The deal values YSC at £38m. Founded in 1990, the company has since spread to New York, Mumbai and 12 other international offices providing business consultancy services.
YSC will be led by a new leadership team of Paul Ballman, Andy Houghton and Robert Sharrock, following the investment.
Gurnek Bains and Ken Rowe, who have led YSC since 1991, will become chairman and vice chairman respectively.
Liz Jones and Rupinder Cheema led the deal on behalf of ISIS, and were advised by Richard Holden and Mark Humphries from Catalyst Corporate Finance.
Jones said, “We have developed our relationship with YSC over the past 5 years, attracted by its market leading position, blue-chip client base and the calibre of its global people.
“Now the time is right, we are delighted to support its leadership transition and to partner with such an exceptional organisation.”
Last month mid-market focused ISIS backed a management buyout of UK recruitment group Armstrong Craven with a £3.5m investment.
The deal, led by Armstrong Craven’s founder Sue Craven and Matthew Mellor CEO with Rachel Davis COO, will establish the business as a separate company from its former parent company Work Group.
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