In the USA, corporations just do stock splits or run a corporate vote to issue more shares. Also many large tech companies use stock as total compensation for employees, so the "selling" of stock can be indirect as a form of revenue. Instead of paying employees cash, they pay in stock, which frees up more cash for other things. Thus they don't need to have as high of true revenue margins to pay employees well. Big corporations understand that a lot of paper value is fungible one way or another.