Shares of e-commerce outfit (NYSE: W) ended Thursday's trading session down 9.9%, driven lower by several insiders' decision to dump shares as soon as they became available to sell.

Most senior managers of publicly traded companies receive company stock and/or stock options -- the right to buy shares at a pre-determined price in the future -- as part of their net compensation. It's not unusual for these executives to regularly sell some of these shares shortly after they're allowed to do so.

It is a bit of a red flag, however, to see several top executives shed a huge number of shares all at the same time and as soon as these shares became available to sell.

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Source Fool.com