Medivation and Syngenta climb; Viacom, Marathon Oil fall

NEW YORK (AP) - Stocks that moved substantially or traded heavily on Monday:

Medivation Inc., up $13.26 to $80.42

The cancer drugmaker agreed to be bought by Pfizer for $13.5 billion, or $81.50 a share.

Marathon Oil Corp., down $1.16 to $15.64

The oil company said its chief financial officer is resigning and announced several other management changes.

Intersil Corp., up $3.10 to $18.74

The Wall Street Journal said Renesas of Japan is in talks to buy the chipmaker.

Syngenta AG, up $8.30 to $87.81

A U.S. national security panel approved the sale of the Swiss agrochemicals company to China National Chemical Corp.

Regeneron Pharmaceuticals Inc., up $14.35 to $418.65

Biotech drug companies stocks spiked after Medivation agreed to sell itself.

Viacom Inc., down $1.75 to $41.74

The media company's stock fell after it announced the long-expected exit of CEO Philippe Dauman.

Murphy Oil Corp., down 99 cents to $29.07

Energy company stocks dropped as oil prices posted steep losses, signaling an end to a recent rally.

Office Depot Inc., up 1 cent to $3.53

The office supply company said CEO Roland Smith will retire next year after it finds a replacement.