Korean Retail Investors Retreat en Masse as Corporate Buybacks Prop Up KOSPI Alone
nashnova research
KOSPI faces a rare triple sell-off — retail, foreign, and institutional investors are all net sellers simultaneously. The only bid left comes from Samsung Electronics and SK Hynix buybacks, and Goldman Sachs estimates that firepower runs out around mid-October.
Where did the retail money go?
Retail net buying collapsed 90% month-on-month in August, dropping from ₩5.45 trillion in June to just ₩540 billion.
The behavioral shift is stark: retail traders who once bought every dip are now selling into small rallies to cut losses. This means → they have flipped from offense to retreat.
Brokerage margin balances fell below ₩100 trillion, while term deposits at Korea's five major banks topped ₩1,000 trillion for the first time. In plain terms = retail investors aren't broke — they're moving cash from equities into bank savings.
Why hasn't KOSPI collapsed?
In August, both foreign and domestic institutional investors were net sellers. The only net buying came from "other corporates" — essentially corporate buybacks.
The buyers are Samsung Electronics and SK Hynix. On one September trading day alone, the two repurchased a combined $1.2 billion, accounting for over 98% of net buying in that category. They have been net buyers for 12 consecutive trading days.
This reflects a fragile structure: the entire market's bid rests on two companies' repurchase programs.
How long can the buybacks last?
Samsung's and Hynix's buyback windows run until November 21 and November 19, respectively — seemingly plenty of time.
But Goldman's quota-burn tracker shows that at the current execution pace, the funds will be exhausted around mid-October. This means → the nominal window stretches two more months, but the actual ammunition lasts roughly one.
Once buybacks wind down, secondary-market support reverts to routine institutional flow — and institutions are notably absent at current levels.
Will foreign investors step in?
Foreign net selling has narrowed: from ₩4.47 trillion and ₩4.86 trillion in May and June, down to roughly ₩1 trillion each in July and August.
The Korean won has appreciated 12.9% from its mid-year low, rising from 1,561.50 to 1,359.15 per dollar — creating a more favorable FX entry point for foreign allocators.
Goldman's view is blunt: whether foreign net inflows materially recover is the key structural variable for KOSPI in the second half. If foreigners don't pick up the bid after buybacks exit, the market faces a buying vacuum.
Have retail traders put a ceiling on the index?
Goldman observes that retail systematically buys below KOSPI 6,500 but rapidly trims positions whenever the index attempts to breach 7,000.
In plain terms = retail has drawn its own trading range — buy the dips, sell at 7,000. That effectively caps the index from above.
This means → even if foreign capital returns, KOSPI must first absorb retail selling pressure around the 7,000 level before it can break higher.
市场有风险，内容仅供研究参考，不构成投资建议。