Cigna, Martha Stewart, Williams, American Airlines and Epizyme are big market movers

Associated Press

Stocks that moved substantially or traded heavily Monday on the New York Stock Exchange and the Nasdaq Stock Market:

NYSE

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Cigna Corp., up $7.34 to $162.60

The health insurer rejected a $47 billion buyout offer from rival Anthem Inc., saying the terms of the deal were inadequate.

Williams Cos., up $12.52 to $60.86

The gas pipeline company rejected a $48 billion takeover offer from Energy Transfer Equity but said it may still be for sale.

Martha Stewart Living Omnimedia Inc., down 86 cents to $6.12

Sequential Brands Group Inc. is buying the media and merchandising company for about $353 million in a cash-and-stock deal.

National Bank of Greece SA, up 20 cents to $1.30

The bank's stock gained ground on hopes that there will be a breakthrough in Greece's bailout negotiations with creditors.

Nasdaq

American Airlines Group Inc., up $1.47 to $43.03

The airline and its rivals saw shares rise after two analysts suggested that investors are too gloomy about the shares.

Epizyme Inc., up $5.23 to $25.98

The biotechnology company reported positive data from an early stage clinical trial of a cancer treatment.

American Micro Devices Inc., up 4 cents to $2.62

The chipmaker hired a consulting firm to review whether the company should split its business, according to a Reuters report.

Noodles & Co., down 58 cents to $16

The casual restaurant operator's president and chief operating officer is leaving to become CEO of an unnamed restaurant business.