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Securities expert witnesses

Expert class library · 5 classes

The experts in securities class actions and Securities Act cases: event studies, market efficiency, loss causation and damages, and the economists the defense calls to answer them.

Each class is defined by role and method, never by a person or a firm. Open one for what its testimony turns on, how it is attacked, and the rulings, each summarised from the opinion and linked to it.

Usually retained by plaintiffs

Plaintiff event-study and loss-causation econometrician

Single-firm event study · Disaggregation of confounding information

Market-efficiency expert

Cammer factor analysis · Krogman factor analysis

Usually retained by the defense

Defense event-study econometrician

Market-model event study · Price impact rebuttal

Section 11 negative causation economist

Event study of disclosure dates · Market and industry index comparison

Retained by either side

Securities accounting and GAAP expert

GAAP compliance review · Restatement analysis

Recent rulings

The 12 most recent of 28 rulings in this practice, newest first. Each links to the free opinion on CourtListener and to the class it belongs to.

OutcomeCaseCourtExpert class
Exclusion reversedOhio Public Employees Retirement System v. Federal Home Loan Mortgage Corp.No. 25-3765 (6th Cir. Aug. 21, 2026)6th Cir. 2026Market-efficiency expert
Sent back for reviewGA Firefighters' Pension v. Anadarko Petroleum Corp.99 F.4th 7705th Cir. 2024Plaintiff event-study and loss-causation econometrician
AdmittedSi v. Bed Bath & Beyond Corp.No. 1:22-cv-02541D.D.C. 2024Defense event-study econometrician
AdmittedArk. Tchr. Ret. Sys. v. Goldman Sachs Grp., Inc.77 F.4th 742d Cir. 2023Defense event-study econometrician
LimitedIn re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action LitigationsMisc. No. 2013-1288 (D.D.C. Oct. 21, 2022)D.D.C. 2022Defense event-study econometrician
Sent back for reviewGoldman Sachs Group, Inc. v. Arkansas Teacher Retirement System594 U.S. 113U.S. 2021Defense event-study econometrician
Sent back for reviewCarpenters Pension Trust Fund v. Allstate Corp.966 F.3d 5957th Cir. 2020Defense event-study econometrician
AdmittedAngley v. UTi Worldwide Inc.311 F. Supp. 3d 1117C.D. Cal. 2018Market-efficiency expert
AdmittedCity of Cape Coral Mun. Firefighters' Ret. Plan v. Emergent Biosolutions, Inc.322 F. Supp. 3d 676D. Md. 2018Market-efficiency expert
AdmittedWaggoner v. Barclays PLC875 F.3d 792d Cir. 2017Market-efficiency expert
AdmittedWillis v. Big Lots, Inc.242 F. Supp. 3d 634S.D. Ohio 2017Market-efficiency expert
AdmittedIBEW Local 98 Pension Fund v. Best Buy Co.818 F.3d 7758th Cir. 2016Defense event-study econometrician

Other practice areas

  • Antitrust
  • Commercial
  • Intellectual property
  • Mass tort and product liability
  • Environmental and toxic tort
  • Personal injury
  • Transportation
  • Employment
  • Consumer class actions
  • Medical malpractice
  • Product engineering
  • Civil rights
  • Forensic science
  • Healthcare fraud and False Claims Act
  • Family law
  • Insurance
  • Construction
  • Bankruptcy and valuation
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The library summarises public decisions for orientation; it is not legal advice. Read the opinion before relying on any ruling. No individual expert is named.

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