What happens after the closing bell?
Course 1 left you a cliffhanger: if exchanges are closed four-fifths of the time, when do prices "jump"? Here's the resolution — and with it, the explanation for the most startling chart pattern a beginner meets.
The quiet sessions
Around the regular US session (9:30–16:00 ET) exist pre-market and after-hours sessions where trading is allowed but thin. Fewer participants, scarcer market makers, wider spreads, smaller volumes — prices CAN move there, but on far less conviction. A 5% after-hours move can evaporate by the next morning's open... or triple.
Why companies report when markets rest
Earnings releases land almost ritually outside regular hours — before the open or after the close. The logic: give everyone time to read before continuous trading resumes, rather than detonating news into a live order book. (You met the earnings calendar in Course 1; now the odd timing makes sense.)
The gap — resolved
Overnight, the world keeps happening: earnings, geopolitics, Asia and Europe trading their sessions. All those hours of information compress into the first trade of the new day — which is why a stock can open far from yesterday's close with no trading in between. On the chart it looks like a tear in the price: the famous gap.
Gaps aren't glitches or unfairness; they're markets re-agreeing on price after new facts. Limit orders (Course 1) exist partly for exactly this: a resting market order can fill at a gapped price you never imagined; a limit order cannot.
The order most people rest overnight is a stop. A stop-loss is a market order with a trigger: it does nothing until a trade prints at or through the stop price, then it becomes an ordinary market order and fills at the next available price. On a normal day that is cents from the stop. On a gap the first trade of the day is both the trigger and the fill, so a stop set 10% below your cost can fill 20% below it. A stop-limit order trades that problem for its opposite: it will not fill below your limit, so through a large gap it may not fill at all. A stop caps nothing. It decides when you become a market order.
The 24-hour information relay
Put the whole unit together: news breaks in Asia's afternoon → Europe prices it at its open → US futures (a preview instrument you'll meet later) drift all night → New York opens with a gap that "happened" hours ago on other continents. Nothing jumped, really — you just weren't watching the venues that were open.
In the data
An exchange publishes its session, and the published hours are the regular session only. Here is the US market's calendar of short days:
Two things follow. The pre-market and after-hours windows above are not in the published hours, so a trade stamped at 18:00 New York time is not a data error; it is the quiet session. And a few days a year are neither holidays nor full days: the market closes at 13:00 local time, and anything that assumes every session runs 09:30 to 16:00 gets those days wrong.
Try it now
- Find a recent earnings day and look at the daily chart: spot the gap between that day's close and the next open. Apple reported on 30 July 2026, after the close; the report's row is below, and so are that session and the one after it. Find the same two candles on the year of daily bars under them.
- Measure it in % — the second day's open against the first day's close, or Measure from one to the other on the chart. That's the after-hours re-pricing you now understand. For your own anchor company, open it in the Terminal, change the symbol there, and look for the same tear beside its last report date.
Open AAPL.US in the EODHD Terminal
- Unit checkpoint ahead: venues, IPOs, off-exchange trading, gaps. Then — the measuring sticks themselves: indices, up close.