What is Factor Investing?
Building or analyzing a portfolio around broad return drivers — like value, size, momentum and quality — rather than individual stock stories.
Educational — not investment advice
Decades of research show much of what moves a stock isn’t its unique story but a handful of shared traits, or "factors": market, size, value, momentum and quality. Factor investing targets these deliberately, and factor analysis (via a Fama-French-style regression) reveals which ones your portfolio is exposed to.
The insight is that two very different-looking portfolios can behave almost identically if they load on the same factors — and you may be running tilts you never chose.
The trap most people miss
No factor pays off reliably or on schedule; every one endures long stretches of underperformance. And "diversified across 20 names" can secretly be one factor bet worn 20 ways — which only shows up when you measure the exposures.
Frequently asked about Factor Investing
What are the main investing factors?
The most studied are market, size (small vs large), value (cheap vs expensive), momentum (recent winners) and quality (profitable, low-debt firms).
Does factor investing beat the market?
Factors have historically earned premiums over long horizons, but not reliably or on any schedule — each can underperform for years. It’s a long-run tilt, not a guarantee.
Related terms
Guides that use Factor Investing
In Tradune: run a Fama-French Factor X-Ray on your holdings.
Track what you actually own
Tradune puts every holding in one place — no brokerage login — and measures your return against a buy-and-hold SPY twin funded on your own dates.
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This definition is for educational purposes only and is not investment, tax, or financial advice. Concepts are explained in general terms; how they apply to your situation can differ. Always do your own research.