Buoyed by positive gains for shares of Amgen and Merck, the Dow Jones Industrial Average is climbing 413 points, or 0.94% on Tuesday.

Amgen's shares are up 4.8% while those of Merck are up 4.4%, combining for a roughly 89-point boost for the Dow.

Also contributing significantly to the gain are Sherwin-Williams Co., UnitedHealth, and Johnson & Johnson.

A $1 move in any of the Dow's 30 components results in a 6.15-point swing.