X0306 4 2013-03-01 0 0001228627 REXAHN PHARMACEUTICALS, INC. RNN 0001316420 Ahn Chang Ho C/O REXAHN PHARMACEUTICALS, INC. 15245 SHADY GROVE ROAD, SUITE 455 ROCKVILLE MD 20850 1 0 0 0 Common Stock 6813924 D Common Stock 500000 I By spouse Stock Option (right to purchase) 0.31 2013-03-01 4 A 0 250000 0 A 2023-03-01 Common Stock 250000 250000 D Stock Option (right to purchase) 0.78 2018-12-11 Common Stock 500000 500000 D Stock Option (right to purchase) 0.80 2015-01-20 Common Stock 1000000 1000000 D Options will vest and be exercisable based on the following schedule: 75,000 on March 1, 2014, 75,000 on March 1, 2015, and 100,000 on March 1, 2016. Options vested and became exercisable based on the following schedule 150,000 on December 11, 2009, 150,000 on December 11, 2010, and 200,000 on December 11, 2011. Options vested and became exercisable based on the following schedule 300,000 on January 20, 2006, 300,000 on January 20, 2007, and 400,000 on January 20, 2008. /s/ Tae Heum Jeong, as attorney -in-fact for Chang H. Ahn 2013-03-05