Rules to curb violent stock swings are getting praise from some. But their slow introduction couldn't stop American Electric Power's 54% slide.

In the latest major shake-up at Sam Zell's Equity International real-estate investment firm, three senior executives resigned this week, raising new questions about the firm's future.

The fact that Caterpillar's North American shipments of its machines to dealers fell 18% in April bodes poorly for Friday's report of April U.S. durable-goods figures. But the picture isn't so dire.

AT&T has added a new monthly administrative fee of 61 cents to the bills of all of its contract wireless lines as of May 1, a move that could bring in more than a half-billion dollars in annual revenue to the telecom giant.

Gap notched a 43% rise in quarterly earnings as the apparel retailer kept up the momentum of its turnaround.

Cerberus is eyeing about a half-dozen grocery chains, including Harris Teeter Supermarkets, for potential bids, as the private-equity firm weighs whether to further expand its grocery business.

Education publisher Pearson announced details of Chief Executive John Fallon's plan to refocus the business on digital services and emerging markets.

McDonald's CEO Don Thompson, presiding over his first annual shareholders meeting since taking the helm, last summer, defended Ronald McDonald and the company's efforts to market to children.

Cablevision CEO James Dolan called the police on union protesters who disrupted the company's annual meeting.

Dover Corp. said it plans to spin off its fast-growing consumer-electronics unit that makes parts for smartphones like Apple's iPhone, in a surprising move to sharpen the company's focus on its industrial roots.