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  • | What Is a Margin Call? The Hidden Risk in Stock Trading

What Is a Margin Call? The Hidden Risk in Stock Trading

Written by Corporate Secretary & Communications
Jun 16, 2026 • 5 min

What Is a Margin Call? Understanding the Hidden Risk in Stock Trading

Buying stocks with borrowed funds can increase an investor’s purchasing power. However, when stock prices move in the opposite direction and continue to decline, losses can escalate rapidly.

At a certain point, a broker may require the investor to deposit additional funds to maintain their position. This critical situation is known as a margin call. So, what exactly is a margin call, and why does it happen? In this article, we’ll explore the answers.

What Is a Margin Call?

Simply put, a margin call occurs when the value of assets in a margin account falls below the minimum requirement set by the brokerage firm. In this situation, the investor must add funds or collateral to maintain the position.

This condition arises in transactions that use margin facilities, where investors borrow funds from a securities company to purchase stocks. If the investor fails to provide additional funds as required, part of the portfolio may be liquidated to satisfy the margin requirements.

How Does a Margin Call Occur?

A margin call typically begins when an investor purchases stocks using borrowed funds provided through a margin facility. As long as stock prices move as expected, the value of the assets in the account remains sufficient to meet the required margin level.

However, when stock prices continue to decline, the value of the assets serving as collateral also decreases. If the account value falls to the maintenance margin threshold, the system or broker will issue a margin call, requiring the investor to deposit additional funds or collateral.

What Happens During a Margin Call?

When a margin call occurs, investors are generally required to promptly add cash or collateral so that the account once again meets the required margin level. In some cases, investors may also choose to sell part of their holdings to reduce risk.

If no action is taken within the specified timeframe, the brokerage firm may initiate a forced sell, automatically liquidating some or all of the investor’s positions. For this reason, investors must respond quickly to prevent losses from increasing further.

Why Is It Important to Understand Margin Calls?

If you use margin facilities, it is essential to understand how they work for several reasons:

1. Higher Risk Than Regular Investing

Borrowed funds can amplify potential returns, but they can also magnify losses. Therefore, it is important to fully understand margin-related risks before using leverage in stock trading.

2. Losses Can Escalate Quickly

When stock prices decline, both asset values and collateral levels can deteriorate rapidly. As a result, losses may grow significantly faster than they would in non-margin transactions.

3. Supports Better Risk Management

Understanding margin calls helps active traders establish risk limits and manage capital more effectively. This allows investment decisions to be made with greater discipline and control.

The Role of Securities Firms in Margin Trading

Securities companies generally provide margin facilities to support trading activities. Since a margin call is a risk that may arise when asset values decline, investors can monitor their positions and associated risks through Growin’ by Mandiri Sekuritas, enabling them to respond more quickly when market conditions change.

Leverage Can Be Profitable, but It Also Comes with Risks

A margin call is more than just a technical term in stock trading. It serves as a reminder that borrowing funds can increase profit opportunities while also magnifying losses within a short period.

For this reason, margin trading should always be accompanied by a solid understanding of leverage and disciplined risk management practices. Monitor market movements and make investment decisions with greater confidence through Growin’ by Mandiri Sekuritas.


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