Time horizons: which fundamentals matter at which speed
Lesson 2 · about 9 min
Every piece of fundamental information has a natural speed. Some of it moves a stock within seconds. Some of it takes years to show up in the price. A trader who matches the information to the holding period uses fundamentals well; one who mismatches them is using a calendar to tell the time.
The speed of information
| Information | Typical time to be priced in | Useful to whom |
|---|---|---|
| Earnings beat or miss vs consensus | Seconds to minutes | Day and swing traders |
| Guidance change | Minutes to days | Swing traders |
| Analyst upgrades and downgrades | Minutes to a day | Day traders, swing traders |
| Post-earnings drift | Weeks to a few months | Swing and position traders |
| Insider buying clusters | Weeks to months | Position traders |
| Margin expansion, ROIC improvement | Quarters to years | Investors |
| "Undervalued vs peers" | Months to years, or never | Investors |
The market is not perfectly efficient, but it is fast at the top of that table and slow at the bottom. A headline EPS number is read by algorithms before a human finishes the first sentence of the press release. A gradual improvement in return on invested capital is something the market notices over several quarters as each report confirms it.
ACME at three speeds
Take ACME Corp with its $40 share price and $2.10 trailing EPS, and imagine three people looking at the same set of facts on the same morning.
The day trader cares that ACME reports before the open in eleven days. On the day, they care about the EPS line versus the $0.58 consensus, the revenue line versus $520M consensus, and the first thirty minutes of trading. Nothing about ACME's long-run competitive position matters to them at all. They will be flat by 4pm.
The swing trader cares about the same report but also about what comes after it. If ACME beats by a wide margin and raises full-year guidance from $2.40 to $2.60, that is the kind of surprise that historically continues to be absorbed over the following weeks (module 4 covers this drift). Their holding period of one to four weeks matches the speed of that information.
The investor cares that ACME's operating margin has gone from 12% to 15% over three years and that it is buying back 3% of its shares each year. They expect that to compound and are willing to hold through the next several earnings reports, including ugly ones, to collect it.
All three are using fundamentals. They are using different fundamentals, because different fundamentals move at different speeds.
Key idea: Match the fundamental input to your holding period. Fast information (surprises, guidance) for short holds; slow information (margins, capital returns, valuation) for long ones. Mixing them is how "I was right about the company" turns into "but I lost money on the stock."
The mismatch that costs the most
The most expensive mismatch is using slow information to justify a fast trade. It sounds like this: "ACME is a great company with growing margins, so I'll buy it into earnings." The margin story is true and may take three years to matter; the earnings reaction takes three minutes and is driven by whether $0.58 was beaten. The trader has risked a fast outcome on a slow thesis.
The reverse mismatch is cheaper but still real: selling a long-term holding because one quarter missed by two cents. The investor let a fast input override a slow thesis.
Fundamentals and the holding period in numbers
A rough way to think about it: over a one-day hold, the news of that day explains most of the move. Over a one-month hold, the news of the month explains some of it and the general market and sector explain the rest. Over a five-year hold, the growth of earnings per share explains most of it, and the entry multiple explains a good deal of the rest.
An illustration with ACME. Suppose EPS grows 10% a year for five years, from $2.10 to about $3.38. If the P/E stays at 19, the price would be roughly $64. If the P/E compresses to 14 because rates rose (module 6), the price would be about $47. If it expands to 24, about $81. Over five years, both the earnings growth and the multiple change matter enormously. Over five days, neither is measurable; only the surprise and the flow matter.
What this means for the rest of the course
Because this is a course for traders, most of the detail sits in the fast and medium rows of the table: reading a report quickly (module 2), interpreting the ratios the reaction will be judged against (module 3), earnings season (module 4), event catalysts (module 5). The slow rows, sector and macro context, come in module 6 as backdrop, because the backdrop decides whether a good report gets rewarded or ignored.
Try it: Write down your typical holding period in days. Then list the last three fundamental reasons you entered a trade. For each, estimate the speed at which that information is normally priced. If the speeds do not match your holding period, you have found a leak.
Recap
- Fundamental information has a natural speed: surprises price in within minutes, margin trends within years.
- Day traders use the surprise; swing traders use guidance changes and drift; investors use margins, capital returns and valuation.
- The most expensive mistake is justifying a fast trade with a slow thesis.
- Over days, the surprise and flows dominate; over years, EPS growth and the multiple dominate.
- This course focuses on the fast and medium rows, with sector and macro as the backdrop.
See it drawn
Original diagrams for the ideas on this page. Illustrative, not real market data.