Here are Monday's top research calls, including upgrades for Blueprint Medicine, Gartner and Rockwell Collins and a downgrade for Boeing.
Technology research firm Gartner is acquiring CEB, which equips 90% of Fortune 500 companies with business research, for $2.6 billion in cash and stock.
Cramer is no fan of Chesapeake Energy and thinks Gartner has great growth.
Buying Yahoo!'s core assets is the start of something very big, Cramer says.