Can you explain the factors that affect value of a firm's common stock?

• news releases on earnings and profits, and future estimated earnings
• announcement of dividends
• introduction of a new product or a product recall
• securing a new large contract
• employee layoffs
• anticipated takeover or merger
• a change of management

profitability, cashflows, taxation, gross margin, net profitability, no of  shares floating. dividends in terms of Gordon growth model. also the any event which impairs the earnings e.g accidents floods earthquakes and strikes.