Williams was part of the Old Mutual team that acquired Skandia UK in 2006.
In a previous role as CEO of Cofunds, he grew assets under administration from £13bn to £27bn in 18 months.
As well as his role at Kuber, Williams will continue as managing partner of recently launched alternative investments company Old Burlington Investments, which has an initial focus on EIS.
Kuber is backed by Williams’ private equity firm LW², which is also co-owned by Neil Lewis, Tim West and Tim Levy.
The firm was established in 2011 to back innovative businesses in the alternative investment market.
Kuber was launched in 2012 to offer advisers simple access to the Enterprise Investment Scheme, which the firm says has become a greater focus for investors on the back of lacklustre returns in the mainstream funds market.
The EIS is designed to help smaller higher-risk trading companies to raise finance by offering tax relief to investors purchasing shares in the businesses.
Kuber says it reduces administration by streamlining the EIS application process, giving advisers access to consolidated performance and tax reporting to facilitate more meaningful communication with clients.
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