NEW YORK -- Stocks that traded heavily or had substantial price changes Monday:

       CyrusOne Inc., up $4 to $89.45.

       KKR and Global Infrastructure Partners are buying the data center-focused real estate investment trust for $11.5 billion.

       CoreSite Realty Corp., up $5.92 to $172.51.

       American Tower is buying the data center owner for $10.1 billion.

       Dollar Tree Inc., up $16.15 to $129.23.

       Activist investor Mantle Ridge reportedly plans to push the discount retailer to take measures to increase its stock value.

       AECOM, up $1.89 to $72.66.

       The provider of technical and management-support services gave investors an encouraging financial forecast.

       Splunk Inc., down $30.44 to $137.38.

       The software company named Graham Smith as interim CEO to replace Doug Merritt, who is stepping down.

       Take-Two Interactive Software Inc., down $10.23 to $177.60.

       The publisher of “Grand Theft Auto” and other video games said its Private Division bought video game developer Roll7.

       Chevron Corp., up $2.59 to $116.82.

       U.S. crude oil prices edged higher and helped most energy stocks make gains.

       Restaurant Brands International Inc., up $1.19 to $58.40.

       The owner of the Burger King and Tim Hortons restaurant chains is buying Firehouse Subs for $1 billion.