SVG Capital, the biggest investor in UK buyout firm Permira’s funds, has suffered a steeper decline in value across its portfolio than many of its direct private equity competitors, after experiencing a raft of writedowns in its investments, including an 80% hit on German media group ProSiebenSat.1.

In the six months to June, SVG’s net asset value – a benchmark of portfolio worth – fell by 12.3% to £1.1bn (1.4bn), or £8.47 per share.