Stock Charting Tips: Leading the Charge with Bull Flag Patterns

Pretty pictures come in all shapes, especially this little breakout pattern. A chart moving downward after a run-up doesn't necessarily mean the end of the tr flag pattern stock chart
2 min read
Photo by

Patterns. People tend to gravitate to them. Why? Because they're familiar. If you do something long enough you might recognize that certain patterns of behavior may lead to certain results. The “bull flag” is a continuation-price pattern and is common in a bullish trending environment. It's important to understand the pattern's formation and how some investors measure a potential target. When the bulls hoist a flag, it could be a signal to charge ahead.

The flag pattern is divided into three parts:

1. The flagpole

2. The flag

3. The move after the flag

Think of the pattern as the bulls waving a flag before the next charge, because a bull flag is often a brief pause in the middle of a strong market move. Let's dig into the psychology behind the flag pattern.

Anatomy of a Flagpole

Phase one. Imagine you're watching the stock of a cell-phone company. Good news comes out that the phone's artificial intelligence can now call your mother-in-law and carry on the conversation for you. Clearly, traders are excited by this company's prospects, and suddenly, they start buying more of its stock than selling it. As such, the stock price rises and volume increases, confirming greater trading activity. This is the formation of the flagpole.

Phase two. The price movement eventually starts to stall as buyers bank profits. Now there appears to be better equilibrium between buyers and sellers. The trading volume begins to slow down and price action moves sideways, to slightly down. We sometimes say the market is “catching its breath.” This is the formation of the flag.

Phase three. Knowing demand for a smartphone that automatically talks to mother-in-laws isn't over, traders want more, and buying starts up again. An imbalance in supply and demand once again encourages the price to rise on high volume. This is the movement after the flag.

Bringing It Together

The flag formation itself has a parallel level of support and resistance sloping slightly downwards, that may last three-to-fifteen trading periods. (See the chart in Figure 1.) It's sort of like a downward-tilted rectangle. After price action moves upward again, it often moves roughly the same distance as the move prior to the flag formation. Because the move is roughly the same as the “flagpole,” it's often said that the flag is flying at half-mast. This can be useful in selecting a possible price target.

stock chart bull flag pattern


The flagpole begins with a resistance breakout and ends where the bull flag begins. This distance is added to the flag breakout to come up with a target. Chart from TD Ameritrade’s thinkorswim. For illustrative purposes only.

Investors implementing this theory would calculate their target in this manner. Again, referring to Figure 1, this investor would typically expect the move after the flag to be roughly the same as the flagpole's move. Measure the flagpole starting from the resistance breakout that initiated the bullish move preceding the flag, to the high where the flag begins. Add this measurement to the flag's trend line breakout and voila! There is a possible range for a target price.

Flags are just one of many recognizable trading patterns. But we're not talking about just any old flag here flapping in the wind. This is the bull's banner.


Do Not Sell or Share My Personal Information

Content intended for educational/informational purposes only. Not investment advice, or a recommendation of any security, strategy, or account type.

Be sure to understand all risks involved with each strategy, including commission costs, before attempting to place any trade. Clients must consider all relevant risk factors, including their own personal financial situations, before trading.


Market volatility, volume, and system availability may delay account access and trade executions.

Past performance of a security or strategy does not guarantee future results or success.

Options are not suitable for all investors as the special risks inherent to options trading may expose investors to potentially rapid and substantial losses. Options trading subject to TD Ameritrade review and approval. Please read Characteristics and Risks of Standardized Options before investing in options.

Supporting documentation for any claims, comparisons, statistics, or other technical data will be supplied upon request.

This is not an offer or solicitation in any jurisdiction where we are not authorized to do business or where such offer or solicitation would be contrary to the local laws and regulations of that jurisdiction, including, but not limited to persons residing in Australia, Canada, Hong Kong, Japan, Saudi Arabia, Singapore, UK, and the countries of the European Union.

TD Ameritrade, Inc., member FINRA/SIPC, a subsidiary of The Charles Schwab Corporation. © 2024 Charles Schwab & Co. Inc. All rights reserved.

Scroll to Top