SK hynix to cancel 40 trillion won of shares — Korea's largest, and the stock fell 9.75%

Two numbers from the same day tell the story.

40.0043 trillion won — the value of its own shares that SK hynix resolved on August 19 to buy and destroy. It is the largest such resolution by any Korean listed company.

-9.75% — what the stock did that day.

1. What the board approved

The last row is the one that matters.

If a company only buys its own shares, they sit in treasury. They can be resold, used as consideration in an acquisition, or granted to employees. For as long as that is possible, shareholders face an overhang that can return to the market.

Cancellation extinguishes them legally. Shares outstanding fall from 730.49m to 706.42m and cannot come back. This page sets out the mechanics separately in "What a share cancellation is — why destroying stock makes your slice bigger."

2. Where the money came from

SK hynix reported net cash of about 69 trillion won at the end of the second quarter of 2026.

Net cash means cash after subtracting all borrowings. The company could repay every debt and still hold 69 trillion won — and it is returning 40 trillion of that to shareholders.

The cash came from AI memory. High-bandwidth memory demand has reshaped the company's earnings, and management said it is pulling forward a shareholder-return plan originally scheduled for 2025-2027. Alongside the cancellation it set a standard: more than 50% of free cash flow returned to shareholders through 2027.

There is a tension worth naming. The same company said earlier in August that it would raise capital expenditure to the high-40-trillion-won range, a roughly 60% increase. Capex and shareholder returns compete for the same cash. A 69 trillion won net cash position is what makes both possible on paper — but the company did not explain how the cancellation affects the investment plan.

3. So why did it fall 9.75%?

SK hynix closed at 1,500,000 won, down 9.75%. Samsung Electronics fell 7.82%. The largest shareholder return in the market's history did not hold the price up.

The reason was elsewhere.

When long rates rise, the companies punished hardest are those whose earnings sit furthest in the future. A memory maker priced on an AI boom is the archetype. The 3.3% reduction in share count mattered less, on this day, than the compression of the multiple applied to those shares.

This is not an argument that cancellations are pointless. A cancellation works permanently on the denominator — the share count. A rate shock works on that day's multiple. They operate on different layers over different horizons. What August 19 demonstrated clearly is that you cannot measure a cancellation's effect by the share price on announcement day.

One clue remains open. Reports noted SK hynix jumping in after-hours trading once the regular session closed, which hints the disclosure may have landed near the end of the day. But this page could not confirm the exact time of the board resolution or the disclosure, so it cannot say how much of the 9.75% fall preceded the news.

4. What is left and what could not be confirmed

• Disclosure timing — not confirmed. After-hours strength suggests a late-session release, but this is not established.
• Pace of execution — the filing does not say how the 40 trillion won will be spread across the three-month window. For that period the market gains one additional large buyer every day, and the distribution of that buying is not public.
• Price per share — 40,004.3bn won ÷ 24.07m shares is about 1.66m won, but that is a planned figure; actual prices depend on the market.
• Relationship to capex — how a high-40-trillion-won investment plan and a 40 trillion won cancellation are funded together was not explained.

The whole market's move that day is covered in "KOSPI closes at 6,471.17 on August 19, 2026," and the mechanics of cancellation itself in "What a share cancellation is."