Weekly stock screens
Market Radar
Separate stock screens from chart indicators and review market breadth, weekly breakouts, one-year winners, and market-cap concentration.
2026-05-15
Market breadth
KOSPI 25%
KOSPI 25% / KOSDAQ 11.5%
2026-05-15
52-week highs + turnover
한국쉘석유
20 names
2026-05-15
One-year return breakouts
대한광통신 3,834.8%
KOSPI 미래산업 / KOSDAQ 대한광통신
2026-05-15
KOSPI heavyweight concentration
60.1%
3,686.8T KRW
2026-05-15
Trading value spikes
동양고속
20 names
2026-05-15
Foreign + institution co-buy
하나마이크론
20 names
2026-05-16
US market breadth
NYSE 22.7%
NYSE 22.7% / NASDAQ 23.4% / AMEX 11.1%
2026-05-16
US 52-week highs + turnover
J.B. Hunt Transport Services, Inc.
11 names
2026-05-16
US mega-cap concentration
25.54%
28.7T USD
daily
KOSPI heavyweight concentration
Tracks how much of KOSPI market cap is concentrated in the largest names.
2026-05-15
Top 10
60.1%
KOSPI market cap share
KOSPI market cap share
Heavyweight concentration
| Rank | Name | Mkt Cap | Weight |
|---|---|---|---|
| 1 | Top 10 KOSPI Constituents - | 3,686.8T KRW | 60.1% |
| 2 | 삼성전자 005930 | 1,581.4T KRW | 25.78% |
| 3 | SK하이닉스 000660 | 1,296.4T KRW | 21.13% |
| 4 | SK스퀘어 402340 | 144.9T KRW | 2.36% |
| 5 | 삼성전자우 005935 | 143.9T KRW | 2.35% |
| 6 | 현대차 005380 | 143.3T KRW | 2.34% |
| 7 | LG에너지솔루션 373220 | 97.6T KRW | 1.59% |
| 8 | 삼성전기 009150 | 75.4T KRW | 1.23% |
| 9 | 두산에너빌리티 034020 | 71T KRW | 1.16% |
| 10 | HD현대중공업 329180 | 67.2T KRW | 1.1% |
| 11 | 삼성바이오로직스 207940 | 65.7T KRW | 1.07% |
Interpretation guide
How to read KOSPI heavyweight concentration
The KOSPI Heavyweight Concentration radar shows how much of the market is controlled by the largest constituents. It is useful when the index looks strong but investors need to know whether the move is broad or driven by a small number of dominant stocks.
Measurement rules
This radar calculates the combined market-cap weight of the largest KOSPI names. The higher the top-10 weight, the more sensitive the index becomes to a small set of heavyweights.
- Top 10 weight is the combined market-cap share of the 10 largest KOSPI constituents.
- Samsung Electronics and SK Hynix weight shows how much semiconductors drive the index.
- Individual weights provide a rough map of index influence.
How to interpret it
Rising concentration can make the index look stronger than the average stock. Falling concentration combined with better breadth is usually a healthier rotation signal.
- A rising top-10 weight points to large-cap leadership.
- A falling top-10 weight with improving breadth points to broader participation.
- High semiconductor concentration increases sensitivity to FX, U.S. tech, and memory-cycle news.
How to respond
When concentration is high, index ETFs and individual stock baskets can behave very differently. Investors should know which heavyweight risks their portfolio actually carries.
- Separate index-following decisions from small- and mid-cap stock-picking decisions.
- Set hedging rules if the largest constituents start to roll over.
- If concentration eases while turnover broadens, expand the rotation watchlist.
Related views
Related indicators and radar
KOSPI Index
Korea's large-cap benchmark for risk appetite and flow conditions.
Links concentration directly to the KOSPI benchmark move.
Market breadth
Advance-decline breadth, high-low balance, and trend participation.
Checks whether the rally is broad or concentrated in heavyweights.
KOSPI Margin Credit
Tracks retail leverage in KOSPI-listed large-cap names.
Checks whether retail leverage is building in large-cap names.