How the percent is calculated
Each tick compares the live price to the stored previous close. After 4:00 PM ET the live price is replaced by that day's regular close, so an after-hours wick cannot fire the alert. If the close is missing or not positive, the monitor skips until a valid close exists. The threshold is a positive percent: 5 means five percent up from that close.
Example: NVDA already through 5%
NVDA closed at $100. You save Up from previous close at 5%. Premarket at $106 is +6%, so the alert fires on the next evaluation. Price does not have to fall back under 5% first.
- •Same Eastern day at $110 (+10%): no second email. Premarket and regular hours share one session date.
- •After the send it stays triggered. Turn it back on to watch the next close. The same Eastern day still stays quiet.
Price increases by uses a different baseline
Price increases by measures from the last price at the moment you saved the alert. If NVDA closed at $100 and you create this alert at $97, a move to $103 is +3% versus close. A 3% setting here fires at $103. Price increases by at 3% is still waiting on the $97 print.
How to set it up
- •On app.stockalert.pro, open create alert and pick the stock.
- •Under Price, choose Up from previous close, enter the percent (3, 5, 8, or 10 are the quick picks), then save.
Email and SMS both work. After a send, the alert stays triggered.
When this type fits
- •Gaps, premarket spikes, a regular session that is already running hot versus yesterday's close.
- •One notification. Turn it back on if you want to watch again. The same Eastern day stays quiet.