SK hynix is 20% of KOSPI's market value but 25% of its October trading. It reports Q3 on Wednesday
SK hynix's share of KOSPI market value fell from 23.0% to 20.4% between 30 September and 23 October. Its share of trading did not: 77.4 trillion of 309.3 trillion won, more than Samsung Electronics on 10 of 15 days.
AI-assisted, human-reviewed sourcing. Figures are pulled programmatically from the official sources listed at the end of this article and checked by an editor before publication.
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SK hynix reports third-quarter results on Wednesday, 28 October. The FnGuide consensus, as reported by Financial News on 18 October, is 76.96 trillion won of operating profit on 98.23 trillion of revenue. Three months earlier the same consensus stood at 81.51 trillion. It came down 5.6%, and Financial News put that down to the won’s strength cutting the won value of dollar sales.
We looked at a different number: how much of the Korean market SK hynix now is, by value and by trading.
Value: down to a fifth
| Date | SK hynix close (won) | Share of KOSPI market value |
|---|---|---|
| 30 Sep | 1,776,000 | 23.01% |
| 20 Oct | 1,223,000 | 19.49% |
| 23 Oct | 1,277,000 | 20.36% |
SK hynix fell 28.1% from 30 September to 23 October. KOSPI’s total market value fell 18.7%. So its share of the market shrank by 2.65 points. On Monday it closed at 1,275,000 won, little changed.
Trading: still a quarter
Over the 15 KOSPI sessions from 1 to 23 October, 309.3 trillion won of shares changed hands on the Korea Exchange. 77.4 trillion of it, 25.0%, was SK hynix. Samsung Electronics, common and preferred together, was 74.0 trillion, or 23.9%. Samsung is the larger company by half again; SK hynix traded more.
| Share of KOSPI value (23 Oct) | Share of KOSPI trading (1–23 Oct) | |
|---|---|---|
| SK hynix | 20.36% | 25.0% |
| Samsung Electronics (common + preferred) | 30.43% | 23.9% |
SK hynix’s daily share of trading ran from 21.9% on 1 October to 29.6% on 21 October, the day KOSPI rebounded. It out-traded Samsung on 10 of the 15 sessions.
A stock that is a fifth of the market’s value and a quarter of its turnover is where the market’s argument is happening. Wednesday’s numbers land on that.
This counts value and trading, not what the results will be. Statistics, not advice.
Related: The 28 companies reporting this week are 62.8% of KOSPI · KOSPI market-value share by company · Samsung Electronics and SK hynix target prices in October. More from the same data: Samsung’s preferred-common gap, narrowest in our data · SK hynix is worth more than twice the whole KOSDAQ.
Data & Verification Notes
- Data as of
- Sources
- Korea Exchange (KRX OPEN API) — KOSPI daily stock trading, 30 September to 23 October 2026 (16 sessions in our archive), collected by SeoulMarkets: closing price, trading value and market capitalisation for every KOSPI listing.
- Financial News (fnnews.com), 18 October 2026, citing FnGuide — SK hynix Q3 2026 consensus as of 18 October: revenue 98.2257 trillion won, operating profit 76.9640 trillion won, down 5.6% from 81.5122 trillion three months earlier; results due 28 October.
- Newspim, 26 October 2026 — SK hynix closed at 1,275,000 won on 26 October (−0.16%).
- Cross-checks
- SK hynix share of KOSPI market value: 23.01% (30 Sep), 19.49% (20 Oct, October low), 20.36% (23 Oct). Price 1,776,000 → 1,277,000 won (−28.1%); total KOSPI market value 5,638.3 → 4,582.2 trillion won (−18.7%).
- October KOSPI trading value, 15 sessions 1–23 Oct: total 309.3 trillion won; SK hynix 77.4 trillion (25.0%); Samsung Electronics common plus preferred 74.0 trillion (23.9%).
- SK hynix's daily share of KOSPI trading value ranged from 21.9% (1 Oct) to 29.6% (21 Oct); it was above Samsung's (common plus preferred) on 10 of 15 sessions.
- On 23 October: 20.36% of market value, 27.9% of trading value.
- Excluded figures
- Nextrade (NXT) trading. Our trading values are Korea Exchange regular-market figures only.
- Free-float index weights. These are shares of total market value.
- Who did the trading. Our file has no investor-type split; wire reports say foreign selling concentrated on the two chip makers, which we have not measured.
- The consensus is FnGuide's as reported by Financial News; we did not collect it ourselves.
- This is not investment advice.
- Instruments
- 000660, 005930, 005935
The full dataset behind these figures — every listed company, every row — is available to license. SeoulMarkets data for licence →
Not investment advice. SMarkets publishes data journalism for general information only. Nothing here is investment advice, a recommendation, or an offer to buy or sell any security — any investment you make is at your own risk and responsibility. Figures are derived from official public data sources and may be revised by the issuing agency. Verify independently before acting.
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