Byron Trott, the former Goldman Sachs banker and frequent financial adviser to Warren Buffett, has raised more than $2bn in capital for his fledging investment firm.

The early fundraising successes come as many of the biggest private equity firms struggle to lure as much investment capital as planned, and highlight the cachet that has accompanied Mr Trott's role as Mr Buffett's favourite investment banker.

BDT Capital Partners, the venture Mr Trott founded earlier this year to invest in and advise family-run and entrepreneurial businesses, continues to seek additional commitments, people familiar with the matter said. The firm has also begun to add senior dealmakers, including Don McLellan, former head of mergers and acquisitions at Motorola, the people said.