| Litigants: | Janus Capital Group, Inc. v. First Derivative Traders |
| Arguedate: | December 7 |
| Argueyear: | 2010 |
| Decidedate: | June 13 |
| Decideyear: | 2011 |
| Fullname: | Janus Capital Group, Inc., et al. v. First Derivative Traders |
| Docket: | 09-525 |
| Oralargument: | https://www.oyez.org/cases/2010-2019/2010/2010_09_525/argument |
| Usvol: | 564 |
| Uspage: | 135 |
| Parallelcitations: | 131 S. Ct. 2296; 180 L. Ed. 2d 166 |
| Prior: | Dismissed sub nom. In re Mutual Funds Inv. Litigation, 487 F. Supp. 2d 618 (D. Md. 2007); reversed, 566 F.3d 111 (3d Cir. 2009); cert. granted, . |
| Holding: | A service provider cannot be held liable in a private action under SEC Rule 10b-5. |
| Majority: | Thomas |
| Joinmajority: | Roberts, Scalia, Kennedy, Alito |
| Dissent: | Breyer |
| Joindissent: | Ginsburg, Sotomayor, Kagan |
| Italic Title: | force |
Janus Capital Group, Inc. v. First Derivative Traders, 564 U.S. 135 (2011), was a case before the Supreme Court of the United States in which the Court held that a service provider cannot be held liable in a private action under SEC Rule 10b-5.[1]