- 3i
- Advent International
- Apax
- Bank of Scotland
- Banque Paribas
- Bridgepoint Capital
- Change Capital
- CinVen
- Close Brothers
- CVC Capital Partners
- Duke Street Capital
- EBRD
- Electra Partners
| - Enterprise Ventures
- EQT
- European Capital
- Graphite Capital
- HSBC
- ISIS
- IRRfc
- L&G Ventures
- Lion Capital
- Lloyds TSB
- Oaktree Capital
- Turkven
- World Bank (IFC)
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