17 CFR 239.25 : Commodity And Securities Exchanges (§ 1.1 To Parts 451-499) — (§ 200.1 To § 239.900) — Securities And Exchange Commission (§ 200.1 To § 239.900) — Forms Prescribed Under The Securities Act Of 1933 (§ 239.0-1 To § 239.900) — Forms For Registration Statements (§§ 239.4-239.10 To § 239.65) — Form S-4, for the registration of securities issued in business combination transactions.