I know if you look at the back it lists this with Falcon Financial Partners/ this might not have to do with CBAI / but since you own stock, you are probably on their mailing list. I know not everyone got this only the ones that are in this stock.
It is like spam mail to use as an example. if you order something online your info is out there for everyone to see, then you get hit with spam mail from other external companies especially if you use your email address