Dominion Voting Systems filed suits against Newsmax Media Inc. and Herring Networks Inc.’s One America News Network. Dominion also sued Patrick Byrne, the former chief executive of Overstock.com Inc., an online seller of furniture and other goods.

Dominion accused the two networks of defaming the company and its products by airing false reports that its machines switched votes from President Donald Trump to Mr. Biden. The company also said Mr. Byrne repeatedly and falsely alleged that Dominion rigged vote tallies to steal the 2020 presidential election for Mr. Biden. In each of the three lawsuits, Dominion is seeking more than $1.6 billion in damages, citing lost profit and other costs.

“Newsmax helped create and cultivate an alternate reality where up is down, pigs have wings, and Dominion engaged in a colossal fraud to steal the presidency from Donald Trump by rigging the vote,” the suit against Newsmax says.