List all cybersecurity incidents in a date range

Collects every 8-K reporting a cybersecurity incident over a date range, across Items 1.05, 8.01 and 7.01, and tabulates company, filing date, what happened and a link to the filing, sorted most recent first.

Prompt

Which companies disclosed a cybersecurity incident between March 1st 2026 and August 18 2026? Create a table to list all incidents: Company/Ticker, Reported At, Incident Details, Source Filing. Sort by reported at, starting with the most recent one.

Output

31 companies over five and a half months. 13 filed under Item 1.05, the mandatory material-incident item, 16 under Item 8.01 and 2 under Item 7.01.

When to use this prompt

• Checking whether any company in a portfolio or watchlist disclosed an incident in a given period.
• Finding every company hit by the same vendor breach. Evertec filed its own 8-K, and Popular filed a separate one about its own customer data.
• Counting disclosures per quarter and per item, to see whether mandatory Item 1.05 filings are rising against voluntary Item 8.01 ones.

What you get back

• Every incident in the window in one table, with the filing date, what was disclosed and a direct link to the 8-K.
• All three items covered, not only Item 1.05. Most incidents in this window were disclosed voluntarily under Item 8.01 or 7.01, so an Item 1.05 filter alone would have returned 13 of 31.
• Amendments tracked against the original filing, including cases where a company first disclosed under Item 8.01 and later confirmed materiality under Item 1.05.
• Clusters identified across filers, such as a vendor breach that surfaces again in its customers’ own filings days later.

Variations

• Change the date range, or run it quarter by quarter to build a time series.
• Restrict to Item 1.05 to count only incidents the filer determined to be material.
• Filter by SIC code to compare disclosure rates across sectors.
• Ask for the gap between the discovery date in the narrative and the filing date, which measures disclosure lag.

Filings used

• Form 8-K and 8-K/A filings disclosing a cybersecurity incident between March 1 and August 18, 2026, across Items 1.05, 8.01 and 7.01.
• 31 filers, including Stryker, West Pharmaceutical, Coca-Cola, Amgen, Medtronic, Hasbro, Navient and Levi Strauss.

Related prompts