According to two Major League Baseball sources, close to Christian Red and Nathaniel Vinton of the New York Daily News, an insurance carrier associated with several baseball teams may be responsible for leaking sensitive financial documents.

Deadspin.com and the Associated Press published a series of confidential financial reports for the Pittsburgh Pirates, Tampa Bay Rays, Florida Marlins, Seattle Mariners, Los Angeles Angels and Texas Rangers.

The reports show how small market teams such as the Pirates make millions in profits despite poor on-field performances.

“It was beneficial, some of the information,” said one of the sources. “I think a lot of people were glad to see that the receipts were higher” but not happy to see some “transfer of equity was not going toward players and player development.”