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What's the difference between shares outstanding and regular shares?
outstanding shares are the shares(regular shares) that are still tradable in the market, where the firm in question is listed. The term is primarily used to distinguish from shares held in treasury(treasury stock), which have been bought back(buybacks) from the market and aren't currently tradable in the market. Wikipedia is a bit more clearer and mentions the diluted outstanding shares(used for convertible bonds, warrants, etc) which is used to calculated diluted EPS.