Part 6 · Reading disclosures beyond the numbers · Lesson 32
Largest shareholder and 5% stake disclosures
Read from disclosures who owns how much of the company and when those stakes moved.
QToday's question
Why does everyone tense up when news says a company's CEO has sold shares in his own company?
If the people who know a company best are buying and selling its shares, that itself can be a signal. That's why the law requires large shareholders and insiders to disclose when they change their stakes. In this lesson, you'll learn how to read who owns the company.
MAPLearning map for this lesson
We build it up in three steps. At the end of each step, a 'Quick check' lets you test your understanding before moving on.
In Lesson 5 you saw that Chapter VII of the business report is 'Shareholders', and in Lesson 2 that ownership disclosures are one of the DART disclosure types. In Lesson 31 you calculated how rights offerings and CB conversions lower existing shareholders' ownership percentages. This lesson reads who holds those stakes. For what foreign ownership means, also see Learn (Economics) Lesson 27.
- STEP 1 · Basic conceptsWho owns the company
Read the ownership structure split into the and related parties, institutions, foreign investors, and minority shareholders.
- STEP 2 · Understanding how it worksThe 5% rule and insider disclosures
Explain the filing deadline and holding-purpose differences of the , executive and major shareholder disclosures, and the pre-disclosure system.
- STEP 3 · Real-world applicationReading ownership disclosure titles
From the title of an ownership disclosure alone, you can tell what changed and what else needs checking.
STEP 1Who owns the company
Just as an apartment complex has a residents' representative, a company has a shareholder with the most votes. Who that is, and how much they hold, shapes the company's direction.
Largest shareholder and related parties
The is the shareholder who owns the most shares of the company. However, disclosures show not just the largest shareholder alone but the combined stake of related parties close to the largest shareholder, such as family, affiliates, and company executives. This is because control of the company is ultimately protected by this 'single block' of shares.
In the annual report, VII. Shareholders presents, in order, the share ownership of the largest shareholder and related parties, changes in the largest shareholder, holders of 5% or more, and minority shareholders. This is the chapter we called 'short but heavy' in Lesson 5.
Robin Bakery's ownership map
Here is how Robin Bakery's (fictional) 2 million issued shares are divided among owners. Founder and CEO Robin Kim holds 700,000 shares (35%), and related parties such as family and executives hold 200,000 shares (10%), for a total of 45%. Institutional investors hold 12%, foreign investors 8%, and the remaining 35% is split among many minority shareholders.
Ownership structure chart · Robin Bakery (fictional), 2 million issued shares Tap a slice to see the filings related to that shareholder.
All numbers are based on a fictional company for educational purposes. Within the 12% held by institutions is a fictional asset manager, 'Pureun Asset Management' (5.4%), which holds more than 5%.
If the largest shareholder's side holds 45%, it is hard for other shareholders to seize control even if they join forces. Conversely, if the largest shareholder's stake is low, in the 10% range, control can be shaken with relatively little money, so each ownership disclosure has a big impact on the share price. What foreign ownership of Korean stocks means for the overall market continues in .
Quick checkIf Robin Bakery issues 400,000 new shares to a third party (Lesson 31), what percentage would the largest shareholder side's 900,000 shares represent?
STEP 2The 5% rule and insider filings
If a large investor quietly accumulates shares, the owner of a company can change without other shareholders knowing. That is why the rules require disclosure once a certain percentage is crossed.
The 5% rule: large shareholding report
Anyone who comes to hold 5% or more of a listed company's shares (including securities that can turn into shares, such as convertible bonds), together with related parties, must file a . After that, they must report again if the holding ratio changes by 1% or more, or if the holding purpose or an important contract such as a collateral or trust arrangement changes. It is commonly called the '5% rule'.
Three holding purposes
| Meaning | How to read it | |
|---|---|---|
| Influence on management control | A purpose of influencing company management, such as appointing directors or amending the articles of incorporation | Reported on the detailed general form, with a cooling-off period during which additional purchases and exercising voting rights are prohibited until 5 days after the report. It can be a signal of a management control dispute. |
| General investment | Not aimed at management control, but the holder may demand things such as dividends or better governance | A short form, but it lists major contracts and how the funds were raised. It can be an advance notice of shareholder activism. |
| Passive investment | Purely for investment returns | Pension funds and asset managers often file for this purpose. Change reports are due by the 10th of the following month, so they reflect changes with a delay. |
Suppose Robin Bakery's 'Pureun Asset Management' (fictional) first bought 5.4% and filed for passive investment purposes, and a few months later changed its holding purpose to influence on management control and filed again. The meaning would be completely different. The purpose field comes before the numbers.
Insider ownership reports and pre-disclosure
Company executives and major shareholders (holders of 10% or more) file an even if they buy or sell just one share of their own company. If the 5% rule is a system for watching 'changes in control', this report is a system for watching 'insider trading activity'.
Since July 24, 2024, the has been added. When executives and major shareholders want to buy or sell 1% or more of total issued shares or KRW 5 billion or more in aggregate over the past six months, they must disclose the purpose, amount, and period of the trade at least 30 days before the trade begins (Financial Services Commission press release, 2024-07-09). The market can now know in advance before a CEO sells in large volume.
Common misconceptions
- "If a major shareholder sells, it's always bad news?"
- There are many reasons unrelated to company performance, such as paying inheritance tax, repaying a secured loan, or donating to a charitable foundation. Check the 'purpose of transaction' field in the pre-disclosure and the size of the sale first.
- "If a 5% report appears, that person has just bought?"
- Because of the filing deadline, there can be a gap of several days between the actual trade and the disclosure, and for passive-investment change reports up to over a month. Check the 'date of change.'
- "If foreign investors or institutions pass 5%, they are going after control?"
- Pension funds and asset managers mostly file for passive investment purposes. Don't judge until you have checked the holding purpose.
Quick checkA fund held 4.8% and bought another 0.5%, reaching 5.3%. Does it have to file a report?
STEP 3Reading ownership filing titles
With ownership filings, the title alone tells you roughly what happened. Let's practice deciding where to look next from the title.
The story of Dark Cloud Electronics' largest shareholder
Dark Cloud Electronics (fictional) had 1 million issued shares, of which the largest shareholder held 320,000 shares (32%). But as we saw in Lesson 31, if the KRW 6 billion CB is fully converted into shares at a conversion price of KRW 5,000, the share count becomes 2.2 million. Even if the largest shareholder sells nothing, the ownership ratio falls to 320,000 ÷ 2.2 million ≈ 14.5%. If a fictional investment partnership that bought the CB and converted it into shares ends up holding more than 15%, a title reading 'Change of largest shareholder' will appear in the filing list.
A change of largest shareholder is not bad in itself. But if CB conversions and largest-shareholder changes repeat within a short period at a loss-making company, it is an item for the red flag checklist in Lesson 34.
Ownership filing classification practice · 6 fictional filing titles Read each title and pick the most suitable interpretation.
The filing titles are fictional examples based on real form names. All company names are fictional.
Find it yourself on DART
As in Lesson 3, search for a company and select Ownership disclosure as the filing type, and large shareholding reports and insider ownership reports of executives and major shareholders appear in date order. The largest shareholder's stake is checked in the table 'Shares held by the largest shareholder and related parties' in the annual report's VII. Shareholders. Disclosures such as a 'change of largest shareholder' or those in the nature of pre-disclosure also appear in exchange disclosures ().
How to use it in investing
| What the filing shows | First check |
|---|---|
| Largest shareholder side's stake below 20% | Whether control could be shaken, and what the holding purpose of other holders of 5% or more is |
| Holding purpose changed from passive investment to influence on management control | Next filings, such as shareholder meeting agenda items or demands to appoint directors |
| Pre-disclosure of a large sale by executives or major shareholders | Purpose of the transaction, what percentage of issued shares the sale represents, and the selling period |
| Repeated changes of largest shareholder in a short period | CB conversion history (Lesson 31), operating cash flow (Lesson 21), audit opinion (Lesson 30) |
| Foreign or institutional ownership steadily rising or falling | Supply and demand flows together with changes in the earnings outlook |
Not always. Ownership filings only tell you 'who did what'; they do not tell you why or what the result will be. They only gain meaning when read together with the holding purpose, the purpose of the transaction and other financial numbers. This is educational material and does not recommend buying or selling any particular stock.
Quick checkThe CEO has pre-disclosed that he will sell 2% of issued shares over 3 months for the purpose of 'paying inheritance tax.' What should you look at first?
✓What we learned today
- Read the ownership structure in four groups: largest shareholder and related parties / holders of 5% or more / institutions and foreign investors / minority shareholders. Robin Bakery (fictional) has its largest shareholder and related parties holding 45%, so control is stable.
- Anyone who comes to hold 5% or more of a listed company's shares, whose holding later changes by 1% or more, or whose holding purpose changes, must in principle report within 5 business days (the 5% rule).
- There are three holding purposes: influence on management control · general investment · passive investment. For influence on management control, the form is more detailed and a cooling-off period applies, so it can be read as a signal of an ownership battle.
- Executives and major shareholders file an ownership report when they buy or sell shares of their own company, and since July 24, 2024, they must pre-disclose 30 days in advance if they want to trade 1% or more of issued shares or KRW 5 billion or more.
- Like Dark Cloud Electronics (fictional), when CB conversion cuts the largest shareholder's stake from 32% to about 14.5% and the largest shareholder changes often, it is a signal to question the continuity of management.
Now that you have seen who holds the shares, it's time to look at how reliable the numbers the company reports are. The next lesson covers preliminary results, which come out before the annual report, and corrected filings, which amend filings already submitted.
Quiz5-question quiz
Pick an answer and it's graded right away with an explanation.
Q1. What is the standard filing deadline when you first come to hold 5% or more of a listed company's shares?
The rule is within 5 business days from the day after the reportable event occurs. Only 'change reports' for passive investment purposes are due by the 10th of the following month.
Q2. In a 5% report, which holding purpose triggers a cooling-off period during which additional purchases and exercising voting rights are prohibited for a set time after the report?
The cooling-off period applies only for influence on management control. It means this is a report that may be related to a management control dispute.
Q3. Which of the following correctly describes the insider trading pre-disclosure system in effect since July 24, 2024?
To trade 1% or more of issued shares or KRW 5 billion or more on a combined basis over the past 6 months, executives and major shareholders must disclose the purpose, amount and period at least 30 days in advance.
Q4. Dark Cloud Electronics' (fictional) largest shareholder still holds 320,000 shares, but CB conversion has raised the share count from 1 million to 2.2 million. What is the largest shareholder's ownership ratio?
320,000 ÷ 2.2 million ≈ 14.5%. Even if you don't sell shares, your control can weaken when the share count grows.
Q5. An asset manager has filed a change of its holding purpose from 'passive investment' to 'influence on management control.' What is the most appropriate interpretation?
A change of holding purpose can be an advance notice of actions such as proposing shareholder meeting agenda items or demanding the appointment of directors. Look at the next filings and the meeting agenda together.
NextTerms · Next lesson · Related tools
The shareholder who owns the most shares of a company. In filings, the stakes of related parties such as family, affiliates and executives are combined and shown as the stake of the 'largest shareholder and related parties,' which appears in the annual report under VII. Shareholders.
Large shareholding report (5% rule)Large shareholding report (5% rule)A system under which you must in principle report within 5 business days when you come to hold 5% or more of a listed company's shares together with related parties, when your holding later changes by 1% or more, or when your holding purpose or similar details change (Financial Investment Services and Capital Markets Act, Article 147).
Holding purposeHolding purposeThe purpose of holding shares, declared in a 5% report, divided into influence on management control, general investment and passive investment. For influence on management control, the report is filed on the general form and a cooling-off period applies. Change reports for passive investment are due by the 10th of the following month, and those for general investment within 10 business days.
Insider ownership reportInsider ownership reportA filing in which executives and major shareholders of a listed company report their holdings of their own company's shares and changes in them. The 5% report is meant to watch changes in control, while this report is meant to watch insider trading.
Insider trading pre-disclosureInsider trading pre-disclosureA system in effect since July 24, 2024, under which executives and major shareholders who want to trade 1% or more of total issued shares, or KRW 5 billion or more, on a combined basis over the past 6 months must disclose the purpose, amount and period at least 30 days before trading begins.
Ownership disclosureOwnership disclosureFilings that tell you who holds how many shares and who has bought or sold them, such as large holdings of 5% or more and the share ownership of executives and major shareholders.
Related-party transactionsRelated-party transactionsSales, purchases and fund transactions with major shareholders, affiliates, associates and the like. If the share is excessively large or the terms differ from the market, profit or company money can be distorted.
Treasury stockTreasury stockThe company's own shares that it has bought and holds. It is recorded as a deduction from equity.
Convertible bond (CB)Convertible BondA corporate bond with the right to convert into the company's shares at a set price. The company can borrow at a low interest rate, but when it converts into shares, existing shareholders' stakes are diluted. Repeated issuance can be a sign of cash shortage.
DilutionDilutionWhen new shares are created, existing shareholders' ownership % and per-share figures (EPS, BPS, etc.) become smaller. Ownership after dilution = my shares ÷ (existing shares + new shares).
Material event reportMaterial event reportA report filed when something that greatly affects the company's management or assets happens, such as a paid-in capital increase, convertible bond issuance, treasury stock acquisition, a significant asset transfer, or a merger. It is filed by the day after the event occurs (within 3 days for mergers and the like).
KINDKorea Investor's Network for DisclosureThe listing disclosure system operated by Korea Exchange. Timely exchange disclosures such as supply contracts and preliminary earnings are posted there, and they can also be seen on DART under the exchange disclosure type.
Foreign ownership ratioForeign ownership ratioThe share of market capitalization held by foreign investors. At the end of 2025 it was about 30.8% across all Korean listed stocks. The higher the ratio, the more a stock is affected by foreign trading.
Put what you learned to use right away
Flows→This is educational material and not investment solicitation. There is no guarantee that past relationships will repeat in the future.