The £10m fund, run by the SIB on behalf of the Office for Civil Society, provides grants of up to £150,000 to organisations aiming to raise at least £500,000 in investment or win contracts worth at least £1m.
In order to be eligible for a grant, a charity or social enterprise must work in partnership with one of the approved providers, which offer help and advice on making applications to the fund.
At the time the fund was launched, four providers were available to work with: ClearlySo, Locality, Resonance and Social Finance. Twelve new organisations have been added to the list, including the chief executives body Acevo, the business support firm PwC, the social bank Triodos and the Impetus Trust, which provides grants and business support for charities and social enterprises.
Jonathan Jenkins, chief executive of the SIB, said: "One of the main things we are trying to achieve through this fund is to raise the quality of investment readiness support. Having this increasingly strong marketplace of approved providers will really help to achieve that."
The full list of providers: