Rule 506 of Regulation D provides a safe harbor exemption that allows issuers to offer and sell securities through a private placement without SEC registration. It includes two pathways—Rule 506(b) and Rule 506(c)—each with different rules for investor eligibility, solicitation, and verification.
Under Rule 506, companies can raise unlimited capital, avoid the cost and complexity of public registration, and sell securities to accredited investors (and in some cases, a limited number of sophisticated non‑accredited investors). Issuers must still comply with anti‑fraud rules, Form D filing requirements, and applicable state blue‑sky notice filings.

