Here is something from the National Association of Realtors. Granted, it varies across states (TX leading with highest 28%)

> Institutional buyers made up 13% of the residential sales market in 2021, with the median purchase price of institutional buyers typically 26% lower than the states’ median purchase prices (Slides 6 – 15).

Source: https://cdn.nar.realtor/sites/default/files/documents/2022-i...