On September 22, Samsung Electronics and SK hynix led the KOSPI to a higher open, buoyed by strength in U.S. semiconductor stocks.
However, the same trend did not continue through the close, and SK hynix reversed into negative territory.
This is why the two stocks’ daily movements cannot be viewed as identical simply because they are grouped under the name “Samjeon-nix.”
3-line summary
1. “Samjeon-nix” refers to Samsung Electronics and SK hynix
2. Most of the intraday gains on the 22nd were given back
3. The closing price and intraday high must be considered together
KOSPI, which rose to 7171, closes at 7017
According to figures compiled by the Korea Exchange, the KOSPI closed at 7017.91 on September 22, up 0.15% from the previous trading day. The index opened at 7161.61 and rose as high as 7171.44 early in the session, but quickly narrowed its gains in the afternoon. The difference between the intraday high and the closing level was 153.53 points.
The advance was driven by strength in U.S. technology and semiconductor stocks. According to Digital Daily, in the previous New York session, the Nasdaq rose 2.3% and the Philadelphia Semiconductor Index gained 4.3%. In the domestic market as well, Samsung Electronics and SK hynix lifted the index early in the session.
However, a strong intraday opening is different from the closing performance. In the KOSPI market that day, individual investors were net sellers of 1 trillion 6089 hundred million won, while institutional investors turned from net buyers early in the session to net sellers by the close. Although the index finished in positive territory, 463 stocks declined, more than the 383 stocks that rose.
Samsung Electronics rises, while SK hynix ends lower
“Samjeon-nix,” the term used to refer to the two companies together, is a market abbreviation for Samsung Electronics and SK hynix. However, their directions diverged at the close on the 22nd.
SK hynix rose as high as 193 million 5000 won early in the session but closed at 184 million won, down 1.50% from the previous trading day. Samsung Electronics rose as high as 28 million 3500 won intraday and then narrowed its gains, but finished trading at 27 million 6500 won, up 0.91%.
There were also reports that both stocks were showing gains of around 3% early in the session. Therefore, it is difficult to judge the day’s final price movements solely from the intraday expression that “the two semiconductor leaders rose.” Particularly on days when a substantial portion of the index’s gains is reversed intraday, it is better to examine each stock’s closing price separately from its intraday high.
Strength in U.S. semiconductor stocks did not guarantee higher domestic closes
In the U.S. market that day, the popularity of Meta’s personal artificial intelligence (AI) agent “Muse” and expectations for AI investment were cited as factors behind the strength in technology stocks. According to a report by Korea Economic Daily, AMD rose 10%, Intel gained 12.1%, and Qualcomm climbed 9.3%.
Large domestic semiconductor stocks also opened higher under that influence, but changes in afternoon supply and demand and profit-taking selling altered the trend. In other words, even when the same overseas catalyst was present, it did not uniformly determine the closing direction of domestic stocks.
When interpreting stock-price movements, the most important point to watch is not the gain itself but when the price was recorded. When the opening surge, intraday high, and closing price differ, the closing price and changes in supply and demand during the process should be checked together rather than relying on the article headline’s expression of a rise.
References
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