By Caitlin Ostroff

Two widely followed European benchmark stock indexes failed to show prices for about an hour after markets opened Monday due to issues with index calculation, according to the operator.

The Stoxx Europe 600 and the Euro Stoxx 50 failed to show changes in their levels at open due to "input data problems," according to Andreas von Brevern, a spokesman for index operator Deutsche Boerse AG.

Mr. Von Brevern declined to elaborate on what caused the issues but said the operator was working to resolve them.

Trading in underlying shares for the indexes, listed in countries including the U.K., France and Germany, continued to trade during the outage. The stock indexes resumed trading about an hour after the market opened.

"The data dissemination problems have been resolved. The indices are being calculated in the right way," Mr. Von Brevern said.

Write to Caitlin Ostroff at caitlin.ostroff@wsj.com

(END) Dow Jones Newswires

11-02-20 0448ET