Route 1: secondary sales of private shares
Employees and early investors sometimes sell private-company shares through regulated secondary platforms or broker-dealers. These sales are usually private placements, and the SEC notes that many offering exemptions limit participation to accredited investors (SEC, June 12, 2024).
An individual qualifies as an accredited investor with income over $200,000 ($300,000 with a spouse or partner) in each of the prior two years, net worth over $1 million excluding the primary residence, or a Series 7, 65 or 82 license in good standing.