ETFs & Funds · Pro · 4 min

Factor and smart-beta ETFs

You can explain what factor and smart-beta ETFs do differently from market-cap index funds, name the common factors, and describe their main risks.

Sorted by traits

A classic index fund buys companies by size: the bigger the company, the bigger its weight. That is simple, cheap and follows the market as it is.

Factor funds take a different approach. They keep the index idea, with fixed rules and no stock picker, but select and weight companies by certain traits: cheap, rising, calm, profitable. This lesson explains what that means, and why it is harder to live with than it sounds.

Rules, not stock pickers

Factor investing means tilting a portfolio towards stocks with characteristics that research has linked to differences in return over long periods. MSCI's research describes six such factors:

Value: stocks that are cheap relative to earnings, book value or dividends.
Size: smaller companies.
Momentum: stocks with strong recent price gains.
Quality: profitable companies with low debt and stable earnings.
Low volatility: stocks whose prices move less than the market.
Yield: stocks with high dividends, screened for quality.

Smart beta is the marketing term for index funds built on such rules instead of plain market-cap weights. They sit between passive and active: the rules are fixed and published, but they deliberately differ from the market.

Each factor comes with trade-offs:

Long dry spells. MSCI's own research notes that several factors lagged the broad market over extended periods. A tilt can feel wrong for many years.
Costs and turnover. Momentum, in particular, changes its holdings often, which raises trading costs inside the fund.
Crowding. When many investors chase the same factor, its advantage can shrink.

A factor ETF is therefore a bet that a certain kind of stock will do better than the market over your holding period, not a free improvement.

Patience is the cost

A fictional investor buys a value ETF instead of a broad market fund.

For five years, value stocks trail the market. The investor's fund is 15% behind the broad index.
Many investors in the fund give up and sell.
In the following two years, value stocks recover strongly and close much of the gap.

The investor who stayed got roughly the market result over seven years, with a very different path. The investors who left locked in the shortfall.

Common mistakes

Buying the factor that just did best. Recent strength says little about the next years.
Expecting a factor to always win. Long periods of trailing are normal.
Ignoring costs and turnover. They can eat much of a factor's advantage.
Combining tilts without a plan. Several factor funds can cancel each other out.

The takeaway

Factor ETFs tilt towards stocks with traits like value, momentum or low volatility. They can beat or trail the market for many years.

Check yourself

Quick quiz

4 questions. Instant feedback, nothing is saved.

1Tap the factor that selects stocks with strong recent price gains.

Tap the chart.

MSCI's momentum indices weight stocks by their 6- and 12-month price momentum, adjusted for volatility.
2Which six factors does MSCI's research describe?

MSCI builds factor indices for these six, each with published rules.
3What is a typical risk of factor ETFs?

MSCI's own research notes that several factors lagged the market over long stretches.
4Why do momentum strategies often have higher costs inside the fund?

MSCI reports very high turnover for momentum indices, which makes them more expensive to replicate.

of 4 correct.