Sacca brought in Matt Mazzeo to Lowercase Capital as a partner in 2013, with Mazzeo heading a new early-stage fund, Lowercase Stampede, out of Los Angeles. Mazzeo had worked at Creative Artists Agency (CAA), an entertainment and Sports agency. Sacca had a 4% stake in Uber by March 2015, and Lowercase was "sitting on" Investments in Stripe, Lookout and WordPress parent Automattic. Forbes estimated that Sacca was personally worth $1.2 billion. By that time the value of his first Twitter fund, Lowercase Industry, had reached 1,500% of its original value, and his Twitter deals overall had "returned $5 billion to Investors." Also in 2015, Forbes said that Sacca had built "the best seed portfolio in history" with funds such as his Lowercase Ventures Fund I, which had Investments in companies such as Twitter, Instagram, and Uber. Fortune had also labeled Lowercase as one of the most successful venture capital funds in history.