15 USC 1641 (g)
(g) Notice of new creditor
(1) In general
In addition to other disclosures required by this subchapter, not later than 30 days after the date on which a mortgage loan is sold or otherwise transferred or assigned to a third party, the creditor that is the new owner or assignee of the debt shall notify the borrower in writing of such transfer, including—
(A) the identity, address, telephone number of the new creditor;
(B) the date of transfer;
(C) how to reach an agent or party having authority to act on behalf of the new creditor;
(D) the location of the place where transfer of ownership of the debt is recorded; and
(E) any other relevant information regarding the new creditor.
As used in this subsection, the term “mortgage loan” means any consumer credit transaction that is secured by the principal dwelling of a consumer.