Park Dental Partners, Inc.

Item 1.05 Material Cybersecurity Incidents. As previously reported, on August 28, 2026 , Park Dental Partners, Inc. (“Company”) identified unauthorized access to its computer network. The Company promptly initiated its incident response protocols, engaged external cybersecurity experts and forensic specialists and notified law enforcement. The investigation has determined that data was subject to unauthorized acquisition as a result of the incident. The Company has identified impacted patients whose protected health information was involved and is completing notifications pursuant to applicable state and federal law. The Company is aware of four state court lawsuits related to the August 2026 data breach, the first of which was filed on September 3, 2026: Julienne Wyckoff, on behalf of himself and all others similarly situated v. Park Dental Partners, Inc. (62-CV-26-6341), Second Judicial District, County of Ramsey, State of Minnesota; Thomas Jahnke and Nathaniel Sonia, on behalf of themselves and all others similarly situated v. Park Dental Partners, Inc. (62-CV-26-6381), Second Judicial District, County of Ramsey, State of Minnesota; Norbu Lama, on behalf of himself and all others similarly situated v. Park Dental Partners, Inc. (62-CV-26-6384), Second Judicial District, County of Ramsey, State of Minnesota; and Becky Murphy and Debbie Palm, on behalf of themselves and all others similarly situated v. Park Dental Partners, Inc. (62-CV-26-7111), Second Judicial District, County of Ramsey, State of Minnesota. Each lawsuit is a putative class action alleging the Company failed to safeguard patients’ protected health information or failed to implement reasonable security measures that resulted in the August 2026 data breach and increased the risk of identity theft. The la