Private asset managers have been tantalized for years about the $29 trillion in Americans’ retirement accounts. Donald Trump just made it easier for them to get a slice.

It’s the biggest move yet by the Trump administration to bring private assets to defined-contribution accounts.

Millions of Americans saving for retirement through 401(k) accounts could have the option of putting their money in higher-risk private equity and cryptocurrency investments, according to an executive order signed Thursday by President Donald Trump that could give those financial players long-sought access to a pool of funds worth