Santa Clara, CA-based Shape Security, providers of a platform for bot and online fraud mitigation, has raised $51 million.

The investment was led by C5 Capital, with existing investors Kleiner Perkins, HPE Growth, Norwest Ventures Partners, Focus Ventures, JetBlue Technology Ventures, Top Tier Capital Partners, and EPIC Ventures also participating in the round.

Shape Security has raised $183 million to date, with a pre-money valuation of $1 billion the company said in a statement.

[Image courtesy: Shape Security]