A book-to-bill of 1.12 means that $112 worth of orders were received for every $100 of product billed for the month. The SEMI book-to-bill is a ratio of three-month moving averages of worldwide bookings and billings for North American-based semiconductor equipment manufacturers.

The three-month average of worldwide bookings in May 2006 was $1.65 billion. The bookings figure is three percent higher than the final April 2006 level of $1.60 billion and over 62 percent higher than the $1.02 billion in orders posted in May 2005.

The three-month average of worldwide billings in May 2006 was $1.48 billion. The billings figure is about three percent above the final April 2006 level of $1.44 billion and over 22 percent above the May 2005 billings level of $1.21 billion.

"Semiconductor fabrication facilities worldwide are utilizing high levels of available manufacturing capacity and equipment bookings have been steadily increasing," said Dan P. Tracy, senior director of Industry Research and Statistics at SEMI, in a statement. "Total bookings for North American-based equipment makers remained strong into the second quarter and are well above the same period last year."

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