What does it mean to show ~ (placard) on the stock of Bank of Communications? Is it good or bad?

It's good to be placarded.

It shows that other people are optimistic about this stock, which will generally lead to a short-term rise in the stock price, and what's more, it will lead to a big shareholder vying for control, which will lead to a greater increase. However, the stock price will eventually follow the fundamentals, and a listed company that actively creates profits is the driving force for the stock price to rise. However, it is also possible that competitors maliciously raise cards and compete for controlling shares, which is not conducive to the stability of the company.

"Listing" means acquisition. Specifically, when the tradable shares obtained by investors in the secondary market of the securities market exceed 5% or an integer multiple of 5% of the total share capital of the stock, according to the provisions of relevant laws and regulations, they must immediately notify listed companies, stock exchanges and securities regulatory agencies, make an announcement in the newspapers and periodicals designated by the securities regulatory agencies, and fulfill their obligations stipulated by relevant laws.