Strong results: KB Home climbed 9 percent, to $16.37 Friday after the homebuilder's latest quarterly earnings beat Wall Street's expectations. Earnings got a boost from higher home prices.

Healthy bounce: The shares of Cigna shot up 16 percent Monday to $153.43 after the Wall Street Journal reported that the Blue Cross-Blue Shield carrier Anthem tried to buy the insurer. Anthem shares rose 2 percent, to $164.46. Cigna shares closed the week at $155.26; Anthem closed Friday at $165.06.

Wooing Aetna: Shares in Aetna rose 3.4 percent to $125.15 Tuesday after the Wall Street Journal reported that UnitedHealth Group approached the rival health insurer about a deal. Aetna closed the week at $124.07. UnitedHealth gained 2.2 percent Tuesday, to $121.64, closing the week at $120.33.

Winning bid: Coty surged 19 percent ­Tuesday, to $30.93 on reports that the cosmetics and fragrance company had won an auction to buy several Procter & Gamble businesses. Coty closed Friday at $31.66.

Ugly outlook: Oshkosh shares slumped 8 percent Tuesday, to $46.47 after the vehicle maker cut its profit forecast, citing bad weather and delayed product launches. Oshkosh closed the week at $45.70.

Face-lift: Shares in Kythera Biopharmaceuticals surged 22 percent, to $74.06 Wednesday on news it will be acquired by Botox maker Allergan for about $2.1 billion. Kythera finished the week at $75.

Track this: Fitbit shares surged 50 percent Thursday, to $30.08 in the first day of trading for the fitness tracking gear maker. The stock ended the week at $32.50.