The City of New York Procurement Policy Board (PPB) Rules authorize the Comptroller to maintain a list of prequalified auditors. PPB rule §3-10(k) states:
Prequalified List (PQL) of Auditors
“A PQL of auditors shall be maintained by the Comptroller in accordance with this section. An agency seeking to award an audit contract shall solicit only those suppliers that have been prequalified by the Comptroller.”