I'd guess a lot of them have voting rights-- Google has (I believe) stock options, an employee stock purchase plan, a 401(k)... Whether they'd be better off with voting rights and profit shares that they couldn't sell is another question.

(But corporations are, as a rule, a lot less paternalistic than they used to be when it comes to regulating employee lives. We see less of things like Henry Ford trying to ensure his employees' moral character-- and racial homogeneity-- by running Dearborn as a near-fief.)