All major legislation in the House necessitates a special rule from the Rules Committee before it can be brought to the chamber floor. These rules often strictly limit floor amendments to bills considered by the House. Scholars of political parties have argued that the House majority party can bias policy output away from the floor median through its usage of restrictive rules. In this article, we argue that in order to secure the passage of restrictive rules, the majority often makes concessions to centrist legislators through the amending process. We examine this theory using a newly collected data set that includes all amendments considered by the Rules Committee during the construction of structured rules in the 109th, 110th, and 111th Congresses (2005)(2006)(2007)(2008)(2009)(2010). Our results are mixed, but they do suggest that moderate members of the majority party often receive concessions via amendments for their support of the majority party's agenda-setting regime.Despite Congress having a reputation as an institution beset by partisan gridlock, the modern day US House of Representatives is a quite efficient legislative machine. In contrast to the more deliberate Senate, cohesive majorities can and do process legislation through the House while using precious little plenary time. The primary procedural tool that allows this kind of legislative efficiency is the special rule. The House Committee on Rules issues simple, yet flexible, resolutions that allow the chamber to choose bills to be considered and establish the terms and length of debate on bills. These special rules can increase legislative efficiency by limiting the time allowed for debate and restricting the number, as well as the content, of amendments allowed to be considered. The permissiveness of rules can range from those that allow all germane amendments (i.e., open rules) to those that allow a limited set of