Factor Investing Using Value Momentum And Other Factors

Factors are the recognised ingredients behind returns. Decades of research have identified certain shared traits of stocks, such as being cheap, or recently rising, that have historically been linked to differences in returns, and factor investing means deliberately tilting your portfolio toward those traits. Think of it as seasoning a recipe with known ingredients, not discovering a secret sauce that guarantees a feast. It is an evidence based idea with genuine appeal, but also real limits. Here is what factor investing is, the main factors, and where it fits for an ordinary investor, drawing on the SEC and FINRA.

Factors Are the Ingredients Behind Returns

To understand factor investing, start with the idea of a factor. Over many decades, researchers studying the stock market have noticed that stocks sharing certain characteristics have, historically, tended to perform differently from the broad market. These shared characteristics are called factors. For example, stocks that are cheap relative to measures of their underlying business, known as value stocks, have historically tended to behave as a group in ways that differed from expensive ones; so have stocks that have recently been rising, smaller companies, and highly profitable firms. A factor, then, is a recognised trait that research has linked to differences in returns, a kind of ingredient that seems to season how a group of stocks performs. Factor investing is the practice of deliberately tilting a portfolio toward one or more of these traits, in the hope of capturing the return patterns associated with them. The useful mental image is seasoning a recipe with known ingredients, deliberately leaning the flavour one way, rather than discovering a secret sauce that guarantees a wonderful meal.

What Factor Investing Is

More concretely, factor investing is a systematic strategy of building a portfolio that emphasises chosen factors rather than simply holding the market as it is. A plain index fund holds stocks roughly in proportion to their size, giving you the broad market. A factor strategy instead tilts the holdings toward a particular trait, holding more of the stocks that score highly on, say, value or quality, and less of those that do not, according to defined rules. This is sometimes called smart beta, and it is usually implemented through funds designed to track a factor based index rather than the broad market. The key word is tilt: factor investing does not abandon diversification but leans a diversified portfolio in a chosen direction, on the evidence that the trait has historically been rewarded. It sits between two other approaches: plain broad market investing, which makes no bet on any trait, and active stock picking, which bets on individual companies. Factor investing is rules based and diversified like the former, but makes a deliberate, evidence based tilt like a milder version of the latter. Understanding it as a disciplined tilt, not a wholesale departure from diversification, is the right way to see it. Our portfolio diversification analyzer will tell you how much genuine spread you have.

The Main Factors

A handful of factors have been studied most and form the core of factor investing. Value refers to stocks that are cheap relative to fundamentals such as earnings or assets, on the long observed tendency for cheaper stocks to outperform expensive ones over long periods, though not reliably in any given stretch. Momentum refers to stocks that have been rising recently, on the tendency for recent winners to keep winning over the short to medium term, a pattern that can reverse sharply. Size refers to smaller companies, which have historically tended to outperform larger ones over very long horizons, while carrying more risk. Quality refers to companies that are highly profitable and financially stable, which have tended to perform well with less drama. Low volatility refers to stocks whose prices move less, which have, surprisingly, sometimes delivered solid returns with smaller swings. And underlying everything is the market factor itself, the broad return of the stock market, which is the largest driver of returns for almost everyone. Each of these is a distinct trait that research has linked to returns, but it is essential to remember that these are historical tendencies observed on average over long periods, not dependable rules that hold in any particular year. You can check the downside on a single holding with our stock risk analyzer.

Why Factors Are Thought to Work

It is reasonable to ask why these factors might generate higher returns at all, and there are two broad explanations, both worth understanding. The first is risk based: some factors may be rewarded because they expose you to extra risk that most investors prefer to avoid, so you are, in effect, paid a premium for bearing it. Value stocks, for instance, are often companies facing difficulties, and smaller companies are more fragile, so their higher historical returns may simply be compensation for greater risk, which also means real losses when those risks bite. The second explanation is behavioural: some factors may persist because of predictable human errors, such as investors overreacting to bad news and pushing cheap stocks too low, or chasing recent winners and fuelling momentum. If a pattern stems from deep rooted behaviour, it might continue even after it is widely known. Honesty requires noting the debate here: researchers disagree about how much of each factor is genuine reward for risk, how much is behavioural, and how much was simply a chance pattern in past data that may not repeat.

The Hard Truth: Factors Can Underperform for Years

Here is the hard truth that factor investing’s marketing tends to underplay: any factor can underperform the broad market for a very long time, often many years, and this is the single biggest reason factor investing disappoints people in practice. The historical return advantages associated with factors are long term averages, and they are extremely lumpy, arriving in unpredictable bursts separated by long, painful stretches when the factor lags badly. A value tilt, for example, has at times trailed the broad market for the better part of a decade, long enough to make almost anyone doubt the strategy and abandon it, frequently right before it would have recovered. This creates a brutal behavioural trap: factor investing only rewards those who hold through the long cold spells, but the cold spells are so long and discouraging that most people give up. So the realistic expectation is not steady outperformance but a bumpy ride with long disappointments and no guarantee of reward at the end. Past performance does not guarantee future results, and nowhere is that warning more apt than with factors.

How Factor Investing Is Implemented

For an investor who wants to use factors, the practical route is usually through funds rather than picking factor stocks by hand. Many exchange-traded funds and other index style funds are built to track factor based indexes, holding a diversified basket of stocks selected and weighted by a chosen trait such as value, momentum, quality or low volatility, or by a blend of several. This makes factor exposure accessible without requiring you to analyse individual companies. A few practical points matter, though. Costs are one: factor funds typically charge more than plain broad market index funds, and since higher fees directly reduce returns, any expected factor advantage can be partly or wholly eaten by costs, so keeping fees low is essential. Definitions are another: different providers define the same factor differently, so two value funds can hold quite different stocks and perform differently. The sensible way to implement factor investing, if at all, is through low cost, understandable funds held as a tilt, not through elaborate or expensive products chased on the strength of recent performance.

Where It Fits for an Ordinary Investor

So where does factor investing fit for an ordinary investor? Honestly, it is optional, an advanced refinement rather than a foundation, and many successful investors never use it at all. The foundation for almost everyone should be broad diversification at low cost, owning a wide slice of the whole market through inexpensive funds and investing patiently for the long term, which the SEC highlights through the principle of diversification and which captures the market factor that drives most returns without any need for tilts. Factor investing is a possible layer on top of that foundation, for an investor who understands what factors are, genuinely believes in the long term evidence, accepts that any tilt may underperform for years, and has the temperament to hold through those stretches without abandoning ship. For such a person, a modest, low cost factor tilt may have a place. For most beginners, the wise course is to master the diversified, low cost, long term basics first, and to regard factor investing as an optional refinement to consider much later, if at all.

Common Mistakes People Make

Factor investing attracts a few costly misunderstandings, mostly from treating historical patterns as guarantees. Here are the four to avoid.

Treating factors as guaranteed returns

Why it backfires: Expecting a factor tilt to reliably beat the market ignores that factor advantages are long term historical averages that arrive in unpredictable bursts and may not persist at all.

Do this instead: Treat factors as evidence based tilts with no guarantee, expect long stretches of underperformance, and never count on a factor to deliver extra return in any given period.

Abandoning a factor after it lags

Why it backfires: Giving up on a factor tilt during a long cold spell ignores that factors only reward those who hold through the lean years, and that investors often quit right before a recovery.

Do this instead: If you adopt a factor tilt at all, commit to holding it patiently for many years through underperformance, or do not adopt it, since switching out when it lags destroys the entire rationale.

Chasing last year’s winning factor

Why it backfires: Switching into whatever factor performed best recently ignores that factors take turns leading and lagging, so chasing the recent winner usually means buying just before it cools.

Do this instead: Avoid performance chasing entirely, choose any tilt based on long term evidence and your own conviction rather than recent returns, and hold it steadily rather than rotating between factors.

Letting factors replace diversification

Why it backfires: Concentrating a portfolio into a single factor, or into complex factor products, ignores that broad diversification is the foundation and that factors are only a tilt on top of it.

Do this instead: Keep broad, low cost diversification as your core, which captures the market returns that matter most, and treat any factor exposure as a modest, understandable, optional tilt, never a replacement.

The Honest Bottom Line

Factors are the recognised ingredients behind returns: shared traits of stocks, such as value, momentum, size, quality and low volatility, that decades of research have historically linked to differences in performance. Factor investing tilts a portfolio toward those traits, seasoning a diversified recipe rather than offering a secret sauce, usually through low cost funds that track factor based indexes. Factors may be rewarded for bearing extra risk or because of persistent human behaviour, but the causes are debated, which is a reason for humility. The hard truth is that any factor can underperform the broad market for many years, long enough that most people abandon it, and the historical patterns rest on past data that may not persist, so there is no guarantee of reward. For most investors, broad diversification at low cost is the foundation that captures the market’s returns, and factor investing is an optional, advanced refinement for those who understand it and can hold through long cold spells. Master the basics first. Past performance does not guarantee future results, and this is educational information, not financial advice.

Frequently asked questions

What is factor investing?

Factor investing is a systematic strategy of tilting a portfolio toward shared characteristics of stocks, called factors, that research has historically linked to differences in returns. Rather than holding the broad market as it is, a factor strategy holds more of the stocks that score highly on a chosen trait, such as value or quality, usually through funds that track a factor based index. It is a tilt on top of diversification, not a replacement for it.

What are the main factors?

The most studied equity factors are value (stocks cheap relative to fundamentals), momentum (stocks that have recently been rising), size (smaller companies), quality (profitable, stable firms), and low volatility (stocks with steadier prices). Underlying all of them is the market factor, the broad return of the stock market itself, which drives most returns. Each is a distinct trait historically associated with return differences over long periods.

Why might factors produce higher returns?

There are two broad explanations. The risk based view says some factors are rewarded because they expose you to extra risk most investors avoid, so you are paid a premium for bearing it. The behavioural view says some persist because of predictable human errors, like overreacting to bad news or chasing winners. Researchers debate how much of each factor is genuine reward, behaviour, or chance, which is a reason for humility.

Do factor strategies always beat the market?

No. Any factor can underperform the broad market for many years, often the better part of a decade, and the historical advantages arrive in unpredictable bursts, not steadily. This is the biggest reason factor investing disappoints in practice: the long cold spells lead most people to abandon it, often right before a recovery. The patterns also rest on past data that may not persist, so there is no guarantee.

How do you actually do factor investing?

Usually through funds rather than picking factor stocks by hand. Many exchange-traded and index style funds track factor based indexes, holding a diversified basket selected by a chosen trait or blend. Watch the costs, since factor funds charge more than plain index funds and fees eat any advantage, and note that providers define factors differently. The sensible route is low cost, understandable funds held as a patient tilt.

Should a beginner use factor investing?

For most beginners, no, at least not at first. The foundation should be broad diversification at low cost, owning a wide slice of the whole market and investing patiently, which captures the market returns that matter most. Factor investing is an optional, advanced refinement for those who understand it, believe the long term evidence, and can hold through years of underperformance. Master the basics first, and consider factors much later, if at all.

Sources

All claims in this article are supported by the sources listed below. Verify details against the originals before making investment decisions.

1. U.S. Securities and Exchange Commission, Investor.gov. Asset Allocation and Diversification. Accessed 10 June 2026.
2. Financial Industry Regulatory Authority (FINRA). Investing Basics. Accessed 10 June 2026.