IBM shares collapsed 13.2% on February 23, 2026 — their steepest single-day drop in over 25 years — after Anthropic unveiled a Claude Code capability that directly threatens the tech giant's multibillion-dollar COBOL modernization business. The sell-off erased more than $31 billion in market value within a single session, and has placed IBM on track for its worst monthly performance since 1968.
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<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">The Trigger: Anthropic's COBOL Modernization Bombshell</h2>
IBM shares closed at $223.35, down 13.2% from the prior session, after Anthropic published a blog post on February 23 asserting that its Claude Code AI tool can automate the most labor-intensive phases of COBOL legacy system modernization — a capability long considered the exclusive domain of high-cost enterprise consulting teams.
"Modernizing a COBOL system once required armies of consultants spending years mapping workflows," Anthropic wrote. "Tools like Claude Code can automate the exploration and analysis phases that consume most of the effort in COBOL modernization. With AI, teams can modernize their COBOL codebase in quarters instead of years."
The announcement hit IBM at its core. COBOL — Common Business-Oriented Language, developed in the late 1950s — remains the backbone of global financial infrastructure, powering an estimated 95% of U.S. ATM transactions, hundreds of billions of lines of production code across banking, insurance, airlines, and government systems. IBM has been the dominant vendor for mainframe hardware and consulting services built around that ecosystem for decades.
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<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">Historic Market Reaction: Big Blue's Darkest Day in a Quarter Century</h2>
The 13.2% decline is IBM's largest single-session percentage loss since October 18, 2000, the height of the dot-com bust. Monday's drop dragged IBM's year-to-date loss to more than 24%, and its February decline to approximately 27%, threatening to mark the company's worst monthly performance in nearly six decades.
IBM's market capitalization plummeted from roughly $240.8 billion to approximately $208.7 billion in a matter of hours. The stock was also cited as a significant drag on the Dow Jones Industrial Average, amplifying broader index weakness in what traders described as a "sell first, ask questions later" environment.
The ripple effects extended well beyond IBM. Shares of Accenture and Cognizant Technology Solutions — both of which derive substantial revenue from legacy code modernization contracts — fell in sympathy, as investors reassessed the long-term viability of consultant-heavy IT transformation practices.
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<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">Claude Code: The Weapon That Rattled Wall Street</h2>
Anthropic's Claude Code tool claims to automate the most time-consuming and expensive components of COBOL modernization: mapping dependencies across thousands of lines of code, documenting workflows, tracing execution paths, identifying data flows between modules, and surfacing security risks — work that previously required teams of specialist developers operating over timelines of years.
"Hundreds of billions of lines of COBOL run in production every day, powering critical systems in finance, airlines, and government. Despite that, the number of people who understand it shrinks every year," Anthropic stated. "Legacy code modernization stalled for years because understanding legacy code cost more than rewriting it. AI flips that equation."
Alongside the announcement, Anthropic released a Code Modernization Playbook, signaling a full-scale push into enterprise digital transformation — a segment IBM has long dominated. The move follows Anthropic's introduction of Claude Code Security the prior week, which triggered a sharp sell-off in cybersecurity stocks including CrowdStrike and Datadog, both of which remained under pressure Monday.
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<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">Anthropic's $380 Billion Moment</h2>
The COBOL announcement arrives amid a period of explosive momentum for Anthropic. On February 12, the company closed a $30 billion Series G funding round led by Singapore's sovereign wealth fund GIC and hedge fund Coatue Management, valuing the Claude maker at $380 billion — more than double its September 2025 valuation of $183 billion.
Anthropic's annualized revenue has reached $14 billion, having grown more than tenfold in each of the past three years, driven substantially by Claude Code, which became generally available in May 2025. The company targets break-even by 2028, two years ahead of rival OpenAI, and is widely expected to pursue an IPO in the second half of 2026.
The funding round, among the largest private financings on record, cements Anthropic's position as the leading institutional AI platform. "Anthropic is the clear category leader in enterprise AI," said Choo Yong Cheen, Chief Investment Officer of private equity at GIC.
---
<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">Analyst Divide: Historic Overreaction or Structural Shift?</h2>
The street remains split on the severity of the IBM fallout. WedBush Securities analyst Dan Ives called the broader AI-disruption selloff "the most disconnected trade I've ever seen in my career on Wall Street," arguing that AI advancements could ultimately improve efficiency and margins at established enterprise players including IBM. JPMorgan characterized the premise that AI startups will upend the software industry overnight as "broken logic."
LPL Financial analyst Adam Turnquist noted that Monday's volatility reflected a "market narrative shift" rather than any demonstrated revenue decline at IBM. Wall Street's median 12-month price target for IBM currently stands at $337.50, implying substantial upside from current levels, with six of seven tracked firms maintaining buy-equivalent ratings.
IBM's IBM Z mainframe business posted its highest annual revenue in approximately 20 years in 2025, up 48% year-over-year, and the company's AI-integrated consulting backlog remains substantial. IBM has also offered its own COBOL modernization tools through the watsonx platform, though investor sentiment surrounding those offerings has now been severely tested.
---
<h2 class="text-2xl font-bold text-landing-text-primary mt-10 mb-6">Broader Market Fallout and What Comes Next</h2>
Monday's session unfolded against a backdrop of compounding pressures: renewed tariff uncertainty tied to Trump administration policy, persistent fears of AI-driven disruption across enterprise software, and a residual risk-off posture following Friday's cybersecurity sector rout. The Dow Jones Industrial Average closed lower with IBM serving as one of its sharpest drags.
With Anthropic continuing to roll out targeted industry disruptions — from legal to cybersecurity to COBOL — and a potential IPO on the horizon, the pace of AI-driven sector repricing is intensifying. IBM now faces the dual burden of defending its legacy mainframe revenue base while competing with a well-capitalized, high-growth AI adversary directly attacking its most defensible business lines.
The outcome of this particular contest — human consultant versus AI code agent — will define not only IBM's trajectory, but the future of enterprise technology modernization across the global economy.
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Mentioned tickers: `IBM, CRWD, DDOG, ACN, CTSH`

# IBM Suffers Worst Single-Day Crash Since 2000 as Anthropic's Claude Targets COBOL Legacy Empire

**IBM shares collapsed 13.2% on February 23, 2026 — their steepest single-day drop in over 25 years — after Anthropic unveiled a Claude Code capability that directly threatens the tech giant's multibillion-dollar COBOL modernization business.** The sell-off erased more than $31 billion in market value within a single session, and has placed IBM on track for its worst monthly performance since 1968.

---

## The Trigger: Anthropic's COBOL Modernization Bombshell

IBM shares closed at **$223.35**, down 13.2% from the prior session, after Anthropic published a blog post on February 23 asserting that its **Claude Code** AI tool can automate the most labor-intensive phases of **COBOL legacy system modernization** — a capability long considered the exclusive domain of high-cost enterprise consulting teams.

"Modernizing a COBOL system once required armies of consultants spending years mapping workflows," Anthropic wrote. "Tools like Claude Code can automate the exploration and analysis phases that consume most of the effort in COBOL modernization. With AI, teams can modernize their COBOL codebase in quarters instead of years."

The announcement hit IBM at its core. COBOL — Common Business-Oriented Language, developed in the late 1950s — remains the backbone of global financial infrastructure, powering an estimated **95% of U.S. ATM transactions**, hundreds of billions of lines of production code across banking, insurance, airlines, and government systems. IBM has been the dominant vendor for mainframe hardware and consulting services built around that ecosystem for decades.

---

## Historic Market Reaction: Big Blue's Darkest Day in a Quarter Century

The **13.2% decline** is IBM's largest single-session percentage loss since October 18, 2000, the height of the dot-com bust. Monday's drop dragged IBM's **year-to-date loss to more than 24%**, and its **February decline to approximately 27%**, threatening to mark the company's worst monthly performance in nearly six decades.

IBM's market capitalization plummeted from roughly **$240.8 billion** to approximately **$208.7 billion** in a matter of hours. The stock was also cited as a significant drag on the **Dow Jones Industrial Average**, amplifying broader index weakness in what traders described as a "sell first, ask questions later" environment.

The ripple effects extended well beyond IBM. Shares of **Accenture** and **Cognizant Technology Solutions** — both of which derive substantial revenue from legacy code modernization contracts — fell in sympathy, as investors reassessed the long-term viability of consultant-heavy IT transformation practices.

---

## Claude Code: The Weapon That Rattled Wall Street

Anthropic's **Claude Code** tool claims to automate the most time-consuming and expensive components of COBOL modernization: mapping dependencies across thousands of lines of code, documenting workflows, tracing execution paths, identifying data flows between modules, and surfacing security risks — work that previously required teams of specialist developers operating over timelines of years.

"Hundreds of billions of lines of COBOL run in production every day, powering critical systems in finance, airlines, and government. Despite that, the number of people who understand it shrinks every year," Anthropic stated. "Legacy code modernization stalled for years because understanding legacy code cost more than rewriting it. AI flips that equation."

Alongside the announcement, Anthropic released a **Code Modernization Playbook**, signaling a full-scale push into enterprise digital transformation — a segment IBM has long dominated. The move follows Anthropic's introduction of **Claude Code Security** the prior week, which triggered a sharp sell-off in cybersecurity stocks including **CrowdStrike** and **Datadog**, both of which remained under pressure Monday.

---

## Anthropic's $380 Billion Moment

The COBOL announcement arrives amid a period of explosive momentum for Anthropic. On February 12, the company closed a **$30 billion Series G funding round** led by Singapore's sovereign wealth fund **GIC** and hedge fund **Coatue Management**, valuing the Claude maker at **$380 billion** — more than double its September 2025 valuation of $183 billion.

Anthropic's **annualized revenue has reached $14 billion**, having grown more than tenfold in each of the past three years, driven substantially by **Claude Code**, which became generally available in May 2025. The company targets **break-even by 2028**, two years ahead of rival **OpenAI**, and is widely expected to pursue an IPO in the second half of 2026.

The funding round, among the largest private financings on record, cements Anthropic's position as the leading institutional AI platform. "Anthropic is the clear category leader in enterprise AI," said Choo Yong Cheen, Chief Investment Officer of private equity at GIC.

---

## Analyst Divide: Historic Overreaction or Structural Shift?

The street remains split on the severity of the IBM fallout. **WedBush Securities analyst Dan Ives** called the broader AI-disruption selloff "the most disconnected trade I've ever seen in my career on Wall Street," arguing that AI advancements could ultimately improve efficiency and margins at established enterprise players including IBM. **JPMorgan** characterized the premise that AI startups will upend the software industry overnight as "broken logic."

**LPL Financial analyst Adam Turnquist** noted that Monday's volatility reflected a "market narrative shift" rather than any demonstrated revenue decline at IBM. Wall Street's median 12-month price target for IBM currently stands at **$337.50**, implying substantial upside from current levels, with six of seven tracked firms maintaining buy-equivalent ratings.

IBM's **IBM Z mainframe business** posted its highest annual revenue in approximately 20 years in 2025, up 48% year-over-year, and the company's AI-integrated consulting backlog remains substantial. IBM has also offered its own COBOL modernization tools through the **watsonx** platform, though investor sentiment surrounding those offerings has now been severely tested.

---

## Broader Market Fallout and What Comes Next

Monday's session unfolded against a backdrop of compounding pressures: renewed tariff uncertainty tied to Trump administration policy, persistent fears of AI-driven disruption across enterprise software, and a residual risk-off posture following Friday's cybersecurity sector rout. The **Dow Jones Industrial Average** closed lower with IBM serving as one of its sharpest drags.

With Anthropic continuing to roll out targeted industry disruptions — from legal to cybersecurity to COBOL — and a potential IPO on the horizon, the pace of AI-driven sector repricing is intensifying. IBM now faces the dual burden of defending its legacy mainframe revenue base while competing with a well-capitalized, high-growth AI adversary directly attacking its most defensible business lines.

The outcome of this particular contest — human consultant versus AI code agent — will define not only IBM's trajectory, but the future of enterprise technology modernization across the global economy.

---

**Mentioned tickers:** `IBM, CRWD, DDOG, ACN, CTSH`

IBM shares collapsed 13.2% on February 23, 2026 — their steepest single-day drop in over 25 years — after Anthropic unveiled a Claude Code capability that directly threatens the tech giant's multibill...

IBM Suffers Worst Single-Day Crash Since 2000 as Anthropic's Claude Targets COBOL Legacy Empire

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