A Russian technology executive who was named in a dossier containing unverified allegations about connections between President Trump and the Russian government has sued BuzzFeed News, which published the information.

The defamation suit was filed in court on Friday in Broward County, Fla., according to lawyers for the executive, Aleksej Gubarev, the chief of XBT, a technology company based in Luxembourg. The suit focuses on allegations, made near the end of the dossier, that Mr. Gubarev and his company were involved in hacking operations against the leadership of the Democratic Party.

In the complaint, Mr. Gubarev’s lawyers say that BuzzFeed acted recklessly; that none of the statements have any basis in fact; and that Mr. Gubarev’s association with the dossier has left his reputation “in tatters,” compromised his family’s security and damaged his company’s business prospects. It called BuzzFeed’s decision “perhaps one of the most reckless and irresponsible moments in modern ‘journalism.’”

The publishing of the dossier was one of the most startling moments of the weeks before Mr. Trump’s inauguration.