West Pharma Discloses Material Global Cybersecurity Attack, Data Exfiltration, and System Encryption
WST sits 55% above its 52-week low of $202.79.
Summary
West Pharmaceutical Services reported a material cybersecurity attack involving data exfiltration and system encryption, causing temporary global business disruption with unknown financial impact.
Key Events · Legal and Risk Events · WST
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Material Cybersecurity Incident
On May 7, 2026, the company determined it experienced a material cybersecurity attack, detected on May 4, 2026, involving data exfiltration by an unauthorized party and the encryption of certain systems.
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Global Business Disruption
The incident and the company's proactive response have temporarily disrupted business operations globally. Systems were taken offline for containment, and while core systems are restored, critical processes are restarting at some sites with others in process.
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Undetermined Financial Impact
The material impact on the company's financial condition and results of operations, if any, has not been determined at the time of this filing.
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Law Enforcement and Expert Engagement
The company promptly activated incident response protocols, notified law enforcement, and engaged external cyber-forensic experts, including Palo Alto Networks' Unit 42, to support investigation and recovery efforts.
Analysis · WST · Industrial Applications And Services
West Pharmaceutical Services has officially disclosed a material cybersecurity attack that led to data exfiltration and the encryption of certain systems. The incident, detected on May 4, 2026, has caused temporary global business disruption, impacting critical operations like shipping, receiving, and manufacturing. While core systems are being restored, the full timeline for complete operational recovery and the financial impact remain undetermined. This event introduces significant operational and financial uncertainty for the company.
How filings like this one have moved
In the 30 days to Oct 2, 2026, 40.6% of the 330 measured filings Wiseek scored 9 moved their stock by 5% or more by the next session's close. The median move was -0.38%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, WST was trading at $315.00 on NYSE in the Industrial Applications And Services sector, with a market capitalization of approximately $22.8B. The 52-week trading range was $202.79 to $330.88. This filing was assessed with negative market sentiment and an importance score of 9 out of 10.