Tor  Gronborg

Tor Gronborg


There is no substitute for diligence.


Tor Gronborg is a partner in Robbins Geller Rudman & Dowd LLP’s San Diego office and a member of the Firm’s Management Committee. He often lectures on topics such as the Federal Rules of Civil Procedure and electronic discovery. Tor has served as lead or co-lead counsel in numerous securities fraud cases that have collectively recovered nearly $2 billion for investors. Most recently, he was a member of the Firm’s trial team in Hsu v. Puma Biotechnology, Inc., No. SACV15-0865 (C.D. Cal.), a securities fraud class action that resulted in a verdict in favor of investors after a two-week jury trial.

Tor’s work has included significant recoveries against corporations such as Cardinal Health ($600 million), Motorola ($200 million), Duke Energy ($146.25 million), Sprint Nextel Corp. ($131 million), Prison Realty ($104 million), CIT Group ($75 million), Wyeth ($67.5 million) and Intercept Pharmaceuticals ($55 million).

On three separate occasions, Tor’s pleadings have been upheld by the federal Courts of Appeals (Broudo v. Dura Pharm., Inc., 339 F.3d 933 (9th Cir. 2003), rev’d on other grounds, 544 U.S. 336 (2005); In re Daou Sys., 411 F.3d 1006 (9th Cir. 2005); Staehr v. Hartford Fin. Servs. Grp., 547 F.3d 406 (2d Cir. 2008)). He has also been responsible for a number of significant rulings, including In re Sanofi-Aventis Sec. Litig., 293 F.R.D. 449  (S.D.N.Y. 2013); Silverman v. Motorola, Inc., 798 F. Supp. 2d 954 (N.D. Ill. 2011); Roth v. Aon Corp., No. 04-C-6835, 2008 U.S. Dist. LEXIS 18471 (N.D. Ill. Mar. 7, 2008); In re Cardinal Health, Inc. Sec. Litigs., 426 F. Supp. 2d 688 (S.D. Ohio 2006); and In re Dura Pharm., Inc. Sec. Litig., 452 F. Supp. 2d 1005 (S.D. Cal. 2006).

Tor has been named a Plaintiffs’ Lawyer Trailblazer by The National Law Journal, as well as a Super Lawyer for the last seven consecutive years. He earned his Bachelor of Arts degree from the University of California, Santa Barbara, and his Juris Doctor degree from the University of California, Berkeley, where he was a member of the Moot Court Board. 


  • Plaintiffs’ Lawyer Trailblazer, The National Law Journal, 2019
  • Super Lawyer, 2013-2019

Practice Areas


University of California at Berkeley, Boalt Hall, J.D., 1995

  • Member, Moot Court Board

University of Lancaster, United Kingdom, 1992

  • Graduate work in International Relations and Strategic Studies 
  • Rotary International Fellowship

University of California at Santa Barbara, B.A., 1991

  • Recipient, AFL-CIO History Scholarship


  • California
  • United States Courts of Appeals for the Second, Seventh and Ninth Circuits
  • United States District Courts for the Northern, Central and Southern Districts of California
  • United States District Court for the District of Colorado

Notable Cases


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