Callon Petroleum, Concho Resources and Jones Energy are rolling up assets and could be picked off themselves as M&A activity reignites in the oil sector.

KLR says it measures risk operationally, specifically what a company spends vs. what it produces, and the financially, including how much debt it has compared with EBITDA.

CEOs are aware of the overcapacity in the stock market and economy. That's why hardly a day goes by without a big takeover announcement.

Carrizo's market cap is just $2.67 billion, only slightly larger than Rosetta Resource's, which was bought by Noble Energy. This means Carrizo is an inexpensive acquisition target.

Rosetta Resources (ROSE) had its rating lowered to 'sector weight' from 'overweight' at KeyBanc this morning.

Here are today's top research calls.

While we're at it, here are a few more acquisitions that should happen right now.

Stocks ended Monday's trading session lower. The S&P 500 lost 11 points. The Dow Jones Industrial Average fell 86 points and the Nasdaq finished lower by 10 points.

Stocks closed lower on Monday after struggling throughout the day to stay in positive territory amid uncertainty over another bailout for Greece.

Home Depot closed out a busy week by naming CEO Ted Decker as chairman, unveiling a new $15 billion buyback and declaring a $1.90 per share dividend.

"Although we're confident in our ability to perform well in a range of market scenarios, we're mindful of the current macroeconomic trends," said CEO Gary Dickerson.

Deere's third quarter profits "reflected higher costs and production inefficiencies driven by the difficult supply-chain situation," said CEO John May.