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New York • Stocks that moved substantially or traded heavily on Thursday:

• AmSurg Corp., up 93 cents to $78.43

The ambulatory surgery center operator said it will combine with ambulance service and emergency health care company Envision Healthcare Holdings.

• Newmont Mining Corp., down 63 cents to $35.61

Mining companies traded higher as the price of gold continued to rise.

• Kroger Co., down 24 cents to $35.47

The supermarket chain's first-quarter profit was larger than Wall Street anticipated.

• Macy's Inc., up 41 cents to $32.35

The retailer announced a tentative deal with union representing workers at its flagship New York City store, avoiding a possible strike.

• Cavium Inc., down $8.40 to $36.90

The chipmaker said it will buy computer networking equipment supplier QLogic for $15.50 per share, or about $1.29 billion.

• Marathon Oil Corp., down 39 cents to $12.67

Energy companies struggled again as oil prices slumped for the sixth day in a row.

• Merck & Co., up $1.41 to $57.50

The company said its drug Keytruda extended the lives of patients with lung cancer in a clinical trial.

• Consolidated Edison Inc., up 64 cents to $77.95

Utility companies outperformed the market as bond yields kept falling, which made utility stocks more attractive.