Stock Trading Strategies: Momentum, Trend Following, Value and Quality

Most rules-based stock strategies belong to one of four families: momentum (buy the stocks that have risen most compared with others), trend following (hold a stock while its own trend is up and step aside when it breaks), value (buy stocks that look cheap on valuation ratios) and quality (buy profitable, financially strong companies). Each family has academic research behind it, and each has also gone through long stretches of doing worse than the market. None of them is a guarantee, so the right question is which one you understand well enough to stick with through its bad years.

Why think in families?

Every lasting strategy needs a reason to work: either it is paid for taking a risk others avoid, or it exploits a behaviour that keeps repeating, such as investors reacting slowly to news. Knowing the reason also tells you when the strategy should struggle, so a bad year does not shock you into quitting at the worst moment.

1. Momentum

Idea: stocks that have outperformed over the last 3-12 months have tended to keep outperforming for a while. Jegadeesh and Titman documented this in a well-known 1993 study, and it has since been found in many markets.

Typical rule: rank every stock in a universe by its return over the past 12 months, skipping the most recent month (very short-term returns tend to partly reverse). Buy the top group, hold for a month, and repeat.

When it struggles: momentum can crash when the market rebounds sharply after a deep fall, because the previous losers (now cheap and beaten down) jump the most. Daniel and Moskowitz (2016) studied these "momentum crashes", including 2009. Turnover, and therefore cost, is high.

2. Trend following

Idea: instead of comparing stocks with each other, look at each stock against its own history. Own it while its trend is up; exit when the trend breaks. Research on "time-series momentum", such as Moskowitz, Ooi and Pedersen (2012), found this effect across many markets.

Typical rules: a golden cross (see moving averages), a close at a new 52-week high (George and Hwang, 2004, linked nearness to the 52-week high with future returns), or a breakout above the highest close of recent weeks, each with a trailing stop.

When it struggles: in choppy, sideways markets, where it is repeatedly stopped out. Trend systems often win less than half their trades and depend on a few large trends.

3. Value

Idea: buy stocks that are cheap relative to their earnings, cash flow, sales or book value (see valuation ratios). Fama and French's research in the early 1990s found that cheaper stocks had earned higher average returns over long periods.

Typical rule: rank by a ratio such as earnings yield, free cash flow yield or EV/EBITDA, buy the cheapest group, rebalance once or twice a year.

When it struggles: value can lag for many years. In the US, value stocks did worse than growth stocks for much of the 2010s. The bigger danger for individual picks is the value trap: a stock that is cheap because its business is genuinely shrinking.

4. Quality

Idea: companies with high and stable profitability, high returns on capital and low debt have tended to deliver better risk-adjusted returns than their low-quality peers. Novy-Marx (2013) linked gross profitability to returns, and other researchers have built broader "quality" measures.

Typical rule: rank by return on invested capital, profit margins, earnings stability and low debt (see free cash flow and the balance sheet); buy the top group.

When it struggles: in "junk rallies", often early in a recovery, when the weakest companies bounce hardest; and when quality stocks become so popular that investors overpay for them.

A fifth idea: pullbacks and mean reversion

Short-term strategies buy sharp dips in stocks that are otherwise in uptrends, often using RSI (see RSI and ATR). They win often but by small amounts, so costs matter a great deal, and a dip that turns into a crash can wipe out many small gains.

The families side by side

Family	Buys	Typical holding	Turnover	Tends to struggle when
Momentum	Recent relative winners	1-6 months	High	Sharp rebounds after crashes
Trend following	Stocks in their own uptrend	Weeks to years	Medium	Sideways, choppy markets
Value	Cheap stocks	6-24 months	Low	Growth leads for years; value traps
Quality	Profitable, strong companies	Years	Low	Junk rallies; quality gets overpriced
Pullback	Dips in uptrends	Days	High	Dips become crashes; high costs

Combining families

Value buys recent losers that are cheap; momentum buys recent winners. Research such as Asness, Moskowitz and Pedersen (2013) found that the two have tended to do well at different times, so a mix has historically given a smoother ride than either alone. Quality pairs naturally with value, because it helps screen out value traps.

How DanioX tests stock strategies

The DanioX stocks backtest takes six rules from published research, including a golden cross, trend breakouts, all-time and 52-week highs, pullbacks and momentum, and tests them without tuning on the 100 largest NYSE and Nasdaq companies, after costs, against the S&P 500. The best rule under criteria fixed before the test is the one shown live on the stocks page. Because the universe is only the very largest companies, some effects found in broad academic samples may look weaker or stronger there. Check the pages for current results; the methodology page explains the testing rules.

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