Как правильно перевести sponsoring broker

Речь идет о том, чтобы акции компании стали котироваться на рыке некотируемых ценных бумаг при Лондонской фондовой бирже.
Контекст:

A number of steps are required to be taken for Majestic plc to gain USM status:
1. Review of current position. Before going further, the company needs to be sure that it has the appropriate management team, particularly that the financial expertise is available to meet the demands of being a public company.
2. Appoint a professional team to take the company to the USM. Typically, this involves a sponsoring broker, solicitor and accountant.
Заранее признателен.