Rule 506(b) vs Rule 506(c): what the difference means for investors

Regulation D is the set of rules that lets companies raise capital without registering the offering with the SEC. Rule 506 is by far its most-used provision, and it comes in two flavors. Rule 506(b) is the older, quieter path: no public advertising, a tightly controlled investor pool, and reliance on relationships. Rule 506(c), added later, trades privacy for reach. It lets issuers advertise openly, but only in exchange for stricter rules about who can buy and how their eligibility is confirmed.

Both exemptions accomplish the same thing for the issuer: they allow an unregistered sale of securities to qualified investors. The differences sit in three places, solicitation, who may invest, and verification, and those differences are what matter most to you.

A 506(b) offering may not use general solicitation or general advertising. The issuer cannot promote the deal through public channels: no open web pages pitching the raise, no mass emails to strangers, no seminars advertised to the public. In practice this means the offering reaches investors through an existing, substantive relationship between the issuer (or its representatives) and the investor.

• Up to 35 non-accredited investors may participate, but they must be sophisticated, able to evaluate the merits and risks of the investment, and unlimited accredited investors may join alongside them.
• When non-accredited investors are included, the issuer must provide specified disclosure, similar in substance to what a registered offering would supply.
• The issuer may generally rely on an investor's own representations about accredited status (self-certification, typically via a subscription questionnaire) provided it has no reason to doubt them.
• The pre-existing, substantive relationship is the norm: it is how an issuer demonstrates the offer was not the product of general solicitation.

Rule 506(c) flips the trade-off. General solicitation and advertising are expressly permitted, so a 506(c) issuer can market the raise publicly. In return, the rules tighten on the buyer side and, critically, on how status is confirmed.

• Every purchaser must be an accredited investor. There is no allowance for non-accredited participants, sophisticated or not.
• The issuer must take reasonable steps to verify that each purchaser is in fact accredited. Self-certification alone is not enough.
• Reasonable verification commonly involves reviewing documentation such as W-2s, tax returns, bank or brokerage statements, or a credit report, or obtaining a written confirmation from a qualified third party such as a licensed attorney, CPA, registered broker-dealer, or investment adviser.
• What counts as reasonable depends on the circumstances, including the type of investor and the nature of any prior relationship.

The verification requirement is the defining feature of 506(c). It is the obligation an issuer accepts in exchange for the right to advertise. A genuine 506(c) sponsor will have a real process for it, and will not be shy about asking you to substantiate your status.

Despite their differences, 506(b) and 506(c) offerings have a common backbone. Knowing what they share keeps you from misreading a normal feature as a warning sign.

• Both create restricted securities. Your interest cannot be freely resold; it is subject to holding-period and resale limitations, so plan on illiquidity.
• Both require the issuer to file a Form D notice with the SEC, generally within 15 days of the first sale. The Form D is a short notice of the offering, not an SEC approval of it.
• Both rely on Rule 506's status as a federal exemption that preempts state registration. The securities are 'covered securities,' though states may still require notice filings and fees.
• Both are subject to the Rule 506(d) bad-actor disqualification, which can disqualify an offering if certain people connected to it have specified disqualifying events in their background.

Because Form D is public, it is a practical starting point for diligence: it tells you which exemption the issuer claims, when the raise began, and who the named parties are, all of which you can cross-check against the issuer's own materials.

Both exemptions lean on the concept of an accredited investor, but they treat it differently. 506(b) permits a limited number of non-accredited (yet sophisticated) investors and lets the issuer rely on self-certification, while 506(c) requires that everyone be accredited and that the issuer verify it.

Accredited status is defined by SEC rules and rests on objective criteria: income or net-worth thresholds, or, for individuals, certain professional licenses or credentials. Entities can qualify on their own bases. The thresholds and categories are set by regulation and have been expanded over time, so confirm the current definition against the SEC's rules rather than relying on a remembered figure. For diligence purposes, the more useful question is whether a 506(c) issuer is doing the verification work the rule requires, not just whether you meet the definition.

The exemption an issuer selects is a window into how the offering is being run. Neither path is inherently safer, and plenty of sound deals use each, but a mismatch between the claimed exemption and the issuer's actual conduct is exactly the kind of inconsistency that warrants a closer look.

• Advertised deal, no real verification: claims 506(c) but treats accreditation as a checkbox. Investigate before going further.
• Cold-contact 'private' deal: claims 506(b) yet arrived with no prior relationship. Ask how the offer reached you.
• Missing or inconsistent Form D: no filing, or a Form D that names a different exemption or different parties than the marketing materials. Reconcile the discrepancy.
• Bad-actor exposure: people connected to the deal whose backgrounds could trigger Rule 506(d). Confirm the issuer has addressed it.

These are the same signals an automated screen looks for. Cross-referencing the claimed exemption, the Form D filing, and the named parties is the kind of structured check a Reg D Score is built to surface quickly: a starting point for your own judgment, not a substitute for it.