401(k) Defaults Tie Retirement Savings to Big Tech’s Growing Weight

More than 80% of 401(k)s default into target-date index funds, most of them cap-weighted, Fortune reported. That approach gives larger companies more weight as their market value grows, tying retirement savings to the biggest firms.

Federal Reserve figures cited in the article show 54% of U.S. households have a 401(k). Researcher Hera Hyeonseo Lee said funds automatically buy more of a company such as Nvidia as it takes up more space in the S&P 500. Ed Yardeni of Yardeni Research said the Magnificent Seven account for about 30% of the index’s market value.

The article also flags how accounting can make AI-related gains look like cash earnings. Lee said Amazon’s first-quarter net income was nearly $30 billion, including almost $17 billion from a valuation gain on its Anthropic investment. She said that gain was unrealized.

The concentration may leave retirement accounts exposed if major technology shares fall. UCLA finance professor Valentin Haddad described a possible sharp decline as an analogy, not a forecast, to the 2001 internet bust. He said Tesla can make up 3% to 4% of some portfolios.

For savers concerned about risk, Vanguard’s Jim Rowley said they can focus on their time horizon, risk tolerance, asset allocation and fund costs. The article also notes that equal-weight index funds, which give each company the same share, are available in many 401(k) plans.