The eye-popping $4.8 billion sticker price on Spark Therapeutics’acquisition deal with Roche announced on Monday is shaping up to be the largest exit ever within city limits for a venture-backed company, according to data from financial data provider PitchBook and the Philadelphia Alliance for Capital and Technologies (PACT).

“Filtering down to just Philadelphia proper does reveal that Spark Therapeutics, once the deal closes, will be the biggest exit ever for Philly-based venture-backed exits,” the company said in an email, citing data from an upcoming report.

According to the Seattle-based company’s data, the current holder of the largest Philly-proper exit title goes to Avid Radiopharmaceuticals, which in 2010 announced its acquisition by Lilly in a deal valued at up to $800 million.

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