Gibson Dunn advised Catchment Capital, a private equity firm focused on transforming middle market industrial businesses, on its acquisition of Isolatek, a leading manufacturer and supplier of passive fireproofing technologies, from SK Capital.

The Gibson Dunn corporate team was led by partner Alexander Fine and included associates Jonathan Abrams, Michael Naclerio, and Ethan Anderson. Partner Matt Donnelly and associate Elizabeth Johnson advised tax aspects; partner Michael Collins advised on benefits; partner Dean Masuda and associates Catie Sakurai and Nicole Kim advised on financing; partner Meghan Hungate and associate Andrew Hartman advised on IP aspects; partner Michael Murphy advised on environmental aspects; partner Josh Lipton and associate Alex Merritt advised antitrust aspects; and partner Christopher Timura advised on international trade aspects.

A Gibson Dunn team secured a significant win for NBCUniversal to dismiss in full Sean “Diddy” Combs’ $100 million defamation claim related to the documentary “Diddy: The Making of a Bad Boy.” The case is Sean Combs v. NBCUniversal Media et al. [PDF] in the New York Supreme Court.

The firm’s winning team includes partners Theodore J. Boutrous Jr., Connor Sullivan, and Katie Townsend and associates Zachary Freund, Connor Mui, and Elise Blegen.

Partner Allyson Ho has been nominated for North America Constitutional Lawyer of the Year by the IFLR Women in Business Law Americas Awards.

Now in their 15th year, the awards celebrate “trailblazing” women who are breaking new ground in their areas of expertise in the legal sector. Allyson is honored to be named alongside Karen Dunn, Roberta Kaplan, and Lisa Blatt.

Allyson is Co-Chair of the firm’s Appellate and Constitutional Law Practice Group. She has presented over 100 oral arguments in federal and state courts nationwide, including multiple high-stakes business cases before the U.S. Supreme Court.

The Women in Business Law Americas Awards winners will be announced on May 28 in New York.

Gibson Dunn’s market-leading Business Restructuring & Reorganization practice led all law firms in creditor side engagements in the first quarter of 2026, with 15 mandates, according to Octus’s most recent Americas Restructuring Rankings.

Partner Mylan Denerstein has been named by Crain’s New York Business [subscription required] to its list of Women of Influence for 2026: leaders who “are igniting change” and “reshaping how the city is powered … while elevating their peers.”

Speaking with Crain’s, Mylan discussed how acting under the principles of respectfulness and authenticity has helped in her career.

“You can get so much from being friendly — they’ll tell you more that might help you, and you’ll learn all sorts of things, like what they really want,” Mylan said. “But because I’m friendly does not mean you’re going to be able to walk all over me. Because I try to take time to understand what a regulator or opponent wants to achieve while also understanding my client’s objectives, I am able to drive results.”

Mylan said that a career highlight was crafting marriage equality legislation in New York while serving as counsel to former Governor Andrew Cuomo.

“There was fervent opposition, fervent support and it was constant — as this was all pre-COVID, and everybody was in the capital all the time — and that experience really changed my life,” Mylan said. “I realized you could really make positive changes for people.”

Mylan is Co-Chair of Gibson Dunn’s Public Policy Practice Group, Co-Partner in Charge of the New York office, a member of the Executive Committee, and a leader of the firm’s Diversity, Equity and Inclusion Task Force. She leads complex litigation and internal investigations, representing companies confronting a wide range of legal issues in their most critical times. Since January 2022, Mylan has served as the court-appointed New York Police Department Monitor responsible for overseeing the implementation of court-ordered reforms.

Gibson Dunn announced today that a four-partner team of leading appellate and strategic litigators has joined the firm, reinforcing its position as the nation’s preeminent destination for litigation talent. Former Acting Solicitor General Jeff Wall will serve as Co-Chair of the firm’s Appellate and Constitutional Law Practice, building on its exceptional record in handling the most challenging appeals and legal issues. He is joined by premier litigators Morgan Ratner and Judson (Judd) Littleton in Washington, D.C., and Yaira Dubin in New York.

“Jeff, Morgan, Judd, and Yaira are among the country’s most respected appellate advocates, with an extraordinary record in high-stakes cases,” said Barbara Becker, Chair and Managing Partner of Gibson Dunn. “Their arrival represents a powerful addition to our litigation platform, further strengthening our ability to lead clients through their most consequential matters.”

Jeff, Morgan, and Yaira have together argued more than 45 cases before the U.S. Supreme Court. The team brings deep experience at the highest levels of appellate advocacy, including in the Office of the Solicitor General. Jeff served two stints at the Office, most recently as Acting Solicitor General. Yaira and Morgan served as Assistants to the Solicitor General, and Judd was a Bristow Fellow before serving in the U.S. Department of Justice’s elite Federal Programs Branch. Collectively, they have handled industry-shaping cases across trial and appellate courts nationwide, including high-stakes commercial litigation in federal district courts, challenges to federal agency action, and precedent-shaping cases before the courts of appeals and the Supreme Court. 

“These are some of the most accomplished, well-regarded, and versatile Supreme Court and appellate lawyers in the country, and their arrival is a testament to Gibson Dunn’s position as a litigation powerhouse,” said Thomas Dupree, Co-Chair of the firm’s Appellate and Constitutional Law Practice.

Allyson Ho, Co-Chair of the Appellate and Constitutional Law Practice, added, “We have known and respected this team for years. They are exceptional advocates and trusted advisors, and their addition enhances our ability to deliver the highest level of appellate and Supreme Court representation to our clients.”

“We are thrilled to be joining forces with Gibson Dunn,” said Jeff. “Gibson Dunn is a powerhouse known for its depth of talent, strong culture, and extraordinary client base. Together with the rest of the Gibson Dunn team, we will be unmatched in our ability to help clients navigate their highest-stakes matters.”

Jeff, Judd, Morgan, and Yaira join a deep appellate bench at Gibson Dunn, including 11 lawyers who have argued before the Supreme Court. Their arrival cements the firm’s market-leading position as the go-to platform for appellate advocacy and strategic legal thinking.

Jeff Wall
Jeff has argued more than 30 cases before the Supreme Court and is one of the most in-demand appellate advocates for bet-the-company litigation. Jeff is ranked Band 1 by Chambers USA; The National Law Journal named him “Appellate Attorney of the Year” for 2025; and he has recently been named The American Lawyer’s “Litigator of the Week” three times for a series of groundbreaking wins. Jeff clerked for Justice Clarence Thomas on the Supreme Court and Judge Wilkinson on the U.S. Court of Appeals for the Fourth Circuit.

Yaira Dubin
Yaira will lead Gibson Dunn’s New York appellate practice. Yaira has argued six cases before the Supreme Court, prevailing in major copyright, bankruptcy, and statutory appeals. Clients tap Yaira for their most challenging and cutting-edge legal issues, including in frontier technologies like artificial intelligence and cryptocurrency. Yaira clerked for Justice Elena Kagan on the Supreme Court, Chief Judge Sri Srinivasan on the U.S. Court of Appeals for the D.C. Circuit, and Chief Judge James E. Boasberg on the U.S. District Court for the District of Columbia.

Judd Littleton
Judd is a highly versatile appellate lawyer who has litigated clients’ most pressing and consequential cases at every level of the judiciary. He is a go-to lawyer for challenging burdensome government regulations, having won a series of closely watched cases striking down the FTC’s non-compete and premerger notification rules and multiple rules issued by the SEC and CFPB. Judd clerked for Chief Justice John G. Roberts, Jr. on the Supreme Court and Judge A. Raymond Randolph on the U.S. Court of Appeals for the D.C. Circuit.

Morgan Ratner
Morgan handles high-profile appeals and legal issues, turning complex problems into simple winning points. She has argued 10 cases before the Supreme Court, where she has had an extraordinary record of success. Morgan was The American Lawyer’s “Young Lawyer of the Year” for 2024, and her high-dollar appellate wins have repeatedly racked up “Litigator of the Week” accolades. Morgan clerked for Chief Justice John G. Roberts, Jr. on the Supreme Court, and then-Judge Brett M. Kavanaugh on the U.S. Court of Appeals for the D.C. Circuit.

Partner Helgi Walker and associate Michael Corcoran have published an article in the National Law Journal [PDF] about the landmark Loper Bright Enterprises v. Raimondo administrative law U.S. Supreme Court case. They explain the two must-do steps for any lawyer seeking to challenge agency actions involving supposed delegations of discretionary power: (1) knock out generic grants of authority as conferring no interpretive discretion and (2) ensure that the agency’s regulations are directly linked to terms it has the authority to interpret.

They write that the ruling’s language about delegated discretions “is no shark, but a herring” and that in light of their analysis “agency challengers should be well-equipped to sail across these new seas in the post-Loper Bright world — building on Loper Bright and opening new fronts in challenges to agency actions.”

Gibson Dunn Chair and Managing Partner Barbara Becker reflected on the firm’s continued growth in an interview with The American Lawyer [PDF]. The publication noted rising demand across practice areas, industry groups, and geographies.

“Last year we celebrated our 135th anniversary as a firm, and it took us 121 years to reach $1 billion in revenue,” Barbara said. “Then it took nine years to reach $2 billion, four years to reach $3 billion, and two years to reach $4 billion, so that momentum in and of itself is pretty awesome.”

Following a public consultation, discussed in her previous article, the U.K. Office of Financial Sanctions Implementation (OFSI) enforcement framework is being fundamentally overhauled with major reforms being adopted, writes London associate Irene Polieri for Law360 [PDF].

With the U.S. Department of Treasury’s Office of Foreign Assets Control (OFAC) framework as a reference, Irene looks in detail at the changes — including a new case assessment matrix with higher baseline penalty ranges, the reduced voluntary self-disclosure discount and OFSI’s aims to double maximum penalties — and discusses OFSI’s new approach prioritizing cases of the highest seriousness, supporting specific foreign policy objectives and exposing vulnerabilities in particular sectors.

Irene writes: “The era of OFSI as a passive responder to disclosed breaches is over, and a clearer sense of direction now informs the agency’s operations. While the changes bring OFSI into closer alignment with the U.S. Department of Treasury’s Office of Foreign Assets Control — its U.S. counterpart and formal enforcement partner since 2022 — OFSI has made deliberate choices to diverge, and the two frameworks remain structurally distinct in ways that carry real consequences for exposure modelling and enforcement strategy.”

Partner Karin Portlock was interviewed by KTUL-TV about an amended complaint filed on April 10 in an ongoing federal lawsuit against Tulsa Public Schools. Gibson Dunn brought the case on behalf of the family of a special needs first-grade student who was assaulted in 2024 by a staff member who later pleaded guilty to felony child abuse. According to the amended complaint, the assault was one of several examples of school employees using improper force and violence against disabled students.

“What we’ve uncovered is that the mistreatment of special needs children in Tulsa Public Schools is endemic,” said Karin.

In an in-depth interview with The AmLaw Litigation Daily [PDF] (“Speed by Itself Is Not Enough: How Gibson Dunn’s Trey Cox Thinks AI Is Reshaping Litigation Strategy,” April 14, 2026), partner Trey Cox asserts that the main value of AI is not speed but rather what he refers to as “strategic compression”—the ability to get “to the point of decision-making faster.”

Trey explains that “In complex litigation, trial teams can spend days and weeks and months gathering documents, organizing facts, mapping the factual terrain, the legal standards and pressure-testing things.”  With AI, he says, “we can compress those weeks and months into hours and days.”

Trey adds that this compression isn’t about locking into a theory earlier—it’s about testing it harder, which is what the best trial teams do.  “You should use AI … to test the assumptions, to challenge the facts,” he said. “That’s the magic of what AI allows you to do.”

Trey is Co-Chair of the firm’s global Litigation Practice Group and Co-Partner in Charge of the Dallas office.

A Gibson Dunn team has achieved a significant victory on behalf of Vale S.A.—the world’s largest iron mining company—in a long-running multibillion-dollar securities litigation in the U.S. District Court for the Eastern District of New York.

After pending for nearly two years, Vale’s motion to exclude Dr. Steven Feinstein’s expert damages model in its entirety was granted by Judge Eric Komitee—a pathbreaking ruling that will reverberate far beyond this case. The Court’s decision provides robust guidance on the proper damages methodology experts must employ in event-driven securities class actions involving realization of understated risks. For far too long, securities class action plaintiffs in these cases have sought to “supersize” damage amounts by hiring experts who assume maximum artificial inflation from day one of a class period and then label as “damages” every penny of market losses on alleged corrective disclosure dates. This decision should end that practice once and for all.

Led by Christopher Joralemon and David Kusnetz, the firm’s winning team included Chase Weidner, Andrew Freire, Nicholas Canelos, Jabari Julien, Nathalie Gunasekera, Amanda Bello, Amir Heidari, Simone Rivera, and Carolyn Ye. 

Gibson Dunn advised Apollo-managed funds on the acquisition of Gatehouse Living Group, a vertically integrated U.K. residential investment and management platform.  

The investment will expand upon Apollo’s investment activity in the U.K. housing ecosystem.

Gibson Dunn’s London corporate real estate team was led by partner Patrick Hennessy and included of counsel Sarah Leiper-Jennings and Manjinder Tiwana and associates Bansaree Shah and Carmen Heredia. Partner James Chandler and associate Sarah Johnson advised on tax matters. Associates Georgia Derbyshire and Olivia Sadler advised on employment matters. Partner Alison Beal and associates Libby Pica and Phoebe Rowson-Stevens advised on IP/IT/GDPR matters. Associate Amy Cooke advised on AML/ABC matters.  

Gibson Dunn is advising American Ocean Minerals Corporation on its merger with Odyssey Marine Exploration, Inc. creating a $1 billion U.S.-controlled deep-sea critical minerals platform.

The Gibson Dunn corporate team includes partners John Gaffney and Eric Scarazzo and associate Vlad Zinovyev. Partner Matt Donnelly is advising on tax aspects, and partner Michael Collins is advising on benefits. Partner Andy Chen is advising on financing. Partner Bradley Smith is advising on antitrust aspects. Partner Michael Murphy is advising on environmental aspects. Partner Howard Hogan and associate Ellie Schwietering are advising on IP aspects. Associate Audi Syarief is advising on international trade aspects.

A Wall Street Journal article describing how Hong Kong has flourished as China’s hub for helping Iran survive punishing sanctions, much to the frustration of U.S. officials (“How Hong Kong Helps the Flow of Iran’s Hidden Billions,” April 11, 2026), includes commentary by partner Matt Axelrod.

Matt told the publication that, during the Biden administration, Chinese officials were reluctant to act when materials restricted by U.S. law were shipped through China.  “There was definitely denial of responsibility to take action because it didn’t violate their laws,” he said. “And there was talk about sovereignty and what they viewed as our attempts to impose some sort of extraterritorial restrictions on U.S. items.”

Matt, who co-chairs Gibson Dunn’s Sanctions and Export Enforcement practice group, is a former Assistant Secretary for Export Enforcement at the Bureau of Industry and Security.

Interviewed by Global Investigations Review for its article “BIS on Hiring Spree as Trump Calls for ‘Historic’ Budget Boost” (April 3, 2026), partner Matt Axelrod, former Assistant Secretary for Export Enforcement at the Bureau of Industry and Security, noted that the funding boost and additional hirings will expand the agency’s enforcement capabilities. “The math is pretty simple,” Matt said. “More agents means more investigations, which ultimately means more enforcement actions.”

Gibson Dunn is advising Assertio Holdings on its sale to Garda Therapeutics.

In addition, Gibson Dunn is advising Assertio on its sale of the U.S. sales and distribution rights for a portfolio of seven branded products to Cosette Pharmaceuticals.

Our corporate team includes partners Ryan Murr, Branden Berns, and Evan D’Amico.

Gibson Dunn won five awards at this year’s Managing IP Americas Awards, including Patent Disputes Firm of the Year.

Two Gibson Dunn partners were also honored: Brian Rosenthal as Patent Litigator of the Year (New York) and Daniel Angel as Practitioner of the Year (IP Transactions).

In addition, the firm was recognized for its work on two Impact Cases of the Year: Incyte v. Sun Pharmaceutical (Fed Cir 2025) and Dewberry Group v. Dewberry Engineers (US Supr Ct 2025).

The Managing IP Americas Awards celebrate the achievements of the intellectual property law community in the Americas. The awards were presented in New York on April 9, 2026.

Partner Simon Tysoe shared his insights on the U.K. and global mining M&A landscape with Corporate Financier.

M&A in the mining sector is thriving thanks to gold and silver prices at an all-time high, and minerals such as lithium, copper, and rare earths are vital for electrification, computing and defence systems.

“London remains attractive to mining companies,” said Simon. “The U.K. capital has more liquidity for the larger players than, say, Canada – another major mining market – and it also has investors who feel very comfortable with large, listed entities whose businesses are entirely international, rather than domestic.

“There is a constant debate, with all natural resources, about whether it is better and cheaper to buy or to build. Does it make sense to do greenfield development to increase your production or to buy someone else to get that lift?”

Buy currently has the edge over build and is likely to do so for some time to come, added Simon.

The Original Jurisdiction article “Defense-Focused Biglaw Moves Into Plaintiff-Side Work” (April 9, 2026) featured commentary by partner Robert Weigel. He discussed the increase of plaintiff-side work in recent years: “Plaintiff-side work has added a dimension to big-firm practice that wasn’t there before.”