IBM shares suffered their worst single-day decline since the pandemic on Tuesday, tumbling roughly 9% as investors fled software and professional services stocks amid mounting fears that artificial intelligence could fundamentally disrupt the enterprise technology sector.

The stock hit $286.41 in afternoon trading, erasing nearly $20 billion in market value and emerging as one of the heaviest weights dragging down the Dow Jones Industrial Average. IBM and Salesforce together accounted for the bulk of the blue-chip index's 166-point decline.

The Anthropic Catalyst

The immediate trigger for the selloff was Anthropic's launch of new AI tools designed to automate professional services tasks that have long been IBM's bread and butter. The startup's Claude Cowork "agent"—an AI program designed to perform complex tasks rather than simply answer questions—rolled out specialized add-ons for the legal profession on Tuesday.

While the legal-focused tools don't directly compete with IBM's core offerings, they sparked a broader reassessment of which enterprise software businesses might be vulnerable to AI disruption. If AI can automate high-value legal work, investors reasoned, consulting, integration services, and enterprise software could be next.

"We've got an expensive market and expectations are really high. Many areas, especially around AI, are priced for perfection. The question investors are asking is: who benefits from AI, and who gets disrupted by it?"

— John Campbell, Senior Portfolio Manager, Allspring Global Investments

The Broader Software Carnage

IBM's decline was part of a sweeping selloff across the software sector. Salesforce fell 7%, ServiceNow dropped 7.4%, and Microsoft shed nearly 3%. The WisdomTree Cloud Computing Fund tumbled 3.2%, extending its losing streak to six consecutive sessions—the longest of 2026.

The iShares Expanded Tech-Software Sector ETF has now fallen approximately 28% from its recent high and is down 17% year-to-date. Individual names across enterprise software sank to fresh 52-week lows, including:

  • ServiceTitan
  • Atlassian
  • DocuSign
  • Workday
  • Adobe
  • HubSpot

IBM's Unique Vulnerability

Among the software giants, IBM occupies a particularly precarious position in the AI disruption narrative. The company's consulting division—which accounts for roughly 30% of revenue—has historically charged premium rates to help enterprises implement and customize complex software systems.

If AI tools can automate portions of that integration and customization work, IBM's professional services model could face structural pressure. The company has positioned itself as an AI leader through its watsonx platform and a "generative AI book of business" that has topped $12.5 billion. But that narrative has done little to protect the stock during the current selloff.

The timing is particularly painful because IBM just reported better-than-expected fourth-quarter results last week. Software and infrastructure saw double-digit growth, and the company beat Wall Street estimates for both revenue and profit. Yet strong fundamentals offered no shelter from AI-related anxiety.

After-Hours Pressure Continues

The selling didn't stop at the closing bell. IBM shares dropped an additional 6.5% in after-hours trading, slipping to $294.31 as investors continued to reassess the company's positioning in an AI-transformed landscape.

The extended-hours decline suggests that the market has not yet found a clearing price for software stocks facing potential disruption. Until investors can quantify the actual revenue impact of AI automation—rather than speculating about theoretical threats—volatility is likely to persist.

The Dow's Price-Weighted Problem

IBM's decline had an outsized impact on the Dow Jones Industrial Average due to the index's unusual price-weighted methodology. Unlike the market-cap-weighted S&P 500, the Dow gives more influence to stocks with higher share prices regardless of company size.

At approximately $300 per share, IBM commands significant weight in the 30-stock index. Combined with Salesforce—which fell from around $211 to below $194—the two software stocks were responsible for the majority of the Dow's decline even as other index components posted gains.

The Bull Case Persists

Not everyone sees Tuesday's selloff as warranted. Bulls argue that IBM's diversified business model and entrenched position in enterprise IT actually make it well-suited to benefit from AI adoption rather than be disrupted by it.

The company's hybrid cloud strategy and Red Hat acquisition have positioned it to help enterprises modernize their infrastructure—work that AI tools are unlikely to automate away. And IBM's deep relationships with Fortune 500 companies provide a distribution advantage that AI startups will struggle to replicate.

At current levels, IBM trades at a significant discount to both its historical multiples and the broader technology sector. For value-oriented investors willing to look past near-term volatility, the selloff may represent an opportunity to buy a blue-chip technology company at a depressed valuation.

What's Next

The durability of the software selloff will likely depend on how quickly AI tools actually begin to impact enterprise spending patterns. While Anthropic's legal automation tools are impressive, they remain early-stage products that have yet to prove they can replace—rather than augment—human professionals at scale.

For IBM specifically, the key question is whether the company can demonstrate that its AI investments are accelerating revenue growth faster than potential disruption is eroding its consulting franchise. Until that proof point arrives, the stock may continue to trade under a cloud of uncertainty.