How to Read Korea’s 5% Rule Beyond the Filing Deadline

The filing deadline is the easy part of Korea’s 5% rule, and our hub on Korea’s corporate disclosure system already maps it. What catches foreign funds sits one level down: whose shares get added to yours, what counts as “holding,” what a filing locks you out of, and what a wrong or late one costs. The answers below come from the statute and the Financial Supervisory Service’s (FSS) own filing guide; the hub has the deadline table.

Key Takeaways

• The 5% test isn’t run on your fund alone. Korea’s Financial Investment Services and Capital Markets Act (FSCMA) adds your holdings to those of your “specially related persons”: related persons and anyone you’ve agreed to act with. A manager’s own account and its client accounts are added together too.
• “Holding” is wider than owning. The Enforcement Decree counts a right to delivery, a power to direct votes, a power to buy or sell on someone else’s behalf, and option-type derivative rights. It doesn’t name swaps, and I found no regulator guidance on cash-settled ones.
• A management-influence filing comes with a cooling-off window. From the day the duty to report arose until five days after you file, you can’t buy more of the stock or vote the shares you hold.
• A late or false filing stacks consequences. A voting ban on the excess stake that can run six months past the filing, a disposal order of up to six months, a surcharge of up to 1/10,000 of market capitalization (capped at ₩500 million, about $369,000), and criminal penalties of up to three years for not filing.
• Asking is not the same as campaigning. On March 6, 2026, the Financial Services Commission (FSC) said that demanding treasury-share cancellation, or asking about dividends or executive pay, isn’t a management-influence purpose. A shareholder proposal on directors, or a proxy solicitation, still is.

Contents

1. Whose shares count toward your 5%
2. What counts as holding
3. The cooling-off window
4. Which actions trigger a purpose-change report
5. What a late or wrong filing costs
6. A pending bill, and what it would change
7. Where funds trip
8. Frequently asked questions

Currency note: won figures carry a dollar conversion at $1 = ₩1,355, the approximate XE.com mid-market rate used in the hub as of September 26, 2026. Rates move, so treat conversions as approximate.

1. Whose shares count toward your 5%

Article 147 of the FSCMA doesn’t ask whether your fund holds 5%. It asks whether you and your specially related persons hold 5% together. The Enforcement Decree (Article 141) splits that group in two: related persons and joint holders.

Related persons. For a corporate holder, the Decree borrows the definition from the governance decree for financial companies. It covers the holder’s officers, its affiliates under the Fair Trade Act and their officers, and entities tied to it by ownership of 30% or more or by de facto influence over major management decisions. The FSS guide adds a detail that surprises people: unregistered executives aren’t related persons, though they can still be joint holders.

Joint holders. This is the group you create yourself. You become a joint holder with anyone you’ve agreed with, by contract or otherwise, to do any of three things:

• acquire or dispose of the shares together;
• acquire them and then transfer them to each other;
• exercise voting rights together, including a power to direct how votes are cast.

The FSS adds two rules that matter in practice. If the agreement covers only part of the other party’s shares, the whole of their stake is still added to yours. And when a two-way related party joins or leaves your group, you owe a change report even if the combined stake moved by less than 1%.

The way out. A related person with fewer than 1,000 shares, or one who proves it is not a joint holder, is not counted (Decree Article 141(3)). The word is “proves.” The FSS names a fight over control, litigation between the parties, and a formal split under the Fair Trade Act as examples, where every related person confirms there is no joint holding. For fund managers, it describes a control set it will accept as proof: information barriers, a written confirmation that the fund is not a joint holder with any of the related persons, and specific voting guidelines the fund follows when it trades and votes. It adds that funds face “strict” proof. A manager that also holds shares for its own account has to add that stake to its client holdings. Nothing in the FSS guide excuses the proprietary book.

Who files? Everyone in a group above 5% is a reporting person. The holder with the largest stake can file for all of them as representatives, with powers of attorney attached to the first joint filing. One filing, one name on top. The obligation still belongs to each person in the group.

Here’s the collaboration problem. The Decree’s test is an agreement to act together, not a conversation. But a fund-house lawyer quoted by Newstomato on August 6, 2026, said that even asking other institutions for their views can be read as joint holding, so compliance teams all but rule out the conversation. A finding of joint holding drags every member’s trades into one report and puts a missed filing in criminal territory (Newstomato, August 6, 2026). Assume that caution is warranted until the rule changes.

If the holder is a chaebol-linked company (chaebol are Korea’s family-controlled conglomerate groups), the related-person test is the same affiliate map we walk through in our piece on chaebol governance.

2. What counts as holding

Two definitions decide what goes into the numerator, and a third decides the denominator.

Which securities? The reportable “stock etc.” (Decree Article 139) is wider than common shares. It covers listed shares, warrants, convertible bonds, bonds with warrants, exchangeable bonds, depositary receipts, and derivative-linked securities, the last only if exercising them can deliver the underlying stock.

Holding versus owning. Decree Article 142 treats seven situations as holding. Together they reach:

• shares owned for your own account, whatever name they’re registered in;
• a contractual right to delivery of the shares;
• voting rights, or a power to direct how they’re voted, under a trust, collateral, or other contract;
• a power to buy or sell the shares, under a trust, collateral, or discretionary mandate;
• a one-sided purchase option you can complete;
• an option-style derivative right that makes you the buyer when you exercise it;
• stock options.

The FSS guide gives worked examples. Acquiring a call option on a convertible bond is itself holding, counted at the number of shares the conversion would deliver. A right of first refusal becomes reportable when the holder says it will buy. A borrower of shares owns them and reports the change, while a lender whose purpose is not simple investment reports a change in the form of its holding and in its contracts.

The denominator. The ministry rule that sets the arithmetic (Enforcement Rule Article 17) divides by all voting shares outstanding, treasury shares included, plus the shares your group would receive if its convertibles and similar securities were exercised. Your own convertibles lift the numerator and the denominator together.

Swaps are the open question. The FSCMA defines derivatives in several categories. Decree Article 142 names only the option-style category. Swaps sit in a different category and don’t appear by name. That doesn’t make them invisible, because the other limbs of Article 142 look at rights rather than labels: a delivery claim, a power to direct votes, and a power to decide what happens to the hedge shares. A cash-settled swap that confers none of those fits the text poorly. But I found no FSS or FSC guidance on the point, and the one episode I found cuts against complacency. The Korean press reported that in February 2016 the authorities concluded Elliott Management had breached the 5% rule by building its 2015 Samsung C&T position partly through total return swaps. The Seoul Southern District Prosecutors’ Office decided on June 29, 2020, not to indict, saying there was no evidence for the charges (Asia Business Daily). Read that as a warning about scrutiny. It settled nothing about swaps.

If a loan, pledge, or option contract covers 1% or more of the shares and your purpose isn’t a simple investment, the contract itself becomes a reportable item (Decree Article 155). Whether a swap counts as a major contract of that kind is another point I couldn’t confirm.

3. The cooling-off window

The cooling-off period is one of the rule’s least-known features. FSCMA Article 150(2) says that anyone who files stating a management-influence purpose can’t buy more of that company’s shares and can’t vote the shares they hold from the date the duty to report arose until five days after the filing. Because the Act reaches any filing that states a management-influence purpose, the window covers a new filing and a switch from simple or general investment alike. The FSS guide’s own example is the simple-investment switch. Its comparison of purposes marks the window as applying to management influence only. General and simple investment are outside it.

Two consequences follow. First, a late filing stretches the window. The clock starts when the duty arises, not when you file, so every day of delay is a day you’re frozen. Second, timing matters around shareholder meetings. If you plan to turn an engagement into a formal campaign, a change of purpose filed shortly before the vote can switch off your votes at exactly the moment you want them.

A purchase made inside the window carries its own penalty: no voting rights on the additional shares, and the FSC may order those shares disposed of within a period of up to six months (Article 150(3)).

As I read the Act, “five days” here is counted the way the filing deadline is, without Saturdays, public holidays, and Labor Day. The hub explains that counting.

4. Which actions trigger a purpose-change report

Three purposes exist, and the Decree defines them by what you do rather than what you intend. Management influence means exerting de facto influence on the company or its officers over a listed set of matters (Decree Article 154(1)): electing or removing officers, amending articles on the board and other organs, changing capital, mergers and spin-offs, share exchanges, business transfers, major asset sales, business leases, and dissolution. Exercising the shareholder proposal and meeting-convening rights in the Commercial Act counts, as does soliciting proxies under FSCMA Article 152. Merely conveying an opinion or stating a position publicly doesn’t. Simple investment means exercising only rights guaranteed by law regardless of how many shares you hold: voting, pre-emptive rights, and dividends. General investment is whatever falls outside those two. The three-way split dates from the Decree amendment that took effect on February 1, 2020.

The FSS guide lists a change among the three purposes as a reportable event, due within five business days. The table applies those definitions. The “likely tier” column is my reading where the sources don’t say.

What you do	Management influence?	Likely tier	Basis
Vote on agenda items at the meeting	No	Simple investment	FSS guide: merely voting is not management influence
Ask the company to disclose agenda items early or explain them in detail	No, unless the request comes with an articles amendment on the board or other organs	General investment	FSC interpretation, March 6, 2026
Demand cancellation of treasury shares, or ask the company to carry out an approved treasury-share plan	No	General investment	FSC interpretation, March 6, 2026
Press for dividend predictability or an annual dividend policy notice	No; dividend items left the Decree’s list in the January 2020 amendment, per the FSC	General investment	FSC release, March 6, 2026
Ask for an explanation of executive pay, or send a position letter on it	No	General investment	FSC release, March 6, 2026
Publish a letter that only states your view	Not by itself	General investment	Decree Article 154(1) excludes merely conveying opinions
Use minority rights to seek a director’s removal after wrongdoing, or to stop an illegal act	No (carved out by the Decree)	General investment	Decree Article 154(1); Commercial Act Arts. 385(2) and 402
File a shareholder proposal to elect or remove directors, or demand an extraordinary meeting	Yes	Management influence	Decree Article 154(1)
Solicit proxies from other shareholders	Yes	Management influence	Decree Article 154(1) names Article 152 solicitation
Propose an articles amendment on board composition	Yes, with an exception for state, local-government and Bank of Korea holders and FSC-notified holders who follow principles they published in advance	Management influence	Decree Article 154(1)
Lend, pledge or write an option over 1% or more of the shares	Not a purpose change	Unchanged	Separate contract-change report unless you filed as simple (Decree Article 155)

Two cautions on the interpretation rows. They’re an FSC reading and leave the Decree’s text untouched, and the FSC itself qualified the first with “unless there are special circumstances.” And the March 2026 release doesn’t say whether these activities sit in the general or the simple tier. Because simple investment is limited to statutory rights, I read them as general investment. If you filed as simple, that move is itself a change in a reportable item.

Special investors. The FSC’s March 2026 chart gives public pension funds their own column, and the Decree gives the state, local governments, the Bank of Korea and FSC-notified holders relaxed schedules. The hub explains those schedules. The FSC notice that fills the “notified holders” category (Article 3-14 of the securities issuance and disclosure regulation) cross-references the Decree’s professional-investor list. It reaches items such as securities finance companies, certain public financial institutions and exchange bodies, and funds established by law with their managers. It skips collective investment schemes and the entries covering foreign governments, central banks and foreign counterparts. On that text I found no basis for a foreign pension fund or asset manager to assume it qualifies, and I found no FSS ruling saying one does. For how Korea’s own largest public fund approaches stewardship, see our look at the National Pension Service.

Which form, in which direction. Moving from management influence or general investment to simple investment takes the short form, plus a confirmation that you’ll do nothing beyond exercising statutory rights. Moving from general or simple investment to management influence takes the full form, which states your plans. A filer with a management-influence purpose but no concrete plan yet can file without details, then has to correct the filing when a plan forms. Once plans exist, the FSS wants specifics, not a copy of the Decree’s list. The FSC’s August 19, 2022 release introduced that detail requirement through form and guidance changes rather than new law (FSC release).

Don’t mislabel. The FSS warns that reporting a false purpose can bring disposal orders and voting bans. The purpose line isn’t a formality.

5. What a late or wrong filing costs

These consequences come from different provisions and different decisions, so they can stack.

Consequence	Provision	What it says
Voting ban	FSCMA Art. 150(1); Decree Art. 158	No voting on the violating part of the stake above 5% of voting shares. For intent or gross negligence, the ban runs from the purchase date to six months after the (corrected) filing. For certain excusable errors, it ends on the filing date.
Disposal order	FSCMA Art. 150(1)	The FSC may order the violating part sold within a period it sets, up to six months.
Cooling-off breach	FSCMA Art. 150(2)-(3)	No voting on shares bought during the window, plus a possible disposal order.
Administrative measures	FSCMA Art. 151(2); Decree Art. 159	A correction order, a suspension or prohibition of trades, a recommendation to dismiss officers, referral to prosecutors, a warning or caution.
Surcharge	FSCMA Art. 429(4)	Up to 1/10,000 of the company’s market capitalization, capped at ₩500 million (about $369,000), for not filing or for a false or missing material item.
Criminal: failure to file	FSCMA Art. 445	Up to three years in prison or a fine up to ₩100 million (about $74,000).
Criminal: false or missing material item	FSCMA Art. 444	Up to five years in prison or a fine up to ₩200 million (about $148,000).
Criminal: ignoring a disposal order	FSCMA Art. 446	Up to one year in prison or a fine up to ₩30 million (about $22,100).
Entity liability	FSCMA Art. 448	The firm can face the fine when an employee violates in the course of its business, unless it took reasonable care and supervision.

Three details change how you read that table.

The surcharge is a ceiling. The statute says the FSC “may” impose up to the cap. The 1/10,000 ratio rose tenfold from 1/100,000 under an FSCMA amendment promulgated on January 21, 2025 (Shin & Kim summary), and the FSS guide dates the higher limit from July 22, 2025. Do the arithmetic: ₩500 million divided by 1/10,000 is ₩5 trillion, so for any company with a market capitalization above that (about $3.7 billion), the cap binds. A company worth ₩2 trillion (about $1.5 billion) would carry a ceiling of ₩200 million (about $148,000). The Decree sets how market capitalization is calculated, and I haven’t traced that method, so treat these as illustrations of the ceiling only. The English translation on the Korea Legislation Research Institute’s site, as I opened it, ends with 2018 amendments and still shows the old ratio, so don’t quote the surcharge from there.

The clock on surcharges is five years. The FSC can’t impose one more than five years after the violation (Article 429(6)).

A voting ban outlasts the fix. For intent or gross negligence, correcting the filing doesn’t end the ban. It runs six months from that corrected filing. A report filed late on March 10 keeps the ban running until September 10 of the same year, if the miss is treated as intentional or grossly negligent.

6. A pending bill, and what it would change

Several of the pressure points above are the ones a bill reported in the Korean press is aimed at. The Newstomato news site wrote on August 18, 2026 that Democratic Party lawmaker Park Hong-bae had introduced an FSCMA amendment that would write the joint-holder test into the statute, exclude public proxy solicitations under Article 152 from it, and reword the management-influence test as exercising de facto control over major management matters (Newstomato). Business groups quoted by the Korea Economic Daily warned that it could make hostile takeovers easier (Hankyung, August 6, 2026).

A bill is not law. I haven’t been able to confirm the bill’s current status with the National Assembly, so nothing in the sections above depends on it. Check the status before you rely on either the old rules or the proposed ones.

7. Where funds trip

Your own fund is only part of the count. Your affiliates, your joint-holder agreements and your manager’s own book all feed the 5% test. Run the aggregation before you cross.

Derivatives and loans belong in the filing. An option that makes you the buyer on exercise, a power to direct votes, and a share loan or pledge all show up in the report. Swaps are unsettled, which is a reason to ask first.

Does a late filing cure the breach? No. The filing stops the clock on the filing duty. It doesn’t end a voting ban running six months past it, and the surcharge window stays open for five years from the violation.

“Engagement” can cross the line. Asking about treasury shares, dividends or pay is outside management influence. Nominating directors, convening a meeting or soliciting proxies isn’t. The line is drawn by what you do, and mislabeling the purpose is itself a sanctionable misstatement.

8. Frequently asked questions

Does a cash-settled equity swap count toward my 5%? The text doesn’t say. Decree Article 142 names option-style derivative rights but not swaps, and I found no guidance on cash-settled ones. The rights the contract gives you decide the question. Take advice before building a position this way.

Can I discuss a shareholder proposal with other funds? The Decree’s test is an agreement to acquire, transfer or vote together, including a power to direct votes. Exchanging views isn’t listed. Compliance teams still treat the line as blurry, and a finding of joint holding aggregates everyone’s shares. Agree nothing about votes or trades before you’ve checked the aggregation.

Does asking a company to cancel its treasury shares force a management-influence filing? No. The FSC’s interpretation of March 6, 2026 says demanding cancellation, or asking the company to carry out a shareholder-approved treasury-share plan, isn’t a management-influence purpose. The Decree itself is unchanged.

What happens if I move from passive to management influence? You file a change report on the full form that states your plans, and the cooling-off window applies: no more purchases and no voting until five days after the filing. The purpose-change deadline is five business days under the FSS guide.

Is the surcharge a flat fine? No. It’s a discretionary ceiling of 1/10,000 of market capitalization, capped at ₩500 million. Criminal penalties are separate.

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Last updated: October 5, 2026

Disclaimer: This article is for general informational purposes only and does not constitute investment, legal, or tax advice. It reflects the FSCMA, its Enforcement Decree and Enforcement Rule, and FSC and FSS materials in the versions in force on October 2, 2026, which can change without notice. Whether a particular holding, agreement or derivative triggers a report depends on facts we can’t assess. Confirm your position with Korean qualified counsel and the FSS before making any filing or investment decision. Seoul Market Brief does not recommend any specific security, fund, or transaction.