Matrixx Initiatives, Inc. v. James Siracusano
563 U.S. 27 · Decided March 22, 2011 · Supreme Court of the United States
Record summary. This page is generated from the Supreme Court Database’s coded data about the case. It describes who decided what, not the Court’s reasoning. Read the opinion itself before relying on it. Not legal advice.
At a glance
Matrixx Initiatives, Inc. v. James Siracusano was decided on March 22, 2011 unanimously (9–0). The Court affirmed the lower court's decision. Justice Sonia Sotomayor wrote the opinion of the Court. SCDB classifies its main issue as “Securities regulation” in the Economic Activity area.
Read the opinion
Case details
- Citations
- 563 U.S. 27 · 131 S. Ct. 1309 · 179 L. Ed. 2d 398 · 2011 U.S. LEXIS 2416
- Docket number
- 09-1156
- Decided
- March 22, 2011
- Argued
- January 10, 2011
- Court era
- Roberts Court
- Decision type
- Opinion of the Court (orally argued)
- Disposition
- Affirmed
- Outcome for petitioner
- The petitioning party did not receive a favorable disposition
- Vote
- 9–0 (unanimous)
- Majority opinion
- Sonia Sotomayor
- Opinion assigned by
- John G. Roberts Jr.
- How the case arrived
- Certiorari
- Issue (SCDB)
- Securities regulation
- Issue area
- Economic Activity
- Legal provision
- Securities Act of 1933, Securities Exchange Act of 1934, or Williams Act
- Type of law
- Federal statute
- Decision direction (SCDB)
- Liberal what this means
How the Justices voted
| Justice | Vote | Separate writing |
|---|---|---|
| Justice Antonin Scalia | Majority | |
| Justice Anthony M. Kennedy | Majority | |
| Justice Clarence Thomas | Majority | |
| Justice Ruth Bader Ginsburg | Majority | |
| Justice Stephen G. Breyer | Majority | |
| Chief Justice John G. Roberts Jr. | Majority | |
| Justice Samuel A. Alito Jr. | Majority | |
| Justice Sonia Sotomayor | Majority | Wrote an opinion |
| Justice Elena Kagan | Majority |
Full case caption
Matrixx Initiatives, Inc., et Al., Petitioners v. James Siracusano et al.
SCDB identifiers: case 2010-030, docket 2010-030-01.
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Cases on the same legal provision: Securities Act of 1933, Securities Exchange Act of 1934, or Williams Act
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- Merrill Lynch v. Manning
- Salman v. United States
- Cal Public Employees' Retirement Sys. v. Anz Securities
- Ed Plaut v. Spendthrift Farm, Inc.Law held unconstitutional
- Keith R. Gollust v. Ira L. Mendell, Etc.
Same Term, same area (Economic Activity)
- Costco Wholesale Corporation v. Omega, S.A.
- Jason M. Ransom v. Fia Card Services, N.A.
- Chase Bank USA, Na. v. James A. McCoy
- CSX Transportation, Inc. v. Alabama Department of Revenue
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- Cigna Corporation v. Janice C. Amara
Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error