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The Paul, Weiss Litigation Department is led by a team of the country’s most accomplished trial lawyers. Our litigators in New York, San Francisco and Washington, D.C. handle the most complex and demanding lawsuits, class actions, government investigations, criminal prosecutions and restructurings. Our clients include Fortune 50 corporations and other prominent companies in the financial services, investment, medical device, pharmaceutical, sports, technology, energy, media and insurance industries. Every day, we are called on by chief executives, board chairs, general counsel, investors and entrepreneurs for our unmatched trial skills, sophisticated business judgment and renowned strategic advice.

Representative Engagements

The Paul, Weiss Litigation Department continues to be involved in cases that shape financial markets and corporate boardrooms, representing many of the world's leading corporations in their most sensitive and complex matters. Client matters have included:

    • Exxon Mobil Corporation in climate change-related investigations and suits brought by regulators, including state attorneys general deploying untested liability theories. These matters include representing ExxonMobil in an SEC investigation concerning climate change-related disclosures that was closed with a no-action determination. The firm also won a complete defense verdict in a landmark securities fraud action brought by the New York Attorney General seeking $1.6 billion in damages—the first climate change-related lawsuit to be tried to verdict nationally. Paul, Weiss is also advising ExxonMobil on government tort, shareholder securities and other climate change-related matters arising in various proceedings worldwide.
    • The National Football League in the defense and landmark settlement, upheld on appeal, of hundreds of lawsuits filed by thousands of former NFL players seeking to hold the League liable for allegedly concealing the risks associated with concussions sustained while playing professional football. We continue to serve as counsel for the NFL in the implementation of the 65-years settlement. 

    • Citigroup in virtually all of its major litigation and regulatory enforcement matters, including:
      • a complete defense win in an arbitral panel ruling, subsequently upheld by a federal district and an appellate court, in a $7.5 billion ICDR arbitration brought by the Abu Dhabi Investment Authority (ADIA);
      • a multi-year federal grand jury investigation of its compliance with BSA/AML requirements that resulted in a non-prosecution agreement and a significantly reduced penalty; and
      • a complete defense win in a $30 billion claim against Citigroup brought by Parmalat, and a $364.2 million jury verdict, upheld on appeal, on Citigroup’s counterclaims against Parmalat, culminating in a judgment by Italy’s Supreme Court finding our verdict, by then tripled in value, final and enforceable in Italy.



  • News Corporation and its subsidiary News America Marketing (NAM)in several antitrust matters, including most recently in securing the dismissal of an antitrust claim brought by competitor Valassis Communications alleging that NAM violated a consent order resolving an earlier dispute through unlawful bundling and tying; and the favorable settlement of a significant antitrust class action brought by customers of NAM’s in-store marketing products, including consumer products companies Dial, Heinz and Smithfield Foods, claiming that NAM illegally monopolized an alleged market for in-store promotional services by engaging in a variety of alleged exclusionary practices.



  • IBM in winning an injunction at trial, affirmed on appeal by the Second Circuit, in a high-profile trade secrets case that prohibited a former senior executive from accepting a competing leadership position at a competing technology company. Paul, Weiss has represented IBM in several previous high-profile litigations and settlements regarding the enforcement of employee restrictive covenants, non-competition agreements and equity clawback contracts.  
  • Mastercard in three of the largest antitrust litigations pending nationally, including litigation challenges, and a subsequent settlement, of payment card “interchange” fees and certain rules governing merchants’ acceptance of payment cards; antitrust and consumer protection class actions on behalf of independent ATM operators and consumer groups challenging Mastercard’s ATM access fee non-discrimination rule; and an antitrust and consumer protection class action on behalf of merchants who incurred “chargebacks” for payment card fraud.



  • Blackstone Alternative Asset Management (BAAM) in securing a landmark appellate win in the Kentucky Supreme Court concerning a $50 billion derivative claim brought by beneficiaries of Kentucky's public pension fund. The ruling brought the long-running case to a close, with the Kentucky Supreme Court unanimously holding that defined-benefit beneficiaries of the state's pension plans lacked statutory and constitutional standing to bring their claims on behalf of the fund of the Commonwealth. With a number of states contending with underfunded pension plans, the lawsuit has been viewed as a critical test case for whether beneficiaries of underfunded public pension plans may assert claims against third-party asset managers on behalf of those plans, and this decision has significant implications for the future of such claims.
  • Oaktree Capital Management in successfully defeating an appellate challenge at the Fifth Circuit of Oaktree’s summary judgment win in its long-running bankruptcy-related dispute with a Taiwanese shipping magnate. The decision upheld Oaktree’s counterclaims seeking to enforce the shipping magnate’s guarantee in connection with loans that financed the purchase of shipping vessels.



  • Oak Hill Capital Partners and individual directors of in securing the dismissal of all claims at trial in the Delaware Court of Chancery regarding Oak Hill's redemption of preferred equity in its portfolio company. The court found that defendants proved at trial that their conduct was entirely fair under Delaware’s most exacting standard of review—an exceedingly rare outcome.



  • Pfizer in multiple complex litigation matters, including the favorable settlement of a high-stakes class action filed by direct purchasers of pain management drug Celebrex who alleged that Pfizer obtained a reissue patent for Celebrex through fraud on the PTO, delaying generic competition and allowing the company to maintain an illegal monopoly;



  • Tesla's independent directors in the favorable settlement of an SEC investigation into Elon Musk’s proposal to take Tesla private and Musk’s public statements and tweets.



  • Morgan Stanley in multidistrict litigation regarding allegations that primary dealers in the auction market for debt instruments issued by the U.S. treasury conspired to rig auctions and manipulate the pricing of Treasury bills, notes, bonds, derivative products and secondary market trading. Paul, Weiss was selected by all 26 defendants—each separately represented by a major law firm—to serve on the defense steering committee and to liaise with the plaintiffs and the court.



  • Fresenius, a German healthcare company, in a landmark ruling, affirmed by the Delaware Supreme Court, that Fresenius was justified in terminating a $4.8 billion merger agreement with Akorn due to Akorn’s post-signing decline and blatant breaches of FDA data integrity requirements, both constituting Material Adverse Events (MAE) under Delaware law.



  • Channel Medsystems, a medical device start-up, in a trial victory in connection with a “material adverse change” litigation in Delaware Court of Chancery in which Boston Scientific unsuccessfully sought to terminate its $250 million acquisition of the company.



  • Cumulus Media, the nation’s second largest radio station operator, in a multi-day chapter 11 plan confirmation trial in which creditors unsuccessfully challenged Cumulus’ valuation of the company’s assets.



  • Farelogix, an information technology company that connects travel agencies directly with airlines and travel services, as lead antitrust counsel in connection with the DOJ’s investigation and subsequent civil antitrust lawsuit seeking to block its proposed acquisition by Sabre, a leading global travel distribution intermediary between ticket agents and airlines and travel services, alleging that the merger would eliminate competition for booking services in the online and traditional travel agency markets. Following a two-week bench trial in federal court, the court issued an opinion in favor of Farelogix, ruling that the DOJ did not establish harm to competition on both sides of the two-sided market.



  • Glencore International in securing the dismissal, currently on appeal, of a multibillion-dollar antitrust, fraud and corruption lawsuit brought against international oil trading companies by a U.S. litigation trust allegedly established by Venezuela’s national oil company, Petroleos de Venezuela, S.A. (PDVSA), alleging that the oil trading companies conspired to obtain inside information about tenders for the sale and purchase of oil and oil products.



  • Twitter in the successful defense of litigation brought by BlackBerry alleging infringement of seven patents related to various aspects of mobile advertisements and messaging interfaces. After filing IPR petitions at the PTAB challenging the validity of two of the seven patents asserted by Blackberry and securing dismissal at the district court as to four of the seven patents asserted, the parties reached a court-approved settlement.



  • Amgen, a leading biotechnology company, as trial counsel in multiple ground-breaking biosimilar litigations, including the first two challenges to the Biologics Price Competition and Innovation Act (BPCIA) and additional lawsuits regarding biosimilar versions of Amgen’s blockbuster products NEULASTA® and NEUPOGENE®.



  • Signature Bank in the dismissal with prejudice of a putative class action brought on behalf of accountants and other purported “agents” of Paycheck Protection Program (PPP) borrowers who claimed they assisted borrowers in preparing their PPP loan applications seeking to recover “agent fees” for PPP loans under the Federal Coronavirus Aid, Relief, and Economic Security (CARES) Act.



  • Simon Property Group in securing the dismissal of all claims at the trial level and on appeal before the New York Appellate Division, First Department of a judgment enforcement proceeding brought by Gronich, a commercial real estate broker, regarding an alleged unpaid commission arising out of an agreement between Longstreet LP, the then-owner of the General Motors Building on Fifth Avenue, and Gronich. Gronich alleged that Simon was responsible for the judgment because it fraudulently transferred assets from Longstreet to its parent in connection with Simon’s merger with the parent and was subsequently liable for the judgment. 



  • SS&C Technologies, a leading financial technology and services company, in securing summary judgment in a long-running case brought by investors in a defunct hedge fund for which SS&C served as fund administrator alleging that SS&C was liable for a fraud perpetrated by the hedge fund manager.



  • The former Chief Financial Officer of Danske Bank in securing the dismissal of a securities class action alleging that Danske Bank and several executives made false and misleading statements that failed to disclose concerns about Danske Bank’s anti-money laundering practices.



  • Murray Huberfield, the co-founder of Platinum Partners, in winning a major appeal at the Second Circuit when the court vacated and remanded his 30-month sentence and reversed the lower court’s $19 million restitution order against him.



See additional work highlights across a multitude of practice areas, such as:



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