Inside the New York City offices of $45 billion hedge-fund firm Two Sigma

What do you picture when you imagine a hedge-fund office? A noisy trading floor full of hedge-fund guys in fleece vests?

Two Sigma, a $45 billion hedge-fund firm that uses advanced technologies to find investment opportunities, is a little different. The firm, which says it has seen head count grow by more than 400% in the past seven years, is as much a technology company as it is a finance company, analyzing over 10,000 data sources to find patterns in markets.

That approach seems to have paid off. Two Sigma ranked as the fifth-biggest hedge fund in the world in Institutional Investor's Alpha's 2017 Hedge Fund 100 list, while cofounders David Siegel and John Overdeck each made $750 million last year, according to the magazine's list of the top-earning hedge-fund managers. The firm also runs an insurance business, Two Sigma Insurance Quantified, a market-making arm called Two Sigma Securities, and a venture-capital arm.

In August, Business Insider took a tour of the firm's two New York offices, which are across the road from each other in the SoHo neighborhood. The offices are stashed with arcade games, computing memorabilia, gyms, a hacker space, and a music room.