10th Cir. R. 31.3: Joint briefing in civil appeals

(A) Multiple parties. In civil cases involving more than one appellant or appellee, including consolidated cases, all parties on a side (including intervenors) must—to the extent practicable—file a single brief. Where, however, multiple response briefs are filed pursuant to Rule 31.3(B), the appellant may file only one reply except upon motion to the court seeking an exemption.

(B) Certificate of counsel. Any brief filed separately by one of multiple parties on a side must contain a certificate plainly stating the reasons why the separate brief is necessary. The only exception to this requirement is if the only other party on a side filing separately is a government entity under Rule 31.3(D).

(C) Extension of time. On motion, the Clerk may extend the time for briefing to allow the parties time to coordinate a single brief.

(D) Government entities exempt. This rule does not apply to government entities.