FEDERALItem 1.05 · mandatoryMalwareHealthcareManufacturingHealthcareRansomwareData ExfiltratedData EncryptedRansom DemandedLowContained

West Pharmaceutical Services

bd_6cf422be95e67c2f · schema v1 · pii pii-v1

Severity

Low

Discovered

May 4, 2026

Filed

May 20, 2026

To disclose

16 days

Affected

Not disclosed

Linked

2 filings

Confidence

85%

Full breach record for West Pharmaceutical Services →

West Pharmaceutical Services filed an 8-K/A on May 20, 2026 amending its May 11 disclosure of a material cybersecurity incident. The company detected an intrusion on May 4, 2026 and determined materiality on May 7, 2026. An unauthorized party exfiltrated certain data and encrypted certain systems. The company took systems offline globally, notified law enforcement, and engaged external cyber-forensic experts. Core enterprise and manufacturing systems have been restored; no unauthorized activity has been observed since May 5, 2026.

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SEC clockMateriality determined May 7, 2026 → Filed May 20, 202613d ✗ SEC 4-day late16 days discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 16 days

May 4, 2026

Begins

May 4, 2026

Discovered

May 7, 2026

Scope determined

May 20, 2026

Filed

vs. sector median

9 wks faster

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

SEC 8-Kbd_7869724e0f5d9c922026-05-11 · +9dCandidate

Name: West Pharmaceutical Services
norm: west pharmaceutical
SEC CIK: 0000105770
Domain: westpharma.com

Name: West Pharmaceutical Services
norm: west pharmaceutical
SEC CIK: 0000105770
Domain: westpharma.com
Industry: Pharmaceutical packaging/delivery components and devices
Industry: HealthcarellmManufacturingllm

Discovered: May 4, 2026
Breach occurred: May 4, 2026 – May 5, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: May 7, 2026
Notification sent: —
Affected individuals: Not disclosed
Data types: —
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Filed Form 8-K/A (Amendment No. 1) with the SEC under Item 1.05Notifying law enforcement

During the incident: Activated its incident response protocols
Proactively taking systems offline globally for containment purposes
Notifying law enforcement
Engaging external cyber-forensic experts
Changes made: Core enterprise systems restored
Critical processes for manufacturing, receiving and shipping restarted at all sites
Now fully operational across its manufacturing, supply chain and commercial sites globally
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 16 days(16 days from discovery to filing)
Compliance flags: SEC 4-day late · 13d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.
Clock breakdown: Statute Window Elapsed Threshold Status
SEC
Materiality determined: May 7, 2026
→ Filed: May 20, 2026
13d cal. 4 business days SEC 4-day late

Statute	Window	Elapsed	Threshold	Status
SEC	Materiality determined: May 7, 2026 → Filed: May 20, 2026	13d cal.	4 business days	SEC 4-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings

View merged incident ↗

SEC 8-KMay 11 · first

SEC 8-K+9d · this page

Pattern: first filing May 11, last May 20 — a 9-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/105770/000010577026000077/wst-20260507.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: May 20, 2026
Raw hash: 35ac3476d27d5c23e5515f04081130a628ed8a802b3f560316ff26dbe07f2d47

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Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityWest Pharmaceutical Services

Victim entityWest Pharmaceutical Services

Incidentdiscovered May 4, 2026

Stated responseActivated its incident response protocols

ComplianceSEC 4-day late

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing