On Friday, Mr. Ramamurti said he had yet to receive a response to his letter.

“Our mission is to determine how this $500 billion affects the financial well being of American families,” he said in an interview. “The only way we can figure out what the effect is on American families is if we figure out which American companies are getting money and what they’re doing with it.”

There have been growing concerns that Mr. Trump will not comply with oversight efforts, particularly after his selection of a White House lawyer, Brian D. Miller, to serve as the special inspector general at Treasury and his firing of the Pentagon’s inspector general, Glenn A. Fine, who had been tapped by the Council of the Inspectors General on Integrity to lead the new Pandemic Response Accountability Committee.

The economic stimulus legislation requires the Fed and Treasury to turn over an array of information after disbursing loans. However, Mr. Ramamurti is concerned that the information could be provided in aggregate, making it difficult for watchdogs or taxpayers to know how the money is being spent and which specific companies or sectors are benefiting.

The Fed is still determining how much information it will release on its new programs, but is expected to be more transparent with the efforts that use taxpayer funds than it has historically been with its emergency lending.

The Dodd Frank Act placed new reporting requirements on the central bank’s programs: it has to both update relevant Congressional committees on its plans shortly after announcing them, and then follow up with transaction details. The central bank plans to publish information on program use to its website, but it is still unclear if officials will name individual companies that benefit.

Daleep Singh, the recently-appointed head of the markets group at the Federal Reserve Bank of New York, discussed transparency in the text of prepared remarks on Friday.