X0306 4 2017-02-13 0 0001080709 ARENA PHARMACEUTICALS INC ARNA 0001657494 Aurentz Vincent C/O ARENA PHARMACEUTICALS, INC. 6154 NANCY RIDGE DRIVE SAN DIEGO CA 92121 0 1 0 0 Executive VP and CBO Employee Stock Option (right to buy) 1.46 2017-02-13 4 A 0 995000 0.00 A 2024-02-13 Common Stock 995000 995000 D The options vest over four years, with 25% of the shares subject to the option vesting on February 13, 2018, and the remainder of the shares vesting monthly over the following three years in equal installments (except as otherwise necessary to avoid vesting of a fractional share), and are exercisable once vested. Steven W. Spector, as Attorney-in-Fact 2017-02-14