Ad marketplace filed for a $60 million IPO in February. But now the company has taken another $15 million from Hercules Technology Growth Capital, a Palo Alto-based firm that feeds both VC and private equity-backed companies.

Hercules lumped in Reply with a list of nine new or renewed investments totaling $111 million. Other fundees include mobile rich media platform IntelePeer, Propel Biofuels, and smart-grid company Trilliant.

Hercules runs a low-profile operation compared to, say, Elevation Partners. But the company, founded in 2003, is traded on the Nasdaq and, as noted in the Hercules’ press release, still has more money looking for a good home.