Cat’s big buy

Caterpillar staked a claim in the booming global mining industry with a $7.6 billion deal to buy Bucyrus Interna tional for $92 cash per share, a 32 percent pre mium over Friday’s clos ing price.

Icahn shift

Activist investor Carl Icahn acquired stakes in Mattel and Masco and sold the remainder of his shares in Yahoo! in the third quarter, a regula tory filing showed.

Blackstone

Blackstone Group de fended its $543 million bid for power company Dy negy, criticizing Icahn, who opposes the deal.

Buffett shuffle

Warren Buffett’s Berkshire Hathaway no longer held stakes in Carmax, Home Depot or Republic Services as of Sept. 30, according to a regulatory filing. Buffett added to his po sition in Wells Fargo and took a new stake in Bank of New York Mel lon.

Bank hearings

Banks under fire over their foreclosure prac tices face twin hearings in Congress this week: today and Thursday.