Samsung Electronics: Why Foreign Net Buying Figures Differ Between KRX and Nextrade, and How to Check
For large-cap stocks with heavy foreign trading, such as Samsung Electronics and SK hynix, looking only at the foreign net buying amount can leave out important parts of the picture. This is because the Korea Exchange (KRX) and Nextrade (NXT) may use different scopes when aggregating trades. To check whether foreign investors are actually buying, first align the market data and date range.
Why Foreign Net Buying Figures Differ Across Brokerage Apps
Foreign net buying is the amount foreign investors purchased minus the amount they sold.
Foreign net buying = purchase amount − sales amount. A positive result means net buying; a negative result means net selling.
However, the amount can differ depending on the screen you check, even for the same stock, such as Samsung Electronics. Here are three key things to check:
Whether NXT trades are included
Whether the figure is a provisional intraday estimate or a post-market closing figure
In particular, domestic stock trades can take place on either the Korea Exchange or Nextrade, an alternative trading venue. If a figure that covers only one market is interpreted as foreign trading across the entire market, it may differ from the actual trend.
How to Check Foreign Net Buying in Samsung Electronics on KRX
The Korea Exchange's official statistics service, KRX Data Marketplace, lets you look up investor-by-investor trading activity for Samsung Electronics and SK hynix.
The lookup steps are as follows.
1Step. Go to KRX Data Marketplace.
2Step. Navigate to the following menu.
Statistics → Basic Statistics → Stocks → Trading Performance → Trading by Investor (Individual Stocks)
3Step. Select Samsung Electronics or SK hynix.
4Step. Set the date range, then check foreign investors’ sales, purchases, and net buying under the trading value items.
basicidea.tistory.comOn the official KRX screen, you can select either a period total or a daily trend. It also provides trading activity by investor category, in addition to the foreign-investor total, so it is important to check which items are selected. Data Marketplace+1
Should You Check Nextrade Foreign Trading Separately?
Yes. You can also look up trading activity by investor separately on Nextrade.
Use the following menu on Nextrade’s official website.
To check investor-by-investor trading activity on Nextrade, follow these steps:
1. Go to the Nextrade website.
2. Select the Trading Activity menu.
3. Go to Trading by Investor (Regular Market).
4. Set the date you want to look up.
5. Check foreign investors’ trading volume and trading value for sales and purchases.
x.comNextrade’s official screen shows trading volume and trading value separately by investor. You can select a date range of up to 3 months. Nextrade+1
The key is to compare trading activity on KRX and NXT over the same period and using the same unit.
What Happens If You Add KRX and NXT Net Buying Figures Together?
For a stock traded on both markets, you can check foreign net buying separately for each market and then add the amounts together.
The calculation is as follows.
KRX = purchase amount − sales amount; NXT = purchase amount − sales amount; Total = KRX + NXT. Here is a calculation using hypothetical figures to make the method easier to understand.
The figures below are a calculation example, not actual trading activity in Samsung Electronics or SK hynix.
| Category | Foreign net buying |
|---|---|
| KRX | +KRW 50,000,000,000 |
| NXT | -KRW 20,000,000,000 |
| Combined | +KRW 30,000,000,000 |
The author's calculation gives KRW 30,000,000,000 after subtracting KRW 20,000,000,000 from KRW 50,000,000,000.
In this example, looking only at KRX makes it appear that foreign investors net bought KRW 50,000,000,000, but including NXT trades reduces the net buying amount to KRW 30,000,000,000.
Conversely, foreign investors may be net sellers on KRX and net buyers on NXT.
So it is best not to conclude from figures for just one market that foreign investors have bought or sold heavily.
Before adding the figures together, however, check that the investor categories, stocks covered, trading dates, and trading value units match across both screens.
Can the Share Price Fall Even When Foreign Investors Are Net Buyers?
A stock price does not necessarily rise just because foreign investors are net buyers.
Stock prices are influenced not only by foreign trading, but also by individual and institutional trading, overall market sentiment, earnings outlook, exchange rates, and shifts in investment flows between industries.
Samsung Electronics and SK hynix are large-cap stocks that are particularly sensitive to the semiconductor cycle and expectations for AI investment, so it is difficult to judge their direction based on foreign net buying alone.
It is best to look at these three things together.
First, whether net buying is sustained
Compare the trend over several trading days rather than looking at a single day's net buying. Check whether a large-scale sell-off follows the next day after a day of buying.
Second, the relationship between share price and trading volume
Compare whether the share price rises or instead falls while foreign investors are net buyers. The market interpretation may differ depending on how the share price responds, even when the net buying figure is the same.
Third, the trading direction of institutions and individual investors
Even when foreign investors are buying, the share price may fall if institutional or individual investors are selling more.
Foreign net buying is a trading result; it does not mean foreign investors are confident that the share price will rise in the future.
Why Intraday Foreign Net Buying Figures Differ from Post-Market Figures
It is also important to distinguish intraday trading flows from the final figures.
According to the Korea Exchange's guidance on trading activity by investor for individual stocks, that day's regular-market trading details are reflected at around 3:45 p.m. after the market closes, while final trading details, including after-hours trading, are provided at around 8 p.m. after the day's trading ends.
Therefore, figures checked during the trading day may differ from the final figures after the market closes. Data Marketplace
When keeping a record of trading flows, it is helpful to note the following details:
Lookup date
Lookup time
Foreign net buying amount
Whether regular-market or after-hours trading is included
Whether the figure is a provisional intraday estimate or post-market data
Keeping these details helps avoid mistakenly comparing figures checked at different times.
What to Keep in Mind About Foreign Trading in Samsung Electronics and SK hynix
After a sharp drop in large-cap semiconductor stocks, many investors want to check foreign trading flows. The key, however, is not just the net buying amount, but which trades that figure includes.
It is helpful to check the following in order:
1. Check foreign trading by stock on KRX
2. Check investor-by-investor trading on NXT for the same date
3. Add the figures if they can be compared on the same basis
4. Recheck the final figures after the market closes
5. Compare the trend over 5 trading days or more with the share price and trading volume
Foreign trading flows are one of the factors that can inform investment decisions. They are not a reliable indicator for making definitive predictions about a company's performance or future share price. Keep in mind that figures may differ by market and by when the data is released.
※ This article provides information for understanding market trends and is not an investment recommendation for any specific stock or asset. You are responsible for your final decisions and investments.