People search Bloomberg data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 4 Bloomberg-linked incidents, with headline counts up to 325K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Bloomberg breach history matters
Bloomberg operates in Technology (United States). Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2019 — — Customer data
Cataloged incident. Hacked. Customer data. Exposed categories include Names, emails, addresses, and other PII. No attested victim count is published for this row yet. See the bloomberg2019 and canonical BreachHistory entry.
2017 — — Bloomberg: Nearly one thousand Bloomberg terminal users…
Cataloged incident. Nearly one thousand Bloomberg terminal users participating in an anonymous chat room had their identities unmasked this week when a London investment company sent out a list of the participants — including names and employers — to people in the chat room, The Post has learned.The data breach, one of the largest ever for former Mayor Mike Bloomberg’s financial information company, led moderators to shut down the metal and mining chat, as well as two others — one that focused on macroeconomic data Exposed categories include Personal information. BreachHistory cites approximately 325K+ affected records in this row. See the bloomberg2017 and canonical BreachHistory entry.
2013 — — Bloomberg: Bloomberg News reporters were able to monitor…
Cataloged incident. Bloomberg News reporters were able to monitor clients' usage of data terminals leased from Bloomberg LP. Goldman Sachs is one of the companies that has complained publicly while JP Morgan Chase, the Federal Reserve, and the United States Treasury Department have started investigations. It is unclear how many other organizations may have been affected. Reporters may have routinely retrieved login and contact information from data-services clients over the past 20 years. Some reporters had acce Exposed categories include Personal information. No attested victim count is published for this row yet. See the bloomberg2013 and canonical BreachHistory entry.
2012 — — Bloomberg: A group of former CQ employees were able to…
Cataloged incident. A group of former CQ employees were able to continue using log-ins and passwords to access sensitive information from The Economist Group after they left. CQ Roll Call is owned by The Economist Group. Many or all of the former CQ employees accessed the information while employed at Bloomberg. Bloomberg has already paid an unspecified amount to The Economist Group as compensation for the unauthorized access incident or incidents. It is not clear what type of information was exposed. Exposed categories include Personal information. No attested victim count is published for this row yet. See the bloomberg2012 and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple Bloomberg catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the Bloomberg company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/bloomberg · Latest: bloomberg2019.
Sources: BreachHistory catalog (4 rows for Bloomberg), company and regulator disclosures cited in individual breach records.