US securities regulators are poised to finalise long-awaited rules intended to prevent a repeat of the 2008 financial crisis, when an investor stampede out of money-market mutual funds threatened to freeze corporate lending, according to people familiar with the process.

The Securities and Exchange Commission is expected to vote on a plan as early as this month that would require certain money funds catering to large, institutional investors to abandon their fixed $1 share price and float in value like other mutual funds, these people said.