The firm is offering 24.6 million shares of its common stock and warrants to purchase 24.6 million shares of stocks to financially support and expand its business.
The Australian company also plans to offer 72 million new shares to eligible existing shareholders to raise additional funds.
The Tucson, Arizona-based company previously raised $20 million through a public offering of its shares and a purchase deal with certain investors.
The genetic testing firm is offering approximately 2.3 million shares at $11.25 per share and plans to use the funds for general corporate purposes.
The company said it intends to use the proceeds of the offering to advance its MosaiQ high-throughput automated testing products, among other things.
The company said it will use the net proceeds for general corporate purposes and to fund ongoing operations and expansion of its business.
Of the 29 companies in the index, 18 companies' share prices declined while the share values of 11 increased month over month.
The company priced the offering at $1.50 per share and said it will use some of the proceeds to fund research, development, and commercialization of its portfolio.
OpGen said it intends to use the proceeds of the offering to complete its acquisition of German molecular diagnostics firm Curetis, among other things.
If the underwriters exercise their option to purchase the over-allotment in full, total gross proceeds from the offering would be $230 million.