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MonitoringMontana AG filing · December 17, 2025

Parexel International Data Breach: Understanding Your Notification

Parexel International, LLC experienced a data breach, exposing sensitive personal and health information of individuals. This incident, reported in Montana, compromised data such as Full Name, Social Security Number, and medical records. Affected individuals face potential risks like identity theft and fraud due to this exposure.

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This breach is real, not a scam. Parexel International, LLC officially reported it to the Montana Attorney General on December 17, 2025.

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State
Montana
Breach date
October 4, 2025
Reported
December 17, 2025

What may have been exposed

  • Full Name
  • Date of Birth
  • Social Security Number
  • Medical Record Number
  • Health Insurance ID Number
  • Clinical Trial Participation Records
  • Diagnosis and Treatment Information
  • Contact Information

Parexel International, LLC, a global clinical research organization, recently confirmed a data security incident. This breach, which occurred on October 4, 2025, was reported to the Montana Attorney General's Office on December 17, 2025. The company handles vast amounts of sensitive information related to clinical trials and patient data, making such an incident particularly concerning.

The compromised data categories are extensive and highly personal. They include your Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Clinical Trial Participation Records, Diagnosis and Treatment Information, and Contact Information. Exposure of this type of data can lead to serious risks such as identity theft, financial fraud, and medical identity theft, where criminals might use your health information for their benefit.

As a company that routinely collects and processes highly confidential health and personal data, Parexel International, LLC is obligated to maintain robust security measures. The occurrence of this data breach raises questions about whether appropriate safeguards were in place to protect individuals' sensitive information from unauthorized access. The investigation into this incident is currently ongoing.

If you received a data breach notification letter from Parexel International, LLC, it indicates that your sensitive information was among the records exposed. This letter serves as formal notice that your private data was compromised in the incident. It is important to understand what this means for your personal security.

We encourage anyone affected by the Parexel International, LLC data breach to review their notification letter carefully for specific details and recommended actions. Consider monitoring your credit reports and financial accounts for any unusual activity. Understanding your legal options regarding this data exposure is also a crucial step.

What to do if you were affected

Based on the categories of information reported in this filing, these steps can help limit the risk of identity theft and fraud.

  • Freeze your credit

    Place a free credit freeze with Equifax, Experian, and TransUnion. A freeze blocks new accounts from being opened in your name and can be lifted anytime.

  • Check for medical identity theft

    Review the Explanation of Benefits statements from your health insurer for services or claims you never received, which can signal misuse of your medical identity.

  • Stay alert to targeted scams

    Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.

  • Keep your notification letter

    Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.

Parexel International, LLC data breach notice and letter questions

Is the Parexel International, LLC data breach letter legit or a scam?
A notice from Parexel International, LLC in the mail matches the breach Parexel International, LLC reported to the Montana Attorney General on December 17, 2025. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Parexel International, LLC through a phone number or website you find yourself.
Where can I see the official Parexel International, LLC breach notice?
Parexel International, LLC's report is published by the Montana Attorney General: https://dojmt.gov/office-of-consumer-protection/reported-data-breaches/#mt-parexel-international-llc-2025 Compare it with the letter you received to confirm the dates and details match.
How many people were affected by the Parexel International, LLC data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Clinical Trial Participation Records, Diagnosis and Treatment Information, Contact Information. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Did Parexel International, LLC offer free credit monitoring?
Any free monitoring Parexel International, LLC is offering will be described in the notice you received, along with an activation code and a sign-up deadline. Because Social Security numbers are listed in this filing, identity monitoring and a credit freeze matter more than usual. Enrolling does not give up your right to bring a claim.
What should I do after getting the Parexel International, LLC data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
Is there a Parexel International, LLC data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Parexel International, LLC. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
Do I need a Parexel International, LLC data breach lawyer or attorney?
Talking to a data breach attorney costs nothing here. A lawyer can read your notice, explain your rights under your state's law and tell you whether a claim makes sense.
How much could a Parexel International, LLC data breach settlement or claim be worth?
There is no set amount, and no Parexel International, LLC settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists Full Name, Date of Birth, Social Security Number as involved. Keep receipts and records; they're what damages claims are built on.
Can I sue Parexel International, LLC over the data breach?
It depends on what was exposed, the law in Montana and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.

Source: Montana Attorney General filing

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