🇰🇷 Korea Stock Market 4:30 PM Closing Briefing — September 17, 2026
Today, we prioritized the final HTS data provided by users after 3:45 PM and cross-checked it with closing reports from the Korea Exchange and Yonhap Infomax released after 4:00 PM. KOSPI 6,715.41(-0.04%), KOSPI200 1,058.27(-0.17%), KOSDAQ **822.18(+0.76%)** are consistent with the publicly released closing data. Maeil Business Newspaper
Today's key takeaway is **“Indices are almost flat, but internally, there was a day when foreign investors sold large-cap stocks in the spot market → hedged with futures → KOSDAQ and industrial cyclical stock rotation occurred simultaneously.”**
① Today's Market at a Glance
Indicator | 9/17 Final | Change | Judgment |
|---|
KOSPI | 6,715.41 | -0.04% | 🟡 |
KOSPI200 | 1,058.27 | -0.17% | 🟡 |
KOSDAQ | 822.18 | +0.76% | 🟢🟢 |
KOSDAQ150 | 1,392.99 | +0.40% | 🟢 |
K200 December Futures | 1,062.75 | +0.15% | 🟢 |
Futures High/Low | 1,072.20 / 1,056.20 | — | Peak Return |
Basis | +4.48p | — | 🟢 Contango |
Open Interest (OI) | 131,559 | -679 | ⚠️ Position Liquidation |
VKOSPI | 43.02 | -3.11% | 🟢↓, Absolute Level is High |
USD/KRW | 1,381.70 won | +4.70 won | 🔴 |
WTI | HTS 15:49 $100.81 | Intraday -1.58% | 🟢 Price Burden Relief |
The KOSPI rose to 6,795.53 (+1.15%) during trading but gave up all its gains. Meanwhile, the KOSDAQ rose for three consecutive trading days. Yonhap News
② Today's Market Quant Score
58 / 100 — Neutral+ / Cyclical Market
Composition | Score | Judgment |
|---|
KOSPI Price | 50 | 🟡 |
KOSDAQ Price | 70 | 🟢 |
Market Breadth | 61 | 🟢 |
Foreign Stock Purchases | 15 | 🔴🔴 |
Institutional Stock Purchases | 57 | 🟡🟢 |
Foreign Futures Purchases | 68 | 🟢 |
Open Interest Structure | 52 | 🟡 |
Basis | 78 | 🟢 |
Options | 52 | 🟡 |
Volatility | 61 | 🟢 |
Sector Rotation | 74 | 🟢🟢 |
Total | 58 | Neutral+ |
Macro Quant Score: 44 / 100
The Federal Reserve (Fed) raised the benchmark interest rate by **25bp to 3.75~4.00%** at the September Federal Open Market Committee (FOMC) meeting. Because the market had already reflected about 93.5% of the possibility of a hike, the impact was limited, but the possibility of further tightening remained. Maeil Business Newspaper
Meanwhile, international oil prices fell by 3.21% for WTI and 2.69% for Brent crude due to the possibility of Saudi Arabia bypassing crude oil supplies. This is a clear macroeconomic buffer for the Korean market today. Yonhap News Agency
③ Foreigners and Institutions' Real Trading
Based on the final HTS amount.
Market | Individuals | Foreigners | Institutions |
|---|
KOSPI | +5,106 billion won | 🔴 -2.456 trillion won | 🟢 +241.1 billion won |
KOSDAQ | -27.8 billion won | -33.9 billion won | 🟢 +47.1 billion won |
According to the Korea Exchange and Yonhap Infomax, foreigners' net selling of KOSPI amounted to -2.2803 trillion won, individuals bought 4.137 billion won, and institutions bought 1.587 billion won. The difference from HTS is considered due to differences in collection time and classification criteria, but the direction is the same. This report prioritizes the later HTS final value.
Maeil Business Newspaper★ Key Points
Foreigners sold more than **2 trillion won worth of stocks**, but the KOSPI only fell by **-0.04%**.
Other legal entities bought about **1.7 trillion won net**, and institutions also bought, absorbing a significant portion of foreign selling.
Maeil Business Newspaper
④ KOSPI200 Futures·OI·Basis·Program
Futures Trading
Subject | Net Buying |
|---|
Individuals | -54.1 billion won |
Foreigners | 🟢 +4.879 billion won |
Institutions | -4.199 billion won |
Financial Investment | -1.860 billion won |
Private Equity Funds | -1.777 billion won |
The most important combination today.
Foreigners' Spot -2,456.6 Billion Won
↕
Foreigners' Futures +4.879 Billion Won
In other words, foreigners are in opposite directions in spot and futures.
Therefore, interpreting foreigners' spot selling as a strong downward bet is not accurate.
Possible Position Structures
Interpretation | Probability |
|---|
Spot reduction + Maintaining market exposure/hedge adjustment through futures | 35% |
Existing short position covering (Short Covering) | 30% |
Building new long positions (Long Build) | 20% |
Basis/Arbitrage trading | 15% |
★ Open Interest (OI)
Previous day:
132,238
→ Final:
131,559
In other words, it is a decrease of -679 contracts.
However, the intraday structure is more important.
Intraday high 134,529 → Intraday low 133,084 → Final 131,559
.
Futures:
1,072.20 → 1,056.20 → 1,062.75
.
Interpretation
Today is different from yesterday's:
Price↑ + OI↑
. Today is:
Small price↑ + OI↓
. Therefore, the evidence for building new long positions (Long Build) has weakened compared to yesterday, and a structure with more existing short position covering (Short Covering) and existing position adjustments is mixed.
Especially since foreigners bought +4.879 billion won worth of futures, the fact that the total OI decreased suggests a higher possibility that a significant portion of foreigners' futures buying was not new Longs but rather Short Covering.
Basis
Futures:
1,062.75
K200:
1,058.27
+4.48p
This is a fairly strong Contango.
In other words, the derivative market is relatively stronger than the spot market.
Program Trading
On user HTS, all cumulative net selling positions are observed for:
Overall, Differential, and Non-Differential programs.
Non-differential selling is the largest.
Since the exact final amount has not been cross-checked with reliable publicly available final values by 16:30:
Data Unconfirmed
.
⑤ Options Market
HTS amount basis:
Subject | Call | Put | Assessment |
|---|
Individual | -800M | -500M | Dual shorting |
Foreigners | +700M | +2.4B | ⚠️ Concurrent downside protection |
Institutions | +600M | -1.6B | Relative strength |
Foreigners bought futures for +487.9 billion, but at the same time put(Put) +2.4 billion.
Therefore:
Futures purchase = Strong upside betting
is difficult to conclude.
Rather, the interpretation of Short Covering + maintaining downside insurance fits the current data better.
Key Strike Prices
From user HTS:
October 1,050 Call
Closing price 40.60
OI 1,478
Previous day 1,455 → +23
October 1,060 Put
Closing price 40.25
OI 101
Previous day 75 → +26
In particular, the increase in 1,060 Put OI shows that downside defense demand around 1,060 has increased somewhat.
The overall put-call ratio (PCR) is unconfirmed data because we could not reliably secure final total trading volume and OI.
⑥ Semiconductors and Major Leading Stocks
Today, semiconductors took a break.
Samsung Electronics 252,500 won -0.39%
SK Hynix 1,745,000 won -0.80%
closed. Maeil Business Newspaper
Instead, funds moved elsewhere.
HD Hyundai Heavy Industries +6.58%
Hanwha Aerospace +3.98%
Doosan Enerbility +1.91%
KB Financial +1.41%
were strong. Newsis
In today's KOSPI sectors, transportation equipment and parts +2.40%, machinery and equipment +1.97%, transportation and warehousing +1.77% were strong, and electrical and electronics were -0.57%. Newsis
That is, today's sector rotation was clearly:
Semiconductors → Shipbuilding·Defense·Machinery·Finance
.
⑦ 12 Fixed Sectors Quant
Rank | Sector | Score | Relative Strength (RS) | Characteristics·Supply and Demand | Short Term |
|---|
1 | Shipbuilding | 78 | ↑↑ | HD Hyundai Heavy Industries leading | 🟢🟢 |
2 | Defense·Aerospace & Defense | 74 | ↑↑ | Hanwha Aerospace strong | 🟢 |
3 | Robotics·Machinery | 70 | ↑↑ | Machinery industry +1.97% | 🟢 |
4 | Finance·Securities·Insurance | 65 | ↑ | Bank stocks strong | 🟢 |
5 | Construction·Nuclear Power·Energy | 63 | ↑ | Doosan Enerbility strong | 🟢 |
6 | Bio·Pharmaceuticals | 62 | ↑ | KOSDAQ strong | 🟢 |
7 | Automotive·Parts | 59 | ↑ | Transportation equipment strong | 🟡🟢 |
8 | Power Equipment | 56 | → | Short-term consolidation | 🟡 |
9 | Cosmetics·Beauty | 53 | → | Stock differentiation | 🟡 |
10 | Secondary Batteries | 49 | →↓ | Some material stocks weak | 🟠 |
11 | Semiconductors·AI | 46 | ↓ | Profit taking | 🟠 |
12 | Internet·AI·SW | 43 | ↓ | Interest rate sensitive | 🔴 |
8 ★ Top 15 Sectors for Today & Key Stock Signals
Rank | Daily Sector/Theme | Q | Representative Tracking Stock | Signal(Signal) | Continuity |
|---|
1 | Shipbuilding | 82 | HD Hyundai Heavy Industries·Hanwha Ocean·Samsung Heavy Industries | 🔥 Leading | High |
2 | Defense·Aerospace & Universe | 78 | Hanwha Aerospace·LIG Nex1·Korea Aerospace Industries | 🔥 Leading | High |
3 | Machinery·Industrial Materials | 74 | Doosan·HD Hyundai Infracore·Hyundai Elevator | 🟢 Strong | Medium-High |
4 | Nuclear Power·Power Generation | 72 | Doosan Enerbility·Korea Electric Power Corporation Technology·Uri Technology | 🟢 Strong | Medium-High |
5 | Robot·Automation | 69 | Rainbow Robotics·Robotis·Doosan Robotics | 🟢 | Medium-High |
6 | Bank | 66 | KB Financial·Shinhan Financial Group·Hana Financial Group | 🟢 | Medium-High |
7 | Bio·Pharmaceutical | 65 | Samsung Biologics·Alteogen·Rigel Pharmaceuticals | 🟢 | Medium-High |
8 | Transportation·Logistics | 63 | Hyundai Glovis·HMM·Korean Air | 🟢 | Medium |
9 | Securities | 60 | Mirae Asset Securities·Korea Investment Holdings·Kiwoom Securities | 🟡🟢 | Medium |
10 | Automobile·Parts | 58 | Hyundai Motor·Kia·Hyundai Mobis | 🟡🟢 | Medium |
11 | Power Equipment·Power Grid | 56 | HD Hyundai Electric·Hyosung Heavy Industries·LS ELECTRIC | 🟡 | Medium-High |
12 | Medical·Healthcare | 55 | Samsung Biologics·Parma Research·Hugel | 🟡 | Medium |
13 | Cosmetics·Beauty | 52 | Amorepacific·COSMAX·Korea Kolmar | 🟡 | Medium |
14 | Semiconductor·HBM | 46 | Samsung Electronics·SK Hynix·Hanmi Semiconductor | 🟠 Watch | Medium-High |
15 | Secondary Battery Materials | 45 | Ecopro BM·POSCO Future M·L&F | 🟠 | Medium |
In the actual closing data, HD Hyundai Heavy Industries +6.58%, Hanwha Aerospace +3.98%, Doosan Enerbility +1.91%, Samchundang Pharmaceutical +4.74%, Rainbow Robotics +1.18% are confirmed. Meanwhile, Ecopro BM and some semiconductor equipment stocks were weak. Newsis
⑨ KOSPI / KOSPI200 Technical Structure
Today's KOSPI:
6,779.02 opening
→ 6,795.53 high
→ 6,697.85 low
→ 6,715.41 closing
is. Yonhapnews
In other words, Gap Up → Failed Rally → Gave back all intraday gains.
It's not a good candlestick in the short term.
However, the fact that it held above the 6,700 line despite foreigners selling over 2 trillion won is positive in terms of downside absorption power.
⑩ Elliott/Neely + Wyckoff + Volume Profile
Today's K200 Futures Volume Concentration Zones:
Price Range | Proportion |
|---|
1,074.65~1,072.81 | 2.19% |
1,072.80~1,070.95 | 2.61% |
1,070.94~1,069.09 | 5.04% |
1,069.08~1,067.24 | 11.89% |
1,067.23~1,065.39 | 13.79% |
1,065.38~1,063.53 | 11.32% |
1,063.52~1,061.67 | 17.06% |
1,061.66~1,059.82 | 17.33% |
1,059.81~1,057.97 | 15.87% |
Core Value Area
1,059~1,064
is.
The current closing price of 1,062.75 is exactly within this range.
🟡 Scenario A — Box Range + Rotation Trading
45% — Base Scenario
1,056~1,060 support
→ Continued rotation trading in KOSDAQ·Shipbuilding·Defense·Machinery
→ KOSPI 6,650~6,800
Invalidation:
Futures 1,055 downside breakout + Foreigners selling both spot and futures
🟢 Scenario B — Rally Resumes
30%
Conditions:
1,065 recovery → 1,072 breakout
Target:
1,080 → 1,090
Invalidation:
1,059 Re-entry
🔴 Scenario C — End of Rebound
25%
Conditions:
1,056↓
Target:
1,050 → 1,040 → 1,035
Invalidation:
1,065 Recovery
⑪ Key Support and Resistance for the Next Trading Day
K200 Futures | Meaning |
|---|
1,085~1,090 | Major Resistance |
1,072~1,075 | 🔴 Today's High |
1,065~1,068 | 1st Resistance |
1,061~1,064 | ⭐ Maximum Trading Concentration |
1,057~1,060 | ⭐ Key Support |
1,050~1,052 | 2nd Support |
1,040~1,045 | Major Support |
1,034~1,035 | Final Defense Line |
The most important price for the next trading day is 1,060.
⑫ Risks to Be Most Aware Of
The first is continued selling of foreigner spot. As of today's public standard, it is -2.2803 trillion won, and as of the HTS final standard, it is -2.4566 trillion won. Maeil Business Newspaper
The second is additional tightening by the Federal Reserve (Fed). Although a September interest rate hike has been largely priced in, further hikes remain. Maeil Business Newspaper
The third is the won/dollar exchange rate in the 1,380 won range.
On the other hand, today's risk was significantly mitigated by falling oil prices. WTI and Brent fell 3.21% and 2.69%, respectively, due to Saudi Arabia's detour supply movement. However, this does not mean that the Middle East supply risk itself has been resolved. Yonhap News Agency
⑬ Final Market Dashboard
Indicator | Status |
|---|
Market Quant | 🟡🟢 58/100 |
Macro Quant | 🟡 44/100 |
KOSPI Trend | 🟡 |
KOSDAQ Relative Strength | 🟢🟢 |
Foreigner Cash | 🔴🔴 |
Institution Cash | 🟢 |
Foreigner Futures | 🟢 |
Open Interest(OI) | 🟠 -679 |
Price/OI | 🟡 Price↑·OI↓ |
Basis | 🟢🟢 +4.48 |
Foreigner Options | 🟠 Put Buying |
Program | 🔴 |
Volatility | 🟢↓ |
Shipbuilding Relative Strength | 🟢🟢 |
Defense Industry Relative Strength | 🟢🟢 |
KOSDAQ Relative Strength | 🟢🟢 |
Semiconductor Relative Strength | 🟠 |
Market Regime(Regime) | Neutral + Strong Sector Rotation Trading |
⑭ Today's Key Conclusions
Today **KOSPI -0.04%** alone cannot explain the market.
The most important combination is:
Foreigner Cash -2.46 trillion
Foreigner Futures +487.9 billion
Futures +0.15%
OI -679
Basis +4.48
Foreigner Put +2.4 billion
.
Combining this, it is difficult to conclude that foreigners have aggressively built new short positions in the entire Korean market.
Rather than reducing large positions on a large scale while maintaining some market exposure as gifts, or liquidating existing Shorts and simultaneously hedging downside risk with Puts, position adjustments are more likely.
However, it is still premature to interpret this as a shift in risk appetite (Risk-On) for foreigners. The decisive reason is that OI decreased by -679 contracts.
In other words, among the 487.9 billion won of foreign futures today, it is possible that a significant portion included new long position building (Long Build) rather than existing short position liquidation (Short Covering).
And in the spot market, a more important change has emerged.
Semiconductors → Shipbuilding·Defense·Machinery·Nuclear Power·Finance
The leadership has shifted.
At the same time, **KOSDAQ +0.76%** significantly outperformed KOSPI. In fact, Transportation Equipment·Parts +2.40%, Machinery·Equipment +1.97%, HD Hyundai Heavy Industries +6.58%, Hanwha Aerospace +3.98% confirm this. Newsis
Therefore, the current market situation is best seen as large semiconductor profit-taking + strong sector rotation (Sector Rotation) rather than a downtrend or a full-fledged uptrend.
The order of priority to check on the next trading day is ① K200 futures 1,060 defense → ② Decrease in foreign stock selling → ③ Continuation of foreign futures buying → ④ Price↑+OI↑ conversion → ⑤ Expansion of market breadth (Breadth) from shipbuilding·defense·machinery to bio·robots.
Currently, a strategy of selecting stocks within the leading sector rather than chasing purchases is more appropriate. In particular, if futures break through 1,065~1,072 with an increase in OI, it can significantly increase the probability of an upside scenario. However, if 1,056 is broken + foreign futures selling conversion + OI increase occur simultaneously, defense should be strengthened again.
