Achaogen Inc. closed its underwritten public offering of 7,475,000 shares priced at $13.50 per share.

The shares sold include the full exercise of the underwriters' option to buy up to an additional 975,000 shares.

The offering generated gross proceeds of about $100.9 million, with net proceeds of about $94.5 million, less underwriting discounts and commissions and estimated offering expenses.

Leerink Partners LLC, Stifel and Guggenheim Securities LLC were joint book runners, while SunTrust Robinson Humphrey Inc. was the lead manager for the offering.