What Is Regulation D? Definition, How It Works and Examples

The Securities Act of 1933 says that every offer and sale of securities must be registered with the SEC, unless an exemption applies. Registration means filing a full disclosure document and waiting for it to take effect, as a company does before an IPO. The Act itself exempts private placements, sales “not involving any public offering,” but it never says where that line is.

Regulation D draws the line in writing. It is a group of SEC rules, numbered 500 to 508, that list exact conditions. A company that meets them can be confident its sale is exempt. The rules cover only sales by the company itself. A holder who later resells the shares needs a different exemption.

Regulation D does not switch off the rest of the law. Anti-fraud rules still apply in full, so a misleading pitch is unlawful in a private deal too. State securities laws also still apply. For Rule 506 deals, federal law overrides state registration, but states can ask for a notice filing and a fee.

Regulation D contains three exemptions today. They differ on four points: who may buy, whether the deal can be advertised, how much can be raised and what buyers must be told. The table puts them side by side.

An accredited investor is a person or entity that passes the SEC’s tests. For an individual, that means a net worth above $1 million without the home, or income above $200,000 in each of the last two years. A sophisticated investor has enough business experience to judge the deal, alone or with an adviser. Bad actors are issuers or people with certain fraud convictions or sanctions, and their presence removes the exemption.

Rule 506(b) is the workhorse. Companies raised $378B under it in the year to June 2025, against $24B under Rule 506(c) and $300M under Rule 504. Funds raised another $1.9T under Rule 506(b). Rule 506(c), the only route that allows general solicitation, has its own guide to Reg D 506(c).

Reg D rules are short and work together. Three of them are the exemptions. The rest are definitions and conditions that every Regulation D deal must meet.

• Rule 500Sets the scope. Anti-fraud rules and state law still apply, and Regulation D covers only sales by the issuer.
• Rule 501Defines terms, including accredited investor, and explains how to count buyers. Accredited investors are not counted toward the 35-buyer limit.
• Rule 502Sets the general conditions. It covers what information non-accredited buyers get, the ban on general solicitation and the limits on resale.
• Rule 503Requires the Form D notice within 15 calendar days of the first sale.
• Rule 504The small-offering exemption, capped at $10M in 12 months.
• Rule 506The exemption with no dollar limit, in two versions: 506(b) without advertising and 506(c) with it.
• Rule 507Blocks Rules 504 and 506 for a company under a court order for breaking the Form D rule.
• Rule 508Forgives small slips made in good faith. Three are never small: advertising where it is banned, going over the Rule 504 cap and going over the 35-buyer limit.

Rule 502 is the one investors feel most. It makes the securities restricted securities. The company asks whether you buy for yourself, tells you in writing that the shares are unregistered and marks them with a legend. A later sale needs its own exemption, such as Rule 144 or a sale to large institutions under Rule 144A.

Yes. Regulation D is in force as of October 2026, and the SEC has amended it several times since 1982. The changes below explain why older guides describe rules that no longer exist.

• March 8, 1982The SEC adopts Regulation D to make raising capital easier for small businesses.
• September 23, 2013Rule 506(c) takes effect. Companies may advertise if every buyer is accredited and verified.
• January 20, 2017The Rule 504 cap rises from $1M to $5M, and bad actors are barred from it.
• May 22, 2017Rule 505 is repealed, leaving Rules 504 and 506 as the exemptions.
• March 15, 2021The Rule 504 cap rises from $5M to $10M as part of a wider update of exempt offerings.

If a guide mentions Rule 505 or a $1M limit for Rule 504, it predates these changes. Check the current rule text on the SEC or eCFR site before relying on any figure.

Take a company that wants to raise $30M. The company and every number here are illustrative. It has 40 accredited investors lined up and 5 employees who want in but are not accredited.

The accredited-only version of Rule 506(b) needs the least paperwork. Its cost is that the employees cannot invest in this round. Whichever route the company takes, if the first investor pays on day 1, the Form D is due by day 15.

For an investor, Regulation D shows up as a few questions in the purchase documents. You confirm your accredited status, or prove it in a 506(c) deal. You confirm you buy for yourself. You accept that the shares cannot be resold freely. Investing through an SPV works the same way, because the vehicle often sells its own interests under Regulation D.

Regulation D is mostly used by young companies. The SEC staff found that 82% of operating companies raising under it over the past three years were less than three years old. Early-stage shares carry the risks described in our guide to pre-IPO risks. A company that wants ordinary investors to buy, and wants the shares to be freely tradable, can use Regulation A+ instead.

Common Mistakes

• Calling Regulation D unregulatedThe sale skips registration, but anti-fraud rules, state notice rules and bad-actor bans still apply.
• Relying on an old guideRule 505 was repealed in 2017, and the Rule 504 cap is now $10M.
• Treating Form D as approvalForm D is a notice. The SEC does not review or approve the deal.
• Advertising a 506(b) dealPublic marketing is banned under 506(b), and Rule 508 never forgives that slip.
• Assuming the shares are liquidRegulation D securities are restricted. Resale needs its own exemption.

Regulation D

SEC Rules 500 to 508, which set conditions for selling securities without registration.

Registration

Filing a full disclosure document with the SEC before a public sale of securities.

Private placement

A sale of securities to selected investors under an exemption from registration.

Accredited investor

A person or entity that passes the SEC’s income, wealth or license tests.

Sophisticated investor

A buyer with enough business experience to judge a deal, alone or with an adviser.

General solicitation

Public advertising of an offering, allowed under Rule 506(c) only.

Restricted securities

Securities bought in a private sale. They need registration or an exemption to be resold.

Bad actors

Issuers or related people with certain fraud convictions or sanctions, which bar the exemption.

Form D

The short notice filed with the SEC within 15 days of the first sale.

Figures were last checked on October 21, 2026. The rules are United States federal rules. State rules add notice filings and fees, so check the current text before you act.