Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9MJC callsign genealogy
Currently held by Collier, Michael J
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W9MJC's current licensee, walking backwards.
- Collier, Michael JILgranted 2025-10-01cancelled 2026-02-13
Successor callsigns
Callsigns held now by people who previously held W9MJC.
All historical holders
Every license row we've seen with the callsign W9MJC, oldest first.
- Cammilleri, Michael J WI2015-10-24 → cancelled 2019-10-08
- Collier, Michael J IL2026-02-13 → cancelled 2026-07-17