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Admitted to Practice

  • Washington
  • U.S. District Court Western District of Washington
  • U.S. Court of Appeals 9th Circuit

Brendan T. Mangan

Brendan Mangan is an experienced litigator who focuses on securities, corporate governance, and partnership disputes, as well as other complex commercial matters. He defends companies, officers, and directors against shareholder actions in state and federal courts. He has also litigated and arbitrated commercial disputes across a variety of industries, including computer software and hardware, financial services, aircraft, telecommunications, electricity generation and transmission, online services, and others.

Practice Highlights

Securities / Corporate Governance / Partnership Litigation
  • Defended mutual fund company against alleged whistleblower claims by former general counsel. Complete defense verdict after jury trial in federal court. (2017)
  • Lead counsel for underwriters in defense of claims concerning attempted $143 million bond investment. All claims dismissed upon defendants’ summary judgment motion. (2016)
  • Lead counsel in action to recover escrow fund due to pre-merger misrepresentations by acquired company. Obtained substantial recovery through settlement. (2015)
  • Lead counsel for regional hospital in action against limited partnerships for failure to make pro rata distributions. Obtained $3.7 million judgment, including an attorney fee award. (2015)
  • Lead counsel for founder of public biotech in successful action to compel shareholders meeting, leading to his reinstatement as CEO. (2015)
  • Defended directors of public software company against derivative claims for allegedly inadequate oversight. Settled during discovery. (2015)
  • Lead counsel for Seattle bank against claims arising from devaluation of phantom stock units. Settled after partial dismissal of claims. (2013)
  • Defended a public software company against a shareholder action to enjoin votes at the annual meeting. Claims dismissed. (2012)
  • Lead counsel for company officers against claims for breach of fiduciary duty. All claims were dismissed, with attorneys’ fees awarded. (2012)
  • Defended former officers of national bank against shareholder class actions in federal court. Settled during discovery. (2011)
  • Lead counsel for semiconductor company against challenge to cash-out merger. Settled on non-financial terms and the merger closed. (2011)
  • Lead counsel for wireless phone company against claims by minority partners. All claims dismissed; affirmed by 9th Circuit. (2008)

Consumer / Antitrust Litigation
  • Lead counsel for online travel services company in defense of putative class action claims alleging inadequate disclosures. (Ongoing)
  • Lead counsel for on-line travel services company in defense of consumer class action claims challenging sufficiency of fee disclosures. Defeated motion for class certification; settled individual claim. (2016)
  • Lead counsel for major airline in defense of antitrust claims by vendor. Settled for nominal amount while motion to dismiss was pending. (2011)
  • Defense of antitrust counterclaims against major chip manufacturer in its infringement lawsuit concerning telecommunications patents. (2006)
  • Defense of antitrust claims by Department of Justice challenging membership rules of payment card associations. (2004)
  • Defended major software company against antitrust claims by defunct maker of computer operating systems. Settled through mediation. (2003)

Other Commercial Litigation
  • Lead counsel for jet parts maker against claims by distributor. Settled after nearly all claims were dismissed upon summary judgment. (2017)
  • Lead counsel in multiple matters to protect trade secrets from release in response to Public Records Act requests. In one such case, on behalf of a genome sequencing equipment maker, a bench trial resulted in a permanent injunction against release of patent license terms. (2015)
  • Defended mechanical contractor against claims by former owners of acquired company. Secured favorable award after arbitration. (2014)
  • Lead counsel for electric utility in arbitration over operation of high capacity transmission lines. Settled on eve of arbitration hearing. (2013)
  • Lead counsel in unrelated actions against tax preparers for professional negligence. Both settled favorably. (2012 & 2015)
  • Lead counsel for airline in action for breach of contract to maintain Boeing fleet. Jury trial resulted in substantial damage award. (2001)
  • Lead counsel in multiple lawsuits and arbitrations involving intellectual property rights, including warranty claim by cell phone manufacturer against software developer (resulting in substantial award after AAA hearing); breach of license claim by biometric services firm against foreign police agencies (settled favorably during discovery); and contract claim by payment processing company against software developer (settled after court ordered defendant to turn over source code).
  • Pursued lawsuits to obtain insurance for environmental cleanups for mining company, chemical distributor, and window manufacturer.

Additional Qualifications

  • Former Managing Shareholder, Heller Ehrman LLP, Seattle
  • Judicial Clerk, Hon. Carolyn R. Dimmick, U.S. District Judge for the Western District of Washington, 1987-1989

Professional & Community Activities

  • Former Board Member, Greater Seattle Chamber of Commerce
  • Former Trustee, Intiman Theater

Professional Recognition

  • Selected to "Washington Super Lawyers," Thomson Reuters, 2011-2017
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