Leading the new investors are Goldman Sachs, The McGraw-Hill Companies and SAP Ventures. There has also been re-investment by Bessemer Venture Partners.
The multimillion-pound financial boost is in addition to the $53m funding the site secured from a group led by Bain Capital Ventures in June.
Standard LinkedIn accounts are free, so the site's main revenue is generated by advertising, although it has also been developing premium subscriptions and corporate offerings.
Doug Higgins, partner at investor SAP Ventures, said: "We made this investment because we believe that when Web 2.0 technologies are thoughtfully applied to the enterprise, they can produce significant efficiencies for small, medium and large companies."
More than 30 million professionals have joined LinkedIn since its launch in December 2002. Its simple format enables business people to access people, jobs and other work opportunities online through its model of trusted connections and relationships.
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