Let me try to clarify this subject for you and after 32 years in the business (retired now) this is how it works.
Depending on the broker you use and the documents you signed to open that account, it will depend on if your broker uses the OBO or NOBO rules.
Most online brokers use the NOBO rule because they want to charge you fees for them controlling all communications between the company and its shareholders. Ever get a prospectus from your broker through an email notification on your account? Well if you did then you know the broker is using NOBO.
If you have a certificate, no broker is ever involved because the T/A has your name, address etc.
If your broker uses OBO, then you get these mailings directly from the company or through a TPA who they have contracted to send out the information based on their OBO list.
It is simple to understand. JMHO