North American-based manufacturers of semiconductor equipment posted $1.67 billion in orders in May 2007 (three-month average basis) and a book-to-bill ratio of 1.00 according to the May 2007 Book-to-Bill Report published today by SEMI. A book-to-bill of 1.00 means that $100 worth of orders were received for every $100 of product billed for the month. The three-month average of worldwide bookings in May 2007 was $1.67 billion. The bookings figure is about six percent greater than the final April 2007 level of $1.57 billion and about three percent greater than the $1.62 billion in orders posted in May 2006. The three-month average of worldwide billings in May 2007 was $1.67 billion. The billings figure is about five percent greater than the final April 2007 level of $1.59 billion and 15 percent greater than the May 2006 billings level of $1.45 billion. The data was compiled by David Powell, an independent financial services firm, without audit, from data submitted directly by the participants.