OPEC has finally reached a real deal to cap production levels — something that has been teased since February.

But the market’s initial move higher in response to the news faded, a sign Wall Street pros are growing nervous about the epic November rally that has, for one notable example, taken the Russell 2000 up 14 percent from its pre-election low.

The chatter from trading floors, according to Briefing.com updates, is growing concern over market valuations.

This is pushing back against what is actually a fairly solid result from OPEC, despite lingering concerns about non-OPEC participation and overall enforcement Read more.