X0304 4 2012-03-09 0 0000714603 DST SYSTEMS INC DST 0001034466 MCDONNELL THOMAS A 333 WEST 11TH STREET KANSAS CITY MO 64105 1 1 0 0 Chief Executive Officer Common Stock 2012-03-09 4 F 0 470 54.07 D 830801 D This number is an aggregate of the number of shares of Issuer common stock that were withheld from the restricted stock units in order to satisfy the Reporting Person's tax withholding obligation. The withholding of shares ("Allowable Transactions") occurred in accordance with procedures of the Compensation Committee of the Issuer's Board of Directors, which approved the Reporting Person's Allowable Transactions at the time it granted the RSUs to him. Randall D. Young for Thomas A. McDonnell by power of attorney 2012-03-13