We used to work together montelukast sod 10 mg tablet coupon Co-founder and former CEO Evan Williams is Twitter's largestshareholder, with 12 percent of the shares, while co-founder andchairman Jack Dorsey owns 4.9 percent. Biz Williams, anotherco-founder, does not appear on the list of top shareholders.Current CEO Costolo owns 1.6 percent.