Immediate-effectiveness fast track (1975–present)
Since the 1975 Securities Acts Amendments added Section 19(b)(3)(A), the SEC has let rule changes that do not significantly affect investor protection or competition take effect on filing, subject to a 60-day suspension window.
Most routine SRO filings go live immediately; contested ones get suspended and reviewed.
The fast track keeps rulebooks current while the suspension power checks genuinely controversial changes.
This is the mechanism that let PHLX's gift rule become effective on September 8, the day it was filed.
