Sometimes, though, you'll need to calculate the number of shares the company holds as treasury stock. To do so, look at the common stock line of the balance sheet. Typically, that line will indicate how many shares the company has authorized and how many it has actually issued. If it doesn't say how many shares were issued, then you can divide the entry in that line by the par value of the stock to get the number of issued shares. For instance, if the stock has a $1 par value per share and the line item indicates $30,000 for common stock, then 30,000 shares are currently issued.
Once you know the number of shares issued, the total treasury shares are calculated by subtracting the shares issued from the total shares outstanding. You can typically get a count of outstanding shares from the income statement. So if 60,000 shares are outstanding but only 50,000 are issued, then the remaining 10,000 are treasury shares.
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