X0206 3 2017-06-15 0 0000744218 Celldex Therapeutics, Inc. CLDX 0001709113 Cavanaugh Sarah C/O CELLDEX THERAPEUTICS, INC. 53 FRONTAGE ROAD, SUITE 220 HAMPTON NJ 08827 0 1 0 0 SVP of Corp. Affairs & Admin. Common Stock, par value $0.001 per share 4760 D Employee Stock Option (right to buy) 4.71 2022-08-15 Common Stock 7500 D Employee Stock Option (right to buy) 16.36 2023-07-01 Common Stock 20000 D Employee Stock Option (right to buy) 13.45 2024-06-04 Common Stock 25000 D Employee Stock Option (right to buy) 25.41 2025-06-10 Common Stock 30000 D Employee Stock Option (right to buy) 4.72 2026-06-08 Common Stock 22000 D The option became exercisable as to 25% of the shares on 8/15/2013 and the remaining shares vested quarterly (in equal amounts) over the subsequent 12 quarters. This option is currently fully vested. The option became exercisable as to 25% of the shares on 7/1/2014 and the remaining shares vested quarterly (in equal amounts) over the subsequent 12 quarters. The option became exercisable as to 25% of the shares on 6/4/2015 and the remaining shares vested quarterly (in equal amounts) over the subsequent 12 quarters. The option became exercisable as to 25% of the shares on 6/10/2016 and the remaining shares vested quarterly (in equal amounts) over the subsequent 12 quarters. The option became exercisable as to 25% of the shares on 6/8/2017 and the remaining shares vest quarterly (in equal amounts) over the subsequent 12 quarters. /s/ Sam Martin, attorney-in-fact for Sarah Cavanaugh 2017-06-16