New York’s On Deck Capital said in a press release Thursday that it raised $4 million in follow-on funding. Five-year-old On Deck, a technology platform for connecting so-called Main Street businesses to capital, received $15 million in a series C round in January. On Deck evaluates the financial health of small businesses through data aggregation to help them assess their options for obtaining loans. The company’s new funding comes from private investment firm SF Capital Group and will go towards sales and marketing purposes. Neil Wolfson, president of SF Capital, will join On Deck’s board of directors in conjunction with the funding. Other investors in On Deck include SAP Ventures, Contour Venture Partners, First Round Capital, Khosla Ventures, RRE Ventures, and Village Ventures.