BlackBerry (BBRY) has jumped nearly 15% in about a week, and once again it’s buyout chatter that is the driving force behind BBRY stock.

This time, the report is a conspicuously anonymous report on Benzinga that China’s Lenovo Group (LNVGY) could be considering a purchase of BlackBerry.

So is BlackBerry back? Will BBRY stock continue to soar on this acquisition news, and will shareholders be bailed out?

In short: No way.

This latest rumor is just that — a rumor. And the bottom line is that BlackBerry’s core business is the thing to watch.

Lenovo Will NOT Buy BlackBerry

Any anonymous source should be treated with care. And considering the drumbeat of fruitless BlackBerry buyout chatter over the last few years, this topic automatically raises some red flags. Furthermore, considering the lack of information on that stub article written by Charles Gross on Benzinga, this specific report should be treated even more skeptically.

If that’s not enough, perhaps the biggest concern of all is the simple fact that Lenovo has serious practical hurdles to overcome for such a deal to take place. Consider that back in 2013, Lenovo hinted at interest in a BlackBerry buyout — back when the firm was called Research in Motion — after its CEO told Bloomberg, “We are looking at all opportunities — RIM and many others.”

But since then, Lenovo made a $2.9 billion acquisition of Motorola Mobility from Google (GOOG) in early 2014. LNVGY took on some serious debt as a result of the deal, which will limit its ability to gobble up another company even if it wanted to.

Now consider that BBRY stock is valued at $5 billion currently, a third the size of Lenovo at $15 billion, and the math starts to get sticky.

The final nail in the coffin here is that there are serious concerns about security should BlackBerry be acquired by Chinese tech giant Lenovo. BlackBerry CEO John Chen admitted as much to investors a while back, when he said a China-based buyout would probably be rejected because of “regulatory concerns.” Canada’s government hasn’t shown any signs of movement here, so even if the rumor is true and the money is there at Lenovo — which are big leaps — the deal still could get squashed.

Chew all this over before you consider buying BlackBerry stock on Lenovo buyout hopes.

BBRY Stock Challenged, But Stable

Click to Enlarge It’s worth noting that BlackBerry is in the midst of a second act after its crash to a single-digit share price at the end of 2013. BBRY stock is actually up 35% year-to-date in 2014 thanks to stability in its core business, a change of leadership and hints of success for the recently launched BlackBerry Passport.

There’s also some buzz about the BlackBerry Classic that should be released in November, with the hopes of connecting with old BBRY fanatics by hearkening back to the original appeal of BlackBerry gadgets (with some new twists, of course).

Revenue is still sliding, but the comps are about to get much easier considering the brutal decline in 2013. And while the company still is unprofitable, it is well capitalized with over $2.7 billion in cash and investments as of last quarter’s report.

The biggest appeal for BBRY stock holders should be the ability of BlackBerry to stabilize its device sales thanks to appealing to the enterprise crowd. And if you are interested in buyout rumors, consider the big valuations for messaging companies these days. Facebook (FB) bought WhatsApp for about $19 billion and SnapChat is rumored to be valued at $10 billion. BlackBerry’s secure messaging platform could fetch a pretty penny if and when it ever wants to shop for a buyer.

But CEO John Chen seems committed, for the time being, to stabilizing the core business of BBRY stock rather than looking for a buyer.

So any investors trading BlackBerry should follow his lead, and pay attention to what’s going on within the company … rather than chase anonymous, unfounded rumors of a possible BBRY buyout.

Jeff Reeves is the editor of InvestorPlace.com and the author of The Frugal Investor’s Guide to Finding Great Stocks. As of this writing, he did not hold a position in any of the aforementioned securities. Write him at editor@investorplace.com or follow him on Twitter via @JeffReevesIP.