What it is
Net buying means purchases exceed sales. Foreign net buying means foreign investors as a group bought more than they sold that day; the opposite is net selling.
Why it matters
Foreign investors trade a large share of Korean large caps, so daily flows by foreigners, institutions and individuals are closely watched.
What to keep in mind
Flows mix long-term money with short-term trades tied to the won and index futures. Multi-day trends say more than a single day.
This explanation is general information, not investment advice. Rules reflect September 2026 and may change; check official exchange and broker notices.