# US WPI stocks rise 43%. What about WPC production?

> US manufacturers' whey protein isolate (WPI) stocks rose 42.7% year on year in September to about 9,100 metric tons. WPI production rose 8.9%, milk protein concentrate output surged 27.8%, and WPC production for human consumption fell 1.2%.

- Date: 2026-11-12 · published 2026-11-13T06:08:35.185Z
- Category: report · region US · magnitude low
- Page: https://feedsoft.ai/events/97189-us-wpi-stocks-rise-43-what-about-wpc-production
- Commodities: [Dry Whey](https://feedsoft.ai/c/WHEY.md)

## Why it matters

Rapid WPI inventory build alongside lower-protein WPC output points to a shifting mix in US milk protein supply, which can soften WPI pricing while tightening some concentrate grades used in feed and food.

## Read by commodity

- WHEY: bearish ▼

## Sources

- foodcom.pl: https://foodcom.pl/en/more-wpi-in-u-s-warehouses-inventories-rose-by-43/

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.