Korean companies cancelled ₩43.1tn of their own shares in five months — and bought only ₩20tn

Korean listed companies cancelled ₩43.1tn of their own shares between 1 January and 31 May 2026. Over the same five months they bought ₩20.0tn. That is the first time the burning has run at more than twice the buying, and it is not a change of corporate heart. It is a deadline.

The third amendment to the Commercial Act passed the National Assembly on 25 February 2026 and took effect on 6 March. It makes cancellation the default outcome of a buyback. A company that acquires its own shares must now cancel them within a year of acquisition. Blocks already sitting on balance sheets on 6 March get an extra six months — eighteen months in total, which expires in the first week of September 2027.

Almost everything else in the amendment exists to stop companies routing around that one sentence.

A treasury share is now legally nothing

Korean company law spent decades arguing over what a treasury share actually is: an asset the company owns, or a share that has effectively ceased to exist. The amendment picks the second answer and writes it into the statute. Treasury shares carry no voting rights, no preemptive rights and no claim on cash or stock dividends.

What follows from that reads like an inventory of the things people were doing with them.

A company can no longer issue bonds convertible into, or redeemable with, its own treasury shares. It cannot create a pledge over them. In a merger or a corporate split it cannot allocate the newly issued shares to its own treasury block. A trustee holding shares under a buyback trust may not dispose of them during the trust period and must return them to the company as soon as the trust ends. Selling quietly into the open market to whoever happens to be bidding is gone entirely: a permitted disposal now has to go to every shareholder in proportion to their holding, or to a named third party under one of the statutory exceptions.

The Financial Services Commission wrote the market-side half of this into the Capital Markets Act enforcement decree, approved by the State Council on 23 June and in force from 30 June. That decree deleted the exchangeable-bond provisions rather than restricting them, and the FSC was unusually direct about why: bonds exchangeable into treasury shares had been issued to parties friendly to the controlling shareholder in situations where the company had no real financing need, and worked in practice as a management-rights defence.

Buying used to outrun burning. It doesn’t now.

The five-and-a-half-year series the FSC published in June is the clearest single picture available of what Korean treasury shares were for.

Through 2024 every year added to the pile. Companies acquired ₩58.4tn of their own stock between 2021 and 2025 and cancelled ₩45.7tn of it, so about ₩12.7tn stayed put — and that is only the flow over five years, sitting on top of blocks accumulated across the decades before. 2025 was the first year cancellations edged in front, and only by ₩1.3tn.

Five months of 2026 reversed the whole period. Fold them in and the running totals invert: ₩78.4tn acquired since the start of 2021 against ₩88.8tn cancelled.

The run rate says it more bluntly. Cancellations averaged ₩1.78tn a month through 2025. Across January to May 2026 they averaged ₩8.62tn.

The largest single one came in August

SK hynix’s board met on 19 August 2026 and approved a ₩40tn buyback, every share of which is to be cancelled. At the previous day’s close of ₩1,662,000 that works out at roughly 24.07 million shares, about 3.3% of the 730,492,365 shares outstanding. Purchases began on 20 August and run for around three months. No Korean listed company has announced a larger cancellation.

The company presented it as pulling an existing commitment forward rather than making a new one. In November 2024 it had promised to return up to half of cumulative free cash flow over 2025–27; the August board resolution changed “within 50%” to “50% or more” and said dividends would continue alongside the cancellations. Net cash stood at about ₩69tn at the end of the second quarter.

Notice what this is not. SK hynix is not clearing an inherited block ahead of the September 2027 cut-off. It is buying fresh stock and destroying it inside the one-year window the new law allows for new acquisitions. The transitional deadline governs the stockpile; the one-year default governs everything bought from here.

What cancellation does not do

It does not return cash to shareholders. The cash leaves at the point of purchase. Cancelling afterwards shrinks the denominator, so earnings per share, book value per share and dividend per share all rise without a further won moving. For anyone modelling Korean equities that is a live variable rather than a footnote — it bears on how index providers and their weights read the market, and on what the National Pension Service’s enlarged domestic allocation is actually buying into, since the float is contracting while the buyer is scaling up.

Nor is the exception route narrow. A company may still hold and dispose of treasury shares for employee and executive compensation, or for stated business purposes such as introducing new technology or improving its financial structure, provided its articles of incorporation permit it. The catch is procedural: shareholders must approve a holding and disposal plan, signed or sealed by every director, and re-approve it each year. The June decree then extended the disclosure obligation for those plans from companies holding 1% or more of their shares in treasury to every listed company holding any at all, and required them to report execution against the plan rather than only the plan itself.

This is the third of three amendments in eighteen months, and it is the one with teeth. The first, in 2025, gave directors a fiduciary duty running to shareholders rather than only to the company. The second mandated cumulative voting for director elections and widened the separate election of audit committee members. Those changed who sits on boards and what they owe. This one changes the capital structure directly, on a clock, whether or not a board wants it to — and law firms advising on it have been careful to point out that the sanction for missing the deadline attaches to the directors personally.

For foreign investors who have spent years discounting Korean equities for exactly this — a share class that could be revived at the controlling family’s convenience — the interesting number is not ₩43.1tn. It is what the balance sheets look like in September 2027, once the vault is supposed to be empty and every remaining block has a name, a purpose and a shareholder vote behind it. The 2026 market itself has already priced some of this. The audit of who actually complied has not happened yet.

Figures current as of 31 August 2026. Acquisition and cancellation totals are Korea Exchange data by disclosure date, published by the Financial Services Commission on 23 June 2026; the 2026 column covers 1 January to 31 May 2026 only. Statutory dates are as promulgated. Nothing here is investment advice — see the disclaimer.