Vendor

Thomson Reuters

Legal name: Thomson Reuters Corporation
Headquarters: Canada
Website: thomsonreuters.com
Stories: 8

ResearchDraftingLlm platformPractice management

Product names are carried as aliases because outlets report the product, not the parent. `founded` is deliberately unset: the corporation dates from the 2008 Thomson/Reuters merger but the legal business is older, and neither date is the obvious one. Confirm before setting it.

U.S. FEDCourt order

Fourth Circuit strikes down West Virginia Daniel's Law in suits against Thomson Reuters, LexisNexis

The Fourth Circuit affirmed a ruling that West Virginia's Daniel's Law, which restricts publishing the home addresses and phone numbers of judicial and law enforcement officials, violates the First and Fourteenth Amendments. A former state law enforcement officer had sued Thomson Reuters America, LexisNexis Risk Solutions and other people-search providers under the law. The court said the statute's lack of a notice requirement, which similar laws include, was fatal.

Order (Bloomberg Law) → · National Law Journal, Law360Oct. 28

U.S. FEDProduct launches

Microsoft launches Copilot for Legal with more than 20 legal skills in Word and Cowork

Microsoft launched Copilot for Legal on October 15, 2026, adding more than 20 legal-specific skills to Microsoft Copilot for contract review, drafting, obligations tracking and case chronologies in Word and its agentic Cowork workspace. Plugins from more than two dozen legal technology partners, including Harvey, Legora, iManage and Relativity, begin rolling out through Microsoft's plugin registry.

Announcement (Artificial Lawyer) → · The Lawyer, LawSitesOct. 15

U.S. FEDProduct launches

Thomson Reuters adds Multinational Profile to CoCounsel Legal for cross-border research

Thomson Reuters introduced a Multinational Profile for CoCounsel Legal that pulls legal and regulatory content from more than 100 countries and territories into one research workflow, LegalTech.ca reported October 14, 2026. The company said users can compare requirements across markets, flag issues needing local counsel and inspect underlying sources. Broader next-generation CoCounsel Legal availability is planned across more markets through late October 2026.

Announcement (LegalTech.ca) → · TechNode GlobalOct. 16

IDAHOResearch

arXiv: Thomson Reuters engineers find agent harness design matters more than model size for legislative XML

Paper (arXiv) →Oct. 15

3D CIR.Litigation

ROSS says it will ask Supreme Court to review Third Circuit Westlaw copyright loss

Filing (LawSites) →Oct. 3

N.D. CAL.Litigation

Proposed class sues Thomson Reuters over Casetext 'killer acquisition' into Westlaw

Bloomberg Law and the ABA Journal reported on October 2, 2026, that Carlsbad's Rubin Law Office filed a putative antitrust class action in the Northern District of California accusing Thomson Reuters of buying Casetext for $650 million and folding it into Westlaw to eliminate a lower-priced competitor. The complaint seeks class certification, treble damages, and an order to divest or restore Casetext; Thomson Reuters said it had not been served and declined comment until review.

Filing (Bloomberg Law) → · ABA Journal, Law360Oct. 3

3D CIR.Court order

Third Circuit affirms Thomson Reuters win over ROSS on Westlaw headnotes and AI training

The U.S. Court of Appeals for the Third Circuit on September 29, 2026, affirmed a Delaware federal judgment that ROSS Intelligence infringed Thomson Reuters Westlaw headnotes and could not claim fair use for using them to train a competing AI legal research tool, Bloomberg Law and Copyright Lately reported. The precedential opinion, filed under temporary seal on September 29, is now public on the court's website.

Order (Bloomberg Law) → · Copyright Lately, LawSites, U.S. Court of Appeals for the Third Circuit +1Sept. 30

S.C.Breaches and incidents

Thomson Reuters C-Track breach exposes court files across U.S. and Canadian systems

West Publishing's C-Track notified the public on September 2, 2026 that an unauthorized party obtained court-management files after activity discovered on June 30, 2026, with files obtained in March. The notice lists appellate and other courts in multiple U.S. states, the U.S. Virgin Islands and three Ontario courts. Confidential, redacted or sealed information may have been impacted at some courts; South Carolina's preliminary review found no PII so far in 2020-and-earlier appellate backups.

Report (C-Track) → · Supreme Court of South Carolina, The Record, Help Net SecuritySept. 5