Stocks that moved substantially or traded heavily on Monday:
Gigamon Inc., up $3.55 to $42.85
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Reuters reported that the networking hardware company will soon hold talks with potential buyers.
Forestar Group Inc., up $1.80 to $16
Homebuilder D.R. Horton offered to buy a 75 percent stake in the real estate and natural resources developer for $16.25 a share.
Loxo Oncology Inc., up $21.14 to $70.12
The drug developer reported encouraging results for larotrectinib, an experimental drug that targets a rare genetic tumor abnormality.
Herbalife Ltd., down $4.93 to $68.99
The nutritional supplement company lowered its forecasts because a switch to new sales tactics is affecting its business.
Occidental Petroleum Corp., down 64 cents to $60.06
Energy companies slumped with oil prices as several nations cut diplomatic ties with Qatar.
CVS Health Corp., down 26 cents to $78.79
Companies that make or sell common household goods did worse than the rest of the market on Monday.
Macerich Co., down $1 to $56.80
Real estate investment trusts and other high-dividend companies slipped as bond yields rose.
State Street Corp., up 39 cents to $83.07
Bank stocks rose in tandem with bond yields, which allow banks to charge higher interest rates on loans.