Rudolph Technologies

(RTEC) - Get Report

is offering 1 million common shares to the public, and stockholders are selling another 2.5 million shares, for $45 each.

The maker of parts and systems for semiconductor manufacturing said the offering includes an option for the underwriters to buy up to 525,000 shares to cover over allotments.

The shares will be offered through underwriters led by

Robertson Stephens

,

CIBC World Markets

,

Bear Stearns

,

Prudential Volpe Technology Group

and

Wit SoundView

.

Shares of Rudolph fell $1.44, or 3.2%, to $43.69 in recent

Nasdaq

trading.