John Tuttle, 35, heads the listings business for the New York Stock Exchange. Tuttle told Business Insider that the market for initial public offerings is primed for a strong second half of the year. He discussed the value proposition of listing on the exchange — something the media doesn't pay attention to — and rival IEX. John Tuttle has his pitch down. The 35-year-old head of global listings at the New York Stock Exchange — one of Wall Street's most iconic institutions — is in charge of attracting companies to go public on the exchange.