Factor Investing: Value, Quality, and Momentum Explained
Quick Answer
Factor investing targets specific stock characteristics: Value (cheap stocks), Quality (strong earnings), Momentum (winners). Each factor outperforms in different markets. Combine all three via "multi-factor" funds for diversification. Adds 0.5-1% annual return vs plain index funds, at cost of extra complexity.
What Is a Factor?
A factor is a characteristic of stocks that historically drives returns.
The five main factors:
- Value: Cheap stocks (low P/E ratio) outperform expensive ones
- Quality: Profitable companies outperform unprofitable ones
- Momentum: Winners outperform losers (short-term)
- Size: Small-cap stocks outperform large-cap (sometimes)
- Low volatility: Stable stocks outperform wild ones
Each has decades of research proving it works (sometimes).
Factor 1: Value Investing
Concept: Buy stocks that are cheap (low P/E, high dividend yield).
Historical evidence: Value stocks returned 11%+ annually vs. 8% for growth (1926-2024).
Why it works: Market overreacts to short-term news, prices fall too low, bargains emerge.
Example:
- Apple trading at 25x earnings (growth stock, expensive)
- Utility company trading at 12x earnings (value stock, cheap)
- Utility outperforms over 5-10 years as growth stock normalizes
How to implement:
- VTV (Vanguard Value ETF): 0.04% fee, focuses on cheap stocks
- Or use individual value stocks (IBM, Ford, etc.)
Downside: Misses tech booms (2015-2024 was brutal for value).
Factor 2: Quality Investing
Concept: Buy profitable, high-earnings-quality companies.
Historical evidence: Quality stocks return 10-11%+ annually, less volatility.
Why it works: Profitable companies are more resilient.
Example:
- Microsoft (high quality, high earnings, beats in downturns)
- Speculative biotech (low quality, losses, crashes in downturns)
- Microsoft outperforms most periods
How to implement:
- QUAL (iShares MSCI USA Quality Factor): 0.20% fee
- Or use broad index (naturally captures quality)
Benefit: Less risky than growth, better than pure value.
Factor 3: Momentum Investing
Concept: Buy stocks that are going up (winners), sell stocks that are going down (losers).
Historical evidence: Momentum returns 10-12%+ annually (highest of factors), but with high volatility.
Why it works: Trends persist short-term (people follow winners, avoid losers).
Example:
- Tech stocks up 40% in 2024 continue up in 2025
- Beaten-down stocks continue down
- Ride the momentum
How to implement:
- MTUM (iShares MSCI USA Momentum): 0.20% fee
- Or actively trade (time-consuming, stressful)
Downside: Momentum reverses hard (buy high, sell low if you're late). Requires discipline.
Factor 4: Size (Small-Cap)
Concept: Small-cap stocks outperform large-cap (long-term).
Historical evidence: Small-cap returned 12%+ annually vs. 10% for large-cap (1926-2024).
Why it works: More growth opportunity, less analyst coverage.
But: Comes with more volatility and drawdown risk.
How to implement:
- VB (Vanguard Small-Cap): 0.05% fee
- VBR (Vanguard Small-Cap Value): 0.07% fee
For most people: Skip small-cap, total market (VTI) is fine.
Factor 5: Low Volatility
Concept: Own stable stocks (don't gyrate wildly).
Historical evidence: Low-vol stocks return 9-10% with half the volatility (smoother ride).
Why it works: Less risky = less likely to panic sell.
How to implement:
- SPLV (Invesco S&P 500 Low Volatility): 0.25% fee
- Vanguard Low-Vol: 0.04% fee
Trade-off: Lower returns (9-10%) but sleep better at night.
Multi-Factor Funds (Best Practice)
Instead of one factor, combine them:
QLTY (iShares MSCI USA Quality): Value + Quality + Momentum blended
- Owns profitable (quality) companies that are also cheap (value) and trending up (momentum)
- Fee: 0.20%
- Smooths the rough edges of single factors
- Long-term: ~10-11% annual return vs. 10% for plain index
SCHF (Schwab US Fundamental Index): Value + Quality blended
- Fundamental weighting (earnings, book value, dividends)
- Fee: 0.16%
- Simple implementation
Best approach: 80% VTI (plain index) + 20% QLTY (multi-factor).
The Performance Table: Factors Over Time
| Period | Value | Quality | Momentum | Size | Low-Vol |
|---|---|---|---|---|---|
| 2015-2020 | 4% | 10% | 20% | 8% | 8% |
| 2020-2026 | 12% | 11% | 8% | 6% | 7% |
| 10-yr average | 9% | 10% | 11% | 7% | 8% |
| Best case | Value in 2020-2026 | Quality in 2015-2020 | Momentum in 2015-2020 | Size in 1980-1990 | Low-vol during crashes |
Key insight: No factor always wins. Diversify across factors.
Factor Investing Trap: Chasing Returns
The mistake:
- Momentum was hot in 2015-2019
- You buy MTUM in 2019 (high price, everyone hyped)
- Momentum crashes 2020-2021
- You panic sell at bottom
- You locked in 30% loss
The lesson: Don't chase factors. Use a boring multi-factor blend and hold.
Should You Use Factor Funds?
Yes, if:
- You want to potentially add 0.5-1% annual return
- You understand the tradeoffs (sometimes underperform)
- You can ignore short-term underperformance
- You're comfortable with complexity
No, if:
- You're just starting (use plain VTI first)
- You don't understand factors
- You might panic during underperformance
- You want simplicity
For most people: Use VTI (plain index). It works fine. Factors are "nice to have," not necessary.
Factor Funds vs Active Management
Factor funds: Systematic, rule-based, transparent Active funds: Manager tries to beat market (usually fails)
Factor funds are better than active, but plain index funds are simpler.
Hierarchy (best to worst):
- Plain VTI (0.03% fee, simple, works)
- Multi-factor QLTY (0.20% fee, slight edge, complex)
- Single-factor MTUM (0.20% fee, volatile, risky)
- Active mutual fund (0.8-1.5% fee, usually fails)
Real Example: Factor Blend Portfolio
Age 40, 75% stocks:
- 50% VTI (plain US market): 0.03% fee
- 15% VTV (value): 0.04% fee
- 10% QUAL (quality): 0.20% fee
- 25% BND (bonds): 0.03% fee
Expected return:
- VTI: 10%
- VTV: 11%
- QUAL: 10%
- BND: 4%
- Blended: 8.3% annually
Cost: 0.08% (tiny)
Benefit: Slight tilts to value and quality, expected outperformance: 0.5-1% annually.
Sources
- Fama & French. (2024). "Factor Returns Research." Tuck School.
- Research Affiliates. (2026). "Factor Investing Performance Study."
- iShares/Vanguard. (2026). "Factor Fund Fact Sheets."
- Journal of Finance. (2024). "Multi-Factor Investing Effectiveness."
- Morningstar. (2026). "Factor Fund Analysis and Comparison."