To set a stop-loss for a stock position, open your brokerage account’s order ticket, choose the available sell stop (also called stop-market) or sell stop-limit order, enter the trigger price and share quantity, choose the duration, review the broker’s trigger rules, and submit the order. A stop price is only a trigger—not a guaranteed sale price. Set account alerts separately in the account’s notification settings; an alert sends a message but does not place a trade.
The exact labels, supported order types, trigger convention, trading-session eligibility, and expiration rules differ by brokerage firm and security. The SEC’s investor bulletins explain the mechanics but do not prescribe a universal stop percentage or a particular price. Use the instructions below as a framework, then confirm the fields and policies shown in your own account.
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Stop-loss and alert: two different account tools
“Stop-loss” is common shorthand for a sell stop order intended to exit a long stock position if the market falls to a chosen level. It is an executable instruction. When its trigger condition is met, a standard sell stop becomes a market order and is sent for execution.
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A price or account alert is only a notification. It can tell you that a price, transaction, login, password change, personal-information change, failed login, or transfer event occurred, depending on what your firm offers. It does not submit, cancel, or modify an order, and receiving it does not guarantee that you can act before the market moves again.
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The SEC Office of Investor Education and Assistance describes these mechanics in its Stop, Stop-Limit, and Trailing Stop Orders – Investor Bulletin, updated August 18, 2026. That bulletin represents staff investor-education views, not a binding rule or regulation.
What you need before entering an order
Have the following information ready before opening the ticket:
- The exact security and account in which you hold it.
- The number of shares to protect. A stop order normally applies only to the quantity entered.
- The trigger level you have chosen for your own risk plan. The SEC does not identify one suitable percentage for everyone.
- Whether you need execution priority (sell stop) or a minimum acceptable price (sell stop-limit).
- The duration you want, such as Day or a broker-defined good-till-canceled (GTC) period.
- Your firm’s rules for trigger prices, trading sessions, order eligibility, and fractional shares or other special cases.
Do not assume that a feature shown for one security is available for another. Order availability and policies are firm-specific. If the ticket is unclear, read the broker’s order-type help page or ask its support team before submitting.
How a sell stop order works
For a long position, you enter a sell stop trigger below the current market price. If the broker’s trigger condition is met, the order converts to a market order. A market order seeks execution at the best available prices, but the price can be substantially different from the trigger when the stock is moving quickly or available liquidity is limited.
The SEC states the key limitation plainly: The stop price is not the guaranteed execution price for a stop order. A brief intraday move can activate the order even if the stock later recovers. The eventual fill can also be materially worse than that day’s closing price.
Trigger definitions vary. Some firms use the last-sale price; others use quotations, such as a bid or ask. A quote-based trigger and a last-sale trigger can activate at different moments. Check the rule that applies to the specific order and security instead of relying on terminology used by another broker.
Step-by-step: enter a sell stop or stop-market order
- Open the order ticket. Select the account and the stock position, then choose the action to sell.
- Select the order type. Choose Sell Stop, Stop, or Stop-Market, according to the label used by your firm. If the ticket offers only a generic Stop choice, open its explanation to confirm that it becomes a market order after triggering.
- Enter the quantity. Type the number of shares you want covered. Check whether the firm permits the order for the security and quantity you entered.
- Enter the stop price. This is the trigger, not a guaranteed execution price. Make sure the price is on the correct side of the current market for a sell stop and that the ticket has not interpreted it as a limit price.
- Choose the duration. A Day order generally expires at the end of that trading day’s regular hours if it has not filled. A GTC order can have a firm-defined time limit, so read the displayed expiration date and renewal policy.
- Review trigger and session details. Confirm whether the firm uses last sale or quotations, whether the order can trigger in the session you intend, and whether any extended-hours restriction applies.
- Preview and submit. Check the symbol, side, quantity, stop price, duration, estimated fees if shown, and any warnings. Submit only after the details match your plan.
- Verify the order status. Look in Open Orders or Activity for a working status and the broker’s stated expiration. Save the confirmation number or screen for your records.
This is a general workflow synthesized from SEC descriptions, not a walkthrough of a particular firm’s interface. Button names and ticket fields may differ.
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Stop-limit orders: more price control, less fill certainty
A sell stop-limit order has two prices. The stop price is the trigger. Once reached, the order becomes a limit order with the limit price you entered; it can execute only at that price or better. For a sell order, “better” normally means the limit price or a higher price.
Suppose a stock is trading at $50 and you enter a $45 stop with a $44 limit. If the trigger condition is met, the order becomes a limit order to sell at $44 or more. If the market gaps from above $45 to below $44, there may be no eligible buyer and the order can remain unfilled. You retain a price boundary but lose the execution priority of a market order.
Stop and limit prices do not have to be identical. The gap between them is a design choice with a direct trade-off: a wider range may improve the chance of a fill while allowing a lower price; a narrow range protects price more tightly but increases the chance of no execution. The SEC does not identify a universally correct gap.
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Trailing stops: a moving trigger
A trailing stop follows favorable price movement by a stated dollar amount or percentage. When the stock rises, the stop level adjusts upward according to that trail. When the price turns lower, the stop generally remains at its last adjusted level rather than moving down with it. Once the trigger is reached, the order follows the execution rules of the trailing order offered by the firm, so it still carries trigger and fill risk.
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Compare the available choices
| Choice | What happens at the trigger | Primary trade-off |
|---|---|---|
| Sell stop / stop-market | Converts to a market order. | Prioritizes an attempt to execute, but offers no guaranteed execution price and may fill far from the trigger. |
| Sell stop-limit | Converts to a limit order at the specified limit price or better. | Controls the minimum acceptable sell price, but may not execute if the market moves beyond the limit. |
| Trailing stop | The stop follows favorable movement by a selected dollar amount or percentage, then holds when movement turns adverse. | Short-term fluctuations can trigger it; calculation and trigger rules vary by firm, and execution remains uncertain. |
| Account or price alert | Sends a configured notification when the selected event occurs. | It is not an order. Available events, channels, and delivery timing depend on the firm. |
Choosing a trigger without relying on an arbitrary percentage
A stop level is a personal risk decision, not a universal formula. A fixed 5%, 10%, or other percentage can be too close for a volatile stock and too far for a less volatile one. The SEC guidance warns that short-term fluctuations can trigger a stop; it does not publish a standard threshold.
Before entering a level, write down what the order is meant to do. You might be limiting the amount of capital exposed, protecting a technical level you independently follow, or defining when your original investment thesis no longer applies. Consider the stock’s normal price movement, the position size, the liquidity you observe, and whether a brief dip would cause you to exit unnecessarily. These considerations do not predict the next price; they help you understand the consequences of the level you choose.
Calculate the dollar exposure separately from the trigger percentage. A 100-share position and a 10-share position can have the same percentage distance but very different dollar outcomes. If the potential loss is unacceptable, changing the share quantity may be more appropriate than moving the stop closer. Do not treat a stop as a guarantee of a maximum loss: gaps, fast markets, and limited liquidity can produce a worse fill.
Order duration: Day versus GTC
A Day order generally remains active during that trading day’s regular hours and expires at the end of those hours if it has not filled. “Generally” matters: the broker’s definition, treatment of partial fills, and handling around holidays or corporate actions control the result.
Good-till-canceled (GTC) is not necessarily permanent. Firms commonly impose their own maximum number of calendar days, expiration date, or renewal process. The SEC’s Understanding Order Types – Investor Bulletin notes that timing instructions and policies vary by firm. Read the expiration shown on the confirmation and set a calendar reminder to review a long-running order.
Before submitting either duration, verify whether the order can trigger in the regular session only or in another session offered by your firm. The reviewed SEC material does not establish one universal session policy, so do not infer eligibility from a different broker or from the presence of an extended-hours quote.
Broker checks to complete before you press Submit
- Order support: Does this firm support a sell stop, stop-limit, or trailing stop for this exact security and account type?
- Trigger source: Is activation based on last-sale prices, quotations, or another stated standard?
- Session: In which trading session can the order trigger and execute?
- Price fields: Does the ticket ask for one stop price or separate stop and limit prices, and how does it validate them?
- Duration: When does a Day order expire, and what is the actual GTC expiration or cancellation rule?
- Amendments: Can you change the quantity, price, or duration, or must you cancel and replace the order?
- Alerts: Are transaction, price, login, and security-change alerts available, and how are they delivered?
These checks prevent a common mistake: assuming that a familiar label guarantees familiar behavior. Keep the broker’s order-type explanation open while reviewing the ticket if the account does not display the rules clearly.
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Alert controls are separate from the trade ticket. A typical path is Settings or Profile → Alerts, Notifications, or Communication Preferences, followed by event selection and delivery settings. Your firm may use a different path.
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- Open account settings. Sign in through the firm’s official app or website and locate Alerts, Notifications, Security, or Communication Preferences.
- Choose the event. Select the available price threshold, order execution, transaction, login, failed login, password change, personal-information change, transfer, or other event that you want monitored.
- Set the condition. For a price alert, enter the symbol and threshold or direction if the feature offers those fields. A price alert is not the same as a stop trigger and does not submit an order.
- Select delivery channels. Choose email, text message, push notification, or another channel the firm supports. Confirm that the address or phone number is current.
- Save and verify. Complete any confirmation step and look for an enabled status. If the firm offers a test notification, use it; otherwise, verify the setting in the alert list.
- Review regularly. Check that alerts remain enabled after a password change, phone-number change, app update, or account transfer. Turn off obsolete symbol alerts so the list remains usable.
The SEC’s Protecting Your Online Investment Accounts from Fraud – Investor Bulletin, dated April 23, 2026, lists transaction and security-related notifications as examples. Availability and setup steps vary by firm, and electronic delivery can be delayed or filtered by a device, carrier, or email service.
Use alerts as an awareness layer, not an automated exit
A notification can help you notice an event, but it cannot ensure that you see it immediately or that the market remains at the displayed price. A text or email may arrive after a rapid move, during a network outage, or while you are unavailable. If you need a conditional trade instruction, use the order types your broker supports and understand their execution limits; do not substitute an alert for an order.
Enable security alerts even when you do not use price alerts. A notice about an unfamiliar login, failed login, password change, personal-information change, or transfer can provide an early warning that an account needs attention. Use the firm’s official contact method if an alert looks suspicious rather than clicking an unexpected link in a message.
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Market stop illustration
You own 100 shares and enter a sell stop with a $42 trigger. If the broker’s trigger rule is met, the order becomes a market order. It could fill at $41.80, $41, or another available price; the $42 figure does not cap the loss. A short-lived dip can trigger it even if the closing price later returns above $42.
Stop-limit illustration
You enter a $42 stop and a $41.50 limit. After triggering, the order can sell at $41.50 or higher. If the stock opens below $41.50 and no buyer accepts that price, the order may remain open or expire without a sale, depending on its duration.
Trailing-stop illustration
Using the SEC’s illustrative numbers, a stock at $20 has a $1 trailing amount. If it rises to a $24 peak, the trailing stop can adjust upward with the favorable movement and then hold when the price reverses. A later decline to the adjusted trigger can activate the order. The $20, $1, and $24 values are examples only, not evidence of typical market behavior.
Common problems and how to diagnose them
The order was rejected
Read the rejection reason in the ticket or Activity view. Common firm-specific causes include an unsupported order type for the security, an invalid relationship between stop and limit prices, an unavailable session, an ineligible account, or a quantity the firm cannot accept. Correct only the field identified by the broker; do not repeatedly resubmit an order you do not understand.
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This is consistent with stop-limit behavior when the market moved beyond the limit. Check whether the order is still open, partially filled, or expired. A market stop can also show a delay or partial execution in a fast or illiquid market, although it is designed to seek execution rather than enforce a price.
The stop triggered unexpectedly
Review the chart and the broker’s trigger definition. A brief intraday move, a quotation that reached the level, or a different session rule may explain the activation. Confirm whether the order was a standard stop, stop-limit, or trailing stop and whether the quantity was fully or partially covered.
The order disappeared
Check the duration and expiration timestamp. A Day order generally expires after that day’s regular hours if unfilled; a GTC order can also have a firm-set end date. Corporate actions or broker risk controls may affect an order, so read the account message and contact the firm if the status is unclear.
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An alert never arrived
Check that the alert is enabled, the symbol and condition are correct, and the delivery address or phone number is current. Review spam filters, notification permissions, carrier blocking, and app settings. Ask the firm whether the event is supported and whether delivery is immediate or subject to delay.
Managing, canceling, and reviewing an existing stop
Open the account’s Open Orders or Activity page to confirm the working quantity, trigger or limit prices, duration, and status. If the broker permits edits, use its Modify function and review the resulting confirmation. Some firms require canceling the old order and submitting a replacement; verify that the original is actually canceled before assuming the new order is active.
Revisit an order after a stock split, merger, dividend, symbol change, transfer between accounts, or a major change in your holdings. The firm may adjust, cancel, or restrict orders under its corporate-action procedures. These procedures are not uniform, so rely on the broker’s notice rather than an assumption based on another security.
What a stop order cannot do
- It cannot guarantee that the execution price equals the stop price.
- It cannot guarantee a maximum dollar or percentage loss.
- It cannot prevent a gap or rapid move from producing a materially worse fill.
- It cannot ensure execution when it is a stop-limit order and the market moves beyond the limit.
- It cannot replace a review of quantity, duration, trigger convention, and session eligibility.
- It cannot be replaced by an alert; an alert only communicates an event.
Use stops and alerts as account-management tools whose behavior you understand, not as promises about the next price or the outcome of a trade.
Frequently asked questions
Is “stop-loss” an official order type?
Brokerage tickets commonly use Sell Stop, Stop, or Stop-Market. “Stop-loss” is a popular description of the intended risk-management use, while the exact official label and rules come from the firm.
Can I set a stop and a price alert on the same shares?
Usually these are separate features, so a firm may allow both, but the account’s rules control. A stop is an order instruction; a price alert is a notification. Confirm that the alert condition and order quantity match what you intend.
What happens if the stock touches the stop for only a moment?
If the broker’s trigger condition is met, the stop can activate even during a brief intraday movement. Whether the condition uses a last sale or a quotation is firm-specific.
Does a GTC stop stay active forever?
No. GTC duration and expiration limits vary by firm. Read the expiration date shown in the order confirmation and review the order before that date.
Can a stop-limit guarantee that I will not sell below my limit?
It is designed to accept only the limit price or better, but that price protection means the order may not execute. It does not guarantee an exit.
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Do alerts work if I am logged out?
Delivery may work through email, text, or push channels while you are logged out, but availability and timing depend on the firm and your device or carrier. Keep contact details and notification permissions current.
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Should I use a fixed percentage for every stock?
No universal percentage is established by the SEC guidance. The appropriate level depends on your own objective, position size, and tolerance for short-term fluctuations; a fixed number can be unsuitable across different securities.
Where can I read the official explanations?
See the SEC’s Stop, Stop-Limit, and Trailing Stop Orders, Understanding Order Types, and Protecting Your Online Investment Accounts from Fraud bulletins. They explain the concepts and emphasize that firm policies and alert availability differ.
Frequently Asked Questions
Is “stop-loss” an official order type?
Brokerage tickets commonly use Sell Stop, Stop, or Stop-Market. “Stop-loss” is a popular description of the intended risk-management use, while the exact official label and rules come from the firm.
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Usually these are separate features, so a firm may allow both, but the account’s rules control. A stop is an order instruction; a price alert is a notification.
What happens if the stock touches the stop for only a moment?
If the broker’s trigger condition is met, the stop can activate during a brief intraday movement. Whether the condition uses a last sale or a quotation is firm-specific.
Does a GTC stop stay active forever?
No. GTC duration and expiration limits vary by firm. Read the expiration date shown in the order confirmation.
Can a stop-limit guarantee that I will not sell below my limit?
It is designed to accept only the limit price or better, but that price protection means the order may not execute.
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Delivery may work through email, text, or push channels while you are logged out, but availability and timing depend on the firm and your device or carrier.
Should I use a fixed percentage for every stock?
No universal percentage is established by the SEC guidance. A fixed number can be unsuitable across different securities.
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