Janus Capital Group, Inc. v. First Derivative Traders

564 U.S. 135 · Decided June 13, 2011 · Supreme Court of the United States

At a glance

Janus Capital Group, Inc. v. First Derivative Traders was decided on June 13, 2011 by a vote of 5–4. The Court reversed the lower court's decision. Justice Clarence Thomas wrote the opinion of the Court. SCDB classifies its main issue as “Securities regulation” in the Economic Activity area.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Full case caption

Janus Capital Group, Inc., et Al., Petitioners v. First Derivative Traders

SCDB identifiers: case 2010-063, docket 2010-063-01.

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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