FISERV, INC.

Fiserv is a leading American financial technology company headquartered in Milwaukee, Wisconsin. It provides payment processing, banking software, and financial services technology to banks, credit unions, merchants, and other financial institutions worldwide. Its services include core banking systems, digital payments, card processing, and data analytics. Fiserv operates globally and is listed on the NASDAQ stock exchange.

Data exfiltrated included the following: Projects, Cad-files, files Windchil, Soft Total size: 874Gb Revenue: $21,200,000,000

Fiserv is a global financial technology company headquartered in Milwaukee, Wisconsin, United States. It provides financial services technology solutions including payment processing, core banking systems, digital banking platforms, and merchant acquiring services. Serving banks, credit unions, retailers, and businesses worldwide, Fiserv operates across the fintech and banking technology industry and is one of the largest providers of financial services infrastructure globally.

FISERV filed a data-breach notice with the Illinois Attorney General in January 2026 (case 26-01-701). The register records the breach as discovered on November 13, 2025. Personal information types reported: medical information. Illinois does not publish the number of people affected — 815 ILCS 530/10 permits the Attorney General to publish only the entity name, the types of personal information and the date range.

FISERV filed a data-breach notice with the Illinois Attorney General in January 2026 (case 26-01-728). The register records the breach as discovered on September 24, 2025. Personal information types reported: medical information. Illinois does not publish the number of people affected — 815 ILCS 530/10 permits the Attorney General to publish only the entity name, the types of personal information and the date range.

Fiserv reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-12-06. 19 Massachusetts residents were affected. The report records the breach type as electronic.

FISERV filed a data-breach notice with the Illinois Attorney General during 2023 (case 23-324). The register records the breach as discovered on December 11, 2022. Illinois does not publish the number of people affected — 815 ILCS 530/10 permits the Attorney General to publish only the entity name, the types of personal information and the date range.

FISERV filed a data-breach notice with the Illinois Attorney General during 2023 (case 23-154). The register records the breach as discovered on December 11, 2022. Illinois does not publish the number of people affected — 815 ILCS 530/10 permits the Attorney General to publish only the entity name, the types of personal information and the date range.

Fiserv reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2021-09-25. 12 Massachusetts residents were affected. The report records the breach type as electronic.

Fiserv (via CheckFree business unit) notified New Hampshire AG regarding a Dec 2, 2008 incident where online bill payment traffic was redirected to a malicious site in Ukraine. Approximately 160,000 consumers were potentially exposed to malware attempting to steal credentials. Fiserv provided McAfee remediation and credit monitoring, and notified federal regulators including the FBI and FTC.