X0306 4 2013-01-31 false 0001284812 COHEN & STEERS INC CNS 0001181496 COHEN MARTIN 280 PARK AVENUE, 10TH FLOOR NEW YORK NY 10017 true true true false Co-Chairman, Co-ChiefExecutive Common Stock 1340701 I By the Martin Cohen 1998 Family Trust Common Stock 2013-01-31 4 A false 54520 0 A 10564429 D Shares held by the Martin Cohen 1998 Family Trust for the benefit of Mr. Cohens family. Mr. Cohens spouse is the trustee of the trust. Mr. Cohen disclaims beneficial ownership of these shares, and the filing of this report is not an admission that Mr. Cohen is the beneficial owner of these shares for the purposes of Section 16 and for any other purpose. Includes 40,890 restricted stock units (RSUs) mandatorily deferred by CNS from the reporting persons annual incentive performance bonus. Dividends paid on CNS common stock are reflected in additional RSUs on such deferred RSUs. The deferred RSUs vest ratably over four years, and the dividend RSUs vest on the fourth anniversary of the grant. Also includes 13,630 RSUs that generally vest over four years. Salvatore Rappa, Attorney-in-Fact 2013-02-01