Split Rock Partners, a venture capital firm based in Minneapolis with offices in Menlo Park, Calif., has raised a $300 million second fund for investment in healthcare, software and Internet companies.

Split Rock first raised funds in 2005, picking up $275 for its inaugural fund. It reports that all investors in that fund returned for the second. The fund invests does early stage investment, and has put money into companies incuding Atritech, Evalve, Gearworks, HireRight, and LowerMyBills.com

Michael Gorman, Jim Simons, Dave Stassen and Allan Will are the fund’s managing directors. Along with the new raise, Josh Baltzell was also promoted to managing director.

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