It has led to criticism from political rivals and groups calling for aggressive action against the giant tech companies, as well as attention from local news organizations. Yet Mr. Becerra, who has been vocal about problems with Silicon Valley in the past, has remained fastidious about saying little about any potential investigations. He has neither confirmed nor denied that his office is examining Google, Facebook or any other tech company.

“No one except California and the A.G.’s office knows what, if anything, we’re doing with regard to either of those two or any other company in the internet space,” he said in an interview this week. He added that he was following his office’s longstanding practice not to speak publicly about a possible investigation.

Earlier this month, Mr. Becerra responded to a question about California not publicly endorsing the joint investigations by asking one of his own.

“How do you know we’re not investigating?” he said.

Mr. Becerra’s spokeswoman, Sarah Lovenheim, said the office did not disclose what it was or was not investigating to protect the integrity of its work. “It’s just our policy not to comment on any pending or potential investigations,” she said in a statement.

Other attorneys general offices are not offering any insight, either. Fabien Levy, a spokesman for Letitia James, the New York attorney general, said that her office “cannot comment on whether we have or have not had a conversation with another state about any of our investigations.”