These people almost always earn more than $200,000 a year and so qualify as "accredited investors" under the SEC's definition. Keep in mind, too, that start-ups can compensate their unaccredited employees with equity just the same.
Disclaimer: I am not a lawyer. This is not legal nor securities advice.
Actually not, because accredited investors must have cleared $200k for the two previous calendar years and most people who co-invest under the knowledgeable employees exemption are PE associates who have been on the job for less than two years.
Source? (Private equity associates are entry-level number crunchers. Their fraction of carry is a rounding error, if positive.)
Private equity associates very rarely receive carry, which is why they co-invest instead.
*edited for clarity
The vast majority of partner co-investment vehicles I've come across contain partners' capital. A rounding error may be from associates, who are usually counted against the limited number of unaccredited investors such funds can, with great legal liability, be marketed to.