SAN JOSE — North America-based semiconductor equipment manufacturers posted worldwide 90-day average orders of $1.57 billion in April, up 9% over  a year ago. 

Bookings were up 12.9% from than the final March 2015 level, the SEMI trage group reported.

The three-month average worldwide billings was $1.51 billion, up 19.3% over the revised March level and 7.6% than April 2014.

The book-to-bill ratio was 1.04, extending a growth streak to four months. A ratio of 1.04 means that $104 worth of orders were received for every $100 of product billed for the month, and a ratio above 1.0 is considering a sign of future growth.

Source: SEMI (www.semi.org), May 2015 

The data contained in this release were compiled by David Powell, Inc., an independent financial services firm, without audit, from data submitted directly by the participants. SEMI and David Powell, Inc. assume no responsibility for the accuracy of the underlying data.

The data are contained in a monthly Book-to-Bill Report published by SEMI. The report tracks billings and bookings worldwide of North American-headquartered manufacturers of equipment used to manufacture semiconductor devices, not billings and bookings of the chips themselves. The Book-to-Bill report is one of three reports included with the SEMI Equipment Market Data Subscription (EMDS).

SEMI is the global industry association serving the nano- and 

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