I would have guessed HMD, but they just pulled out of the US market: https://www.androidauthority.com/hmd-global-leaves-us-market...
However, Motorola/Lenovo seems the most logical partner, they were previously in the Android One program (which was sort of the successor to the Nexus line).
Some of their Xperia Compact models have been excellent, but they haven't been making them like that in recent years. Dare I hope for a return of their truly compact flagship phones and GrapheneOS support?
[1] https://github.com/chenxiaolong/avbroot/issues/299#issue-232...
The last one I tried (xperia z1 compact) bricked itself when I tried to re-lock the bootloader. Maybe it's safe on newer models?
If they ever make another good compact model, I suppose I should look for re-locking reports on it. Thanks for the link.