I thought they have a monopoly on ejection seats, but I've found at least 1 other manufacturer: https://www.collinsaerospace.com/what-we-do/industries/milit...

Martin Baker's website is a bit wild, you can join their "tie club", but to do so you need to have ejected using their seat: https://martin-baker.com/tie-club/

And they list the ejections they know of https://martin-baker.com/ejection-notices/ , but the records are a bit jumbled, the latest entries include ejections in the past that they've discovered, and they don't all have dates, even "Someone successfully ejected today". Today when, man?!