Case Study: Telefónica achieves faster, consistent SEC and ESEF reporting with Workiva

Telefónica Transformed Its Reporting Cycle with Workiva

Telefónica, one of the world’s largest telecommunications companies listed on multiple exchanges, faced growing complexity from new regulatory filing requirements—most notably the SEC’s XBRL mandate and Europe’s ESEF—on top of existing multi-jurisdiction reporting. Their legacy tool limited collaboration and introduced risk, so the reporting team sought a cloud solution that would both meet filing requirements and improve the overall reporting process.

Telefónica adopted the Workiva platform, which proved quick to implement and easy to use; after brief training the team filed with the SEC earlier than previous years. By creating a single source of truth with more than 160,000 linked instances, Workiva automated updates and formatting across SEC and ESEF reports, enabled real-time collaboration for large teams, eliminated bottlenecks, reduced duplicate effort and increased confidence in last‑minute changes.

Telefónica

Kiko González Barrajón

Head of Consolidated Reporting