Quantegy has been in trouble for a while. They shut down production of their version of various Ampex formulations a couple of years ago, some changes were made in ownership, and the new owners took a shot at pulling the company out of trouble and making tape again. The latest step of the process has been to stop tape production altogether.
RMGI is a European company which has resurrected some AGFA/BASF formulas. Actully that tape has been available for a few months now. Possibly this had some recent impact upon Quantegy sales, but that is pure speculation on my part.
ATR Magnetics is owned by Mike Spitz of ATR Services and some partners. They formed the company in 2004 and have been working up their new tape formulation ever since. They are not related to Quantegy or RMGI. ATR Magnetics tape is not yet available except for a few samples (of which we were delighted to receive one), but the latest info indicates that they are starting to build a stock.
Each of these manufacturers has their own manufacturing plant.