Why does my mobile phone receive stock information for no reason?

Your mobile phone number has been used by others, and it may be sold by mobile to recover the arrears. Because it was bound in a brokerage firm before, the brokerage firm didn't know that the number owner had changed, so it continued to send text messages.

See if there is any brokerage company or information company written at the end of the message, check the customer service phone number online and call them and tell them not to send it again.