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Erna Mamikonyan's practice focuses on complex business litigation in state and federal courts, representing clients in matters involving antitrust, consumer class actions, constitutional law, business torts, and bankruptcy. She has experience in various aspects of litigation, including fact investigation, discovery, motions practice, pretrial and post-trial briefing, and appeals.

Erna is also committed to public service and maintains an active pro bono practice, representing clients in immigration proceedings. Prior to joining Jones Day, Erna served a one-year federal clerkship in the Central District of California, where she gained experience in a wide variety of civil and criminal legal matters.


  • Sutter Health wins complete defense verdict in landmark antitrust class actionJones Day won a complete defense jury verdict for Sutter Health in a landmark antitrust class action seeking $1.2 billion in treble damages.
  • ICANN obtains favorable judgment in lawsuit brought by DotConnectAfricaJones Day successfully defended ICANN (INTERNET CORP. FOR ASSIGNED NAMES & NUMBERS) against a lawsuit filed by DotConnectAfrica Trust (DCA) after ICANN denied its application for the top-level domain name ".AFRICA" for failure to demonstrate the necessary level of government endorsements.
  • Academic medical center secures dismissal of False Claims Act allegationJones Day secured a motion to dismiss on behalf an academic medical center, thereby resolving with prejudice all but one count alleging improperly billings of Medicare and Medi-Cal for services in violation of the False Claims Act and California False Claims Act.
  • American Residential Services obtains dismissal with prejudice of putative nationwide TCPA class actionOn behalf of American Residential Services, LLC, Jones Day obtained a dismissal with prejudice of a putative nationwide class action under the Telephone Consumer Protection Act ("TCPA").
  • Qualcomm defeats series of appellate writs by Apple in trade secret litigationJones Day represented Qualcomm Incorporated and Qualcomm Technologies, Inc. at the California Court of Appeal's Fourth District in opposing a series of three petitions for writ of mandate or prohibition brought by Apple Inc.
  • Qualcomm pursues trade secret and contract claims asserting Apple's misuse of Qualcomm's trade secret software and source codeJones Day represented Qualcomm Incorporated and Qualcomm Technologies, Inc. in a lawsuit asserting trade secret misappropriation and breach of contract claims against Apple Inc.
  • GreatCall wins affirmance of IP defense verdict in trade secret and patent telecom disputeJones Day won in binding arbitration and on appeal for GreatCall, Inc. in IP litigation brought by the company's founders.
  • Scholars file amicus brief in Ninth Circuit related to executive order on immigrationJones Day filed an amicus brief on behalf of a group of constitutional law scholars to assist the Ninth Circuit as it considered whether to grant an emergency stay of a temporary injunction entered by the District Court for the Western District of Washington.
  • Union Pacific Railroad defends against various conspiracy claims by OxbowJones Day is defending Union Pacific Railroad Company in an action pending in DC District Court involving alleged conspiracy claims relating to coal and petroleum coke shipments.