HarbourVest Global Private Equity, an early investor in Facebook, will start trading on the main section of the London Stock Exchange Wednesday, the latest attempt by a private equity firm to attract individual investors.

The publicly traded fund, which first sold shares in 2007 targeting institutional investors, is managed by Boston-based HarbourVest Partners, which has invested more than $25 billion in private equity and venture capital on behalf of pension funds and other institutions in the past three decades.