After Pentagon Feud, UK Woos Anthropic to London

"No amount of intimidation or punishment from the Department of War will change our position on mass domestic surveillance or fully autonomous weapons." - Anthropic, official statement, February 2026

Britain doesn't want Anthropic to become a casualty of Washington's political fight with Silicon Valley. Six weeks after President Trump ordered federal agencies to "immediately cease" using Claude and Secretary of War Pete Hegseth branded Anthropic a supply-chain risk, the UK government is assembling a package designed to pull the company deeper into London.

The offer is set to be formally presented to Anthropic CEO Dario Amodei during a planned European visit in late May. The timing is deliberate: UK officials want to reach Amodei before the Pentagon's appeal can restore the blacklist and before Anthropic locks in its IPO banking relationships.

What the Pentagon Did - and What It Cost

The sequence of events began February 27, when Trump posted on Truth Social directing all federal agencies to "IMMEDIATELY CEASE all use of Anthropic's technology." Hegseth followed hours later with a formal supply-chain risk designation under 41 U.S.C. § 4713 - a statute historically applied to foreign adversaries such as Huawei and ZTE. No American company had been publicly designated under it before.

The trigger was a collapsed Pentagon contract. Anthropic had been awarded a frontier AI contract in January 2026. Talks broke down when the Department of War demanded "any lawful use" language, covering fully autonomous weapons and mass domestic surveillance of Americans. Anthropic refused both. Amodei was direct about why: "We believe that crossing those lines is contrary to American values."

The practical consequences landed fast. Defense contractors who used Claude in Pentagon work were required to certify they had dropped it. An internal Pentagon memo ordered removal of Anthropic's technology from key systems. The company's CFO later stated the designation could cut Anthropic's 2026 revenue by multiple billions of dollars.

Dario Amodei, Anthropic CEO, is scheduled to visit Britain in late May 2026 for a European customer and policy tour. Source: wikimedia.org

At the same time, Anthropic filed two federal lawsuits on March 9: one in the Northern District of California, one in the D.C. Circuit. Both claim First Amendment retaliation and argue the Pentagon exceeded the statute's scope. On March 26, Judge Rita F. Lin granted a preliminary injunction blocking 17 federal agencies from adding the designation. Her assessment was direct: "The record strongly suggests that the reasons given for designating Anthropic a supply chain risk were pretextual and that the government's real motive was unlawful retaliation." Judge Lin found the company "likely to succeed" on its First Amendment claims. The Department of War filed its Ninth Circuit appeal on April 2.

The UK Offer

Britain's pitch isn't charity. Anthropic already employs roughly 200 people in London, including about 60 researchers. Former UK Prime Minister Rishi Sunak joined as a senior adviser to Anthropic in 2025, giving the relationship political texture well beyond standard foreign direct investment negotiations.

Britain's pitch to Anthropic is backed by No. 10 Downing Street, London Mayor Sadiq Khan, and Business Secretary Peter Kyle, who leads the Global Talent Taskforce behind the project. Source: wikimedia.org

The package under discussion, drafted by Department for Science, Innovation and Technology staff, includes expansion of Anthropic's existing London headquarters, a £40 million state-backed research lab, and a dual listing on the London Stock Exchange with the US IPO. The dual listing would give Anthropic access to European institutional investors at a moment when its US regulatory standing faces an active legal challenge.

Business Secretary Peter Kyle has been careful not to oversell the stock exchange angle. He described Anthropic as "one of many fast-growing companies" he wanted investing more in the UK, and stressed talent and research over listing optics. An unnamed government insider called a dual listing "the dream" while conceding it's "a highly unlikely outcome."

Sadiq Khan's pitch is more direct. The mayor personally invited Anthropic to expand in London, calling the UK "a stable, proportionate and pro-innovation environment" - an implicit contrast with the current US posture.

Impact Assessment

Who Benefits from Anthropic's Exclusion

OpenAI is the obvious short-term beneficiary. With Claude removed from defense contractors' toolkits, OpenAI - which has no public red lines on autonomous weapons - picks up direct procurement opportunities. Palantir and Anduril, which have leaned aggressively into military AI, face no comparable constraints. Shield AI, which recently closed a $1.5 billion Series G and is building autonomous piloting systems for the US Air Force, operates in a market where Anthropic's absence creates more room.

What the Injunction Actually Blocked

Judge Lin's March 26 order halted 17 federal agencies from enforcing the designation, but it didn't touch the designation itself. Pentagon CTO Emil Michael posted on X the same day that the ruling contains "dozens of factual errors" and that the designation is "in full force and effect" regardless of any California court order. That legal contradiction - a federal injunction in place, a government official declaring it void - remains unresolved and will likely define the Ninth Circuit's first significant question.

The IPO Stakes

The London Stock Exchange at Paternoster Square. A dual listing alongside Anthropic's planned October 2026 Nasdaq IPO is part of Britain's offer. Source: wikimedia.org

Anthropic's financials make the UK hedge worth examining seriously. The company is targeting an October 2026 Nasdaq IPO with Goldman Sachs, JPMorgan Chase, and Morgan Stanley. The target raise is over $60 billion. Annualised revenue has surpassed $30 billion, exceeding OpenAI's $25 billion figure. The current valuation stands at $380 billion, set by a funding round closed in February 2026.

A supply-chain risk designation that survives Ninth Circuit review - even partially - injects real uncertainty into that IPO timeline and investor narrative. A dual London listing gives Anthropic access to European institutional capital and a credible claim that the company can operate outside US political reach. Both are useful on an IPO roadshow regardless of whether the appeal ultimately succeeds.

What Happens Next

Amodei's late-May European visit is the next concrete milestone. DSIT officials drafted the formal proposals specifically for that meeting. If the Ninth Circuit moves quickly and restores the designation before Amodei arrives, the pressure on Anthropic to diversify its institutional relationships grows.

The original Trump ban on Anthropic federal use was aggressive exactly because it was unprecedented - no domestic AI company had faced a statutory supply-chain designation before. The UK government is reading that aggression as an opportunity. Whether Amodei sees a London expansion as a hedge or a retreat will shape how far the deal goes. What's already clear is that London is making its pitch before the Ninth Circuit makes its ruling.

Sources: Financial Times via Reuters/USNews, City AM, Benzinga, Artificial Intelligence News, Winbuzzer, Breaking Defense - injunction and Pentagon CTO response, YourNews - Pentagon Ninth Circuit appeal, Anthropic official statement on Department of War