Yeah, my ballpark estimate from my portfolio (~50 investments in my fund + ~20 personal angel investments) is that 20-25% dilution is common at seed stage. Occasionally it's 15%, which is great. Occasionally you also see 30+%, and that's pretty bad.
Would it possible to provide more granular data(anonymized, of course)? What was the mean, median etc dilution for your seed investments? And same for when your portfolio companies go on to raise a Series A? Thanks!