California’s Attorney General added 4 new data breach notices to its public list on June 26, 2026, according to the California AG Data Breach List.
Unlike Texas and Washington, California’s public list does not publish a residents-affected count - so this roundup tracks incident visibility and reporting dates, not population impact. For affected-resident totals, see our Texas OAG breach tracker.
June month-to-date now totals 34 notices on the California list through June 26, 2026.
Notices Reported June 26, 2026
| Organization | Breach Date(s) (if known) | Reported |
|---|---|---|
| AssetMark, Inc. | 05/15/2026 | 06/26/2026 |
| Blank Rome LLP | 05/21/2026 | 06/26/2026 |
| MCBS, LLC | 09/22/2025, 09/26/2025 | 06/26/2026 |
| Nissan North America Inc. | 05/27/2026, 06/09/2026 | 06/26/2026 |
California lists breach dates separately from reported dates - MCBS and Nissan filings describe incidents discovered weeks or months before June reporting.
Sector Highlights
Financial Services - AssetMark
AssetMark, Inc. is a wealth-management platform used by independent advisers. May 2026 breach activity reported to California on June 26 adds to ongoing financial-sector volume on the AG list - see our financial services tracker.
Law Firms - Blank Rome
Blank Rome LLP is a large Am Law 100 firm. Law-firm breaches remain a national trend - see our law firm breach dashboard.
Automotive - Nissan North America
Nissan North America Inc. reported breach dates spanning late May and early June 2026. Auto brands with large consumer bases face elevated post-breach phishing risk when notification letters go out.
Healthcare / Business Services - MCBS
MCBS, LLC reported September 2025 breach dates in a June 2026 filing - another example of long discovery-to-notification windows on the California list.
Independent Cybersecurity Audits
EmailMeNow domain audits on June 26, 2026 scored 5 filer domains in this batch.
5 of 5 show 15% Transport Security or below — a recurring gap that makes spoofed breach-notification email easier to deliver.
AssetMark, Inc. (assetmark.com) leads at 54% overall; Nissan North America Inc. (nissan.com) scores 45%.
Pattern: Scores below the 100% ideal on identity or transport still leave room for spoofed incident-response email — even when website headers score higher.
| Organization | Domain | Overall | Identity | Transport | Website | Risk |
|---|---|---|---|---|---|---|
| AssetMark, Inc. | assetmark.com | 54% | 50% | 15% | 45% | Average |
| Blank Rome LLP | blankrome.com | 54% | 50% | 15% | 45% | Average |
| MCBS, LLC | mcbs.com | 54% | 50% | 15% | 45% | Average |
| Nissan North America Inc. | nissanusa.com | 47% | 40% | 15% | 45% | Below Average |
| Nissan North America Inc. | nissan.com | 45% | 0% | 15% | 92% | Below Average |
Audit links: assetmark.com · blankrome.com · mcbs.com · nissanusa.com · nissan.com
Related trackers
- All state AG trackers
- Texas OAG YTD dashboard
- California AG breach list
- Washington AG tracker
- Healthcare AG breach tracker
- Washington healthcare breaches (2026)
- Washington law firm breaches (2026)
- CA June roundup
- TX July roundup
- WA May roundup
- TX Parks breach
- Have I Been Pwned
- HIBP July roundup
- Monitoring guide
Protect your California operations.
Run a free email security audit at audit.emailmenow.com or contact EmailMeNow IT Consulting.
Sources: California AG - Data Breach List | EmailMeNow audits