How can a large company make a profit by acquiring other companies and becoming a major shareholder? Where does he make money?

Assuming that the big company is A and the acquired company is B, even if A becomes the major shareholder of B, the two companies are still independent legal persons. Company A's holding of shares in Company B is the same as ordinary people's holding of shares in Company B, which mainly depends on the appreciation of shares, that is, the stock price rises (the stock price is related to the operation and income of Company B, and also related to people's expectations of Company B, that is, the market thinks that Company B will be profitable in the future), and the other income is dividends, which is also related to the company's operating conditions. When a company makes money, it usually pays dividends, that is, the money earned by shareholders. However, whether Company B can choose to distribute dividends depends on the management of shareholders. If Company A holds the absolute equity of Company B, then the management of Company B is also selected by Company A. Because of the principle of one share and one vote, Company A can decide the management candidate of Company B, and the management selected by Company B must represent the interests of the major shareholders of Company A. In the long run, Company B can not be red, but use profits to invest and earn more money. In this way, the company will grow bigger and bigger, the stock price will rise and the equity income will be more. In other words, A can sell more shares of Company B in the stock market, and continue to hold shares to get more dividends.