| SC 13D/A | 2008-09-11 | Shamrock Activist Value Fund L P | MAGELLAN HEALTH SERVICES INC | 1,293,871 | 3.2% | EDGAR |
| SC 13G/A | 2008-09-08 | RS INVESTMENT MANAGEMENT CO LLC | MAGELLAN HEALTH SERVICES INC | - | 10.0% | EDGAR |
| SC 13D | 2008-03-18 | HealthCor Management, L.P. | MAGELLAN HEALTH SERVICES INC | 2,750,000 | 6.8% | EDGAR |
| SC 13D | 2008-03-14 | Shamrock Activist Value Fund L P | MAGELLAN HEALTH SERVICES INC | 1,786,743 | 4.4% | EDGAR |
| SC 13G | 2008-03-10 | D. E. Shaw Valence Portfolios, L.L.C. | MAGELLAN HEALTH SERVICES INC | 2,319,065 | 5.8% | EDGAR |
| SC 13G/A | 2008-02-14 | OZ MANAGEMENT LP | MAGELLAN HEALTH SERVICES INC | 1,228,126 | 3.1% | EDGAR |
| SC 13G/A | 2008-02-13 | HealthCor Management, L.P. | MAGELLAN HEALTH SERVICES INC | 2,100,000 | 5.3% | EDGAR |
| SC 13G/A | 2008-02-08 | RS INVESTMENT MANAGEMENT CO LLC | MAGELLAN HEALTH SERVICES INC | - | 7.7% | EDGAR |
| SC 13G | 2008-02-08 | BlackRock Inc. | MAGELLAN HEALTH SERVICES INC | 3,542,204 | 8.9% | EDGAR |
| SC 13G/A | 2008-01-31 | TimesSquare Capital Management, LLC | MAGELLAN HEALTH SERVICES INC | 3,317,667 | 8.3% | EDGAR |
| SC 13G | 2007-09-24 | OZ MANAGEMENT LP | MAGELLAN HEALTH SERVICES INC | 2,083,655 | 5.3% | EDGAR |
| SC 13G | 2007-08-06 | HealthCor Management, L.P. | MAGELLAN HEALTH SERVICES INC | 2,253,500 | 5.7% | EDGAR |
| SC 13G/A | 2007-02-14 | QUAKER CAPITAL MANAGEMENT CORP | MAGELLAN HEALTH SERVICES INC | 1,126,879 | 3.0% | EDGAR |
| SC 13G/A | 2007-02-09 | RS INVESTMENT MANAGEMENT CO LLC | MAGELLAN HEALTH SERVICES INC | - | 7.6% | EDGAR |
| SC 13G/A | 2007-02-09 | TimesSquare Capital Management, LLC | MAGELLAN HEALTH SERVICES INC | 2,686,467 | 7.1% | EDGAR |
| SC 13G | 2006-02-14 | AMERIPRISE FINANCIAL INC | MAGELLAN HEALTH SERVICES INC | 1,153,576 | 3.2% | EDGAR |
| SC 13G | 2006-02-14 | QUAKER CAPITAL MANAGEMENT CORP | MAGELLAN HEALTH SERVICES INC | 1,852,445 | 5.1% | EDGAR |
| SC 13G/A | 2006-02-10 | JANA PARTNERS LLC | MAGELLAN HEALTH SERVICES INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2006-02-10 | RS INVESTMENT MANAGEMENT CO LLC | MAGELLAN HEALTH SERVICES INC | - | 7.5% | EDGAR |
| SC 13G/A | 2006-02-10 | TimesSquare Capital Management, LLC | MAGELLAN HEALTH SERVICES INC | 2,360,067 | 6.5% | EDGAR |