(Adds Brooks Brothers) Nov 22 (Reuters) - U.S. companies are reeling from several high-profile data breaches that have exposed millions of consumers' sensitive personal information, leading to regulatory probes and prompting the companies to invest heavily to secure their networks. These include a massive data breach at credit reporting firm Equifax Inc announced in September and Yahoo in October tripling its earlier estimate of a 2013 hack to include all its 3 billion accounts. Fo