This is unsettling for the millions of people whose retirement savings sit in "set it and forget it" 401(k) funds they don't actively manage.

• BlackRock, which oversees $14 trillion, has quietly changed the formula inside common target-date retirement funds, the default choice for most 401(k) savers.
• Workers aged 45 to 60 are now being pushed into more stocks, on the argument that people live longer and need bigger growth — but it means more risk near retirement.
• Wall Street is also moving to add private equity, private credit, crypto, and data-center investments into 401(k)s, which carry higher fees and are harder to sell or value.
• A Trump executive order from August 2025 opened the door to these riskier "alternative" investments inside retirement accounts.
• The worry: savers don't choose these bets, don't see the hidden fees, and get stuck holding the risk if markets crash close to retirement.

Outlook: Expect private and higher-risk assets to keep spreading into ordinary retirement accounts, with savers bearing the downside if a downturn hits.