Volume on a chart

CANDLESTICKS, BARS, AND LINES

The same price action can be drawn three ways. A line chart connects each day's closing price with a single line, the simplest view, best when you are zoomed out over years. A bar chart draws each day as a vertical bar showing the day's high, low, open, and close in compact form. A candlestick chart, the modern default, draws each day as a colored body with thin lines called wicks above and below it.

On a candlestick, the body spans the range between the open and the close, and the wicks reach up to the day's high and down to its low. The color is the key: green (or white) when the stock closed higher than it opened, an up day, and red (or black) when it closed lower, a down day. Green means up, red means down, and you read it at a glance.

Four shapes are worth knowing on sight. A long green body means the stock rose steadily all day, strong demand. A long red body means it fell all day, strong supply. A long lower wick means the price dropped during the day but recovered to close strong, buyers stepped in at the lows. A long upper wick means it rallied but gave the gain back to close weak, sellers stepped in at the highs. Use candlesticks as your default; every charting platform offers them, and the visual language becomes intuitive within a few weeks.

TRADER TUESDAY: DAVID RYAN

David Ryan is the only person to win the U.S. Investing Championship three years running, in 1985, 1986, and 1987. The last of those included the October 1987 crash, which he navigated without the kind of loss that ended other careers. In the early 1980s he worked directly with William O'Neil, helping shape the chart-reading side of what became CAN SLIM, and he was one of the original traders featured in Jack Schwager's Market Wizards (1989).

His method was uncomplicated: find companies with strong fundamentals, wait for the stock to form a proper base, buy the breakout with a tight stop-loss, and sell when the trend changed. The chart was where the timing decisions were made.

"I wanted the right base, the right shape, the right depth, and especially the right volume signature. Without the chart, the fundamentals were just opinions."

David Ryan, paraphrased from his interview in Jack Schwager's Market Wizards (1989)

We meet him here because his edge was reading a chart fluently and fast, the exact skill this week is building. Notice his phrase "the right volume signature." Even 40 years ago, the best growth traders read volume as closely as price. His full story comes in Month 8. For now, back to the reason volume mattered so much to him.

WHAT VOLUME IS

Volume is the total number of shares traded in a given period. On a daily chart, each volume bar shows how many shares of that stock changed hands that trading day. On a weekly chart, each bar shows the week's total volume.

The absolute number isn't what matters; the relative number is. A stock that normally trades 5 million shares per day and suddenly trades 15 million is producing a volume signal. A stock that normally trades 5 million and trades 4 million today is in a quiet day. Volume is read in comparison to its own recent history.

Most charting platforms make this comparison easy by overlaying a volume moving average on the volume bars, typically the 50-day moving average of volume. Bars above the average line are heavier-than-usual days. Bars below are lighter days. Once your eye is trained, you read the comparison instinctively.

The reason volume matters is participation. A 3% price move that happens on twice the average volume tells you that 2× the normal number of shares were involved in that price action. That's a much stronger signal of intent than the same 3% move on average volume, which could just be the same group of small retail traders shuffling positions among themselves.

Price tells you what happened. Volume tells you who did it.

ACCUMULATION VS DISTRIBUTION

The two volume patterns that matter most for CAN SLIM-style trading have specific names:

Accumulation day: a day where the stock closes higher and volume is meaningfully above average (typically 25%+ above the 50-day average volume). This is the visible footprint of institutional buying, large funds adding to positions. Multiple accumulation days clustered over a few weeks is a strong bullish signal: the smart money is building.

Distribution day: a day where the stock closes lower and volume is meaningfully above average. The visible footprint of institutional selling, large holders trimming positions. Multiple distribution days clustered over a few weeks is a strong warning signal: the smart money is exiting.

Counting distribution days over a rolling 25-day window is a core CAN SLIM market-timing tool. We'll cover this in detail in Month 7 Week 2 (Distribution Days). For now, know that the count matters. Three or four distribution days in a 25-day window is concerning. Five or six is a clear sign the broader market is in trouble. We'll come back to this.

The same principle applies to individual stocks, not just the broad market. A stock with multiple distribution days in a short window is a stock that institutions are exiting. Even if the price hasn't broken down yet, the volume is telling you something the price is hiding.

"Volume is your best clue to whether buyers are accumulating shares or distributing them. Without volume, you're just looking at half the chart."

William O'Neil, paraphrased from his treatment of supply and demand in How to Make Money in Stocks (4th ed., Ch. 8, "S = Supply and Demand")

THE 50-DAY AVERAGE VOLUME BASELINE

The standard reference for "normal" volume is the 50-day moving average of volume. Most charting platforms calculate this automatically and overlay it on the volume bars as a line.

Why 50 days? Because that's roughly two months of trading days, which is long enough to smooth out noise (one earnings-related volume spike won't distort the average too much) but short enough to remain responsive to actual changes in the stock's interest level. A stock that goes from being lightly-watched to heavily-watched will see its 50-day average volume rise within a few weeks, reflecting the new normal.

Once you're using the 50-day volume MA as your baseline, the visual reading of volume becomes simple:

• Bar at or below the line: normal-to-quiet trading. No volume signal.
• Bar 25-50% above the line: above-average activity. Worth noticing, especially if it correlates with a price breakout or breakdown.
• Bar 50-100% above the line: heavy volume. Strong signal of either accumulation (if price rose) or distribution (if price fell).
• Bar 100%+ above the line: extreme volume. Almost always tied to a specific event (earnings, news, technical breakout). Worth investigating.

For breakouts specifically, the standard CAN SLIM benchmark is 40-50% above average volume on the breakout day. A breakout that hits this volume threshold is much more likely to follow through than one that breaks out on average or below-average volume. We'll come back to this when we cover the cup-with-handle in detail in Month 4 Week 1.

A QUICK READ OF A CHART'S VOLUME SIGNATURE

When you open a chart, here's a 10-second routine to read the volume:

1. Glance at the volume bars over the most recent 6-8 weeks
2. Compare them to the 50-day average line
3. Identify any clusters of above-average bars on green (up) days, those are accumulation
4. Identify any clusters on red (down) days, those are distribution
5. Note the relative balance: more accumulation than distribution, or vice versa?

A stock with multiple recent accumulation days and few distribution days is being bought into. A stock with multiple recent distribution days and few accumulation days is being sold out of. Even before you look at the price chart in detail, this read tells you which direction the institutional money is moving.

Two seconds of training to recognize the colors. Eight seconds of reading the bars. The whole assessment is 10 seconds. Once your eye is trained, you do this automatically every time you open a chart.

VOLUME ON DIFFERENT TIME FRAMES

Volume bars work the same way on weekly charts as on daily charts, but they tell you slightly different things.

Daily volume: best for spotting individual events, single-day breakouts, earnings reactions, sudden distribution. Most BiST trading decisions reference daily volume.

Weekly volume: best for spotting longer-term changes in interest level. A stock that's been trading in a narrow range for months and suddenly produces a weekly volume bar 2× its average is a stock that's just attracted significant new attention. Weekly volume rising over multiple weeks is one of the strongest signals that institutions are building a position.

For most BiST readers, the daily chart is your primary working surface. But occasionally check the weekly volume on stocks you're tracking. Patterns that look ambiguous on the daily often clarify on the weekly.