Korean business segment reporting, by company size: the biggest disclose eight, the smallest disclose one
Half of 737 Korean listed companies report a single business segment. Among companies above $10bn in market value only 23% do — and their median is eight. Segment disclosure is not in the accounts tape; it is in the annual report text.
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.
segment reportingifrs 8dartkoreaannual reportdisclosure
Of 737 Korean listed companies whose 2025 annual reports we could read, 365 — almost exactly half — describe themselves as having a single business segment. That share is not the same across the market. It falls steadily as companies get larger, and among the largest it is less than a quarter.
Half the market reports one segment. The biggest quarter of it does not.
| Size band | Companies | Report a single segment | Median segments |
|---|---|---|---|
| Mega ($10bn+) | 53 | 23% | 8 |
| Large ($1–10bn) | 193 | 48% | 2 |
| Mid ($300m–1bn) | 259 | 53% | 1 |
| Small (under $300m) | 232 | 53% | 1 |
| All counted | 737 | 50% | 1 |
The gradient is the finding. A $10bn Korean company typically breaks itself into eight parts in its annual report; a $300m one typically does not break itself up at all. Between the Mid and Small bands the share is flat at 53% — the difference is concentrated at the top, not spread evenly through the market.
Where this data actually lives
Segment information is not in the standardised accounts feed. We checked: DART’s
fnlttSinglAcntAll endpoint returns 229 account lines per company, and none of them is a
segment. Everything here comes from the annual report source document — the document.xml
inside each filing, which arrives as a 676KB archive and expands to roughly 6.3MB of text.
That matters for anyone trying to build this themselves. The accounts API is the obvious place to look and it is the wrong place. The information exists only in prose, so it has to be read out of prose.
The companies that split themselves the most
| Company | Ticker | Segment expressions |
|---|---|---|
| Shinhan Financial Group | 055550 | 40+ |
| Hanwha | 000880 | 40+ |
| Kolon | 002020 | 40+ |
| Daishin Securities | 003540 | 39 |
| KB Financial Group | 105560 | 38 |
Read the “40+” literally: it is our ceiling, not theirs. We stop counting at forty, and three companies reached it. We would rather show you where our ruler ends than print a number that looks precise and is not.
What we are not claiming
A count of segment expressions in an annual report is not a count of IFRS 8 reportable segments. Korean financial holding companies in particular name subsidiaries, divisions and product lines in the same passage, which is why the top of that last table is financial groups. A company appearing with 38 segment expressions has not told regulators it runs 38 reportable segments; it has used the word that many times in ways our reader accepted.
We also could not read every company. Twenty-nine annual-report documents did not come back, and in eighteen more the report stated that segments exist but we could not extract a name. Those 47 are excluded from all figures above rather than counted as zero — a company we failed to read is not a company with no segments.
Method
We fetch the annual report source document for each listed company from DART, read segment wording out of the report text, and count distinct segment names per company, capped at 40. We exclude companies whose report explicitly says it reports as a single segment from the name-extraction step and record them directly as one. Market capitalisation from KRX is used only to assign a size band, never to compute a segment count. The full table, including every company and its count, is published free at Korean companies’ business segments.
Company-by-company segment data for Korea, Japan and the Gulf is part of the SeoulMarkets filings tape — see Data for licence for what is covered and Pricing for terms. Not investment advice.
Data & Verification Notes
- Data as of
- Sources
- DART (Financial Supervisory Service electronic disclosure) — Annual report source documents (document.xml), 2025 filings — segment wording is read from the report text, not from the standardised accounts API
- Korea Exchange (KRX) — Daily quotations — market capitalisation used only to place each company in a size band
- SeoulMarkets — collect-dart-segments.mjs (784 companies fetched) and build-segments-data.mjs (737 counted)
- Cross-checks
- 737 companies counted out of 784 fetched. The 47 difference is reported, not dropped silently: 29 annual-report source documents could not be retrieved, and in 18 more the report said segments exist but no segment name could be extracted.
- Size bands use KRX market capitalisation on the same date for every company; no company is missing a market value in the counted set.
- Band medians: Mega 8 segments, Large 2, Mid 1, Small 1. Share reporting a single segment: Mega 23%, Large 48%, Mid 53%, Small 53%.
- Excluded figures
- We do not publish a segment count above 40. Forty is our own ceiling, and five companies hit it — Shinhan Financial Group, Hanwha and Kolon are shown as 40+ because our reader stopped, not because the company reports exactly forty.
- A count of segment expressions in an annual report is not the same as the number of IFRS 8 reportable segments. Some companies name product lines, divisions and subsidiaries in the same passage. We count what the report says, and we say that is what we count.
- We have not compared this against Japan, the United States or any other market. We have no equivalent count for them yet, so we make no claim that Korean single-segment reporting is high or low.
- Instruments
- 055550, 105560, 000880, 003540, 002020
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.
← More Equities