I guess as an Apex customer , I got "more" attention but the only response
I got so far was a cookie cutter email.
When I sent my complain as a security issue , I sent detail information
 containing more than what they asked for in their reply:

"Thank you for reporting that you received spam e-mail at an e-mail address
 you use with TD AMERITRADE.

We take your privacy very seriously, and are conducting a thorough
investigation into this matter.

To help us get to the source of the spam, we would appreciate it if you would
reply to this message and provide the following:

-       The date the e-mail was received
-       The address the spam was sent to (your e-mail address)
-       The e-mail source (the ?from? address)
-       Whether this was the first occurrence

We sincerely appreciate your cooperation and patience as we work to get to the
 source of this.

If you?d like to learn about general tips about privacy and security,
you can visit the Security enter online. You?ll find it after you log on,
 under the Account menu.

Thank you,

Jason N.
Client Services, TD AMERITRADE
Division of TD AMERITRADE, Inc."

In the meantime , I changed my email address with them and opt out of any
third party info sharing that I could find. If that email address gets the
same SPAM , I am out.

Stephane