The 28 companies reporting Q3 this week are 62.8% of KOSPI's market value. Two of them are 50.8%
KOSPI closed Monday at 5,469.47, its lowest since April, ahead of Korea's biggest earnings week. We weighed the 28 reporters by market value: Wednesday and Thursday carry 58.3% of the whole market. The other 26 companies add 12.0%.
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.
korea earnings weekkospi market value sharekospi weightssk hynix earningssamsung electronics earningskorea q3 earnings 2026
The KOSPI closed Monday, 26 October, at 5,469.47, down 1.46% and its lowest close since 6 April, according to Newspim. Foreign investors sold a net 753.1 billion won of KOSPI shares on the day. The market goes into the busiest week of the earnings season at that level.
How much of the market actually reports this week? We took the 28 companies on The Asia Business Daily’s earnings calendar and weighed each by its share of KOSPI’s total market value at Friday’s close, the same measure as our KOSPI market-value share page.
By day
| Day | Companies | Share of KOSPI market value |
|---|---|---|
| Mon 26 Oct | 3 | 0.52% |
| Tue 27 Oct | 7 | 2.00% |
| Wed 28 Oct (SK hynix) | 7 | 23.97% |
| Thu 29 Oct (Samsung Electronics) | 7 | 34.29% |
| Fri 30 Oct | 4 | 2.01% |
| Total | 28 | 62.80% |
KOSPI’s 940 listings were worth 4,582.2 trillion won on 23 October. The 28 reporters account for 2,877.6 trillion of it.
Two companies, half the market
Strip out SK hynix (20.36%) and Samsung Electronics (30.43%, of which 2.94 points are its preferred shares) and the remaining 26 companies are 12.01% of the market. That includes Kia, Hyundai Mobis, Samsung Electro-Mechanics, Hanwha Aerospace and seven financial groups.
The seven financial groups (IBK, BNK, JB, iM, Shinhan, Samsung Card and KB) are 2.78% together. Every Monday and Friday reporter combined is 2.53%.
So the week has two shapes. By number of companies, it is spread evenly from Tuesday to Thursday. By market value, 58.3% of the entire KOSPI reports on Wednesday and Thursday alone.
Why the number matters this week
A market-value share is not a forecast. It says how much of the index level is mechanically tied to a result. On Friday, KOSPI rose 0.30% while 719 of its listings fell and 173 rose in our data (the breadth count). A market this concentrated can move one way while most of its stocks move the other.
We weighed the two chip makers separately: SK hynix’s share of trading has run ahead of its share of value, and Samsung’s preferred shares fell less than the common in October.
This is a count of market value, not a view on any company. Statistics, not advice.
Related: Broker target prices for the same 28 companies · SK hynix is worth more than twice the whole KOSDAQ · Four stocks, half the market. More from the same data: Korean preferred shares: 36 of 111 trade above the common · When Korean companies must report quarterly results.
Data & Verification Notes
- Data as of
- Sources
- Korea Exchange (KRX OPEN API) — KOSPI daily stock trading for 23 October 2026, collected by SeoulMarkets: closing price and market capitalisation for all 940 KOSPI listings (829 common, 111 preferred). Total KOSPI market capitalisation 4,582.2 trillion won.
- The Asia Business Daily (view.asiae.co.kr), 25 October 2026 — Q3 earnings calendar for 26–30 October 2026: 3 companies on Monday, 7 each on Tuesday to Thursday, 4 on Friday.
- Newspim and Money Today, 26 October 2026 — KOSPI close of 5,469.47 (−80.83, −1.46%), lowest close since 6 April (5,450.33); foreign investors net sold 753.1 billion won on KOSPI (Newspim, including Nextrade); won closed at 1,323.1 per dollar.
- Cross-checks
- Share of KOSPI market value on 23 October, by reporting day (company level, common plus preferred): Mon 0.52%, Tue 2.00%, Wed 23.97%, Thu 34.29%, Fri 2.01%. Total 62.80% (2,877.6 trillion won).
- SK hynix 20.36% plus Samsung Electronics 30.43% (27.49% common, 2.94% preferred) = 50.79%. Common shares only, the two are 47.85%.
- The other 26 reporters together: 12.01%. The seven financial groups reporting this week: 2.78%.
- The 28 companies have 37 KOSPI listings: 28 common and 9 preferred (Samsung Electronics, Samsung SDI, Samsung Electro-Mechanics, Samsung C&T, LG Electronics, SK Innovation, Hyundai E&C, and two Doosan Fuel Cell lines).
- Excluded figures
- Free-float index weights. Index weights can be adjusted for free float; we do not have the float factors, so these are shares of total market value, not index weights.
- Monday 26 October stock-by-stock values. Our latest complete daily file is Friday 23 October; Monday's index figures are from wire reports.
- OCI: the calendar says 'OCI'. We used OCI (456040), the company in our broker-report list. Using OCI Holdings instead would raise the total by 0.07 percentage points.
- Earnings estimates. We weigh who reports, not what they will report.
- This is not investment advice.
- Instruments
- 000660, 005930, 005935, 105560, 055550, 000270, 012330, 009150
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.
Take this away — 5 cards
The figures in this article, as images. Free to repost with the address on them.
