There are some notable cases in history where company insiders participated in pushing up stock prices. Here are some of the more well-known cases and their specific operation methods: 1. **Enron incident**: Enron was exposed for accounting fraud around 2000. Internal executives used false financial data to push up stock prices and attract investors to buy. Insiders also profited by selling stocks when the company's financial situation was false. Specific methods included using complex financial instruments and special purpose entities to hide debt. 2. **Tom Petters case**: Pearson caused the company's stock price to soar by operating fake investment projects. He exaggerated the company's earnings and assets to create a false impression to attract investors. Executives used these false reports to buy and sell stocks. 3. **Martha Stewart case**: Although this case was not entirely about insiders pushing up stock prices, it also involved insider information trading. Martha Stewart was investigated for selling her ImClone shares, which were sold based on knowledge of non-public information about the company. This behavior also indirectly affected the stock price. Specific manipulation methods include: - **Making false financial reports**: Insiders beautify the company's financial situation by manipulating accounts, exaggerating income or concealing debts. - **Insider trading**: Executives or company staff buy and sell stocks with non-public information and take advantage of information asymmetry to make profits. - **Publishing positive news**: Using media and investor relations methods to publish positive company news or forecasts to enhance market confidence in the company. - **Stock buyback**: Company insiders may use stock buybacks to push up stock prices and give the market a positive signal. These actions are usually illegal and once discovered, they will have serious legal consequences for the relevant individuals and companies. Regulators will crack down on related insider trading and market manipulation.