Price Alerts vs Market Cap Alerts: When Each One Fits

Published Oct 26, 2026

A price alert watches the price of one share. A market cap alert watches the value of the whole company. Most of the time they move together, so it can seem not to matter which one you use. This article explains where they differ, and how OpScout checks each.

What each one measures

Price is what one share trades for. It is the number a broker shows next to an order, and the number most charts plot.

Market capitalization is the share price times the number of shares outstanding: what the market values the whole company at. It answers a different question: not "what does a share cost?" but "how large is this company?"

Where they differ

Comparing companies

A price says nothing about size. Two companies with the same share price can differ in value many times over, because one has far more shares than the other. A market cap level means the same thing on any stock, so the same kind of threshold can be applied across a watchlist.

Splits and share counts

A stock split changes the price of a share but not the value of the company. After a split, a price level set before it may no longer mean what it meant. A market cap level does not depend on how the company is divided into shares.

The share count does change for other reasons: buybacks reduce it, new shares increase it. A market cap moves with those as well as with the price. OpScout does not adjust Monitors or their thresholds for splits or other corporate actions, so it is worth reviewing your Monitors after one. Timing and data limitations.

What the figure comes from

For a price Monitor, OpScout uses the latest regular-session price the data source reports. For a market cap Monitor, it uses the market cap as the data source reports it. OpScout does not calculate market cap itself, and the share count and price behind it are the data source's own and may not be current. The two figures can also reflect slightly different moments.

When each tends to fit

A price alert tends to fit when:

• the level you care about is a price you would act at, such as a price you would buy shares at;
• you are tracking a level on a chart;
• you follow one company and think about it in per-share terms.

A market cap alert tends to fit when:

• the level you care about is a valuation, such as a size you consider the company worth;
• you want the same kind of threshold across many companies;
• you want the threshold to survive a split.

Neither is a better alert in general. They answer different questions.

How OpScout checks both

Price and market cap Monitors work the same way:

• Above is met when the value is at or above your level; below when it is at or below. Equality counts as met.
• Each Monitor is checked in cycles about every 15 minutes during the U.S. regular trading session, not continuously. A level crossed only between two checks may never be detected.
• Pre-market, after-hours and overnight prices are not used. A level crossed only in those hours does not produce an Alert, unless it is still crossed when the session opens.
• A Monitor set to Once alerts you the first time its condition is met. A Monitor set to Repeat is checked again after its interval and can alert you again while the condition still holds. When Monitors are evaluated.

You can run both kinds side by side on many stocks, and keep them on for as long as you like.

Getting the Alert

An Alert is sent to the delivery channels you chose for the Monitor, such as a push notification or WhatsApp. A Notification is sent after the Alert is recorded and can arrive later than the check that produced it. Getting alerts on WhatsApp.

An Alert says that a level you set was reached. It is not a signal to buy or sell, and what you do next is your decision.

Set up price and market cap alerts · Glossary