What companies merge approximately forty other companies to form a monopoly?

In various industries, large corporations have merged with or acquired numerous companies to gain significant market power, effectively forming a monopoly. Notable examples include tech giants like Amazon and google, which have acquired numerous startups and companies to dominate their respective markets. Additionally, companies like Comcast and AT&T in the telecommunications sector have merged with multiple entities to consolidate their influence. These practices raise regulatory concerns and scrutiny from antitrust authorities.