The continued growth in ridership suggests Uber's core business has so far managed to handle a slew of scandals, including allegations of sexual harassment, a lawsuit alleging trade-secrets theft and a federal criminal probe over its use of software to evade city regulators. In addition, Benchmark, Uber's biggest investor, is embroiled in a board battle with the ride-sharing company's former CEO Travis Kalanick, filing a lawsuit to eliminate three board seats which were added when he still held the position. In addition, some investors are skeptical of Uber's $68-billion valuation, and four mutual fund investors disclosed this week that they had marked down the value of their Uber shares by as much as 15 percent. Uber has raised more than $15 billion from investors since 2010, allowing it to operate at a significant loss. The company said it has $6.6 billion in the bank, down from about $7.2 billion in the first quarter.