Treasury Stock: Treasury stock refers to a company's own shares that have been repurchased and are being held by the company itself, rather than being outstanding in the hands of investors.
Share Repurchase: A share repurchase is the act of a company buying back its own shares from the marketplace, reducing the number of shares outstanding.
Shareholder Equity: Shareholder equity represents the net worth of a company, calculated as the difference between the company's total assets and its total liabilities. A buyback reduces the number of shares outstanding, thereby increasing the ownership stake of remaining shareholders.