How much does it cost to buy one share of stock? Basic trading logic analysis of how many shares are in one lot

Why Are Taiwan Stocks Much More Expensive to Buy and Sell Than US Stocks? The Key Difference Is in Trading Units

Many new investors will notice a phenomenon: the purchase thresholds for the same company’s stock are vastly different between Taiwan stocks and US stocks. The underlying reason may seem complex, but it actually stems from the fundamental difference in trading units used in the two markets.

Taiwan’s stock market uses a “lot” as the basic unit for whole-share trading, 1 lot equals 1000 shares. In contrast, US stocks are traded per “share,” allowing investors to buy in individual shares. This difference creates completely different entry barriers for the two markets.

Understanding Stock Prices: The Market’s Real-Time Reflection of Value

Stock price represents the market’s valuation of a single share at a specific moment. It is not static but fluctuates based on the real-time transaction prices between buyers and sellers.

For example, as of August 2023, Tesla (TSLA) stock was priced at $254.11, whereas in January of the same year, it was only $101.81. In just a few months, the value of the same stock more than doubled. This illustrates the power of stock prices—they directly reflect the market’s assessment of a company’s future prospects.

The Taiwan stock market follows a similar pricing mechanism. For instance, in April 2024, Taiwan Cement (1101.TW) was trading at NT$32.10 per share. Stock prices are adjusted in real-time based on supply and demand during trading hours. When investors ask “how many shares are in one lot,” they are referring to the number of shares, and the actual cost depends on the current market price multiplied by the number of shares.

From One Share to One Lot: Taiwan’s Unique Calculation Method

Calculating the cost of one lot in Taiwan stocks is simple: stock price × 1000 = total amount for one lot

Taking TSMC as an example, if the stock price is NT$561, then buying one lot of TSMC requires paying NT$561 × 1000 = NT$561,000, roughly 560,000 NT dollars. For most retail investors, this is a significant amount.

In contrast, the same company’s stock listed in the US, TSMC (TSM), has a stock price of about $95, meaning buying one share costs only $95 (about NT$3,000). The difference in trading thresholds is obvious.

The Emergence of Fractional Trading: Breaking the “Minimum One Lot” Barrier

To allow more retail investors to participate, Taiwan’s stock market introduced fractional trading. Fractional trading refers to buying and selling less than one lot (1–999 shares).

Full lots and fractional trading each have their advantages and disadvantages. Full lots offer high liquidity but require a higher capital threshold; fractional trading lowers the entry barrier but has relatively lower liquidity because it uses a periodic auction system (matching occurs every 1 minute). The after-hours trading for full lots is from 14:00 to 14:30, while fractional trading begins earlier at 13:40.

Comparing Trading Systems: US vs. Taiwan Stocks

The Three Major Factors Driving Stock Price Fluctuations

Stock prices are not decided out of thin air but are the result of multiple forces acting together.

Company fundamentals form the foundation of stock prices. Financial health, profitability, and future prospects are reflected through financial reports. Companies with strong performance naturally attract buying interest, pushing their stock prices higher.

Macroeconomic environment influences overall market expectations. Indicators such as GDP, interest rate policies, and unemployment rates affect investor confidence.

Market sentiment is often the most immediate driver of short-term price movements. Negative news, geopolitical risks, or global economic events (like pandemic shocks) can trigger panic selling, leading to declines in the broader market.

Once you understand these basic concepts, you hold the key to entering the stock investment world. Whether choosing full shares or fractional shares in Taiwan, or flexible buying in US stocks, you can make smarter decisions based on your own capital situation.