Regulation S, by the numbers
01
3
Issuer categories
Cat 1, 2, 3 — by SUSMI
02
40 days
Cat 2 distribution-compliance period
debt & non-reporting equity
03
1 year
Cat 3 compliance period
U.S. domestic equity
04
0
Directed selling efforts allowed
inside the United States
05
Rule 903
Safe harbor for issuers
offshore offering & sale
06
Rule 904
Safe harbor for resales
distributors & affiliates
Section 01

Why Reg S exists

Section 5 of the Securities Act of 1933 requires registration of any offer or sale of securities. Read literally, that reaches a London bond sold to a Tokyo investor — even with no U.S. nexus. Regulation S is the SEC's territorial-limits answer: an offshore offering, conducted entirely outside the United States and meeting certain conditions, is not subject to U.S. registration.

Two conditions are non-negotiable for any Reg S offering: the offer and sale must be made in an offshore transaction, and there must be no directed selling efforts in the United States. Everything else — compliance periods, transfer restrictions, certifications — varies by issuer category.

Section 02

The three issuer categories

Rule 902 sorts issuers by Substantial U.S. Market Interest (SUSMI). The category sets how long the distribution-compliance period runs and what the resale chain must certify.

CAT 1
Foreign issuers, no SUSMI
No compliance period

Foreign private issuers with no substantial U.S. market interest in the offered class. Lightest touch — no waiting period, no resale legend, minimal certification.

CAT 2
Reporting foreign issuers
40-day period

Exchange Act reporting issuers and certain debt offerings. 40-day distribution-compliance period; offering-restriction agreements with distributors required.

CAT 3
U.S. domestic equity
1-year period

Equity of U.S. domestic issuers. Strictest regime: 1-year period, transfer restrictions in the legend, and buyer certification of non-U.S. status.

Section 03

How a compliant sale runs

For a typical Category 2 offering, the path looks like this. Four steps, each a place where the safe harbor can be won or lost.

Section 04

Where deals go wrong

In practice, four issues account for most Reg S enforcement risk:

1. Directed selling efforts that slip through

A CEO's LinkedIn post, a U.S. press release timed to the offering, or a New York roadshow stop during the offering window — each can compromise the safe harbor even with “no offer” language.

2. U.S. persons in the buyer chain

A U.S. mailing address, a U.S. trust beneficiary, or a USD wire through a U.S. correspondent bank. The Rule 902 definition of “U.S. person” is broad, and one discovered mid-offering can taint the issuance.

3. Inadequate restrictive legend

Category 3 equity must carry a legend prohibiting resales to U.S. persons until the period ends. Missing or shortened legends are the easiest way to lose the safe harbor.

Section 05

Common questions

Can U.S. citizens living abroad buy in a Reg S offering?

No. Under Rule 902, a U.S. citizen is a U.S. person regardless of residence. The exceptions are narrow — primarily accounts held by non-U.S. dealers acting in a fiduciary capacity.

Does Reg S preempt state blue-sky laws?

No. State securities laws are not preempted. In practice, an offshore transaction with no U.S. nexus typically falls outside any state's jurisdiction by default.

Can I use Reg S for a token offering?

Yes — the same framework applies — but the “offshore transaction” and “no directed selling efforts” requirements are unusually hard to demonstrate for an internet-distributed asset. Most token issuers pair Reg S with technical geofencing.

What happens if the safe harbor fails?

The offering becomes an unregistered sale under Section 5. Rescission rights run for one year under Section 12(a)(1), and the SEC may bring enforcement under Section 8A.

Primary sources
4 documents
1990-04-24SEC
Release No. 33-6863 — Offshore Offers and Sales
The adopting release that created Regulation S and the offshore-transaction safe harbor.

Regulation S clarifies the extraterritorial application of the registration requirements of the Securities Act of 1933.

Read source ↗
17 CFRCFR
§§ 230.901–230.905 — Regulation S, as codified
The operative rules: definitions (902), issuer safe harbor (903), resale safe harbor (904).
1998-02-17SEC
Release No. 33-7505 — Problematic Practices Under Reg S
The amendments that classified equity of U.S. issuers as Category 3 and tightened the legend rules.
C&DISEC Staff
Compliance & Disclosure Interpretations — Reg S
Staff interpretations on directed selling efforts, U.S.-person status, and concurrent offerings.