremony to present the Commander in Chief's Trophy during a White House event with the Army Black Knights in the Rose Garden.
A tweet by President Donald Trump sent shares of penny stock Workhorse soaring Wednesday.
Shares of the Ohio-based automaker, which makes electric vehicles, jumped more than 56 percent. The stock was last trading at around $1.33 after opening at 82 cents on Wednesday. It has a market value of just $90 million.
In a tweet Wednesday, president said that General Motors CEO Mary Barra informed him that GM would sell its shuttered Lordstown, Ohio, manufacturing plant to Workhorse to build electric trucks. GM later clarified that it is still in talks about a potential sale.
Analysts at Cowen said that the Trump tweet was behind the surge. The tweet crashed the company's website, which was still inaccessible about three hours after the Trump mention.
Cowen also said Trump's comments raised speculation that "Workhorse is likely to be a vendor for the US Postal Service program."
"Based on media reports and comments from the US Postal Service, testing for the next generation vehicle is done and a request for production is due later this year," Cowen analyst Jeffrey Osborne said in a note to clients Wednesday.
Workhorse told CNBC it was one of the finalists being considered for the postal service contract but would not comment further.
Workhorse W-15 Electric Pickup Truck.
"We are pleased with this development, but note the tweet from Trump is incredibly vague as it relates to financial ramifications for Workhorse," Osborne said.
GM's Lordstown assembly plant shut down in March in an effort by the automaker to avoid making the same financial mistakes that sent it into bankruptcy in 2009. Trump has blasted HM's decision to close the plant, which produced more than 16 million vehicles over a span of several decades.
Workhorse manufactures electric delivery and utility vehicles. It also makes a carbon fiber, helicopter-looking flying vehicle called the SureFly Octocopter.
"This potential agreement creates a positive outcome for all parties involved and will help solidify the leadership of Workhorse's role in the EV community," Workhorse CEO Duane Hughes said in a press release Wednesday.
— CNBC's Ashley Turner contributed reporting.