Williams Accountancy Corporation has notified affected individuals that an unauthorized third party gained access to its computer network and acquired certain files on December 25 and 26, 2025. The company says it discovered the intrusion on December 30, 2025, then contained the incident and brought in a forensic security firm to investigate. This kind of hacking or system intrusion is unfortunately common among smaller professional services firms; you can see a similar pattern play out in the Marquis Software Solutions data breach, where an outside attacker also accessed internal systems before the company caught it.
Based on the forensic review completed February 5, 2026, the accessed files could include information provided to Williams Accountancy that covers name, date of birth, Social Security number, and bank account number. The letter does not state a total number of people affected nationwide or in California, so it’s not possible to say from this notice alone how many individuals received it.
What information was exposed?
- Full name
- Date of birth
- Social Security number
- Bank account number
Williams Accountancy is offering a complimentary 12-month membership in Experian IdentityWorks Credit 3B. You can enroll at https://www.experianidworks.com/3bcredit using the personal activation code included in your letter, before the enrollment deadline stated there; if you’d rather enroll by phone or need help, call Experian at 877-288-8057 and have your engagement number on hand.
What should you do now?
- Activate the free Experian IdentityWorks Credit 3B membership before the deadline in your letter, since the activation code stops working after that date.
- Because your Social Security number and bank account number were involved, contact your bank to watch for unauthorized transactions or consider closing and reopening the account if you notice anything suspicious.
- Place a fraud alert or a credit freeze with Equifax, Experian, and TransUnion — a freeze in particular makes it much harder for someone to open new credit in your name.
- Pull your free credit reports at annualcreditreport.com and check them for accounts or inquiries you don’t recognize.
- Consider signing up for a service like Aura or LifeLock, which can alert you if your information appears elsewhere, such as on the dark web or in new account applications.
- Watch for tax-related identity theft, since a stolen SSN and date of birth can be used to file fraudulent tax returns in your name.
- Report any suspected identity theft to the FTC at www.ftc.gov/idtheft or 1-877-438-4338, and file a police report if you find evidence of misuse.
If you have questions, Williams Accountancy Corporation can be reached at 949-476-7737, Monday through Friday from 9 a.m. to 3 p.m. PST.