Park Dental Partners: Patient health data taken

The company is completing patient notifications and reports no known unauthorized use, resulting damages or material financial impact to date.

Rhea-AI Filing Summary

Park Dental Partners, Inc. reported that it identified unauthorized access to its computer network on August 28, 2026, and that its investigation determined data was subject to unauthorized acquisition. It identified patients whose protected health information was involved and is completing notifications under applicable state and federal law. The company initiated incident response protocols, engaged external cybersecurity experts and forensic specialists, and notified law enforcement.

The company disclosed four state court lawsuits related to the incident. Plaintiffs filed a motion on October 7, 2026, to consolidate the actions and appoint interim lead class counsel; the company also anticipates regulatory responses. To date, it is not aware of unauthorized use of protected health information or damages resulting from the incident, and has not identified a material impact on its financial condition or results of operations, including the current expected legal and advisor cost to address the incident. It will update its disclosure in a timely manner if additional information could affect its assessment.

8-K Event Classification

Item 1.05 — Material Cybersecurity Incidents

1 item

Item 1.05 Material Cybersecurity Incidents Business

A cybersecurity incident that the company has determined to be material to investors.

Key Figures

Unauthorized access identified: August 28, 2026 Related state court lawsuits: 4 lawsuits First lawsuit filed: September 3, 2026 +1 more

4 metrics

Unauthorized access identified August 28, 2026 Computer network incident

Related state court lawsuits 4 lawsuits Related to the August 2026 incident

First lawsuit filed September 3, 2026 One of the four state court actions

Consolidation motion filed October 7, 2026 Motion to consolidate the four actions and appoint interim lead class counsel

Key Terms

protected health information, incident response protocols, NIST Cybersecurity Framework

3 terms

protected health information medical

"patients whose protected health information was involved"

Protected health information is any personal medical or health-related data that can identify an individual—examples include diagnoses, treatment records, test results, insurance details, or an address when tied to health information. It matters to investors because organizations that collect, store or share this data face strict privacy laws, high breach and liability risk, and potential fines or reputational damage, making PHI a valuable but legally sensitive asset.

incident response protocols technical

"initiated its incident response protocols"

NIST Cybersecurity Framework technical

"NIST Cybersecurity Framework as a basis for security posture measurement"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What happened in Park Dental Partners (PARK)'s cybersecurity incident?

Park Dental Partners identified unauthorized access to its computer network on August 28, 2026, and determined data was subject to unauthorized acquisition. Protected health information of identified patients was involved, and the company is completing notifications under applicable state and federal law.

What is the status of the lawsuits related to Park Dental Partners (PARK)'s August 2026 incident?

Four state court lawsuits related to the August 2026 incident name Park Dental Partners as defendant and list plaintiffs Julienne Wyckoff; Thomas Jahnke and Nathaniel Sonia; Norbu Lama; and Becky Murphy and Debbie Palm. On October 7, 2026, plaintiffs filed a motion to consolidate the actions and appoint interim lead class counsel.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/13/2026 - 04:54 PM EDT Accepted by SEC EDGAR 10/13/2026 - 04:53 PM EDT Learn about SEC filing dates

0002069604false00020696042026-10-072026-10-07

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 7, 2026

Park Dental Partners, Inc.

(Exact name of registrant as specified in its charter)

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Minnesota	​ ​ ​	001-42967	​ ​ ​	93-2020683
(State or other jurisdiction of incorporation or organization)	​	(Commission File Number)	​	(I.R.S. Employer Identification Number)

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2200 County Road C West, Suite 2210

Roseville, Minnesota 55113

(Address of Principal Executive Offices) (Zip Code)

(651) 633-0500

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

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☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Securities registered pursuant to Section 12(b) of the Act:

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Title of each class	​ ​ ​	Trading Symbol	​ ​ ​	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	​	PARK	​	The Nasdaq Capital Market

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☒

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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 lawsuits also allege that the Company failed to timely notify affected individuals. Claims include negligence, negligence per se, invasion of privacy, breach of fiduciary duty, unjust enrichment, breach of implied contract, and breach of confidence. The Company intends to vigorously defend its positions in the litigation. On October 7, 2026, the plaintiffs filed a motion to consolidate the four actions and appoint interim lead class counsel. The Company also anticipates regulatory responses. To date, the Company is not aware of any unauthorized use of protected health information or any damages as a result of the incident.

Security is a top priority for Park Dental Partners, Inc. and the Company continues to focus on protecting the privacy of protected health information in its care and mitigating cybersecurity risk, maintaining safeguards designed to protect data, continuously reviewing and enhancing those protections to address evolving threats, and providing ongoing and regular cybersecurity awareness training and testing for all employees. The Company maintains a cybersecurity risk-management program designed to assess, identify, and manage material risks arising from cybersecurity threats, consistent with the standards reported by peer companies in the dental and medical industries, which commonly leverage the National Institute of Standards and Technology (“NIST”) Cybersecurity Framework as a basis for security posture measurement and risk management.

To date, the Company has not identified any material impact on its financial condition or results of operations as a result of this incident, including the current expected legal and advisor cost to address the incident.

To the extent additional information becomes available that could affect the Company’s assessment of the incident and its impact, the Company will update this disclosure in a timely manner.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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Date: October 13, 2026	​	PARK DENTAL PARTNERS, INC.
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​	By:	/s/ Christopher J. Bernander
​	Name:	Christopher J. Bernander
​	Title:	Chief Financial Officer

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Filing Exhibits & Attachments

4 documents

Other Documents

• EX-101 EX-101.SCH 3.8 KB
• EX-101 EX-101.DEF 2.8 KB
• EX-101 EX-101.LAB 16.8 KB
• EX-101 EX-101.PRE 11.6 KB