If valuation and quality evaluate “the company itself,” momentum looks at “market trends” and dividends look at “cash flow.” Understanding these two factors broadens the lens for stock selection.
Momentum
Definition
Momentum is the return over a past period.
N-month Momentum = (Current Price - Price N months ago) / Price N months ago
The core principle is simple. Stocks that rise tend to keep rising, and stocks that fall tend to keep falling. This is called trend following. It is an academically validated phenomenon. Jegadeesh and Titman showed in their 1993 paper that buying past 3-12 month winners and selling losers generated significant excess returns.
Period Characteristics
Momentum behaves differently depending on the measurement period.
1-month momentum. In the short term, a reversal effect can appear instead of trend following. Stocks that surged may pull back from overbought levels, or crashed stocks may bounce from oversold levels. This is why 12-month momentum strategies commonly exclude the most recent month.
3-6 month momentum. This is where the momentum effect appears most strongly. Trends in this range relate to the speed at which fundamental information — earnings announcements, analyst reports — gets priced in.
12-month momentum. Captures long-term trends. Typically calculated excluding the most recent month to avoid the short-term reversal effect.
Why Momentum Works
Behavioral economics explains why momentum exists.
Underreaction. Investors do not react immediately to new information. Even after strong earnings, the stock price adjusts gradually rather than all at once. This gradual adjustment creates trends.
Herding. As prices rise, more investors join the buying. This positive feedback loop reinforces the trend.
Confirmation bias. Investors weigh information that supports their existing views more heavily. In uptrends, they react more to positive news; in downtrends, more to negative news.
Caution
The most critical consideration in momentum calculation is preventing Look-ahead Bias. Momentum scores must be calculated as of the rebalancing date. Using future data at the current point produces backtest results better than reality.
Dividend
Dividend Yield
Dividend Yield = Annual Dividend / Current Price × 100%
Dividend yield shows how much dividend income you receive relative to the stock price. A 5% yield on a $100 stock means $5 in annual dividends.
Dividends provide cash flow independent of price appreciation. Even if the stock price does not rise, dividends alone generate returns.
Characteristics of High-Dividend Stocks
High-dividend stocks are typically mature companies. Their businesses have stabilized, and they return a significant portion of profits to shareholders. They are common in utilities, telecommunications, and financial sectors.
The advantage is stable cash flow. Even in market downturns, dividend income partially offsets losses. The disadvantage is potentially lower growth. Money paid as dividends is not reinvested in the business.
A high dividend yield is not always positive. If the stock price drops sharply, the dividend yield rises mechanically. In such cases, a high yield may reflect a distress signal rather than generosity. Dividend sustainability should always be verified.
Relationships Between Factors
Momentum and dividends, together with valuation and quality, form the building blocks of multi-factor strategies. Interesting relationships exist among them.
Momentum and value often point in opposite directions. Value stocks (low PER/PBR) may be stocks whose prices have fallen. Fallen stocks have low momentum. Conversely, high-momentum stocks may have risen to the point where PER/PBR is elevated.
Dividends and quality correlate. Sustaining high dividend payments requires consistent earnings. Companies with high ROE and low debt ratios are more likely to maintain stable dividends.
These inter-factor correlations are why multi-factor strategies — combining several factors — tend to produce more stable results than single-factor approaches.
Momentum follows market trends. Dividends verify cash flow. Because they offer different perspectives from valuation and quality, combining them diversifies stock selection.
The next post will cover how to measure strategy performance — the key metrics of backtesting.