Some grocery stores in Boulder have seen shortages of eggs and other product after a cyberattack hit a major organic grocery supplier.

United Natural Foods Inc. is one of the nation’s leading organic food distributors and a supplier to Whole Foods and other grocery stores. United Natural Foods became aware of unauthorized activity on its Information Technology systems June 5, according to a report filed with the U.S. Securities and Exchange Commission. The cyberattack prompted United Natural Foods to take some of its systems offline, which impacted the company’s ability to fulfill and distribute its orders.

Whole Foods is working on restocking shelves as quickly as possible and apologized for any inconvenience to customers, a spokesperson wrote in an email to the Daily Camera on Tuesday. The spokesperson added that United Natural Foods is now accepting orders and delivering products.

Eggs are one item where Boulder stores were seeing shortages as of Tuesday. Whole Foods on Broadway did not have eggs in stock, for example, and at Natural Grocers in Boulder, eggs were beginning to return to the shelves. The Whole Foods spokesperson did not answer questions about how the distribution issue was affecting its Boulder stores.

Christin Evans, the assistant store director at Lucky’s Market in Boulder, said Lucky’s started feeling the effects of the distribution issue beginning June 7.

“Small independent grocers like ourselves, as well as big guys like (Natural Grocers), Sprouts and Whole Foods, we’re all pulling from the same national distributor, and they’re having an issue,” Evans said.

Evans said that because Lucky’s Market is an independent grocer, they’ve been able to work with local Colorado vendors to fill the gap. They’ve been able to fill their shelves with locally sourced natural and organic eggs, for example.

“We’re all starting to receive orders again — we just have to do it in a different way than we normally do,” Evans said.

United Natural Foods wrote in a statement Sunday that the company is receiving orders and delivering products to its grocery store customers.

“Over the past few days, we’ve made significant progress toward safely restoring our electronic ordering systems, which will allow us to serve the customers that order through these systems in a more automated way and continue to increase our operational capacity,” the statement read. “We are also using alternative processes to ensure our customers receive the products they need while we continue making progress to restore our technology capabilities.”

Evans added it’s more than just eggs that were affected. United Natural Foods lists produce, floral, bakery, deli, meat and seafood, frozen foods, and dairy, in addition to health and beauty and wellness, among its product types.

“Shelves are just running sparse across the country,” Evans said.

United Natural Foods has a distribution center in Aurora, according to its website. The company delivers products to more than 30,000 locations in North America, according to the website.