Medium Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Situational Awareness; Distraction
Conflict NMAC
Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action
Aircraft
Training in progress on Final West with developmental who is close to qualification. Trainee issued a 040 vector to Aircraft X to intercept Runway 7L localizer and descend to 4;000; a second [aircraft] was on a south downwind for Runway 7R. Aircraft X was instructed to reduce speed to 210 knots; and issued traffic on primary only traffic (no altitude indicated); '12 o'clock; 4 miles; southbound; altitude unknown'.  Aircraft X joined the 7L localizer and reported they had the no-transponder aircraft in sight and it appeared to be a Cessna and passed them by 500 feet. Aircraft X was issued traffic on the 7R [traffic]; which was subsequently reported in sight; and also advised they would be filing a near miss on the no-transponder aircraft.Non-transponder equipped aircraft are common and plentiful in and around Anchorage TRACON's airspace; and mostly operate low-level; below 1;500 feet AGL. This incident would not have happened if either (1) the non-transponder equipped aircraft were talking to us; (2) the aircraft had an operational mode C transponder; or (3) ANC's class C airspace extended out to protect the Runway 7L/7R final approach courses (and Runway 33/15 departure/arrival corridor). This will continue to happen until the airspace around ANC is changed to protect from VFR aircraft not talking to ATC; with or without a transponder; from flying through the final approach course.
A11 Controller reported turning an aircraft on to final with traffic ahead for another runway. Additional traffic was issued to a non-transponder equipped aircraft. Pilot observed both aircraft and advised reported that they would be fling a Near Mid Air Collision report on the unknown aircraft.