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Stock which is bought back by the issuing company

A treasury stock or reacquired stock is stock which is bought back by the issuing company, reducing the amount of outstanding stock on the open market ("open market" including insiders' holdings). Stock repurchases are used as a tax efficient method to put cash into shareholders' hands, rather than paying dividends, in jurisdictions that treat capital gains more favorably. Sometimes, companies repurchase their stock when they feel that it is undervalued on the open market. Other times, companies repurchase their stock to reduce dilution from incentive compensation plans for employees. Another reason for stock repurchase is to protect the company against a takeover threat. The United Kingdom equivalent of treasury stock as used in the United States is treasury share. Treasury stocks in the UK refers to government bonds or gilts.

In an efficient market, a company buying back its stock should have no effect on its price per share valuation. If the market fairly prices a company's shares at $50/share, and the company buys back 100 shares for $5,000, it now has $5,000 less cash but there are 100 fewer shares outstanding; the net effect should be that the underlying value of each share is unchanged. Additionally, buying back shares will improve price/earnings ratios due to the reduced number of shares (and unchanged earnings) and improve earnings per share ratios due to fewer shares outstanding (and unchanged earnings). If the market is not efficient, the company's shares may be underpriced. In that case a company can benefit its other shareholders by buying back shares. If a company's shares are overpriced, then a company is actually hurting its remaining shareholders by buying back stock.

One other reason for a company to buy back its own stock is to reward holders of stock options. Call option holders are hurt by dividend payments, since, typically, they are not eligible to receive them. A share buyback program may increase the value of remaining shares (if the buyback is executed when shares are under priced); if so, call option holders benefit. A dividend payment short term always decreases the value of shares after the payment, so, for stocks with regularly scheduled dividends, on the day shares go ex dividend, call option holders always lose whereas put option holders benefit. This does not apply to unscheduled (special) dividends since the strike prices of options are typically adjusted to reflect the amount of the special dividend. Finally, if the sellers into a corporate buyback are actually the call option holders themselves, they may directly benefit from temporary unrealistically favorable pricing.

The company can either retire (cancel) the shares (however, retired shares are not listed as treasury stock on the company's financial statements) or hold the shares for later resale. Buying back stock reduces the number of outstanding shares. Accompanying the decrease in the number of shares outstanding is a reduction in company assets, in particular, cash assets, which are used to buy back shares.

On the balance sheet, treasury stock is listed under shareholders' equity as a negative number. It is commonly called "treasury stock" or "equity reduction". That is, treasury stock is a contra account to shareholders' equity. One way of accounting for treasury stock is with the cost method. In this method, the paid in capital account is reduced in the balance sheet when the treasury stock is bought. When the treasury stock is sold back on the open market, the paid in capital is either debited or credited if it is sold for less or more than the initial cost respectively. Another common way for accounting for treasury stock is the par value method. In the par value method, when the stock is purchased back from the market, the books will reflect the action as a retirement of the shares. Therefore, common stock is debited and treasury stock is credited. However, when the treasury stock is resold back to the market the entry in the books will be the same as the cost method. In either method, any transaction involving treasury stock cannot increase the amount of retained earnings. If the treasury stock is sold for more than cost, then the paid in capital treasury stock is the account that is increased, not retained earnings. In auditing financial statements, it is a common practice to check for this error to detect possible attempts to "cook the books".

In the United States, buybacks are covered by multiple laws under the auspices of the Securities and Exchange Commission.

In the UK, the Companies Act 1955 disallowed companies from holding their own shares. However, the Companies Act 1985 later repealed this.