(2) When Permitted. The United States or its officer or agency or a state may file an amicus brief without the consent of the parties or leave of court. Any other amicus curiae may file a brief only by leave of court or if the brief states that all parties have consented to its filing, but a court of appeals may prohibit the filing of or may strike an amicus brief that would result in a judge’s disqualification.
(3) Motion for Leave to File. The motion must be accompanied by the proposed brief and state:
(B) the reason why an amicus brief is desirable and why the matters asserted are relevant to the disposition of the case.
(B) a table of contents, with page references;
(C) a table of authorities — cases (alphabetically arranged), statutes, and other authorities — with references to the pages of the brief where they are cited;
(D) a concise statement of the identity of the amicus curiae, its interest in the case, and the source of its authority to file;
(E) unless the amicus curiae is one listed in the first sentence of Rule 29(a)(2), a statement that indicates whether:
(ii) a party or a party’s counsel contributed money that was intended to fund preparing or submitting the brief; and
(iii) a person — other than the amicus curiae, its members, or its counsel — contributed money that was intended to fund preparing or submitting the brief and, if so, identifies each such person;
(G) a certificate of compliance under Rule 32(g)(1), if length is computed using a word or line limit.
(6) Time for Filing. An amicus curiae must file its brief, accompanied by a motion for filing when necessary, no later than 7 days after the principal brief of the party being supported is filed. An amicus curiae that does not support either party must file its brief no later than 7 days after the appellant’s or petitioner’s principal brief is filed. A court may grant leave for later filing, specifying the time within which an opposing party may answer.
(7) Reply Brief. Except by the court’s permission, an amicus curiae may not file a reply brief.
(8) Oral Argument. An amicus curiae may participate in oral argument only with the court’s permission.
(2) When Permitted. The United States or its officer or agency or a state may file an amicus brief without the consent of the parties or leave of court. Any other amicus curiae may file a brief only by leave of court.
(3) Motion for Leave to File. Rule 29(a)(3) applies to a motion for leave.
(4) Contents, Form, and Length. Rule 29(a)(4) applies to the amicus brief. The brief must not exceed 2,600 words.
(5) Time for Filing. An amicus curiae supporting the petition for rehearing or supporting neither party must file its brief, accompanied by a motion for filing when necessary, no later than 7 days after the petition is filed. An amicus curiae opposing the petition must file its brief, accompanied by a motion for filing when necessary, no later than the date set by the court for the response.
US Supreme Court // ©
(As amended Apr. 24, 1998, eff. Dec. 1, 1998; Apr. 28, 2010, eff. Dec. 1, 2010; Apr. 28, 2016, eff. Dec. 1, 2016; Apr. 26, 2018, eff. Dec. 1, 2018.)


