Spark upsizes proposed IPO

Spark Therapeutics Inc. (Philadelphia, Pa.) amended its IPO on NASDAQ and now plans to sell 6.5 million shares at $19-$21. At $20, Spark would raise $130 million and be valued at $459.8 million. Last week, the gene therapy company proposed to sell 5.5 million shares at $15-$17.

The company filed in December to raise up to $86.3 million. JPMorgan; Credit Suisse; Cowen; and Sanford C. Bernstein are underwriters. ...