NEW YORK (TheStreet) -- Twitter (TWTR) COO Ali Rowghani will be resigning his position at the company, according to a regulatory filing on Thursday.
Rowghani will remain with the company as an adviser to CEO Dick Costolo.
U.S. stocks fluctuated as a post-earnings rally in Twitter shares faded.
Stocks move mostly lower on Thursday as a spike in Treasury yields makes defensive names from the utilities and materials sectors less favorable.
O'Shares Investments Chairman and CNBC's Shark Tank investor Kevin O'Leary thinks Twitter (TWTR) stock will drop to $12 per share.