Exhibit 4 FORM OF AGREEMENT AND PLAN OF REORGANIZATION THIS AGREEMENT AND PLAN OF REORGANIZATION (the "Agreement") is made as of this [__] day of [__], 200_, by and among Janus Adviser Series, a Delaware statutory trust (the "JAD Trust"), on behalf of...Agreement and Plan of Reorganization • March 17th, 2009 • Janus Investment Fund • Massachusetts
