X0204 3 2011-10-27 0 0000019411 MAGELLAN HEALTH SERVICES INC MGLN 0001343781 HealthCor Management, L.P. 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001409305 HealthCor Associates, LLC 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001454850 HealthCor Hybrid Offshore Master Fund, L.P. 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001454852 HealthCor Offshore GP, LLC 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001409307 HealthCor Group, LLC 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001409308 HealthCor Capital, L.P. 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001337961 HEALTHCOR L P 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001454853 HealthCor Offshore Master Fund, L.P. 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 0001454849 HealthCor Hybrid Offshore GP, LLC 152 W. 57TH STREET, 43RD FLOOR NEW YORK NY 10019 0 0 1 0 Common Stock, $0.001 par value per share 3000000 I See Footnote HealthCor Management, L.P. is the investment manager of Healthcor, L.P., HealthCor Offshore Master Fund, L.P., and HealthCor Hybrid Offshore Master Fund, L.P., which are the direct beneficial owners of the securities reported herein. The general partner of HealthCor, L.P. is Healthcor Capital, L.P. and the general partner of HealthCor Capital, L.P. is HealthCor Group, LLC. The general partner of Healthcor Offshore Master Fund, L.P. is HealthCor Offshore GP, LLC. The general partner of HealthCor Hybrid Offshore Master Fund, L.P. is HealthCor Hybrid Offshore GP, LLC. HealthCor Group, LLC is the general partner of HealthCor Offshore GP, LLC and HealthCor Hybrid Offshore GP, LLC. HealthCor Associates, LLC is the general partner of HealthCor Management, L.P. and Arthur Cohen and Joseph Healey are the managers of HealthCor Associates, LLC. Each of the Reporting persons disclaim beneficial ownership of any and all such securities in excess of its or their own actual pecuniary interest. HealthCor Management, L.P. is the designated filer on behalf of the reporting persons listed on Exhibit 99.1, attached hereto. Due to the number of reporting persons, this is one of two Form 3's filed relating to the same securities. HealthCor Management, L.P., by HealthCor Associates, LLC, its general partner, By: /s/ John H. Coghlin , General Counsel 2011-10-31 HealthCor Associates, LLC, By: /s/ John H. Coghlin, General Counsel 2011-10-31 HealthCor Hybrid Offshore GP, LLC, for itself and as general partner on behalf of HealthCor Hybrid Offshore Master Fund, L.P., by HealthCor Group, LLC, its general partner, By: /s/ John H. Coghlin , General Counsel 2011-10-31 HealthCor Offshore GP, LLC, for itself and as general partner of on behalf of HealthCor Offshore Master Fund, L.P., by HealthCor Group, LLC, its general partner, By: /s/ John H. Coghlin , General Counsel 2011-10-31 HealthCor Group, LLC, By: /s/ John H. Coghlin, General Counsel 2011-10-31 HealthCor Capital L.P., for itself and as manager on behalf of HealthCor L.P., by HealthCor Group, LLC, its general partner, By: /s/ John H. Coghlin, General Counsel 2011-10-31