Buyback yield is the percentage of the amount spent by a company to repurchase its own shares to its market capitalization.
Change in capital stock / Market capitalization * 100%
A high Buyback yield may indicate that a stock is undervalued or actively repurchasing its shares. Some investors view Buyback yield as an attractive investment thesis because the company is potentially buying back shares to support the stock price and its shareholders. In rare cases, a high Buyback yield may also indicate that a company is trying to buy back the bulk of shares in order to avoid an enemy takeover.