Margin Calls in a Crash: Can You Fight a Sale Without Notice?

A collateral shortfall of 1 million won can trigger the forced sale of more than 6 million won in stock. This is forced liquidation — known in Korea as bandae-maemae, the compulsory sale of a margin investor's shares regardless of their wishes once collateral runs short. And it is no exaggeration: in the example printed in Shinhan Securities' own margin trading disclosure, the amount liquidated comes to 6.7 times the collateral shortfall. It is happening against a grim backdrop — this June the KOSPI suffered repeated intraday drops of more than 8%, triggering the circuit breaker (a mechanism that halts all trading when prices move sharply) three times, while, according to media reports, the KOSPI margin lending balance hit a record 28 trillion won, with the total including the KOSDAQ market reaching roughly 37.7 trillion won. Forced liquidation, however, is a predictable procedure. If you know the timeline and the math, you can respond — and if the procedure was flawed, there are points worth contesting.

If the Margin Call Just Arrived — Three Things to Do Today

First, check the shortfall amount and the deadline. Your broker's mobile trading app shows the collateral shortfall on the margin or loan screen. Under standard brokerage disclosures, the deadline runs about two business days including the demand date — meaning the business day after you are notified is effectively your last chance, and the forced sale executes the following trading day at the market open.

Second, cover the shortfall within the deadline. There are two ways: deposit cash, or sell some of your holdings yourself. Selling directly often reduces the total sold, because you sell at actual market prices for exactly the amount needed, whereas a forced sale calculates quantities from a deeply discounted reference price. Either way, the collateral ratio must recover before the forced sale executes — and which point in time your broker uses for valuation is something to confirm in your account terms.

Third, preserve the records. Save the notice (screenshot the text or app alert), the shortfall calculation details, and the execution records now. If the notice never arrived or the procedure departed from the terms, these records become the only basis for a dispute — the legal issues are covered below.

The 140% Collateral Rule — Where Is Your Danger Price?

It is far better to know your account's danger price before the notice arrives. Article 4-25 of the Financial Investment Business Regulation, a regulatory notice issued by Korea's Financial Services Commission, requires brokerages to secure collateral worth at least 140% of the credit extended, and this 140% serves in practice as the baseline collateral maintenance ratio (the value of your account relative to the margin loan). From this comes a simple formula for the price at which the margin call begins:

Danger price = 1.4 × margin loan ÷ number of shares held

Suppose you bought 10,000 shares of a 10,000-won stock — 100 million won in total — with 40 million won of your own money plus a 60 million won margin loan. Your danger price is 1.4 × 60,000,000 ÷ 10,000 = 8,400 won. A 16% drop puts you at the boundary. At that point your account is worth 84 million won, but subtract the 60 million won loan and your own equity has shrunk from 40 million to 24 million won — a 40% loss on principal. The collateral ratio collapses faster than the losses you feel. Brokers may require a ratio higher than 140% depending on the stock and account, so check your account's exact figure and plug it into the formula.

Every Broker Sells Differently — A Comparison

The broad framework is the same, but execution differs by brokerage. Drawing only on what each firm's margin trading disclosure states:

The "opening auction" in the table is the session that pools orders before the market opens and executes them at a single price. The method of notice is also prescribed: under Korea Investment & Securities' disclosure, the demand must be made by pre-agreed text or e-mail, content-certified mail (a Korean postal service that officially certifies a letter's contents and the date it was sent), or a recorded call — any method by which "the fact of the demand can be proven" — and Article 4-25(7) of the Financial Investment Business Regulation prescribes the same. The table reflects each firm's disclosure and may vary by account type and stock, so the safe move is to confirm your own terms in the app.

Forced Liquidation: Why Far More Gets Sold Than the Shortfall

The 6.7-times figure in the opening comes from the mechanics. When calculating how many shares to sell, brokers do not use the previous closing price — they use a price discounted by 15–20% or the daily lower limit, as the table shows, and submit the order under conditions that all but guarantee execution, such as a market order or a lower-limit order. The quantity is worked backwards conservatively so that the collateral ratio recovers even if the sale fills at that discounted reference price. Shinhan's disclosure goes further, warning that if the order fills at the daily lower limit, the proceeds may still not fully cover the shortfall.

The numbers make the gap concrete. To cover a 10 million won shortfall by selling a stock that closed at 10,000 won, 1,000 shares would seem sufficient. But set the reference price at 8,500 won — a 15% discount — and the required quantity rises to about 1,176 shares, growing further once the ratio to be restored is factored in. If the actual fill price comes in above the reference price, more ends up sold than was strictly necessary. This is why selling the shares yourself can beat waiting for the forced sale.

The forced selling also feeds back into the market. According to a Newsis report, on June 8 the KOSPI closed 8.29% lower at 7,484.41, and by Alpha Economy's tally, forced liquidations tied to unsettled credit purchases alone reached 305.2 billion won over two days. Forced sales press prices down, and the decline pushes yet more accounts into shortfall — the chain reaction of a crash.

If You Never Received Notice — Is There a Legal Case?

Forced liquidation itself is a legitimate exercise of contractual rights under the margin agreement the investor signed. Article 72 of the Financial Investment Services and Capital Markets Act permits broker-dealers to extend credit to investors through loans of money and similar methods, delegating the standards and procedures to subordinate regulations, and forced liquidation is the enforcement of collateral rights under that credit agreement. The bare fact that you were liquidated gives you nothing to contest.

The legal issues arise from procedure. The first is notice. Because the rules require a method by which the demand can be proven, if the notice went to a phone number or address not registered with the brokerage — or the sale proceeded with no notice at all — there may be grounds for a damages claim based on breach of contract or tort. In practice, however, courts apply comparative negligence (reducing the award by the victim's share of fault) where, for example, the investor neglected to update their contact information, so a defective notice does not automatically translate into full compensation.

The second is the line between forced liquidation and unauthorized trading — a sale that departs from the procedure in the terms altogether. If the brokerage sold when there was no shortfall, or sold before the deadline had passed, the problem is no longer forced liquidation but unauthorized disposition. In a case involving unauthorized trading by a brokerage employee, the Supreme Court of Korea held that a customer's failure to immediately assert a damages claim cannot, by itself, be treated as implied ratification of the trade (Supreme Court, October 11, 2002, Case No. 2001Da59217). A delayed objection does not automatically close the door.

Disputes are won or lost mostly on one factual question — whether the procedure followed the terms. That is why the third action in the first section, preserving the records, matters. If the procedure was lawful, the loss belongs to investment risk; only if it was defective does the law come into play.

If You Decide to Fight — Free First Steps

If you believe the procedure was flawed, you do not need to go straight to court. The first stop is financial dispute mediation at the Financial Supervisory Service (FSS), Korea's financial watchdog. Under Article 36 of Korea's Financial Consumer Protection Act, anyone involved in a financial dispute can apply for mediation with the FSS, and the process is free. Applications can be filed online through the FSS e-Financial Complaint Center, or by mail or in person.

The process runs as follows. Once an application is filed, the FSS first encourages the two sides to settle; if no settlement is reached within 30 days of the application, the case is referred to the Financial Dispute Mediation Committee. The committee must produce a mediation proposal within 60 days of referral, and if both sides accept it, the dispute is resolved. If either side rejects it, a civil lawsuit becomes the next option to consider.

There is also a clock running. A damages claim based on tort expires three years after the victim becomes aware of the harm and the wrongdoer (Article 766 of the Korean Civil Act). Since you usually learn of a forced liquidation the day it happens, three years from the sale date is, in practice, your window to act. The period can differ depending on the legal basis of the claim, so if the deadline is close, have a professional confirm it.

As for what to prepare — exactly the records you secured in the first section: the notice records, the shortfall calculation details, the execution records, and your account terms. Those four are enough to complete a mediation application.

Before the Notice Comes — Three Preventive Checks

If you still have room, check three things today. Run the formula above on each holding to see how far the current price sits from your danger price. Confirm that the phone number registered with your brokerage and your alert settings are actually live — miss the notice and you lose the chance to respond at all. And remember that buying more of the same stock to plug a shortfall — averaging down — can compound the risk when you are already leveraged.

In a crash unfolding on top of a record margin lending balance, forced liquidation is not an unpredictable disaster but a foreseeable procedure. Know the math of your danger price, keep your notice channels in order, and preserve the procedural records — the minimum safeguards a leveraged investor has.