What is a factor ETF?

Factor ETFs are designed to give targeted exposure to a factor that academic and practitioner research associates with long-run return or risk patterns, such as value, quality, momentum, or low volatility.

Factor investing can work over long horizons, but factors go through cycles. A factor ETF can underperform the broad market for years, even if the thesis remains intact.

If you use factor ETFs, set expectations and sizing appropriately. The real benefit often comes from diversified factor exposure and disciplined holding periods, not chasing whichever factor just worked.