Keffer Development Services, LLC, Data Security Breach Lawsuit (MDL No. 3159)
As of November 2, 2026, 13 cases are pending in the Keffer Development Services, LLC, Data Security Breach multidistrict litigation in the Eastern District of Michigan, before Judge Mark A. Goldsmith. The MDL was created on August 8, 2025.
Pending cases over time
From the JPML's monthly pending-MDL reports, September 2025 to November 2026.
| As of | Pending | Total, all time |
|---|---|---|
| Nov 2, 2026 | 13 | 13 |
| Dec 2, 2025 | 12 | 12 |
Court and case details
| Official name | IN RE: Keffer Development Services, LLC, Data Security Breach Litigation |
|---|---|
| MDL number | 3159 |
| Court | U.S. District Court for the Eastern District of Michigan |
| Judge | Mark A. Goldsmith (U.S. District Judge) |
| Master docket | 2:25-md-3159 |
| Motion to centralize filed | June 5, 2025 |
| MDL created | August 8, 2025 |
| Category | Data Breach and Consumer Privacy |
| Status | Active |
What an MDL is
When many people file similar federal lawsuits against the same company, the Judicial Panel on Multidistrict Litigation (JPML) can send them all to one judge for pretrial work such as evidence gathering and expert rulings. Each case stays a separate lawsuit, unlike a class action. A few cases are often tried first as “bellwether” trials, and cases that don’t settle or get dismissed can be sent back to the court where they were filed for trial.
The case counts above only include federal cases. Similar claims can also be filed in state courts, and those are not counted here.
Thinking about a claim? Whether you can join depends on your own facts and on deadlines that vary by state. A lawyer who handles class actions cases can tell you whether you qualify.
Class action lawyers in Detroit
Lawbamba lists 12 class action lawyers with an office in Detroit, Michigan, where this MDL is heard, the practice area that deals with the kind of case on this page. These 4 come first in that listing (how the order is set).
Matched by practice area and office location only. These lawyers are not connected to the records on this page and have not reviewed or endorsed it.
Other active data breach and consumer privacy MDLs
- MOVEit Customer Data Security Breach
233 pending · MDL 3083 - Change Healthcare, Inc., Customer Data Security Breach
161 pending · MDL 3108 - AT&T Inc. Customer Data Security Breach
140 pending · MDL 3114 - PowerSchool Holdings, Inc., and PowerSchool Group, LLC Customer Data Security Breach
76 pending · MDL 3149 - Snowflake, Inc., Data Security Breach
72 pending · MDL 3126 - Marriott International, Inc., Customer Data Security Breach
69 pending · MDL 2879
Source: case counts, judges and courts come from the monthly “Pending MDL Dockets” reports published by the United States Judicial Panel on Multidistrict Litigation. We update them each month. “Pending” means cases still open in the MDL; “total” counts every case ever sent to it, including those since dismissed, settled or sent back to their original courts.
Lawbamba is not affiliated with the JPML or any court, and this page is general information, not legal advice. We don’t estimate settlement values or tell you whether you qualify.