X0306 4 2014-09-30 0 0001267813 MARINUS PHARMACEUTICALS INC MRNS 0001242613 MAYLEBEN TIMOTHY M C/O MARINUS PHARMACEUTICALS, INC. 142 TEMPLE ST., SUITE 205 NEW HAVEN CT 06510 1 0 0 0 Stock option (right to buy) 6.47 2014-09-30 4 A 0 6000 0 A 2024-09-30 Common Stock 6000 6000 D Options to purchase 1,000 shares became exercisable on the date of grant and the remaining 5,000 shares become exercisable in ten installments of 500 shares each on the last day of each of the ten months succeeding the grant date. /s/ Edward Smith Attorney-in-Fact 2014-10-02