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IEX, a start-up stock market dedicated to institutionalizing fairness through technology, and the subject of Michael Lewis’ book, Flash Boys, has signed a 7-year, 13,000 square foot lease at 4 World Trade Center. The company expects to move to the 44th floor of 4 World Trade Center in April 2015.

Lease negotiations for IEX were handled by a CBRE’s Rocco Laginestra and Rob Wizenberg. Jeremy Moss, Director of World Trade Center Leasing for Silverstein Properties, and Camille McGratty, Vice President of Leasing, led the negotiations for the landlord, together with the CBRE agency team including Steve Siegel, Mary Ann Tighe, Adam Foster, Steve Eynon, Evan Haskell, Ken Meyerson and David Caperna.

“We are inspired by the resilience and effort it takes to rebuild the World Trade Center, and we want to support the neighborhood as it continues to thrive and redefine itself,” said Brad Katsuyama, CEO and Co-Founder of IEX. “Like most start-ups, we initially signed short-term leases. But thanks to our recent growth and the support of an extraordinary group of investors, we were able to sign a long-term lease with Silverstein to establish IEX headquarters in downtown New York City. We launched IEX in Lower Manhattan, so this is our way of staying true to what got us here.”

According to the Downtown Alliance, 511 firms have moved to Lower Manhattan since 2005, leasing a total of 12.3 million square feet (1.14 million square meters). 226 of those companies have been in creative or professional services, taking 51 percent of the space leased.

Designed by Pritzker-prize winning architect Fumihiko Maki to meet a LEED Gold standard of sustainability, 4 WTC is a model of transparency and efficiency.

The 977 foot (298 meter) building contains 2.3 million square feet (213,680 square meters) of light-filled, green and high-tech office space spread over 56 office floors. In addition to IEX, other tenants in the building include MediaMath (106,000 square feet), Morningstar (30,000 square feet), the Port Authority of New York & New Jersey (600,000 square feet) and the City of New York (600,000 square feet).