(Bloomberg) -- The world’s biggest money managers are mapping out proposals intended to grease trading in debt markets that regulators warn are at risk of seizing up in the event of a sudden rush by investors to pull cash.

Pimco, BlackRock and Vanguard are among firms that have met in recent months to discuss potential fixes that they want to present to the U.S. Securities and Exchange Commission, according to Paul Jakubowski, Vanguard’s head of global credit.

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