AT&T INC.

public companyTelecomsUnited States of America

AT&T INC. is a telecoms organisation in United States of America. It appears on the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register, the Washington State Attorney General breach-notification register and an SEC 8-K filing with 3 confirmed incidents (4 filings); the most recent notice was filed on July 12, 2024.

Headquarters: Dallas, United States
Employees: 202,600 (as of 2021)
ISIN: US00206R1023
LEI: 549300Z40J86GGSTL398
Wikidata: Q35476

Data as of September 28, 2026.

Sources

Confirmed incident

US

Disclosed: July 12, 2024

Timeline

July 12, 2024
Acknowledged by organisation Self-reported
Form 8-K Item 1.05 filed 2024-07-12
^source
October 1, 2024
Press coverage Press
press report (press_reported): In October 2024, Kiberphant0m bragged on the cybercrime forums that he’d stolen the call and text metadata
^source
November 1, 2025
Press coverage Press
press report (press_reported): In late November 2025, KrebsOnSecurity warned that Kiberphant0m was likely a U.S. soldier stationed in South Korea
^source
December 1, 2025
Press coverage Press
press report (press_reported): Less than a month later, Wagenius was arrested and charged in two separate federal indictments
^source
August 1, 2026
Press coverage Press
press report (press_reported): Conor Riley Moucka , a.k.a. “Judische,” of Kitchener, Ontario was arrested in 2024 and pleaded guilty in August 2026
^source
September 28, 2026
Press coverage Press
press report (press_reported): Ex-US soldier gets 70 months for role in AT&T, Snowflake data thefts
^source
Undated
Press coverage Press
press report (press_reported): A former US soldier was sentenced to 70 months in prison for hacking into AT&T and Verizon systems and leaking the call detail records of a government official.
^source

Litigation

Possible litigation — multiple candidate dockets found, not yet resolved to a single case.

Confirmed incident

Filed in WA, MA and CA

The same incident was filed separately with 3 jurisdictions within a few days of each other (WA, MA and CA) — shown here as one incident.

Occurred: March 26, 2024
Disclosed: April 10, 2024

Timeline

April 9, 2024
Reported to regulator Regulator
CA AG breach notification: an unknown number of California residents affected
^source
April 10, 2024
Reported to regulator Regulator
MA AG breach notification: 161,272 Massachusetts residents affected
^source
April 10, 2024
Reported to regulator Regulator
WA AG breach notification: 378,471 Washington residents affected
^source

Litigation

Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
Possible litigation — multiple candidate dockets found, not yet resolved to a single case.

What a Washington notice means

Governed by RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.

Note: the count is Washington residents only, not a total.

Washington breach-notification register ↗

What a Massachusetts notice means

Governed by M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

What a California notice means

Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

October 21, 2025
Claimed by threat actor (unverified) Claim
Ransomware leak-site claim (ransomware_live)
^source

Sources

Timeline

Litigation

Timeline

Litigation

Timeline

Related

Same sector and location

Disclosed around the same time

Named on a leak site