How to Check China Merchants Bank Premium: A Beginner's Guide

I spent two days trying out a self-check for China Merchants Bank (CMB) A/H premium, then pulled several more days of data. An article on Huxiu said CMB's premium is loosening, so I tried following their method, putting A-share and H-share prices side by side to see if it's expensive or not. The steps below are suitable for beginners who haven't looked at financial reports.

PB (Price-to-Book) is the share price divided by net assets per share, giving a rough idea of whether it's expensive. The H/A premium rate indicates how much more expensive the HK stock price is compared to the A-share after converting to RMB; a positive number means HK is more expensive, negative means A is more expensive. First, open your usual market app, search for China Merchants Bank, click on the A-share and H-share quote pages separately, and copy the latest price, change percentage, and P/B ratio into a spreadsheet. If the software has an A/H premium indicator, record it directly; if not, calculate it manually: multiply the H-share price by the HKD/RMB exchange rate, subtract the A-share price, then divide by the A-share price. This lets you see the prices in both markets. News mentions CMB's PB is around 0.92x, which is relatively high among listed banks. The H/A premium rate was about 10% in February 2026 and about 11.27% on April 13, meaning HK shares are no longer cheap relative to A-shares.

Copying just one day's data is meaningless. On the third day, I pulled historical data. Open the daily K-line chart in the market software, find the AH or H/A premium page, and extend the timeline to one year. Record the A-share price, H-share price, exchange rate, and premium rate every Friday, adding a note about that day's news, such as earnings calls, banking sector movements, or capital flows. Sometimes the curve dips below the zero axis, sometimes it rises above. Some users on Xueqiu have visually experienced that when the A/H comparison ratio is low, CMB's stock price tends to rise, and when the ratio is high, the market sentiment weakens. My testing shows this pattern isn't absolute, but price differences do affect capital sentiment. Pitfalls occur here too. A positive H/A premium means HK is more expensive; it's easy to misinterpret the direction. Comparing HKD directly to RMB numbers can be misleading. Using old screenshots as today's prices doesn't work either; while bank stock volatility is low, exchange rates fluctuate. The solution is to record data after the close on the same trading day and unify everything into RMB terms.

After a week, the spreadsheet answers one question: Is CMB still enjoying a high valuation, and is that high valuation becoming increasingly difficult to sustain? The barrier to entry is low, taking ten minutes to complete, and it helps people step away from labels like "King of Retail" to look at real price spreads. However, the premium rate only explains the price relationship between the two markets, not whether CMB will definitely rise or fall in the future. A high PB doesn't necessarily mean it's expensive; it might just reflect market concerns about interest rate spreads or asset quality. This self-check is worth doing, but I don't recommend beginners trade directly based on the premium rate. It's better suited as a thermometer. CMB's PB remains somewhat expensive, and the inverted H/A premium also suggests HK capital isn't entirely pricing based on A-share sentiment. If CMB's performance is stable and pressure on interest rate spreads eases, the premium may gradually digest; if retail risks or involution in wealth management continue to suppress valuation, the loosening won't just be a price spread issue, but a downward shift in the valuation anchor. Next, you could compare CMB, Industrial Bank, and Ping An Bank together. Same time, same standard, comparing premium rates makes it clear who is still expensive and who has already loosened.