AccidentalHealthcareTechnologyHealthcareMisdeliveryEmployee Data InvolvedEmploymentIdentity (basic)Government IDMediumResolved

DEXCOM, INC.

bd_c65511a6a83cc373 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Jun 12, 2026

To disclose

—

Affected

24state residents only

Linked

4 filings

Confidence

66%

Full breach record for DEXCOM, INC. →4 incidents on file

Lockton, an insurance brokerage for Dexcom, Inc., inadvertently included employee personal information (SSNs, names, DOBs) in an Excel file sent to three RFP participants on April 29, 2026. Access was promptly revoked, and participants confirmed deletion or non-access. No misuse indicated. Affected employees received 2 years of Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Incident timeline

Apr 29, 2026

Begins

Jun 12, 2026

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

California State AGbd_1605ecaea23bf1532026-06-12Candidate
New Hampshire State AGbd_776fb90ed215b9e22026-06-12Verified
Nebraska State AGbd_b7744581e1d27ccc2026-06-12Verified

Name: the West Series of Lockton Companies, LLC
norm: the west series of lockton companies

Name: DEXCOM, INC.
norm: dexcom
Domain: dexcom.com
Industry: HealthcarellmTechnologyllm

Discovered: —
Breach occurred: Apr 29, 2026
Materiality determined: —
Notification sent: Jun 12, 2026
Affected individuals: 24state-resident count only
Data types: EmploymentIdentity (basic)Government ID
Data elements: Social Security numberDate of birth
Attack vector: Unknown
Third party: via RFP participants

During the incident: Revoked access to the Excel file from RFP participants
Confirmed deletion of the Excel file by RFP participants
Provided complimentary two-year membership in Experian IdentityWorks
Changes made: Review, audit, and strengthen controls and processes
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

California State AGJun 12 · first

New Hampshire State AGJun 12 · first

Nebraska State AGJun 12 · first

Massachusetts State AGJun 12 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-965-the-west-series-of-lockton-companies-llc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 12, 2026
Raw hash: 53c9ee9545266e09e758ce32963eb10a0b22ab7758bfa3f6c50dabe8c7493a28

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entitythe West Series of Lockton Companies, LLC

Victim entityDEXCOM, INC.

IncidentUnknown

Stated responseRevoked access to the Excel file from RFP participants

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov