Salesforce brings in billions of dollars in revenue each year from its subscription software subscriptions. But the $105 billion cloud company is also a big tech investor, especially when it comes to pouring money into other public companies that sell software to businesses. And those investments add up. As of April, Salesforce owned $1.02 billion of equity in other companies, according to a company filing. In a separate filing, published Monday, Salesforce revealed the size and scope of its biggest holdings.