I emailed them and got a reply from Mr. Ferguson, the President. He has confirmed that TradePMR is an introducing broker with them for over 10 years. He considers them to have a "sound reputation in the securities industry". He further confirms that they are the custodian and clearing firm for all of TradePMR's customer accounts.
So now the question is whether we can trust Stern Agee.
I have also emailed SIPC regarding both firms and will update when I get a response.
SIPC website - sorry for the delay, we are experiencing unusual call volume
Hmmm, wonder why? lol