UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	May 8, 2009 1:15 P.M.

Form:

N-14

CIK: 0000277751 Company Name: JANUS INVESTMENT FUND File Number: 333-158035 SERIES/CLASSES (CONTRACTS) MERGERS CIK Series ID Class/Contract Name Acquiring: 0000277751 JANUS INVESTMENT FUND S000010490 Janus Enterprise Fund C000077737 Class A Target: 0001110822 JANUS ADVISER SERIES S000010558 Janus Adviser Mid Cap Growth Fund C000029128 Class A CIK Series ID Class/Contract Name Acquiring: 0000277751 JANUS INVESTMENT FUND S000010490 Janus Enterprise Fund C000077738 Class C Target: 0001110822 JANUS ADVISER SERIES S000010558 Janus Adviser Mid Cap Growth Fund C000029129 Class C CIK Series ID Class/Contract Name Acquiring: 0000277751 JANUS INVESTMENT FUND S000010490 Janus Enterprise Fund C000077739 Class I Target: 0001110822 JANUS ADVISER SERIES S000010558 Janus Adviser Mid Cap Growth Fund C000029130 Class I CIK Series ID Class/Contract Name Acquiring: 0000277751 JANUS INVESTMENT FUND S000010490 Janus Enterprise Fund C000077740 Class R Target: 0001110822 JANUS ADVISER SERIES S000010558 Janus Adviser Mid Cap Growth Fund C000029131 Class R CIK Series ID Class/Contract Name Acquiring: 0000277751 JANUS INVESTMENT FUND S000010490 Janus Enterprise Fund C000077741 Class S Target: 0001110822 JANUS ADVISER SERIES S000010558 Janus Adviser Mid Cap Growth Fund C000029132 Class S