What Is Regulation D?

Regulation D (Reg D) is the workhorse exemption startups use to raise money in private offerings without doing a full SEC-registered public offering. In plain English: it’s how most startups legally take checks from investors (usually accredited investors) in a way that’s faster and cheaper than “going public.”

The core idea: Reg D is a set of safe harbors under Section 4(a)(2)

U.S. securities law generally requires you to register an offer and sale of securities with the SEC unless an exemption applies. Reg D is a set of SEC rules that provides “safe harbors” that issuers can use to rely on the private offering exemption (often referred to as Section 4(a)(2)).

Most startup “private rounds” you’ve heard of (pre-seed, seed, Series A) are done under Reg D—usually Rule 506(b) or Rule 506(c).

Quick answer: the Reg D routes founders actually use

Reg D includes multiple rules, but in startup fundraising, the practical decision is usually between Rule 506(b) and Rule 506(c):

• Rule 506(b): no general solicitation; you can include accredited investors and up to 35 non-accredited investors (who must meet “sophisticated” standards).
• Rule 506(c): general solicitation is allowed, but every investor must be accredited and you must take “reasonable steps” to verify accredited status.

There is also Rule 504, which exists inside Reg D and has its own conditions and limits. Many venture-style rounds do not use it; talk to counsel if you think it might fit your situation.

Rule 506(b): the default private round

Rule 506(b) is the most common Reg D pathway for startups raising from angels and funds through a private network.

• You can raise an unlimited amount (there isn’t a federal dollar cap in Rule 506(b)).
• You cannot use general solicitation or general advertising. Whether something counts as “general solicitation” is facts-and-circumstances and can get subtle fast.
• You can sell to accredited investors, plus up to 35 non-accredited investors who are sophisticated (and additional disclosure obligations may apply when non-accredited investors participate).
• Investors typically self-certify accredited status in 506(b), but you still need a reasonable basis to believe they’re accredited.

Rule 506(c): you can market, but you must verify

Rule 506(c) was added as part of the JOBS Act era to allow startups to publicly market a private offering, as long as sales are limited to accredited investors and the issuer verifies that status.

• You can generally solicit (for example, you can advertise the offering).
• Every purchaser must be accredited.
• You must take “reasonable steps” to verify each investor is accredited. This is more than a checkbox; many issuers use third-party verification or collect specific documentation.

The tradeoff is straightforward: 506(c) gives you more freedom to talk about your raise publicly, but it adds process and friction around verification.

Key practical distinctions founders should care about

1) “General solicitation” is the line you can’t accidentally cross

If you plan to raise under 506(b), treat anything that looks like public marketing as risky. In practice, founders run into issues when they post “we’re raising” messages broadly on social media, blast investor lists they don’t actually know, or otherwise market the deal publicly.

2) “Accredited investor” status drives who can invest and what you must do

Under 506(c), only accredited investors can invest, and you must verify. Under 506(b), non-accredited investors can participate in limited numbers if they are sophisticated, but bringing non-accredited investors into a 506(b) round can increase complexity (especially around disclosures). Whether it’s worth it depends on your facts and your investor mix.

3) Reg D is federal; states still matter (but 506 helps)

Rules 506(b) and 506(c) are widely used in part because they preempt many state-level registration requirements. That said, states can still require notice filings and fees, and you still need to comply with anti-fraud rules everywhere.

How Reg D compares to Reg CF (and how founders combine them)

Reg D and Regulation Crowdfunding (Reg CF) are different tools:

• Reg D is usually the tool for private rounds with angels and funds. Depending on which rule you use, you may be limited in how publicly you can market the offering and/or who can invest.
• Reg CF is a crowdfunding exemption that lets companies raise online from the general public (including non-accredited investors), subject to an annual cap set by SEC rules and specific disclosure and platform/intermediary requirements.

Some companies run both—often because they want a traditional private round plus a community component. Whether you can run them simultaneously, and how you message each, is a compliance question that depends heavily on timing and communications. Get counsel if you’re planning a combined strategy.

Filing and compliance basics (what’s usually required)

Most Reg D offerings involve:

• Form D filing with the SEC after the first sale (the SEC’s rule sets a deadline, commonly described as 15 days after first sale).
• State “blue sky” notice filings and fees as applicable.
• Maintaining good offering records (who received what materials, who invested, and what representations they made).

Reg D does not create the kind of ongoing public reporting regime you’d see in a registered offering, but you still have to comply with anti-fraud rules and whatever contractual reporting you agree to with investors.

Rule 506(b) vs 506(c): side-by-side

Feature	Rule 506(b)	Rule 506(c)
General solicitation	Not permitted	Permitted
Who can invest	Accredited investors, plus up to 35 non-accredited investors who are sophisticated	Only accredited investors
Accredited investor checks	Investor representations are commonly used; issuer still needs a reasonable basis	Issuer must take reasonable steps to verify accredited status
Federal raise limit	No federal cap	No federal cap
SEC filing	Form D after first sale (deadline set by SEC rules)	Form D after first sale (deadline set by SEC rules)

Frequently asked questions

Do I need a lawyer for a Reg D round?

In most cases, you should involve a securities lawyer. Reg D is conceptually simple, but the details (solicitation, disclosures, investor eligibility, broker-dealer issues, integration with other offerings, state notices) are where companies get in trouble. Even if you use standardized templates for a SAFE or note, you still need the compliance decisions to be right for your facts.

Can non-accredited investors invest in a Reg D round?

Sometimes. Under Rule 506(b), you can sell to up to 35 non-accredited investors who meet sophistication requirements, and additional disclosure obligations may apply. Under Rule 506(c), purchasers must be accredited.

Is there a maximum amount I can raise under Reg D?

Rules 506(b) and 506(c) do not impose a federal cap on the amount raised, but other constraints (investor appetite, platform or intermediary policies, and practical disclosure/legal considerations) still apply.

Bottom line

Reg D is the standard way startups raise private capital in the U.S. Your main fork in the road is 506(b) versus 506(c): 506(b) is “private network, no public marketing,” while 506(c) is “you can market publicly, but you must verify accreditation and sell only to accredited investors.” The right choice depends on how you plan to source investors, how public you want to be, and how much compliance friction you can tolerate.