Robert Greifeld is the former CEO and Chairman of Nasdaq, Inc. He is currently Chairman of Virtu Financial, a leading financial technology and trading firm, Managing Partner and Co-Founder at Cornerstone Investment Capital, a financial technology investment firm, and a Board Member at Capital Rock and Financeware.  Bob is Chairman and Founder of USATF Foundation, an organization dedicated to supporting both athletes from disadvantaged backgrounds and our next generation of Olympians. Bob also serves on the NYU Stern Board of Overseers. Five Good Questions: What do you think about the online brokerages now charging $0 for most trades? What does the shift from active to passive mean for exchanges? Are we losing the wisdom of the crowds which imbued information into market pricing? Could the market be doing a less effective job than before? You successfully executed dozens of acquisitions during your CEO tenure. What are the keys to good M&A and what are the risks Amazon went public at a $440m valuation. Google at $23B. Facebook at $104B. As companies delay going public for longer, is there concern for public equity investors that there won’t be enough growth left for them after a lofty IPO? You’ve interacted with countless high-profile CEOs. What was your most memorable moment with one of them? What do you consider to be the single most important factor that allowed you to be successful, and what as the single most important factor that limited your success?