New York’s top bank regulator has launched its own investigation into whether banks are rigging the almost $13 trillion Treasury market.

In early August, the New York Department of Financial Services sent letters to nine banks, including Goldman Sachs, Deutsche Bank and Barclays, asking for records relating to Treasury auctions, a person directly familiar with the letters told The Post on Wednesday.

The probe by the DFS, led by Acting Superintendent Anthony Albanese, runs alongside a Justice Department investigation. Both are taking a hard look into at least three of the 22 primary dealers who bid on Treasury auctions, The Post reported exclusively in June.

The Financial Times first reported on the New York probe.

The DFS letters were described as a general inquiry and don’t accuse the banks of any wrongdoing.

Other banks getting letters include Bank of Nova Scotia, Mizuho, BNP Paribas and the US arm of Société Générale.

The probes come as a federal judge has consolidated about 15 lawsuits against the banks into one suit. The lead law firm is expected to be named by the end of October.