What does 'short selling' mean in financial trading? How is it actually carried out?

4. The rules governing China’s stock market and stock index futures market are misaligned: the stock market operates on a T+1 settlement basis, whereas index futures allow T+0 trading. This regulatory misalignment is one of the primary causes of a vicious cycle—profits from shorting index futures can be immediately reinvested to open new short positions on the same day, thereby perpetuating the cycle. However, the China Financial Futures Exchange (CFFEX) has been continuously reforming its rules. As A-shares become increasingly internationalized—for instance, following their inclusion in the MSCI indices—various institutional frameworks are expected to become more rational and aligned. Short selling in the Hong Kong stock market: Hong Kong permits short selling (i.e., securities lending and borrowing), and compared with mainland China’s annualized short-selling interest rates exceeding 8%, Hong Kong’s rates are significantly lower—largely because the Hong Kong dollar interest rate is at historic lows, with many short-selling rates hovering around just 2% per annum. Naked short selling—i.e., selling shares short without first borrowing them—is prohibited in Hong Kong. Moreover, not all stocks listed on the Hong Kong Stock Exchange (HKEX) are eligible for short selling; the HKEX publishes a daily list of approved short-sale-eligible stocks. To short sell in Hong Kong, investors must borrow shares via margin lending before selling them. Even if a given stock is approved for short selling by the HKEX, short selling remains impossible unless the investor’s brokerage holds that stock in its lending inventory. Short selling itself is operationally straightforward: the investor simply places a sell order; to close the position later, they merely buy back the same number of shares. Below is a practical guide to short selling in Hong Kong: Take Interactive Brokers (IB) as an example. IB offers direct short-selling functionality. Short selling a stock on IB is extremely simple—just select an eligible stock and place a sell order. So how do you determine which stocks can be shorted directly on IB? Follow these steps: After logging into IB’s web platform, click “Support” in the top navigation bar, then select “Tools.” You’ll see an option labeled “Shortable Stock (SLB) Lookup Tool”—click it to proceed. The tool displays three blank fields: - In the first field, “Symbol,” enter the stock code you wish to short (e.g., 1211); - In the second field, “Exchange,” specify the exchange where the stock is listed (e.g., for BYD, code 1211, the exchange is SEHK); - After filling both fields, click “Search.” The results will appear as follows: Several pieces of information here are particularly important: - “Quantity Available”: the number of BYD shares currently available for shorting on IB’s platform; - “Current Fee Rate”: the annualized interest rate for shorting BYD—currently 2.3%. Compared with mainland China’s short-selling financing costs, this is exceptionally favorable. Note, however, that the short-selling interest rate varies across stocks on IB, depending entirely on the supply of lendable shares—thus rates fluctuate according to market conditions. On the right side of this page, there is a button labeled “Historical Rates.” Clicking it reveals the annualized short-selling interest rates for the past nine trading days—including the average, lowest, and highest rates—providing useful reference data. Some stocks exhibit large rate fluctuations, but for 1211 (BYD), the rate has remained relatively stable, ranging between 1.9% and 2.6%. For retail investors, short selling is an extremely high-difficulty strategy. In theory, a stock’s price can rise without limit, exposing short sellers to potentially unlimited losses. Nevertheless, short selling proves highly effective in certain arbitrage strategies—for example, A/H share statistical arbitrage, rights issue arbitrage, and takeover offer arbitrage.

U.S. Equity Short-Selling Monitor, Issue #6 (2021.2.15)

In simple terms, buying stocks for profit involves purchasing shares when prices are low and selling them later when prices are higher. By contrast, profiting from short selling involves borrowing shares from another party at a high price, selling them immediately, then repurchasing them later at a lower price to return to the original owner. For further introductory explanations of short selling, please refer to Yiwiz’s tutorial site—details omitted here. course.yiwiz.com/zh/us_... The data primarily fall into two categories: 1. Short Interest This represents the total number of shares currently sold short. It is published every two weeks by each exchange—but only covers stocks listed on that particular exchange. 2. Short Volume This refers to the daily short-selling trading volume for individual stocks. It is published daily by FINRA (the Financial Industry Regulatory Authority) and by each exchange. To calculate the total short volume, one must aggregate FINRA’s data with those from all relevant exchanges. Yiwiz confidently states that virtually all online sources reporting “today’s short-sale volume as a percentage of total volume” rely solely on FINRA data—excluding exchange-level short-volume figures. A prominent example is the foreign website fintel.io. Short Volume and Short Interest are often confused. Here’s an illustrative example: Suppose Apple has issued only 10,000 shares outstanding, and I am the sole short seller. Today, I short 2,000 shares and cover (buy back) 500 shares before market close. Then today’s reported Short Volume is 2,000 shares, while the resulting Short Interest stands at 1,500 shares (some platforms may display this as 15%). As shown above, Short Volume tends to be meaningful only during extreme market conditions—because even large short-volume figures may be fully covered within the same day, revealing little about sustained bearish sentiment. Based on Yiwiz’s observation and inference, most Short Volume originates from market makers and intraday traders, since retail investors and institutions rarely engage in short selling. It is perfectly normal, for instance, to see Apple and Microsoft short volumes accounting for over 30% of their respective daily trading volumes. Yiwiz plans to publish future research analyses on Short Volume data. Compared to Short Volume, Short Interest carries greater analytical significance—yet because it is updated only every 10–15 days, its timeliness is limited. Consequently, it is far less effective than candlestick charts for trend analysis.

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