FilingsTodayInsider and 5% holder reports in Korea
Updated 2026-10-31
Korea has two separate ownership reports. Reading them correctly mostly means separating real trades from other changes in holdings.
Insider ownership report
Executives and shareholders with 10% or more file this report (임원ㆍ주요주주특정증권등소유상황보고서) after their holding changes. Each change is listed with a reason, a date, a number of shares and a price.
Only the reasons open-market buy (장내매수) and open-market sale (장내매도) are trades on the exchange. Gifts, inheritance, stock options, share lending and pledges also change holdings but are not market trades. This site shows trades as buys or sales and everything else as "Other change".
Large funds such as the National Pension Service file these reports when they hold 10% or more, and often buy and sell within the same report. Cards for such reports show both sides and the net.
Report of 5%+ holding
Under the "5% rule", anyone who holds 5% or more together with related parties reports it, and reports again when the stake moves by 1 percentage point or more. A stake can fall sharply without any sale when a related party leaves the group (특별관계 해소). Always read the reason.
This site labels new positions that cross 5% as "New 5%" and stakes that fall under 5% as "Below 5%".
How this compares with US filings
The Korean insider report plays the same role as the US Form 4, but the details differ. Form 4 must be filed within two business days and gives a transaction code for each line, where P is an open-market purchase and S an open-market sale. US executives often sell under pre-arranged 10b5-1 plans, which this site flags because they say little about the insider's current view. Korea's 5% report is closest to the US Schedule 13D and 13G filings.