For more than half an hour on Wednesday morning, economists and investors were stuck repeatedly refreshing their browsers, looking for a delayed report on the U.S. job market from a government website.

Not everyone had to wait that long.

A number of Wall Street investment firms obtained details about the report — which showed a large downward revision to job growth in 2023 and early 2024 — at least 15 minutes before the information was posted on the Bureau of Labor Statistics website. That head start could, at least in theory, have given in-the-know investors an opportunity to profit on the information before the public at large.

It isn’t clear how many people got early access to the data, or whether anyone actually traded on it. Markets seemed to react little to the revision in jobs data either before or after the general release. But the episode was the latest in a series of incidents in which the agency provided information to investors that wasn’t available to the general public.

In February, an employee of the labor bureau sent information about housing inflation — at the time, an issue of intense interest to many investors — to a group of “super users” that included a number of hedge funds. The information turned out to be inaccurate, but even if that had not been the case, agency leaders said, it was inappropriate to share information selectively.

Then, in May, the agency said it had inadvertently posted data on the Consumer Price Index — one of the highest-profile monthly economic reports — 30 minutes before the scheduled release time. The files in question are closely monitored by Wall Street firms but not by less sophisticated users.

Taken together, the incidents raise concerns about the agency’s handling of sensitive information, said Julia Coronado, founder of MacroPolicy Perspectives, a research firm with Wall Street clients.