Also known as Title IV of the JOBS Act, Regulation A+ allows startups to raise up to $50 million per year from an unlimited number of investors, no matter how wealthy they are. Companies can think of Regulation A+ as a mini-IPO, allowing them to gauge public interest without the strenuous fees and reporting requirements of actually going public before they're ready.
Investors are also limited in the amount of capital they may invest in Regulation A+ startups per year. Non-accredited investors may legally invest no more than 10% of their income or net worth—whichever is greater. Accredited investors (those who have an income of $200K+ or have a net worth of over $1 million) have no investing limit.
To find out your investment limits, open an investor account.