KOSPI Foreign Ownership Is High, But Samsung and SK Hynix Are at 2026 Lows

Tue, 26 May 2026 10:30:00 +0900

This is a follow-up to Korea Foreign Investor Flow Analysis. That note showed that most 2026 foreign selling was concentrated in Samsung Electronics and SK Hynix. This note asks the next question: how much ownership-based selling pressure is left?

TL;DR

KOSPI market-cap-weighted foreign ownership is still high. On the user’s benchmark series, it rose from 36.02% at the start of 2026 to 38.56% as of May 22.
Yet the two stocks actually being sold are already near 2026 lows. Research OS local DB shows Samsung Electronics foreign ownership falling from 52.37% to 48.32%, and SK Hynix from 53.81% to 51.62%.
That divergence exists because KOSPI ownership is value-weighted. Foreigners can sell shares, but if their remaining Samsung/SK Hynix positions surge in price, their market-cap-weighted KOSPI ownership can still rise.
The practical trigger is now flow speed: first stabilization needs KOSPI foreign ownership below roughly 38.2% plus five-day average foreign net selling below about KRW 1tn per day.

The Core Data

Item	Start of Year	Current	Change	Read
KOSPI market-cap-weighted foreign ownership	36.02%	38.56%	+2.54pp	Foreign-owned market value remains high
Samsung Electronics foreign ownership	52.37%	48.32%	-4.05pp	2026 low; 2022+ local DB low
SK Hynix foreign ownership	53.81%	51.62%	-2.19pp	2026 low, but not a long-term trough
Samsung Electro-Mechanics	37.63%	38.21%	+0.58pp	Less ownership pressure
Daeduck Electronics	15.96%	17.23%	+1.27pp	Looks more like accumulation

Yonhap Infomax reported that Samsung Electronics’ 48.32% foreign ownership was the lowest since September 2013, while SK Hynix’s 51.62% was the lowest since May 2023. It also reported YTD foreign net selling of KRW 50.2027tn in Samsung and KRW 34.2279tn in SK Hynix. (Yonhap Infomax)

Samsung’s historical anchor is much higher. In May 2019, Korea JoongAng Daily reported foreign ownership at 57.33%, above the prior 2001 record of 57.30%. (Korea JoongAng Daily)

Why The Aggregate Still Looks High

The KOSPI foreign ownership ratio is a market-value measure, not simply a share-count measure. Seoul Economic Daily explained the gap clearly: foreign selling pulled down the ratio, but price appreciation in foreign-held shares added even more to the ownership value. (Seoul Economic Daily)

That means the aggregate KOSPI ratio says foreign portfolio value is still heavy, while Samsung/SK Hynix share-count ownership says the two key positions have already been reduced materially.

Flow Is Still Not Calm

The problem is speed. From May 18 to May 22, foreigners net-sold KRW 14.4477tn in KOSPI. SK Hynix and Samsung represented roughly 73% of that one-week selling. From May 7 to May 22, foreigners net-sold KRW 46.3383tn, with Samsung and SK Hynix together accounting for 82.9%. (Daum / Energy Economy)

Research OS local all-listed-stock proxy points in the same direction:

Period	Total Foreign Net Buy	Samsung	SK Hynix	Two-Stock Share
May 18-22	-KRW 13.16tn	-KRW 5.28tn	-KRW 5.35tn	80.7%
May 7-22	-KRW 43.31tn	-KRW 18.94tn	-KRW 19.59tn	89.0%
Jan 2-May 22	-KRW 89.20tn	-KRW 50.41tn	-KRW 34.39tn	95.1%

So the ownership level is getting closer to a clearing point, but the flow is still too fast to call the selloff over.

Practical Framework

Stage	Conditions	Interpretation
Selling pressure remains	KOSPI foreign ownership above 38.5% and five-day average selling above KRW 2tn/day	Rebalancing still active
First stabilization	Below 38.2% and five-day average selling below KRW 1tn/day	Selling speed has slowed
Meaningful stabilization	Below 38.0% and Samsung/SK Hynix ownership stops falling	Mechanical selling largely absorbed
Re-buying setup	37.5-38.0% stable, foreign net buying for 3-5 sessions, KRW stabilizes	Korea beta can be re-entered

Investment Read

For Samsung Electronics, the foreign share-count ratio already looks low. Below 48% would look like a late-stage reduction signal. But the stock still needs foreign selling speed to slow before new money gets a cleaner entry.

For SK Hynix, 51-52% is a lower-neutral zone, not a full trough. A move toward 50.5-51.0% with price resilience would make the risk/reward more comfortable.

The final line is simple: KOSPI-level foreign ownership still argues for rebalancing pressure, but Samsung and SK Hynix ownership already argues that the selling is closer to exhaustion than the headline flow suggests. This is not a buy-now signal. It is a wait-for-flow-to-slow signal.

Disclaimer: For research and information purposes only. Not investment advice.