Investing & Market Terms 14 Nov. 2, 2026 · Market Basics

When a Subsidiary Goes Public, Do Parent Shareholders Lose Out?

SK hynix has shelved plans for a U.S. listing of its indirect subsidiary Solidigm,
79 days after reports of the proposed IPO first emerged.
The company said it would reassess whether the move
was truly in the best interests of existing shareholders.

Double-listing rules8.3Restrictions take effect

Solidigm IPO reports8.5U.S. listing plans emerge

IPO review halted10.2379 days later

01IPO halted after 79 days 02Ownership is not the same as value 03How to read a subsidiary IPO story

About 5 min · 1 quiz · 1 interactive exercise

Short on time?Three key takeaways

Parent-subsidiary double listingWhen both a parent company and a subsidiary or indirectly controlled company are separately listed on a stock exchange.means a parent and its subsidiary are both publicly traded. The same business can carry two stock-market price tags.
If the subsidiary issues shares, or the parent sells part of its stake, the parent's ownership percentageThe percentage of a company's shares held by a shareholder. Owning 800,000 out of 1 million shares means an 80% stake.falls. But a smaller percentage does not automatically mean a loss in value.
Since August, a parent company's board must assess the shareholder impact and propose safeguards before listing a subsidiary. A split into a wholly owned subsidiaryA corporate split in which the parent transfers a business into a new company and retains 100% of its shares. Existing shareholders continue to own shares in the parent, not the new company. requires shareholder approval.

Tap or hover over an underlined term to see its definition.

01THE EVENT & THE QUESTION

An IPO Shelved
After 79 Days

We begin with a question. This one uses hypothetical figures.

WARM-UP QUIZHypothetical example

Parent AA company that controls another by owning enough of its shares. The controlled company is its subsidiary. owns all shares of subsidiaryA company controlled by another company's shareholding. A subsidiary's own subsidiary is an indirect, or second-tier, subsidiary. B. B issues new shares and goes publicThe process of listing a company's shares on a stock exchange so investors can trade them.. What happens to the value of A's stake in B?

B shares owned by A1m shares (100%)
Value per B shareKRW 100,000
New B shares offered250,000 shares at KRW 100,000 each

Aug.–Oct. 2026 · Actual eventsFrom IPO Reports to a Halt

8.3
New rules generally prohibiting double listings take effect, subject to exceptions
8.5
Reports say SK hynix is preparing a U.S. IPO of its indirect subsidiaryA company controlled by a subsidiary. In this case, SK hynix controls AI Company, which in turn owns Solidigm. Solidigm
10.7
Bloomberg reports that the banks to manage the IPO (underwritersInvestment banks that manage an IPO, help set the offer price and sell shares to investors.) have been selected. SK hynix says "nothing has been finalized."
October
During a parliamentary audit, the head of Korea's Financial Supervisory Service says the planned listing would fall under the double-listing rules
10.23
SK hynix says it is halting both pre-listing fundraising (pre-IPO investmentAn equity investment by institutions or other investors before a company goes public.) and its IPO review in a regulatory filingA disclosure of information material to investment decisions, such as a filing with Korea's DART system.

SK hynix fell 10.37% on Aug. 6 but rose 4.42% on Oct. 23. Other factors moved markets on both days (the KOSPI fell 4.58% on Aug. 6), so the portion attributable solely to Solidigm news cannot be isolated.

One Story, Two Interpretations

View ABad for parent shareholdersThe critics' concern

NAND flashNonvolatile memory that retains data without power, used in SSDs and smartphone storage. When NAND was in a downturn, SK hynix shareholders bore the losses. If the business improves, they must share the gains with outside investors.
Having two market prices attached to the same business could lead investors to value the parent less generously.

View BNot necessarily a lossThe case in favor

Listing could help recover acquisition costs and fund U.S. expansion without using the parent's cash. Some brokerage analysts also see limited impact on the parent's valuation.
Some brokerage analysts see limited impact on the parent's valuation.

The two views turn on one question: Does a parent's economic interest become less valuable after the IPO?

The parent's stock already reflects its stake in the subsidiary. Once the subsidiary is listed, that stake gets a separate market price too. This is what Korean investors call a parent-subsidiary double listingBoth a parent and a subsidiary (or indirect subsidiary) are listed. In Korea, listing a business previously transferred into a wholly owned subsidiary is also criticized as a 'piecemeal' or 'split-off' listing..

Does a subsidiary IPO
hurt the parent's shareholders?

Not necessarily. A smaller ownership percentage is not the same as a smaller economic stake.

THE ANSWER IN ONE SENTENCE

A new share issue or sale of existing shares can reduce the parent's percentage ownership. That alone does not prove its shareholders have lost value.

The outcome depends on the price paid for the subsidiary shares, where the proceeds go, and how the subsidiary's value ultimately benefits the parent's shareholders.

02MECHANICS & KEY TERMS

Ownership Percentage
Is Not Economic Value

First, understand how companies split businesses. Then follow the cash raised in an IPO.

Parent, Subsidiary and Indirect Subsidiary

Subsidiary : A company controlled through another company's ownership. A subsidiary controlled one level further down is an indirect subsidiary.
Solidigm : A wholly owned indirect subsidiary in the chain SK hynix → AI Company → Solidigm.The business was established in 2021 after the acquisition of Intel's NAND and SSD operations.

Two Ways to Separate a Business

Split into a wholly owned subsidiaryThe parent places a business into a newly formed subsidiary and owns all its shares. Existing shareholders retain their original parent-company shares only. : The parent holds 100% of the new company's shares. Existing shareholders continue to hold only parent shares.
Pro rata spin-offExisting shareholders receive shares in the new company in proportion to their holdings in the original company, giving them direct stakes in both. : Existing investors receive new-company shares in proportion to their existing holdings.
If a parent later lists a subsidiary created through the first method, Korean headlines may call it a "piecemeal IPOA critical Korean label for taking public a subsidiary carved out from an existing company while the original shareholders still own shares only in the parent.."

ON THE BOARD · LG Chem's Battery Business

The shareholders stayed put.
The business moved one level down.

WHENWHAT HAPPENED 2020.10.30Extraordinary general meetingA shareholder meeting held outside the regular annual meeting to vote on major transactions such as splits and mergers. approved · 82.3% of shares represented voted yes 2020.12.1LG Energy Solution established · LG Chem owns 100% 2022.1.27LG Energy Solution lists · 42.5m shares offered After listingLG Chem retains 81.84%

LG Chem shareholders still owned LG Chem shares, not shares in both companies.
The battery business now sat inside its subsidiary.

Where Does the IPO Money Go?

Selling shares to outside investors as part of a listing is called a public offeringA sale of shares to investors in connection with an IPO. It can include newly issued shares or shares sold by existing shareholders.. Whether investors buy newly issued shares (primary sharesNew shares issued by a company. The proceeds go to the issuing company.) or already outstanding shares (secondary sharesShares already owned by an investor. Sale proceeds go to that selling shareholder.) determines who receives the money.

Primary offering : The subsidiary issues new shares; the proceeds go to the subsidiary.
Secondary offering : The parent sells shares it already holds, and the proceeds go to the parent. Here, "secondary" means shares sold by an existing holder.
Both methods reduce the parent's ownership percentage. LG Chem's stake fell from 100% to 81.84%.

If the subsidiary issues no new shares and the parent sells none, its percentage ownership does not change. This could be a listing alone, or a sale between other shareholders.

Take Subsidiary B PublicHypothetical example

Parent A owns all 1 million shares of Subsidiary B. For this exercise, B is worth KRW 100bn, or KRW 100,000 per share. An offering of 250,000 B shares is planned. Choose the type of shares and the offer price to see what changes.

Which shares are sold?

Offer price (assumed value: KRW 100,000 per B share)

A's stake in B—

Cash received by A—

Total value to A—

Choose the shares and offer price to explore the outcome.

This is a hypothetical model. B's assumed KRW 100bn operating value remains unchanged after listing. No one knows a real company's intrinsic value with precision. Taxes and listing costs are excluded, and actual stock prices do not follow these calculations mechanically.

Why is the loss KRW 4bn for a new-share issue at KRW 80,000, but KRW 5bn for an existing-share sale at the same price? In the primary offering, shares outstanding rise to 1.25m and new investors own 20%. In the secondary offering, they acquire 250,000 of the original 1m shares, or 25%.

Easy to confuseLower ownership ≠ lower value

When new shares are issued at fair value, ownership falls but the value of the stake remains unchanged.
The value is transferred away when shares are sold below fair value.That discount benefits the new shareholders.

Why Investors Still Worry

Holding-company discountWhen a parent company trades at a market value below the estimated value of its stakes in subsidiaries, often described as a holding-company discount. : When investors can buy the subsidiary directly, they may assign a lower valuation to the parent's indirect stake.
Outside investors : The subsidiary's profits belonged to the subsidiary even before listing. The difference is that outside shareholders will now share in those profits.
Revaluation : Conversely, a listed subsidiary can make its business value more visible and support a reassessment of the parent.

The simulator's "value to A" is a theoretical calculation. The parent's actual share price can still fall because of holding-company discounts even when the modeled value is unchanged.

Rules That Changed in August

Since Aug. 3, Korea Exchange has reviewed domestic subsidiary IPOs on the basis of general prohibition, with exceptions. A U.S. listing does not undergo a Korea Exchange listing review, but the parent's board still has obligations to protect shareholders.

The Requirements Depend on the SubsidiaryEffective Aug. 3, 2026

Subsidiary formed by a parent-retained split: Approval by the parent company's shareholders is mandatory.
Other subsidiaries: Shareholder approval satisfies the relevant condition; without it, Korea Exchange conducts a separate, stricter review.
Small subsidiaries: Shareholder approval is waived if the subsidiary's revenue, operating profit and assets are each below 10% of the parent's. But the exemption does not cover a material subsidiaryA subsidiary whose prospective equity valuation is substantial despite its small share of revenue, and which therefore cannot claim the small-subsidiary exemption.or one created through a parent-retained split.
Overseas listing: No Korea Exchange listing review is required, but the parent board's duties still apply.

Five Duties of the Parent's Board

1Assess
impact

2Plan
safeguards

3Engage &
vote

4Board
approval

5Disclose
each step

Examples of safeguards include distributing subsidiary shares through an in-kind dividendA dividend paid in property rather than cash. Distributing subsidiary shares gives parent shareholders direct ownership in the subsidiary.or cancelling treasury sharesRetiring shares repurchased by the company reduces the share count and increases each remaining share's proportional interest (see Part 12).. Violations can result in penalties of up to KRW 1bn and a trading suspension lasting up to one day. trading suspensionA temporary halt in trading of a listed security imposed by the exchange.

How Shareholder Approval Is Counted3% voting capVotes on shares held above a 3% ownership threshold are capped at 3%. This prevents a handful of large shareholders from deciding the outcome alone.

VOTE COUNT

A shareholder with more than 3% ownership can vote only up to 3%. The controlling shareholder's family and affiliates are aggregated for the 3% cap.

PASSING THRESHOLD

A majority of the shares represented at the meeting must vote yes, and yes votes must equal at least issued sharesAll shares issued by a company, including those not represented at a shareholder meeting.25% of all outstanding voting shares.

Companies already double-listed are not subject to the new rules. Regulators have said they will update the guidelines periodically.

MORE CONTEXTRelated Double-Listing Terms

Scope of the rules : They cover a subsidiary included in the parent's consolidated financial statementsA company controlled by the parent whose financial results are incorporated into the parent's consolidated accounts., or an affiliate in a vertically controlled group under Korea's Fair Trade Act. This includes affiliates in which the parent owns at least 20%, and second-tier companies in which those affiliates hold more than 50%. Relationships that existed within the previous year are also covered.

Independent special committee : The board's process must include an independent special committee review. The final guidelines strengthened this by requiring an independent director to chair the committee, with independent directors and outside members making up at least two-thirds of its membership.

In-kind dividend : A distribution of assets, such as shares, instead of cash. Giving subsidiary shares directly to the parent's shareholders is listed as a possible shareholder safeguard.

Appraisal rights : Since December 2022, shareholders who oppose a listed company's parent-retained business split may demand that the company buy their shares. The price is negotiated first; failing agreement, a reference price based on market prices before the board resolution applies.

Overseas IPOs and securities registration : Even if shares are sold overseas, a securities registration statementA regulatory filing submitted before securities are offered to investors, containing information about the company and offering terms.may be required if they could be resold to domestic investors within a year. The Financial Supervisory Service reviews such filings. Regulators had not yet clarified whether Solidigm's proposed IPO met that condition.

Pre-IPO investment : Equity funding raised before a stock-market listing. Solidigm considered it alongside an IPO, then suspended both reviews.

THE ANSWER FROM PART 2

A lower ownership percentage does not destroy value if the shares are sold at fair value. Selling below value transfers wealth away from the existing owner.

Since August, a parent considering a subsidiary IPO must assess the effect and propose shareholder protections.

03PUT IT INTO PRACTICE

How to Read a
Subsidiary IPO Story

Apply what we have learned to Solidigm first.

Which Rules Applied to Solidigm?

Subsidiary created by a parent-retained split?No

Solidigm was acquired from Intel, so it was not automatically subject to mandatory parent-shareholder approval under that category.

Covered by double-listing rules?Yes

It is indirectly controlled by SK hynix. A U.S. listing would avoid Korea Exchange review, but SK hynix's board duties would still apply.

Eligible as a small subsidiary?Undetermined

The review ended before that could be established. SK hynix said the regulation was not the direct reason for its decision.

Read any headline saying "Company X plans a subsidiary IPO" in the same order. Look for four pieces of information in the filing and reporting.

Four Questions to Ask About a Subsidiary IPO

01How was the subsidiary created?

Was the business carved out or acquired? For a parent-retained split, shareholder approval is mandatory.

02Are new or existing shares being sold?

A primary issue funds the subsidiary; a secondary sale funds the parent. First identify who receives the cash.

03What is the offer price?

Price matters more than percentage ownership alone. Because no one knows exact fair value, examine the discount against comparable companies(IPO discountThe percentage by which an IPO offer price is set below a valuation benchmark based on comparable companies, often used to attract investors.).

04How are parent shareholders protected?

Check the filing for in-kind distributions, share cancellations and a shareholder vote. If no vote is held, the company must disclose why.

COMMON MISREADINGSPlausible, but wrong

MYTH 01

"A subsidiary IPO always sends the parent's stock lower."

The outcome depends on the structure, offer price and market valuation. On Aug. 6, when SK hynix fell more than 10%, other memory stocks also sold off. A single day's return cannot identify one cause.

MYTH 02

"The parent's stake got smaller, so its shareholders lost money."

At fair value, a primary offering increases the subsidiary's value by the amount of new cash. The parent may own 80% rather than 100% and still hold an equally valuable stake. Losses arise when shares are sold below value.

MYTH 03

"If the IPO is overseas, Korean rules no longer matter."

A foreign IPO is not reviewed by Korea Exchange, but the parent's board still has shareholder-protection duties under the August rules. The control relationship matters, not simply the exchange used.

PART 14 · IN ONE SENTENCE

A parent-subsidiary double listing puts two price tags on a business with overlapping ownership.

You cannot determine whether parent shareholders benefit or lose simply by looking at the ownership percentage. Ask whose shares were sold, at what price, where the proceeds ended up, and what the parent shareholders gained or gave up.

Know someone asking, "My company's subsidiary is going public.
Should I sell the parent stock?"

Post to X

UP NEXT

SK hynix reported KRW 83.3338tn in operating profit for Q3, but only KRW 39.7756tn in net income. More than half the operating profit did not carry through to the bottom line. What happened in between?

Part 15Why Did KRW 83tn in Operating Profit Become Just KRW 40tn in Net Income? (working title)

QUICK GLOSSARY

Parent-subsidiary double listing: Both a parent and a company it controls are separately listed on stock exchanges
Piecemeal IPO: Listing a subsidiary created through a business split that left the parent holding its shares
Subsidiary / indirect subsidiary: A company controlled by another; a subsidiary owned through an intermediate subsidiary is an indirect subsidiary
Parent-retained business split: A corporate split into a new company in which the parent retains 100% ownership
Pro rata spin-off: A corporate split in which the original shareholders receive shares in the new company proportionate to their holdings
Primary offering: Sale of newly issued shares; the issuing company receives the cash
Secondary offering: Sale of existing shares; the selling shareholder receives the cash. Here 'secondary' refers to shares already outstanding
Public offering: Sale of shares to outside investors as part of a stock-market listing
IPO offer price: The price at which shares are sold to investors in an IPO
IPO underwriters: Investment banks that organize the offering, set terms with the issuer and distribute shares to investors
Pre-IPO investment: Equity funding raised before the company goes public
Holding-company discount: When the parent's market value is lower than the estimated value of its interests in subsidiaries
In-kind dividend: A dividend paid in property such as shares rather than cash
Appraisal rights: A dissenting shareholder's right to demand that the company repurchase their shares in certain major corporate transactions
3% voting cap: A rule counting no more than 3% voting rights for a shareholder who holds over 3%
Small subsidiary: A subsidiary whose revenue, operating profit and assets each fall below 10% of the parent's corresponding figures

ACTUAL CASE FILES

Sept. 2020–Jan. 2022 · LG Chem and LG Energy Solution

On Sept. 17, 2020, LG Chem's board resolved to separate its battery business into a wholly owned subsidiary. Its shares fell 11.2%, from KRW 726,000 to KRW 645,000, over Sept. 16–17 around the decision. On Oct. 30, an extraordinary general meeting approved the split with 82.3% of represented shares and 63.7% of all voting shares in favor. Korea's National Pension Service opposed it. LG Energy Solution listed on Jan. 27, 2022, at KRW 300,000 per share, raising KRW 12.75tn.

Aug. 6, 2026 · Memory stocks sell off together

SK hynix closed down 10.37% at KRW 1,495,000. The KOSPI closed at 6,296.38 (−4.58%) and Samsung Electronics fell 6.30%. Reports cited weaker-than-expected forecasts from U.S. storage firms SanDisk and Western Digital alongside the Solidigm IPO reports.

Oct. 7, 2026 · Reported choice of Solidigm IPO underwriters

Bloomberg reported that Goldman Sachs and Morgan Stanley had been selected as underwriters and a New York listing could come as early as 2027. SK hynix said it was considering various options but nothing had been finalized.

Oct. 23, 2026 · IPO review suspended

SK hynix cited financial-market volatility and a correction in semiconductor shares. The company said regulation was not the direct cause. Because financing for expansion of Solidigm's U.S. manufacturing was still needed, SK hynix would revisit the timing, scale and funding methods. That day, SK hynix closed at KRW 1,277,000 (+4.42%), while the KOSPI finished at 5,550.30 (+0.30%).

Oct. 28, 2026 · SK hynix approves additional repurchases

Alongside Q3 results, the board approved approximately KRW 10tn in repurchases for shareholder returns, with all those shares to be cancelled. It also planned a separate KRW 10tn repurchase for employee compensation (seePart 12 on buybacks).

Oct. 28, 2026 · Naver Financial also within scope

A planned share swap with Dunamu would reduce Naver's stake in Naver Financial from 69% to around 17%. Reports said voting agreements would let Naver retain control and consolidate Naver Financial, so any eventual IPO would still be subject to the double-listing rules. The planned exchange date was March 31, 2027.

HOW TO READ THESE NUMBERS

Daily share prices and IPO headlines : SK hynix's −10.37% on Aug. 6 and +4.42% on Oct. 23 are recorded daily closing moves. Both sessions had other catalysts, and the portion caused specifically by Solidigm cannot be separated.

79 days : Measured as the calendar-day difference between Aug. 5, when the IPO plans were reported, and Oct. 23. Some articles cited 78 days.

Solidigm's valuation : Reported estimates ranged from up to USD 100bn to up to USD 150bn, so this article does not select one. Estimated IPO proceeds also differed, at USD 10bn–15bn. The review ended before any primary-versus-secondary offering mix was decided.

Details of the regulation : The July 6 proposal and July 31 final version differed, including stronger special-committee requirements and a recommendation for electronic voting. The aggregation of controlling shareholders and related parties under the 3% cap follows reporting on the final guidelines. The small-subsidiary 10% threshold and scope follow materials explaining the July proposal; the maximum KRW 1bn penalty and one-day trading halt are based on October coverage summarizing the guidelines.

LG Chem case : The two-day share-price decline around the split decision is not attributed solely to the split. The vote passed with 82.3% of represented shares and 63.7% of all voting shares in favor.

Take Subsidiary B Public : These are hypothetical figures. The exercise assumes B has a known value and its operating value does not change after listing. In reality, the use of IPO proceeds and the market's assessment of both businesses affect outcomes.

Leave unverified figures blank.

SOURCES & DATA NOTES

General prohibition with exceptions; parent-board duties; 3% voting-cap recommendation; mandatory shareholder approval for parent-retained splits; overseas listing rules; securities registration for overseas offers that could return to Korea within one year; exclusion of already-listed firms; regular updates · Newsis 2026.07.06
Scope of regulation (consolidated subsidiaries and vertical control, 20% and 50% ownership, prior-year relationships); 10% small-subsidiary threshold; five board duties (examples of in-kind dividends and cancellations, disclosure of why a vote was not held); independent committee; penalties · Samil PwC, "Double-Listing Guidelines" · Bae, Kim & Lee newsletter 2026.07.06
Aug. 3 effective date; 3% cap (aggregation of the controlling shareholder's related parties); majority of represented votes plus one-quarter of issued shares; compulsory approval only for parent-retained split subsidiaries; enhanced special-committee requirements; electronic-voting recommendation; overseas listing coverage · Herald Economy · SBS Biz 2026.07.31
Solidigm IPO reports; SK hynix Aug. 6 close KRW 1,495,000 (−10.37%); small-versus-material subsidiary analysis; acquisition of Intel NAND business · Sisa Journal-e 2026.08.06
Aug. 6: KOSPI 6,296.38 (−4.58%), Samsung Electronics −6.30%; earnings outlooks for SanDisk and Western Digital · MTN 2026.08.06
Indirect-subsidiary chain (AI Company); critics' concerns (sharing prior losses, dividend path); arguments in favor (recovering acquisition costs, funding U.S. investment, limited value impact) · Weekly Kyunghyang 2026.10.05
Bloomberg report on Solidigm IPO underwriters; SK hynix statement that no decision was final · MTN 2026.10.08
Financial Supervisory Service governor's parliamentary testimony; pending regulatory interpretation of securities registration; reported IPO size and valuation estimates · Newstomato 2026.10.20
Oct. 23 disclosure halting pre-IPO funding and IPO review; reference to the best interests of existing shareholders; 100% indirect ownership through AI Company · NewsPim 2026.10.23
IPO preparations first reported Aug. 5; 79-day period; company says regulation was not the direct reason · Yonhap News (republished by KoreanCenter) 2026.10.23 · 78-day count; reassessment of funding for U.S. manufacturing expansion · Kyungbuk Maeil 2026.10.23
SK hynix Oct. 23 close KRW 1,277,000 (+4.42%) · EToday 2026.10.23 · KOSPI Oct. 23 close 5,550.30 (+0.30%) · Asia Economy 2026.10.23
LG Energy Solution offering split: 34m new shares and 8.5m existing shares; maximum proceeds KRW 10.2tn and KRW 2.55tn respectively · LG press release 2021.12.08 · Offer price KRW 300,000; total proceeds KRW 12.75tn · LG press release 2022.01.14
Listing scheduled for Jan. 27 · NewDaily 2021.12.13 · LG Chem ownership 81.84% · Economist Korea 2022.01.20
Sept. 17 split resolution and Dec. 1 company launch · Newsis 2020.09.17 · 11.2% share-price decline over two days · Seoul Shinmun 2020.09.18 · Approval by 63.7% of all voting shares; National Pension Service opposed · Newstomato 2020.10.30 · 77.5% attendance; 82.3% approval among represented shares · Dailian 2020.10.30
Appraisal rights for shareholders opposing parent-retained splits · Business Watch 2022.12.20
Naver Financial ownership changes, retained consolidation and applicability of double-listing rules; penalties up to KRW 1bn and a one-day trading halt · Business Watch 2026.10.28
SK hynix Oct. 28 shareholder returns (approximately KRW 10tn buybacks for cancellation, separate KRW 10tn employee-compensation plan) · SBS Biz · Business Watch 2026.10.28
Next-part preview: SK hynix Q3 operating profit KRW 83.3338tn and net income KRW 39.7756tn · Kyungbuk Maeil 2026.10.28
The "Take Subsidiary B Public" simulator and warm-up quiz use hypothetical figures solely to illustrate concepts.
Handwriting font · Gaegu (The Gaegu Project Authors, SIL Open Font License 1.1), subset to the characters used here.

This article is educational material explaining financial-market terminology and how to interpret it. It is not a recommendation to buy or sell any security. Investors are responsible for their own decisions and outcomes.