8.64B They only authorized 10 billion more but they are not outstanding as of yet.
"Authorized Shares Authorized shares refer to the largest number of shares that a single corporation can issue. The number of authorized shares per company is assessed at the company's creation and can only be increased and decreased through a vote by the shareholders. If at the time of incorporation the documents state that 100 shares are authorized, then only 100 shares can be issued.
Now just because a company can issue a certain number of shares doesn't mean that it is going to issue all of these shares to the public. Typically, companies will, for many reasons, keep a portion of the shares in their own treasury. For example, CTC may decide to maintain a controlling interest within the treasury just to ward off any hostile takeover bids. On the other hand, the company may have shares handy just in case it wants to sell them for excess cash (rather than borrowing). This tendency of a company to reserve some of its authorized shares leads us to the next important and related term: outstanding shares.
Outstanding Shares Not to be confused with authorized shares, outstanding shares refer to the number of stocks that a company actually has issued. This number represents all the shares that can be bought and sold by the public as well as all the restricted shares that require special permission before being transacted. As we already explained, shares that can be freely bought and sold by public investors are called the float, and this value changes depending on if the company wishes to repurchase shares from the market or sell out more of its authorized shares within its treasury."
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