DGCL Sec. 151 - Classes and Series of Stock

A corporation may issue shares in more than one class, with each class having separate rights and powers.  For examplee, a board can use §151 to issue shares with variable voting rights. Along those lines Facebook, Google, Twitter and other tech firms have used §151 to issue shares classes of stock to founders with 10 votes per share. Stock issued to the public have 1 vote per share, or in some cases, no votes at all. 

Shares issued by the corporation, may also be subject to redemption should that right be stipulated in the certificate of incorporation or the certificate of designation. In a redemption, the board may at any time make a “call” on the stock and can redeem the stock for a price determined in the certificate. A redemption differs from a stock repurchase in the a number of ways: First, a stock repurchase involves a decision by the stockholder to sell their stock. Absent consent of the stockholder, no one can force a stockholder to sell into a stock repurchase. A redemption can lack a certain degree of voluntariness. Stockholders take the stock knowing that the board has the power to redeem stock against the will of stockholders. Second, the stock repurchase can be done at any price. Presumably, the board will want a sufficient number of stockholders to voluntarily tender their shares, consequently the repurchase is typically done a premium to the market price. In a redemption, the redemption price, or at least a formula to calculate the price is set in the certificate of incorporation.