Spark Therapeutics Inc. (NASDAQ: ONCE) filed an S-1 form with the U.S. Securities and Exchange Commission (SEC) for a secondary offering. The company is offering 2 million shares, short sellers are offering 1 million shares and there is an overallotment option for an additional 450,000 shares. At Monday’s closing price of $50.53, the entire offering is valued up to $174.3 million.

The underwriters for the offering are JPMorgan, Cowen, Evercore ISI, SunTrust Robinson Humphrey and Roth Capital partners.

Spark is a leader in the field of gene therapy, seeking to transform the lives of patients suffering from debilitating genetic diseases by developing one-time, life-altering treatments. The goal of gene therapy is to overcome the effects of a malfunctioning, disease-causing gene by delivering a normal, functional copy of the same gene. Its product candidates have the potential to provide long-lasting effects, dramatically and positively changing the lives of patients with conditions where no, or only palliative, therapies exist.

The initial focus is on treating orphan diseases, and Spark recently reported statistically significant results in a pivotal Phase 3 clinical trial of its first product candidate targeting rare genetic blinding conditions, which has received both breakthrough therapy and orphan product designation. Based on these positive results, the company intends to file a Biologics License Application (BLA) for this product candidate with the U.S. Food and Drug Administration (FDA) in 2016 as the first step in executing a global regulatory and commercialization strategy.

In the SEC filing the company said:

We also have built a pipeline of product candidates targeting multiple rare blinding conditions, hematologic disorders and neurodegenerative diseases. Our pipeline includes: a second product candidate targeting another rare genetic blinding condition currently in a Phase 1/2 clinical trial; product candidates for the treatment of hemophilia with a hemophilia B product candidate currently in a Phase 1/2 clinical trial in collaboration with Pfizer Inc. and a preclinical product candidate for hemophilia A; a product candidate for the treatment of a form of Batten disease, for which we expect to commence Investigational New Drug application, or IND, enabling studies by the end of 2015; and other ophthalmic, hematologic and neurodegenerative disease programs.

Spark was trading at $48.72 Tuesday morning, with a consensus analyst price target of $82.33 and a 52-week trading range of $36.96 to $79.50.

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