X0203 3 2011-03-15 0 0001080709 ARENA PHARMACEUTICALS INC ARNA 0001514346 Bielasz Jennifer Kathleen C/O ARENA PHARMACEUTICALS, INC. 6166 NANCY RIDGE DRIVE SAN DIEGO CA 92121 0 1 0 0 Sr. Dir. of Accounting & Cont. Common Stock 7666 D Employee Stock Option (right to buy) 12.25 2012-01-15 Common Stock 2500 D Employee Stock Option (right to buy) 11.31 2012-07-19 Common Stock 5000 D Employee Stock Option (right to buy) 6.00 2014-01-18 Common Stock 5000 D Employee Stock Option (right to buy) 4.41 2014-10-08 Common Stock 2500 D Employee Stock Option (right to buy) 6.16 2015-01-17 Common Stock 4500 D Employee Stock Option (right to buy) 16.80 2016-01-20 Common Stock 3000 D Employee Stock Option (right to buy) 10.52 2016-07-28 Common Stock 4000 D Employee Stock Option (right to buy) 13.50 2017-02-26 Common Stock 6500 D Employee Stock Option (right to buy) 6.99 2018-03-03 Common Stock 6000 D Employee Stock Option (right to buy) 4.01 2019-03-17 Common Stock 6000 D Employee Stock Option (right to buy) 3.25 2020-03-17 Common Stock 9000 D The options vested in four equal annual installments beginning on January 15, 2003. The options vested in four equal annual installments beginning on July 19, 2003. The options vested in four equal annual installments beginning on June 1, 2004. The options vested in four equal annual installments beginning on October 8, 2005. The options were originally for 6,000 shares of common stock, and they vested in four equal annual installments beginning on June 1, 2005. The holder exercised options to purchase 1,500 shares of common stock. The options vested in four equal annual installments beginning on January 20, 2007. The options vested in four equal annual installments beginning on July 28, 2007 The options vested in four equal annual installments beginning on February 26, 2008. The options vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on March 3, 2009, the second installment became exercisable on March 3, 2010, the third installment became exercisable on March 3, 2011, and the fourth installment vests on March 3, 2012. The options vest in four equal annual installments, and are exercisable once vested. The first installment became exercisable on March 17, 2010, the second installment vests on March 17, 2011, the third installment vests on March 17, 2012, and the fourth installment vests on March 17, 2013. The options vest in four equal annual installments beginning on March 17, 2011, and are exercisable once vested. Adam S. Chinnock, as Attorney-in-Fact 2011-03-17