How to Make Money in Stocks — Chapter 5: Follow-Through Days & Reading Market Direction

"You can pick the right stock and still lose money if the market is falling. M is the most overlooked and most expensive of the seven factors." — William O'Neil

Financial Context

O'Neil considered M — market direction — the last letter but the first in importance. His data showed that roughly three of four stocks follow the general market, meaning that in a declining market even flawless selection usually loses.

This chapter's task is converting "market direction" from a vague feeling into a countable, mechanical determination.

Wall Street Application

1. Counting Distribution Days

• Definition: The index falls more than 0.2% on volume higher than the prior session.
• Meaning: The footprint of institutions selling into size.
• Counting rule: Accumulate within a rolling 25-session window.
• 1–2: normal
• 3–4: caution; reduce new buying
• 5 or more: the uptrend is usually broken; cut exposure substantially

2. The Follow-Through Day

This is O'Neil's most original contribution — how to identify the end of a decline.

• Day 1: The index undercuts an intraday low and closes higher, beginning an attempted rally.
• Days 4–7: If on one of these days the index gains more than 1.25% on volume above the prior day, that is a follow-through day.
• Meaning: Confirmation that institutional money has re-entered.

Why wait until day four: the first three days of a rally are extremely common in bear markets — the dead cat bounce. Waiting filters out rebounds lacking institutional participation.

3. The Limits of the Signal

Be honest: follow-through days fail. O'Neil acknowledged roughly a third of them do not lead anywhere.

Their value is not accuracy but this: every genuine bull market begins with one. It is a necessary rather than sufficient condition — missing it guarantees missing the start, while seeing it does not guarantee an advance.

Trading Execution Rules

1. Log distribution days daily: Maintain the rolling 25-day count and mechanically reduce exposure above four.
2. Do not commit heavily before a follow-through: Buying rebounds inside a downtrend is behavior O'Neil explicitly warns against.
3. Accept failed signals: If the index quickly undercuts the rally low afterward, step back rather than insisting the signal must work.

Relevance to a Retirement Portfolio

Distribution and follow-through counting are active timing tools and are not recommended for core retirement assets — timing has a poor long-run record, and missing a handful of the best days materially damages returns.

One idea is worth keeping: O'Neil replaced "I feel the market is topping" with countable objective criteria. If you make any tactical adjustment to a retirement portfolio, it should likewise rest on objective triggers written down in advance rather than on present sentiment.