X0306 4 2019-11-13 0 0001080709 ARENA PHARMACEUTICALS INC ARNA 0001779614 Lisicki Robert C/O ARENA PHARMACEUTICALS, INC. 6154 NANCY RIDGE DRIVE SAN DIEGO CA 92121 0 1 0 0 EVP, Chief Commercial Officer Common Stock 2019-11-13 4 S 0 4429 45.8342 D 0 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.540 to $46.150, inclusive. The reporting person undertakes to provide Arena Pharmaceuticals, Inc., any security holder of Arena Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range. /s/ Robert Lisicki 2019-11-26