Institutional vs. Retail breakdown

Does anyone know what the approximate % split is between institutional investors and retail investors? I know pensions just run ish as far as equity markets go. I’m essentially trying to figure out what’s keeping this market propped besided QE(I, II, III).

Federal Reserve Flow of Fund data might help. It’s used in this paper to measure allocations between retail and institutional investors…https://www2.bc.edu/~tehranih/Hassan%20published%20paper/Relative%20Sentiment%2010_20_09.pdf