Aiming to preempt potential Republican rivals, Trump made the announcement at his Mar-a-Lago estate in Florida a week after midterm elections showed that the party had failed to win as many seats in Congress as it had hoped.

Shares of Digital World Acquisition Corp, the blank-check company looking to take Trump's social media venture Truth Social public, jumped 9% in premarket trading. DWAC was also the most trending ticker on retail investor-focused social media forum Stocktwits.

Earlier this week, DWAC reminded stockholders to vote in favor of extending the completion deadline for the proposed deal with Truth Social.

"With Twitter no longer his platform for getting his views out there, there'll likely be a lot more traffic and publicity for Truth Social," said Craig Erlam, senior market analyst at OANDA.

"In fact, any company tied to Trump and his various projects since leaving the White House will likely attract a lot more free publicity, which in most cases is no bad thing for their stock price."

Software developer Phunware Inc, which was hired by Trump's 2020 presidential re-election campaign to build a phone app, jumped 9.2%.

Rumble Inc, a Canadian video platform popular with conservatives, gained 1.6% in low trading volumes. Trump's Truth Social announced in August it would join Rumble's new ad platform as its first publisher in August.

Artificial intelligence solutions company Remark Holdings, which has been linked to the former president on social media sites, gained 5.7%. Reuters could not independently verify the link between Trump and Remark.

(Reporting by Shreyashi Sanyal in Bengaluru; Editing by Devika Syamnath)

By Shreyashi Sanyal