Nasdaq will expand its presence in Philadelphia by investing $6.2 million into operations in its University City office and pledging to add 100 new jobs over the next three years. The $6.2 million investment will be used to support a "long-term" lease extension at the Nasdaq PHLX office inside the FMC Tower at 2929 Walnut St. and to update trading technology and infrastructure. The Philadelphia Stock Exchange, the oldest securities exchange in the country, was acquired by Nasdaq for $652 million in 2007. Representatives with Nasdaq declined to comment about the length of the lease extension. "Investments like this demonstrate that our economic development strategy is working and reinforce why Pennsylvania is one of the best places in the nation to start, grow and expand a business."