US regulators are set to propose expansive new requirements for private investment funds as part of a widening effort to police a fast-growing but relatively opaque corner of the capital markets.

In a meeting on 9 February, the Securities and Exchange Commission plans to vote on a proposal that would force hedge funds and private-equity funds to provide basic disclosures to their investors and guard against conflicts. If the proposal passes the Democrat-controlled commission, the agency will seek public comments for at least two months before issuing a final rule.