A.B. Data, Ltd. Class Action Administration: Why You Got That Letter — and How to Verify It
If a letter or e-mail from “A.B. Data, Ltd.” or a return address reading “c/o A.B. Data, Ltd.” landed in your mailbox, the company itself is real: it's a Milwaukee, Wisconsin firm that courts appoint to administer class-action settlements, including the EpiPen consumer antitrust settlement. But A.B. Data publishes no central list of its cases and no site-wide claim-status lookup, which makes a quick sanity check harder — and scammers do borrow legitimate administrators' names. The right move is to verify the specific case named in your notice, not just the company name.
Editorially Reviewed — Content reviewed for accuracy using published legal research, government data, and verified court records. See our methodology
Reviewed by Leonard Goldberg, Editor · Last updated
What Is A.B. Data, Ltd.?
A.B. Data, Ltd. is a Milwaukee, Wisconsin company founded in 1981, originally as a direct-marketing firm working with nonprofit, charitable, and advocacy organizations. Its class-action administration business — the part that sends the notices people search for — is presented on its own site as part of the wider A.B. Data group of companies; no outside owner or investor is named. When a class action settles or a court requires notice to a defined group, a neutral administrator is appointed to find class members, run the case website and call center, process claims, and issue payments — that is the role A.B. Data plays. Its first documented case was In re Holocaust Victim Assets Litigation (E.D.N.Y., Case No. CV96-4849), where the firm says it served as one of the principal Notice Administrators, collecting over 500,000 questionnaires in Phase I and delivering notice to more than 10,000 Jewish communities in 109 countries in Phase III (the firm's own figures, not independently audited). See our broader guide to settlement administrators for how this kind of firm operates across different cases.
Case Details
Operating address: 600 A.B. Data Drive, Milwaukee, WI 53217, (414) 961-6400. General e-mail: info@abdataclassaction.com. Website: abdataclassaction.com. Headquarters note: the company's own “Our Story” page describes itself as “Headquartered in Milwaukee, Wisconsin,” while its Contact page lists a Palm Beach Gardens, FL office first among six locations — we could not verify which address is the current legal headquarters. Other listed offices: 5080 PGA Boulevard, Suite 209, Palm Beach Gardens, FL 33418, (561) 336-1801; One Battery Park Plaza, 32nd Floor, New York, NY 10004, (646) 290-9137; 1156 15th Street, NW, Suite 320, Washington, DC 20005, (866) 217-4470; 71-75 Shelton Street, Covent Garden, London WC2H 9JQ, United Kingdom, +44 20 4586 1892; 19 Weissburg Street, Tel Aviv 69358, Israel, +972 (3) 720-8782. Settlement-mail return addresses we verified directly — each active case uses its own P.O. Box, all in Milwaukee, WI 53217: P.O. Box 173096 (Aterian / “Mueller Settlement”), P.O. Box 173107 (Restasis Settlement), and P.O. Box 173113 (EpiPen Settlement). All three sit in the same contiguous 1730xx–1731xx numbering block, and 53217 is also the ZIP code of the 600 A.B. Data Drive office. The line printed on the envelope reads “c/o A.B. Data, Ltd.” — not “A.B. Data Class Action Administration.”
Why Did I Get a Letter or Email From A.B. Data?
How to Tell a Real A.B. Data Notice From a Scam
Five checks: (1) The notice names a specific, checkable case — for example In re EpiPen Marketing, Sales Practices and Antitrust Litigation, or Stacy Dorcas v. Aterian, Inc., No. CIVSB2222117 (San Bernardino County Superior Court) — that you can look up in court records or news coverage. (2) It points to that case's own official website (epipenclassaction.com, muellersettlement.com, restasislitigation.com), not a generic or unrelated domain. A.B. Data does not maintain a central, public case list, so there is no company-wide site to cross-check against — verifying the case itself is what stands in for that. (3) Filing or enrolling is free — any request for a “processing fee” is a scam. (4) The sender's e-mail domain matches abdataclassaction.com or the case's own domain, not a misspelled lookalike. (5) When unsure, don't click anything in the message: type the case website into your browser yourself, or call the number printed on the notice — or A.B. Data's general Milwaukee line, (414) 961-6400 — rather than any number given in the message itself.
How A.B. Data Actually Pays You
Settlements A.B. Data Is Handling Right Now
- 1
EpiPen Consumer Antitrust Settlement
In re EpiPen Marketing, Sales Practices and Antitrust Litigation, against Mylan-related defendants. Claim filing is closed, but as of the site's March 26, 2026 update A.B. Data is running a <strong>second distribution</strong> by e-mail to eligible claimants — a live reason people are hearing from A.B. Data right now. A related Pfizer settlement is handled on the same site. Official site: epipenclassaction.com. Hotline: 1-877-221-7632.
- 2
Aterian / “Mueller Settlement” — Product-Labeling Claims
Stacy Dorcas v. Aterian, Inc., Case No. CIVSB2222117, Superior Court of California, County of San Bernardino, over Austrian-flag product-labeling claims. When we checked on September 2, 2026, the case site was live and current (copyright 2024); no deadline or settlement amount appeared on the contact page we reviewed. Official site: muellersettlement.com. Hotline: 877-933-2881.
- 3
Restasis Antitrust Settlement
An antitrust case over Allergan's Restasis eye-drop medication, with the official site naming A.B. Data as “Notice and Claims Administrator.” When we checked on September 2, 2026, the site was live (copyright 2022); no deadline or amount appeared on the contact page we reviewed. Official site: restasislitigation.com. Hotline: 1-877-868-6810.
- 4
Other Cases Reported, but Not Independently Confirmed
A.B. Data does not publish a central, official list of its active cases on abdataclassaction.com. A third-party claims aggregator, Claim Depot, separately lists A.B. Data as administrator on several other 2026–2027 cases — among them a $200 million Sun Pharmaceutical / Taro generic-drug antitrust settlement (deadline reported as November 9, 2026). We have not verified any of these against an official settlement website, so treat them as <strong>reported, not confirmed</strong> — look up the case name yourself before assuming a connection to a notice you received.
- 5
What A.B. Data Cannot Do
We found no independent controversy or regulatory finding involving A.B. Data, though we did not run a dedicated search for one. What's true of any court-appointed administrator applies here too: A.B. Data cannot decide who is eligible for a settlement, cannot change a payment amount set by the settlement agreement, cannot charge a fee to process or release a payment, and cannot guarantee outcomes it doesn't control, such as final court approval. A message claiming to be from A.B. Data that asks for money, a bank login, or promises anything outside those limits is the tell that something is wrong.
Scam Alert: Watch for A.B. Data Impersonation
A.B. Data doesn't publish a master case list, which makes it harder for a worried recipient to do a quick company-wide lookup — and easier for an impersonation to go unchecked. Keep these three points in mind:
No fee is ever required
No legitimate class-action administrator — A.B. Data included — charges class members to file a claim, receive a payment, or “release” money that's supposedly waiting. A request for a processing fee, gift cards, or cryptocurrency is a scam, full stop.
The case name has to check out
A real A.B. Data notice ties to a specific, named lawsuit or settlement — for example In re EpiPen Marketing, Sales Practices and Antitrust Litigation, or Stacy Dorcas v. Aterian, Inc., No. CIVSB2222117. Search the case name and number independently, through court records or news coverage, before responding to anything. A message that only says “you have a payment waiting” with no case name attached is not how A.B. Data notices work.
Match the sender to the case's own domain
Legitimate notices link to that case's own official site — epipenclassaction.com, muellersettlement.com, restasislitigation.com — or to abdataclassaction.com itself, never a lookalike spelling. Type the address into your browser yourself instead of clicking a link in an unsolicited text or e-mail, and call the phone number printed on the notice or official site, not one given inside a suspicious message.
A.B. Data Class Action Administration FAQ
Is A.B. Data, Ltd. legit?
Yes. A.B. Data, Ltd. is a Milwaukee, Wisconsin company, founded in 1981, whose class-action administration business runs court-appointed settlements such as the EpiPen consumer antitrust settlement and the Restasis antitrust case. That doesn't mean every message using its name is genuine — scammers borrow the names of real administrators, so verify the specific case before acting on any notice.
Why is A.B. Data contacting me about a case I never joined?
Court-appointed administrators notify class members using the defendant's own records — customer lists, purchase history, membership data — not sign-up lists. If your information appeared in those records, the court requires A.B. Data to find and notify you, which is the letter or e-mail you received.
Is A.B. Data's class-action work the same as its direct-marketing business?
No, but they're related. A.B. Data, Ltd. was founded in 1981 as a direct-marketing firm working with nonprofit, charitable, and advocacy organizations. Its class-action administration work — the part that sends the notice you're reading about — is presented on its own site as part of the same A.B. Data group of companies; we could not verify exactly when that class-action business began operating.
How does A.B. Data pay out settlements?
Many settlements use A.B. Data's own “Digital PayPortal™,” described on its site as offering “instant fund delivery and over 250 digital payment options like Amazon, PayPal, Visa, Target, and many other premium retailers and grocers.” Exactly which options are offered — and whether a mailed check is also available — depends on the specific settlement, so check your notice or the case's official website.
Is there one phone number for A.B. Data?
The company's general Milwaukee number is (414) 961-6400, but each settlement has its own toll-free hotline printed on the notice and case website — for example 1-877-221-7632 for the EpiPen settlement, 877-933-2881 for the Aterian “Mueller Settlement,” and 1-877-868-6810 for the Restasis settlement. Use the number tied to your specific case, not one from an unsolicited message.
How do I check my claim status with A.B. Data?
Go directly to the official website named on your notice — for example epipenclassaction.com for the EpiPen settlement — and use the claim or case number printed there. A.B. Data does not publish a central case list or status lookup on abdataclassaction.com, so there is no single site-wide portal to check; each case runs its own site.
I got an unexpected e-mail or check from A.B. Data — should I trust it?
Verify first. Match the case name in the message to a real, findable lawsuit or settlement using court records, news coverage, or the case's own official website, then contact that case's hotline or e-mail address to confirm before cashing a check or clicking a link. A.B. Data's own EpiPen settlement site addresses this directly, telling recipients: “This email being sent is not spam. It is an official communication from the Court-authorized Settlement Administrator regarding your approved claim” (site update dated March 26, 2026) — but that reassurance applies to that specific case, not to every message that claims to be from A.B. Data.
What does “c/o A.B. Data, Ltd., P.O. Box 173xxx, Milwaukee, WI 53217” on my envelope mean?
It means a court-appointed settlement is mailing you through A.B. Data's Milwaukee return-mail operation. We independently verified three such boxes, each tied to a different case: P.O. Box 173096 for the Aterian “Mueller Settlement” (product-labeling claims), P.O. Box 173107 for the Restasis antitrust settlement, and P.O. Box 173113 for the EpiPen antitrust settlement — all three in the same contiguous numbering block and the same 53217 ZIP code as A.B. Data's 600 A.B. Data Drive office. (A fourth box, 173057, turned up attached to a Waste Pro settlement in a search-engine snippet, but the site it pointed to no longer resolves, so we could not confirm it directly.) The envelope itself reads “c/o A.B. Data, Ltd.” — the notice inside should name a specific case; if it doesn't, that's worth double-checking before you respond.
Separate from this case: were you injured in the last 2 years?
Class-action payouts are fixed amounts through an administrator. A personal injury claim is a different case — and often worth far more. Free estimate, no obligation.
Related Consumer Brand Lawsuits
What Is a Settlement Administrator?
Who appoints them, what they can and cannot do, and the firms whose names show up on envelopes
Return to Kroll — Is That Letter Legit?
The most-searched administrator envelope, explained
Phoenix Settlement Administrators
Same question, California administrator
Data Breach Settlement Hub
200+ active and settled data breach cases tracked