NEW YORK — A single software release from AI startup Anthropic PBC sent shockwaves through global markets on Tuesday, sparking a massive $285 billion selloff that decimated software, financial services, and asset management stocks.
The rout began after Anthropic unveiled a new suite of automation capabilities for its Claude Cowork agent. Specifically, the launch of a “legal productivity tool” designed to automate complex tasks—such as contract reviews, compliance checks, and legal briefings—ignited fears that general-purpose AI is now capable of “disintermediating” high-margin professional services and legacy software providers.
Market Carnage by the Numbers
The reaction on Wall Street was swift and severe, with investors racing to dump shares of any company perceived as vulnerable to AI-driven disruption.
- Software Sector: A Goldman Sachs basket of US software stocks plunged 6%, marking its worst single-day performance since the tariff-related volatility of April.
- Financial Services: An index of financial firms tumbled nearly 7%.
- Nasdaq 100: The tech-heavy index fell as much as 2.4% intraday before closing down 1.6%.
- SaaS Apocalypse: The iShares Expanded Tech-Software Sector ETF (IGV) hit new lows, extending its January plunge to a cumulative 15%—its worst monthly performance since the 2008 financial crisis.
Worst Performing Stocks (Feb 3, 2026)
| Company | Sector | One-Day Decline |
| Thomson Reuters (TRI) | Legal/Data Services | -18% |
| LegalZoom (LZ) | Legal Services | -19.2% |
| Gartner (IT) | Tech Consulting | -21% |
| RELX PLC | Professional Analytics | -14% |
| Wolters Kluwer | Legal Software | -13% |
| Accenture (ACN) | IT Consulting | -7.5% |
The “Cowork” Catalyst: Why Now?
While AI anxiety has been brewing for months, the specific nature of Anthropic’s update changed the narrative from “AI as a tool” to “AI as a replacement.”
The new Claude Cowork plugins allow enterprises to automate workflows that were previously the bread and butter of companies like Thomson Reuters and Experian. By providing a “semantic layer” that can handle contract triage and NDA reviews without needing expensive third-party software subscriptions, Anthropic has challenged the “visibility premium” long enjoyed by established data firms.
“This is the defining year,” said Stephen Yiu, CIO of Blue Whale Growth Fund. “The market is now ruthlessly separating AI winners from victims. Until the dust settles, it’s a dangerous path to be standing in the way of frontier AI.”
Broader Economic Fallout
The panic was not confined to software. High-profile asset management and private equity firms were also targeted due to their heavy exposure to software-heavy portfolios.
- Alternative Investment Giants: Shares of Ares Management, KKR & Co., and TPG Inc. all slid by more than 10% during the session.
- Asset Management: Blackstone and Apollo Global Management saw drops of up to 8%.
The selloff even crossed the Atlantic and the Indian Ocean. In London, the FTSE 100 erased record morning gains to end in the red, while India’s Nifty IT index plummeted nearly 6% in following-day trade as concerns over the traditional IT outsourcing model reached a fever pitch.
A Glimmer of Divergence
Despite the “SaaSpocalypse” (a term coined by Jefferies traders to describe the “sell at any cost” mentality), not every AI-linked name suffered. Palantir Technologies stood as a notable outlier, surging 7% after delivering a “blockbuster” earnings report that demonstrated clear, high-margin AI monetization—a proof of concept that many of its peers currently lack.
As the market enters a new phase of “AI Realism,” investors are no longer pricing in potential; they are demanding immediate evidence that companies can defend their moats against the rapid advancement of agentic models like Claude.