X0303 4 2010-03-17 0 0001041858 RCN CORP /DE/ RCNI 0001259746 AQUINO PETER D C/O RCN CORP 196 VAN BUREN STREET SUITE 300 HERNDON VA 20170 1 1 0 0 President & CEO Common Stock 2010-03-17 4 D 0 3815 0 D 812619 D On August 20, 2009 the reporting person was granted Restricted Stock Units ("RSU's") pursuant to the RCN Stock Compensation Plan. The RSU's are subject to adjustment based on pre-determined financial performance criteria for fiscal year 2009 established by RCN's Board of Directors, and will vest in three equal amounts on June 10, 2010, June 10, 2011 and June 10, 2012. The above represents RSU's forfeited in relation to 2009 performance criteria. Jessica Kaman as Power of Attorney for Peter D. Aquino 2010-03-19