user@machine:~/illumos-gate$ git log --since 2023-09-10 | grep ^Author | awk -F @ '{print $2}' | sed 's/>$//' | sort | uniq -c | sort -n | tail
         11 mnx.io
         16 grumpf.hope-2000.org
         18 gmail.com
         21 oxide.computer
         29 hamachi.org
         36 richlowe.net
         37 racktopsystems.com
         71 fiddaman.net
         91 fingolfin.org
        125 me.com

I'm not going to post names because that feels a touch icky, but a little bit of cross-comparison suggests that one of those domains should be combined with oxide (read: I search for names and they work there) in a way that does probably make Oxide more than 50% of commits in the last year. Though even if that's true it doesn't make them the only player or anything.