This fourth round brings the total raised by the company to E389m.
Allianz Capital Partners, Round1’s chief executive and some private individuals have invested in this second round of financing.
The fund, which had an original target of £50m-£75m, will make investments in UK-based start-up and early-stage technology businesses.
The latest addition to Royal Bank of Scotland's private equity business will invest in enterprise application and communication software, internet infrastructure and hardware infrastructure.
The latest Initiative Europe focus report says that private capital is increasingly being raised for investment in European technology companies despite turbulence in the world’s public markets.