Within 30 days after the plan administrator or the contributing sponsor knows or has reason to know that a reportable event described in subsection (c) has occurred, he shall notify the corporation that such event has occurred, unless a notice otherwise required under this subsection has already been provided with respect to such event. The corporation is authorized to waive the requirement of the preceding sentence with respect to any or all reportable events with respect to any plan, and to require the notification to be made by including the event in the annual report made by the plan.
Any information or documentary material submitted to the corporation pursuant to this section shall be exempt from disclosure under section 552 of title 5, and no such information or documentary material may be made public, except as may be relevant to any administrative or judicial action or proceeding. Nothing in this section is intended to prevent disclosure to either body of Congress or to any duly authorized committee or subcommittee of the Congress.