Global input demand growth hit a four-month high in September, according to GEP's Global Supply Chain Volatility Index — a weighted survey of roughly 27,000 firms across 40 countries, produced jointly by S&P Global and GEP. The reading climbed as purchasing activity surged in Asia, North America and parts of Europe.

That rebound landed alongside rising input shortages and the first uptick in global freight costs since April. Buyers now face firmer orders at the exact moment suppliers are beginning to stretch.

What does the index measure?

The composite is a weighted aggregate of six sub-indices built from Purchasing Managers' Index (PMI) data, PMI comment-trackers and commodity-price and supply indicators compiled by S&P Global. A reading above 1.0 signals tightening conditions; below 1.0, looser ones.

"Global input demand growth rose to its strongest since May and was close to its 2026 high, signaling firmer manufacturing activity heading into the fourth quarter," the report's authors wrote.

Where did regional readings move?

September split cleanly between east and west:

• Asia: 1.49, up from 1.24 in August — a three-month peak
• North America: 1.13, up from 0.87 — the highest since June
• Europe: 0.66, down from 1.27 — the lowest reading since March
• United Kingdom: 0.59, down from 1.10 — manufacturers pared back stockpiling

The strongest purchasing accelerations came from the U.S., Germany, Taiwan and South Korea. Demand growth in those markets ran close to the 2026 high, the authors said.

What's driving the tightness?

Three pressures converged. Input shortages rose for the first time since May, with petroleum-based products leading the squeeze. Labor shortfalls pushed up order backlogs across production lines. Global freight costs climbed for the first time since April as oil prices lifted average logistics bills.

"Shortages of oil and oil-based products were particularly acute, creating renewed cost and availability pressures for manufacturers," the report noted.

The inventory picture carries its own warning. Safety-stock build rates fell for a third straight month after peaking in June, the authors said, though absolute buffer levels remain historically elevated. Translation for procurement: the cushion against an oil-led price spike is thinner than the headline inventory numbers suggest.

What does this mean for sourcing teams?

John Piatek, vice president at GEP Consulting, framed the shift plainly.

"Manufacturers are buying more because demand is strengthening, but they're doing so at a time when shortages and transportation costs are starting to rise again," Piatek said. "For companies, that means the priority shifts from simply protecting inventory to securing supply and controlling costs. If demand continues to build through the fourth quarter, businesses that wait will face tighter availability and higher input costs."

The practical sourcing response: lock freight contracts before the next oil-led cost bump, secure forward cover on petroleum-derived inputs, and re-qualify alternate supplier bases for any commodity flagged tight in the September print.

The bottom line for sourcing managers: the procurement window ahead of peak Q4 demand is closing, and the next move has to be contractual, not operational.