I seriously doubt Ameritrade would send out an alert like that so selectively.
I am a long time Ameritrade client and there has been no such communication from them.
Much as I would like to see such an announcement, such postings are eerily reminiscent of the same things we accuse the shorts on this board posting.
Sentiment: Strong Buy
This site works best as a forum for people to share real information in an effort to perform better together. The readily available misinformation here is harmful to the select few who happen to read it, and couldn't possibly really penetrate or impact the larger market. And I don't see what benefit arises from trying to trip nearby friends into the bonfire, just to gain a slight, short term improvement in local humidity. Makes no sense whatsoever to me.
I see Ameritrade has some up to date news on Pixie (as of yesterday) on their stock-specific page.
I'm surprised that they would send out selective alerts to their actual customers based on rumors. If you value customers enough to send out specific alerts, I doubt you would hit them with conjecture.
Regardless, this rumor hasn't moved the stock much...