Reportimg "Asre Bazar", ATA declined to comment on whether a firm contract has been signed or elaborate on the type and the value of planes included in the order.
A press release quoted the owner of the airline, Mohammadreza Zonnouri, as saying the 50-seat planes will be delivered within the next six months.
ATA performs 80 flights per day, making it the fourth busiest Iranian airline after Iran Air, Mahan and Aseman.
It operates 8 McDonnell Douglas MD-83s, three Airbus A320s and four Boeing 737s.
Embraer competes internationally with Canadian rival Bombardier for the title of third-largest airplane maker after Airbus and Boeing.
The company organized events from August 29 to 31, 2016 in Tehran, including an educational session and a conference.
The planemaker also operated two demonstration flights around Tehran using an Embraer E190 model, a double-engine 100-seat capacity regional jet.