17 C.F.R. § 229.1607
(a) Report, opinion, or appraisal. Disclose the information required by paragraph (b) of this section if the special purpose acquisition company or SPAC sponsor has received any report, opinion (other than an opinion of counsel) or appraisal from an outside party or an unaffiliated representative referred to in § 229.1606(d) (Item 1606(d) of Regulation S-K) materially relating to:
(b) Preparer and summary of the report, opinion, appraisal, or negotiation. For each report, opinion, or appraisal referred to in paragraph (a) of this section or any negotiation or report described in response to § 229.1606(d) (Item 1606(d) of Regulation S-K) concerning the terms of the transaction:
(4) Describe any material relationship that existed during the past two years or is mutually understood to be contemplated and any compensation received or to be received as a result of the relationship between:
(6) Furnish a summary concerning the negotiation, report, opinion, or appraisal. The summary must include but need not be limited to: the procedures followed; the findings and recommendations; the bases for and methods of arriving at such findings and recommendations; instructions received from the special purpose acquisition company or SPAC sponsor; and any limitation imposed by the special purpose acquisition company or SPAC sponsor on the scope of the investigation.
Instruction 1 to paragraph (b): The information called for by paragraphs (b)(1) through (3) of this section must be given with respect to the firm that provides the report, opinion, or appraisal or participates in the negotiation rather than the employees of the firm that prepared the report, opinion, or appraisal or participated in the negotiation.