SEMI reports that the three-month average of worldwide bookings in September 2015 was $1.60 billion. The bookings figure is 4.1 percent lower than the final August 2015 level of $1.67 billion, and is 35.1 percent higher than the September 2014 order level of $1.19 billion.

The three-month average of worldwide billings in September 2015 was $1.50 billion. The billings figure is 4.6 percent lower than the final August 2015 level of $1.58 billion, and is 19.7 percent higher than the September 2014 billings level of $1.26 billion.

“Both bookings and billings trended slightly lower in the September three-month average compared to August,” said Denny McGuirk, president and CEO of SEMI. “While year-to-date billings through the first three quarters are above 2014 billings, uncertainty with semiconductor demand has dampened expectations with capex plans in the near-term.”

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. Billings and bookings figures are in millions of U.S. dollars.