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Watch the premarket gap change
Before the open, Gap (%) and Gap ($) use the latest premarket print against yesterday’s close, so the list re-ranks as trades come in. Three more pieces show whether the gap is growing or shrinking:
Pre-market Highs: fires each time price tops its earlier premarket high.
One premarket gap, four readings. Example numbers, not a real trade.
Only want gap ups? Set the Gap (%) minimum above zero. Gap downs: set a maximum below zero. For the wider premarket picture, see the premarket scanner.
Premarket hours, hour by hour
Premarket isn’t one block of time. It acts different depending on the clock, and a scan that ignores that will show you a lot of noise.
4:00 to 7:00 a.m. ET. Very thin. A few hundred shares can push a stock 15%. Good for spotting news early, not for trusting the price.
7:00 to 8:30. Volume starts to show up, especially on earnings names. Gaps start to mean something.
8:30 to 9:30. Economic numbers hit at 8:30, and the gap list can reshuffle in a minute. This is when most traders build the final watchlist.
A simple way to fight the thin-print problem is a volume floor that rises with the clock. Some traders run 25,000 shares before 7:00, 100,000 by 8:00 and 250,000 by 9:00. Trade Ideas lets you keep separate saved scans for each, so you just switch windows as the morning goes.
Trader tip
Example, made-up numbers. A $30 biotech prints $33 at 5:10 a.m. on 4,000 shares, a 10% gap. By 7:30 it’s back to $31.20 on 90,000 shares, so the gap shrank to 4%. At 8:40 a second headline hits and it runs to $32.80. The premarket high alert fires there because it topped the earlier 7:00 high. Position in premarket range reads 100. If you had trusted the 5:10 print, you would have been chasing a number that was gone two hours later.
Also watch the distance below the premarket high right before the bell. A stock sitting 3 cents under its high at 9:29 has buyers leaning on it. One sitting 80 cents under has already given some back, and that changes the open quite a bit.
Last thing: premarket highs and lows make handy lines for the regular session. A lot of opening moves start right at them, which is why the alert exists in the first place.
Key point
A note on news timing. Many companies report earnings between 6:00 and 8:00 a.m. ET, and the gap can flip in seconds when the numbers cross the wire. If a name on your list goes quiet right before its report, that’s why. Mark the report times on your watchlist so a sudden 12% swing at 7:01 doesn’t surprise you. Then let the volume floor decide whether the new gap is worth your attention or just early noise.
