London-based HgCapital is gearing up to collect £3 billion for its latest funds in just a few months, in the latest evidence of the booming backdrop for private equity fundraising.

HgCapital's eighth fund, which officially came to market in September targeting £2 billion, is already more than three times oversubscribed, according to people familiar with the matter. Investor interest for the fund is around £7.5 billion, one person added.