AccidentalHealthcareTechnologyHealthcareMisdeliveryEmployee Data InvolvedIdentity (basic)Government IDEmploymentMediumResolved

DEXCOM, INC.

bd_776fb90ed215b9e2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 29, 2026

Filed

Jun 12, 2026

To disclose

6 weeks

Affected

4state residents only

Linked

4 filings

Confidence

66%

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

The West Series of Lockton Companies, LLC (Lockton), a vendor for Dexcom, Inc., inadvertently disclosed personal information of Dexcom employees to three RFP participants on April 29, 2026. An Excel file sent to inform proposals contained names, dates of birth, Social Security numbers, and potentially benefits election information. Access was promptly revoked. One participant opened and deleted the file; two others confirmed they did not open it. Four New Hampshire residents were affected. Lockton is providing two years of credit monitoring.

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Incident timeline

discovery → filing · 6 weeks / 44 days

Apr 29, 2026

Begins

Apr 29, 2026

Discovered

Jun 12, 2026

Filed

vs. sector median

6 wks faster

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
Nebraska State AGbd_b7744581e1d27ccc2026-06-12Verified
Massachusetts State AGbd_c65511a6a83cc3732026-06-12Verified

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: Apr 29, 2026
Breach occurred: Apr 29, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 12, 2026
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDEmployment
Data elements: Social Security numberDate of birth
Attack vector: Unknown
Regulator citations: Notified New Hampshire Attorney General
Third party: via The West Series of Lockton Companies, LLC

During the incident: Revoked RFP participants' access to the file promptly
Obtained affidavits from two RFP participants confirming they had not opened the file
Confirmed deletion of the Excel file by the one participant who opened it
Took additional steps to further safeguard all Dexcom data
Began mailing notification letters to affected individuals
Changes made: Reviewing, auditing, and strengthening controls and processes
Providing affected individuals with a complimentary, two-year membership in Experian IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(44 days from discovery to filing)
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

Nebraska State AGJun 12 · first

Massachusetts State AGJun 12 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/west-series-lockton-20260612.pdf
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: 6db4b31223262ef1c057cc283a0ab24644ab7b4cfe8ec1cb79be40f64d43ecbb

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entitythe West Series of Lockton Companies, LLC

Victim entityDEXCOM, INC.

Incidentdiscovered Apr 29, 2026

Stated responseRevoked RFP participants' access to the file promptly

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov