One month after the top editor was ousted from The Markup, a fledgling nonprofit investigative tech news site, amid disagreements with the other two founders, more turbulence followed.

On Friday, Craig Newmark, the Craigslist founder and the site’s biggest backer, said in a statement that the site’s other two founders had departed.

“I’ve been informed that Sue Gardner and Jeff Larson are no longer with The Markup,” Mr. Newmark said in the statement, which he posted on his Twitter account.

The investigative journalist Julia Angwin, the original editor in chief, was fired from the site in April after having apparently lost a power struggle. After her sudden exit, several editorial staff members followed her out the door, citing her dismissal as the reason for their resignations.