While http://levels.fyi has solved this problem for BigTech, startup compensation is hidden behind benchmarking tools like OpenComp and Pave.
http://topstartups.io has user-submitted data, but doesn't do aggregate stats.
In the future, I'll add more details like:
- level splits
- equity value
- years at startup
- valuation
- salary / equity %iles, etc.
Please let me know if any particular slices of this data are interesting to you!