10 things to know about target-date funds

Concentration is increasing

The 10 largest TDF providers control more than 90% of the assets. To be exact, only 7.7% of assets are held by firms outside the top 10.

The top five — Vanguard Group, Fidelity Investments, T. Rowe Price, BlackRock Inc. and American Funds — have the lion’s share, with 78%. And that share is growing — it’s up 1.5 percentage points in three years.

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