 WW International Inc. WW, 4.36 shares tanked nearly 20 in the extended session Tuesday after the company formerly known as Weight Watchers reported second-quarter sales below Wall Street expectations and said it ended the quarter with fewer members than it had expected. WW said it earned 8.9 million, or 12 cents a share, in the quarter, compared with 14 million, or 20 cents a share, in the year-ago quarter. 