WASHINGTON — In the five days since he was named White House communications director, Anthony Scaramucci has vowed to hunt down leakers and fire anyone he catches. By the end of his fifth day, he was on the receiving end of what he called a leak about himself.

The financial disclosure form that Mr. Scaramucci filed with the government appeared on Politico’s website on Wednesday night, showing that he has assets worth as much as $85 million. He made $5 million in salary and another $4.9 million from his ownership stake in his investment firm SkyBridge Capital in the first six months of this year, according to the filing.

Mr. Scaramucci responded angrily. “In light of the leak of my financial disclosure info which is a felony,” he wrote on Twitter, “I will be contacting @FBI and the @TheJusticeDept.”

He added the hashtag #swamp, reflecting President Trump’s promise to drain the swamp, and then included the Twitter handle of Reince Priebus, the White House chief of staff, who opposed Mr. Scaramucci’s appointment last week.