How the stop is calculated
On the first evaluation the monitor stores a high watermark: the larger of the create-time price and the live print. Later ticks raise that high when the live price makes a new peak. The stop is that high times (1 - your percent / 100). It fires when the live price is at or below the stop, rounded to cents. A 10% setting from a $148.20 high stops at $133.38.
Example: NVDA trails 10% from a new high
You save Trailing stop from the high at 10% while NVDA is $140. The first tick seeds the high at $140, so the first stop is $126. NVDA later prints $148.20. The high becomes $148.20 and the stop rises to $133.38. A later print at $133.38 fires. After the email, the alert stays triggered.
- •A move to $150 after $148.20 would have raised the stop again before any fire.
- •Price at the stop fires. Price 108 versus stop 108 fires.
Price decreases by uses a different baseline
Price decreases by measures from the last price at the moment you saved the alert. That number never rises. Trailing stop from the high follows the peak after you save. A 10% drop from create price can fire Price decreases by while the trailing stop is still quiet, because the stock made a higher high first.
Not a 52-week high
Reaches new 52-week high uses the exchange 52-week high on the stock record. Trailing stop from the high only tracks the peak while this alert is active. A stock can sit far below its 52-week high and still trail 10% from a recent bounce.
How to set it up
- •On app.stockalert.pro, open create alert and pick the stock.
- •Under Price, choose Trailing stop from the high, enter the percent (5, 8, 10, 15, or 20 are the quick picks), then save.
Email and SMS both work. After a send, the alert stays triggered. Create a new one if you want another trail from a later high.
When this type fits
- •Protect a winner: the stop should rise as the stock makes new highs.
- •One ping when the giveback hits your percent. It does not re-arm after the send.