The largest stake in Twitter Inc. first came together seven years ago at a posh Caribbean resort.
On Necker Island, a retreat owned by billionaire Richard Branson, Suhail R. Rizvi, a little-known but well-connected financier, met Chris Sacca, a brash, young Google Inc. executive.
Their friendship would later form the foundation of a 15.6% stake in Twitter managed by Mr. Rizvi’s investment firm, Rizvi Traverse Management LLC….