Support is a price area where buying interest has tended to halt a decline; resistance is a price area where selling has tended to halt an advance. Both describe where supply and demand changed hands in the past, not where price is guaranteed to turn.
How it works
Levels form because market participants remember prices. Buyers who paid $55 and watched the stock fall often sell when it returns to $55 to get out at break-even, which creates resistance. Traders who missed a bounce from $48 tend to place orders there the next time, which creates support. The more people who share a reference point, the more orders gather around it.
Common sources of levels include:
- Swing highs and lows: the turning points of recent moves.
- The prior session's high, low and close: the references most short-term traders watch at the open.
- Moving averages: the 20-, 50- and 200-day averages act as dynamic levels because so many traders watch them.
- Gaps and round numbers: the edges of a price gap, and whole numbers such as $100.
- High-volume areas: prices where a large amount of stock has traded.
- Options positioning: strikes with very large open interest, known as options walls, where dealer hedging can slow price (see gamma exposure).
Once a level breaks, it often switches roles: former resistance becomes support on a pullback, and former support becomes resistance. This is called role reversal, or polarity.
How to read it
- Treat levels as zones. Price rarely turns at an exact cent. A cluster of lows between $48.00 and $48.40 is one support zone.
- Judge strength. A level matters more when it is visible on a higher time frame (weekly rather than intraday), was formed on heavy volume, is recent, and coincides with other levels such as a moving average.
- Repeated tests cut both ways. Each touch makes a level more visible, but it also absorbs the orders resting there, so the fourth test is often weaker than the first.
- Confirm breaks on the close. An intraday poke through a level that closes back inside is not a breakout. Many traders look for a close beyond the level on above-average volume.
- Use levels to define risk. A stop just beyond the zone marks where the trade idea is wrong; see stop-loss and position sizing.
Worked example (illustrative numbers)
A stock trades between $48 and $55 for two months. Its lows come in at $48.20, $48.00 and $48.40, which defines a support zone of $48.00–$48.50. Its highs reach $54.80 and $55.10, defining resistance around $55.
| Event | Price | Reading |
|---|---|---|
| Close above the range on twice the average volume | $56.50 | Breakout |
| Pullback holds above the old high | $55.30 | Old resistance acting as support |
| Alternative: close back below $54 | $53.80 | Failed breakout |
A trader buying the retest at $55.50 might place a stop at $53.90, below the old resistance zone, risking $1.60 per share. If price closes back inside the range, the breakout has failed and the plan is void. The levels define the plan; they do not predict which outcome occurs.
Limitations and common mistakes
- Subjectivity. Two analysts can draw different lines on the same chart; it is easy to draw levels that fit the past perfectly and say little about the future.
- Gaps. News or earnings can open a stock far beyond a level, so a stop placed there may fill much worse.
- Obvious levels attract stop orders. Price often probes just beyond a well-known level before reversing, which is why stops placed exactly at the level get hit.
- Thin stocks. Levels on illiquid stocks reflect few participants and break easily.
- Ignoring context. Support in a downtrend breaks more often than support in an uptrend.
In Clear Tape
The daily pre-market analysis includes a key levels table: Clear Tape's support and resistance for each covered stock, set against the live price and labeled broke support, near support, in range, near resistance or above resistance. On Clear Cut, each stock card can show the nearest support and resistance with its basis, such as Clear Tape's own level, a swing high or low, the 20- or 50-day average, the prior session's high or low, or a put or call wall. Following a stock closely adds price alerts at those levels. The Crypto page shows Clear Tape's Bitcoin support and resistance. The analysis, Clear Tape's own levels on cards and Bitcoin levels are available to Pro members; the other key levels on cards, price alerts and unlimited Clear Cut cards to Tools and Pro members; the Free plan includes 10 Clear Cut cards a day.
For educational purposes only. Not investment advice.