It is the break-even line for an asset accumulated in several purchases: above it the position shows a paper gain, below it a paper loss. A company selling below its own cost basis is usually raising cash rather than taking profit, which makes it a useful clue to why the sale happened.
Awaiting gradingWhy did the Kospi fall another 8% on the day JPMorgan said the forced selling was nearly done?KOSPI jumped a record 17.91% on 7/31, but foreign and institutional selling resumed on 8/3, sending Samsung/SK hynix down another 7-8% and KOSPI down ~3.6%. The reversal within days makes it too early to tell whether this is the tail of the liquidation or fresh selling. Score after another 1-2 weeks once the swings settle.