Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4MRK callsign genealogy
Currently held by COX, SHARON A
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 K4MRK's current licensee, walking backwards.
- Jones, Mark ATNgranted 2023-07-29cancelled 2025-02-25
Successor callsigns
Callsigns held now by people who previously held K4MRK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MRK, oldest first.
- COX, SHARON A CA2010-07-03 → cancelled 2022-09-20
- Jones, Mark A TN2025-02-25 active