Informatica
, a public Redwood City company that provides data integration software, said it will acquire San Mateo’s Itemfield, a company that allows access to “unstructured and semi-structured data” for $55 million.

The deal provides a return to investors Accel Partners, Evergreen Partners, Foundation Capital, Gemini Israel Funds, which had pumped in at least $18.5 million into the Itemfield.