Jun 28, 2021 
IPC announced today the May 2021 findings from its North American Electronics Manufacturing Services (EMS) Statistical Program.The book-to-bill ratio stands at 1.55.
Total North American EMS shipments in May 2021 were up 1.9 percent compared to the same month last year. Compared to the preceding month, May shipments fell 3.9 percent.
EMS bookings in May rose 10.5 percent year-over-year and but decreased 19.2 percent from the previous month.
“The electronics manufacturing supply chain remains constrained. While we did see a stepdown in bookings in May, shipments have not been able to keep up with elevated order flow in recent months,” said Shawn DuBravac, IPC’s chief economist. “Shipments are likely 40 to 50 percent below where they should be given current order volume. I expect shipments will continue to lag bookings given ongoing supply constraints including higher prices and longer lead-times.”
Detailed Data Available
Companies that participate in IPC’s North American EMS Statistical Program have access to detailed findings on EMS sales growth by type of production and company size tier, order growth and backlogs by company size tier, vertical market growth, the EMS book-to-bill ratio, 3-month and 12-month sales outlooks, and other timely data.
Interpreting the Data
The book-to-bill ratios are calculated by dividing the value of orders booked over the past three months by the value of sales billed during the same period from companies in IPC’s survey sample. A ratio of more than 1.00 suggests that current demand is ahead of supply, which is a positive indicator for sales growth over the next three to twelve months.A ratio of less than 1.00 indicates the reverse.
Year-on-year and year-to-date growth rates provide the most meaningful view of industry growth. Month-to-month comparisons should be made with caution as they reflect seasonal effects and short-term volatility. Because bookings tend to be more volatile than shipments, changes in the book-to-bill ratios from month to month mightnot be significant unless a trend of more than three consecutive months is apparent. It is also important to consider changes in both bookings and shipments to understand what is driving changes in the book-to-bill ratio.
IPC’s monthly EMS industry statistics are based on data provided by a representative sample of assembly equipment manufacturers selling in the USA and Canada. IPC publishes the EMSbook-to-bill ratio bythe end of each month.
IPC (www.IPC.org) is a global industry association based in Bannockburn, Ill., dedicated to the competitive excellence and financial success of its nearly 3,000-member company sites which represent all facets of the electronics industry, including design, printed board manufacturing, electronics assembly and test. As a member-driven organization and leading source for industry standards, training, market research and public policy advocacy, IPC supports programs to meet the needs of an estimated $2 trillion global electronics industry. IPC maintains additional offices in Washington, D.C.; Atlanta, Ga.; Miami, Fla.; Brussels, Belgium; Bangalore and New Delhi, India; Bangkok, Thailand; and Qingdao, Shanghai, Shenzhen, Chengdu, Suzhou and Beijing, China.
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