Itsuo Inouye/AP; Skye Gould/Insider This story is available exclusively to Insider subscribers. Become an Insider and start reading now. SoftBank has invested in more than 100 tech companies, creating a vast network of businesses. The Japanese investor wants the companies to work together, which makes them stronger as they grow – but could put them in danger if their peers fail. A review by Insider offers the first comprehensive accounting of vendor and partner relationships among the group of SoftBank portfolio companies. In the late 1990s, Masayoshi Son laid out a plan for hundreds of years of growth. Son's investment firm, SoftBank, could become the world's biggest investor and even "sustain sales for 300 years," he said in a recorded video from the time, in part because SoftBank would encourage its companies to work together.