17 C.F.R. § 230.903
(a) An offer or sale of securities by the issuer, a distributor, any of their respective affiliates, or any person acting on behalf of any of the foregoing, shall be deemed to occur outside the United States within the meaning of § 230.901 if:
(b) Additional conditions—(1) Category 1. No conditions other than those set forth in § 230.903(a) apply to securities in this category. Securities are eligible for this category if:
(i) The securities are issued by a foreign issuer that reasonably believes at the commencement of the offering that:
(ii) The securities are offered and sold in an overseas directed offering, which means:
(iv) The securities are offered and sold to employees of the issuer or its affiliates pursuant to an employee benefit plan established and administered in accordance with the law of a country other than the United States, and customary practices and documentation of such country, provided that:
(2) Category 2. The following conditions apply to securities that are not eligible for Category 1 (paragraph (b)(1)) of this section and that are equity securities of a reporting foreign issuer, or debt securities of a reporting issuer or of a non-reporting foreign issuer.
(3) Category 3. The following conditions apply to securities that are not eligible for Category 1 or 2 (paragraph (b)(1) or (b)(2)) of this section:
(ii) In the case of debt securities:
(iii) In the case of equity securities:
(B) The offer or sale, if made prior to the expiration of a one-year distribution compliance period (or six-month distribution compliance period if the issuer is a reporting issuer), is made pursuant to the following conditions:
(1) The purchaser of the securities (other than a distributor) certifies that it is not a U.S. person and is not acquiring the securities for the account or benefit of any U.S. person or is a U.S. person who purchased securities in a transaction that did not require registration under the Act;
(2) The purchaser of the securities agrees to resell such securities only in accordance with the provisions of this Regulation S (§ 230.901 through § 230.905, and Preliminary Notes), pursuant to registration under the Act, or pursuant to an available exemption from registration; and agrees not to engage in hedging transactions with regard to such securities unless in compliance with the Act;
(3) The securities of a domestic issuer contain a legend to the effect that transfer is prohibited except in accordance with the provisions of this Regulation S (§§ 230.901 through 230.905, and Preliminary Notes), pursuant to registration under the Act, or pursuant to an available exemption from registration; and that hedging transactions involving those securities may not be conducted unless in compliance with the Act;
(4) The issuer is required, either by contract or a provision in its bylaws, articles, charter or comparable document, to refuse to register any transfer of the securities not made in accordance with the provisions of this Regulation S (§§ 230.901 through 230.905, and Preliminary Notes), pursuant to registration under the Act, or pursuant to an available exemption from registration; provided, however, that if the securities are in bearer form or foreign law prevents the issuer of the securities from refusing to register securities transfers, other reasonable procedures (such as a legend described in paragraph (b)(3)(iii)(B)(3) of this section) are implemented to prevent any transfer of the securities not made in accordance with the provisions of this Regulation S; and
(5) Warrants. An offer or sale of warrants under Category 2 or 3 (paragraph (b)(2) or (b)(3)) of this section also must comply with the following requirements:
(ii) Each person exercising a warrant is required to give:
[63 FR 9645, Feb. 25, 1998, as amended at 72 FR 71571, Dec. 17, 2007]