Mr Cooper Group Inc (COOP)

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THE REASON FOR COLLECTING W-9
IMO.
(b) A trust all of which is treated as owned by one or more grantors or other persons -

(1) In general. In the case of a trust all of which is treated as owned by one or more grantors or other persons, and which is not described in paragraph (b)(6) or (7) of this section, the trustee may, but is not required to, report by one of the methods described in this paragraph (b) rather than by the method described in paragraph (a) of this section. A trustee may not report, however, pursuant to paragraph (b)(2)(i)(A) of this section unless the grantor or other person treated as the owner of the trust provides to the trustee a complete Form W-9 or acceptable substitute Form W-9 signed under penalties of perjury. See section 3406 and the regulations thereunder for the information to include on, and the manner of executing, the Form W-9, depending upon the type of reportable payments made.

https://www.law.cornell.edu/cfr/text/26/1.671-4