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Yvette Ostolaza

Sidley Austin LLP | Dallas, Texas, United States

A lawyer since 1993


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Sidley Austin LLP
2021 Mckinney Ave Ste 2000, Dallas, Texas, United States 75201-7830
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YVETTE OSTOLAZA is Sidley’s Management Committee Chair and an Executive Committee member. Yvette is one of the world’s foremost business litigators, delivering winning results for clients at each stage of complex multijurisdictional commercial disputes and corporate investigations. Her litigation work and ability to solve her clients’ most difficult litigation problems have garnered her numerous accolades and recognitions, including a Band 1 ranking in Chambers USA Texas Litigation: General Commercial and “National Commercial Litigation Star” recognition in Benchmark Litigation.

Yvette is admitted in New York and Texas and litigates trial and appellate matters in U.S. state and federal courts on behalf of global clients. She has significant experience in MDL, crisis management, activist defense, bankruptcy, arbitration, and securities litigation cases. She coordinates and tries proceedings in a variety of arbitration venues, serves on the Roster of Neutral Arbitrators for the AAA for commercial litigation matters, and sits on both the CPR Board of Directors and CPR Panel of Distinguished Neutrals as an arbitrator for the International Institute for Conflict Prevention & Resolution. She served as the vice chair, Ethics and Investigations Subcommittee of the ABA Corporate Governance Committee.

Yvette is highly experienced in providing on-point guidance to boards and senior-level executives during periods of corporate turbulence. Chambers Crisis & Risk Management recognized Yvette as a leader of the firm’s Band 1 Nationwide USA Crisis Management practice and as one of a very small number of notable practitioners nationwide in the area of crisis management. She routinely leads complex internal investigations on behalf of companies, board committees and individual directors, and she defends companies/directors in shareholder and securities class actions. Yvette currently serves on the Board of Directors of Lions Gate Entertainment Inc. and has served on several nonprofit boards, as well as the Board of Directors of the State Bar of Texas.


Yvette’s practice range, experience, and results have earned her extensive recognition. Yvette has been named one of the “Top 250 Women in Litigation” in the United States by Benchmark Litigation since 2012. In 2022 and 2023, Yvette was shortlisted for the “Litigator of the Year” award by Women in Business Law Americas, that celebrates women lawyers who have developed strong and innovative practices. From 2009–2023, Yvette has been among the highest-ranked Texas lawyers in Litigation: General Commercial by Chambers USA. In the 2023 edition of Chambers USA, clients praised her as a “very strategic mind” and note that “her ability to strategize the context of a case is uncanny. She can see around corners that nobody has seen yet.” In the 2021 edition, one client described her as “a tremendous asset to have on your side and a natural leader who has the ability to manage all the moving parts of a team.” In 2020, the publication noted that clients call her “a force of nature” with “every arrow in her quiver that you would want,” who “doesn’t look for the usual cookie-cutter, classic legal responses,” who has particular “expertise in whistleblower and investigation matters,” and is “so dynamic, her command of a room and her ability to get what she needs for a client is unmatched.” In 2019, an enthusiastic client told Chambers USA: “She could seriously convince you that the sky is purple; she’s that good an advocate.”

In 2024, Yvette was named to CNBC’s inaugural list of 50 “Changemakers: Women Transforming Business” and Forbes’ inaugural “America’s Top 200 Lawyers” list. In 2023, the American Bar Association awarded Yvette the “Margaret Brent Women Lawyers of Achievement Award,” which recognizes “female lawyers who have excelled in their field and paved the way for other women.” Yvette also received the National Association of Women Lawyers’ 2023 “M. Ashley Dickerson Diversity Award,” which recognizes “her commitment to forging a path to leadership for women and diverse attorneys to follow.” She was honored by the Hispanic National Bar Association in 2022 with the “Mari Carmen Aponte Award.” Yvette is only the second recipient of this award, which recognizes a “Latina lawyer who is the first to break a glass ceiling.” The Hispanic National Bar Foundation also honored Yvette with the 2022 “Firm Leadership Award.” This annual award recognized her for her “outstanding achievement and her commitment to diversity, equity and inclusion.” The Minority Corporate Counsel Association (MCCA) named Yvette to the 2023 class of “Rainmakers,” which honors diverse lawyers who have “achieved success through innovative, consistent, and proactive business development.”

Yvette has also been recognized by multiple national and regional publications. Recently, Women of ALPFA named Yvette to the 2023 “Most Powerful Latinas” list as a Corporate Trailblazer. In 2021, Latino Corporate Directors Association recognized Yvette as a “Most influential Latina,” The American Lawyer recognized Yvette as a “South Trailblazer,” and BTI Consulting recognized her as a “Client Service All-Star” based on feedback from top legal in-house counsel. Yvette was selected as one of D Magazine’s “Best Lawyers in Dallas” 2016–22 in the Business/Commercial Litigation category, 2018 in the Security Litigation/Enforcement category; she was featured on D CEO’s “Dallas 500” list from 2015–24. She was named to the 2020 and 2021 “Texas Trailblazers” list by Texas Lawyer, as well as the 2020 edition of The Best Lawyers in America. Yvette received the 2015 Texas Lawyer “Lifetime Achievement Award” and the “Thought Leadership” award from Corporate Counsel and Inside Counsel’s 2019 Women, Influence & Power in Law Awards. In 2013, she was named a “Rainmaker” by Diversity and The Bar magazine and honored in 2012 as one of the 20 “Most Powerful and Influential Women” in Texas by the Texas Diversity Council. Yvette has been recognized as one of “America’s Top 100 High Stakes Litigators”; she was listed in the inaugural Benchmark Labor & Employment guide in 2018 and was named a “National Practice Area Star” and a “Litigation Star” in both Commercial and Labor and Employment in Benchmark Litigation from 2021–24. She has also been selected as one of 20 “Women of Excellence” honored nationwide by Hispanic Business magazine. Yvette has been selected to appear in Latino Leaders magazine as a “Top Latino Lawyer” from 2018–23 and has been named to the “100 Latinas” list in 2021–23. In 2024, Yvette was named a “Stand-out Lawyer” by Thomson Reuters. She has also been listed in Texas Super Lawyers for her work in securities litigation from 2005–2024.

Specific Recent Experience

Yvette’s significant experience managing multijurisdictional disputes — including class actions, business tort, securities/shareholder, consumer fraud, financial services, constitutional, contract, employment, fiduciary duty, advertising/sweepstakes, insurance, fraud, good faith and accounting malpractice litigation, arbitrations, simulations, and mediations — leads her to the top. Other aspects of her practice include counseling clients on reducing risks from consumer and advertising-related claims and representing clients in negotiations with state agencies on such claims, as well as advising private equity firms on litigation risks facing their portfolio companies. She is involved in the coordination and argument of appeals in courts across the United States, which includes the U.S. Supreme Court, the United States Court of Appeals, the Texas Supreme Court, and the Fifth District Court of Appeals in Dallas.

Her clients include significant companies in the aviation, retail, hospitality, financial/insurance, energy, and manufacturing industries. These include Aspen Insurance, Arca Continental, MGM Resorts, Celanese, Chuck E. Cheese Entertainment, Tuesday Morning Corporation, EnLink Midstream, Neiman Marcus, SM Energy, Sally Beauty, HMS Holdings, Michaels, Best Buy, Forterra, SAExploration, JPMorgan, McAfee, Inc., Darling Ingredients, Vistra Energy, Hunt Oil, Coca-Cola Southwest Beverages, Flexi-Van, Kiromic, Forescout Technologies, and Peru LNG.

Yvette is often called on to represent these clients in their most important litigation matters. She is highly experienced in all aspects of litigation and trial work and often leads teams of lawyers handling large-scale and high-profile litigation. Recent representative matters include the following:

  • Represented an energy company in a high-stakes and confidential natural gas arbitration related to a complex oil and gas pipeline.

  • Represents Sally Beauty Supply LLC in a multi-district litigation brought by hundreds of plaintiffs from across the country. Plaintiffs are alleging bodily harm caused by the extended use of hair relaxer products.

  • Leading a multistate team of litigators representing Aspen Insurance in COVID-19 business interruption coverage litigation involving over 40 state and federal lawsuits in Florida, Illinois, Texas, Washington, Kansas, New York, and Missouri and putative class actions. In several of these cases, the courts have granted Aspen’s dispositive motions. Yvette’s work on these cases has produced several nationwide dismissals and recognition by The American Lawyer four times.

  • Successfully represented Neiman Marcus Group in a high-profile data privacy and wiretapping class action. After successful defense motions, the plaintiff voluntarily dismissed the case with minimal disruption to Neiman Marcus. Yvette’s work on this case resulted in recognition by The American Lawyer.

  • Led a multipractice team of lawyers defending SAExploration in a series of civil, criminal, and regulatory complaints and investigations. Coordinated very favorable settlements with regulators and civil plaintiffs.

  • Led a team representing Texas Pacific Land Trust in a high-profile litigation against a group of dissident shareholders in the largest board proxy contest of the 2019 proxy season. The litigation was settled favorably and featured in the International Herald Tribune.

  • Represented Forescout Technologies in a successful arbitration resulting in the court granting a TRO request related to a breach-of-separation agreement with a former senior executive.

  • Obtained a complete dismissal of a lawsuit on behalf of Apache IS brought by a former employee.

  • Represented Forterra, Inc. in the successful resolution of a securities class action in which the plaintiffs sought US$250 million in damages but settled for US$5.5 million (including attorneys’ fees). The securities class action was significant because it is one of a handful of Section 11 cases filed in Texas.

  • Obtained a complete victory in a securities case that stemmed from an oil spill in California involving a pipeline owned and operated by Plains All American Pipeline. The team represented 37 investment banks who acted as underwriters for various securities offerings.

  • Represented the Navigators Group., Inc. in relation to alleged violations of Section 14(a) and 20(a) of the Securities Exchange Act of 1934 in connection with a proxy statement detailing The Hartford Financial Services Group Inc.’s US$2.1 billion acquisition of the company. Sidley was able to get a favorable resolution with no payment by the client.

  • Represented a client in a shareholder derivative action claims of breach of fiduciary duty, unjust enrichment, waste of corporate assets, and violations of Section 15(a) of the Securities Exchange Act of 1934.

  • Led a team advising a company providing sterilization services to the healthcare and food industries. The representation included providing strategic crisis management support, preparing toxic tort and environmental litigation defense strategy, and regulatory counseling.

  • Provided counseling and advice regarding business operations in response to the various government stay-at-home and business closure orders issued in response to the COVID-19 crisis to various companies. Advice included regulatory compliance, FDA, and labor and employment matters.

In addition, a significant portion of Yvette’s practice involves counseling boards, special committees, and directors on sensitive internal investigations including with respect to whistleblower, accounting, and executive issues. Her experience advising boards and conducting investigations includes:

  • Representing a major biopharmaceutical company before the Securities and Exchange Commission (SEC) as part of a voluntary self-disclosure of findings stemming from a prior internal investigation. The prior investigation resulted in the filing of corrective securities disclosures and changes in company executive management and board leadership. Sidley is also representing the company in various shareholder litigation suits related to the findings of the prior internal investigation.

  • Represented the special committee of Best Buy. At the conclusion of the investigation, Best Buy was sufficiently confident in the work and announced public support for the CEO.

  • Advising and assisting in a confidential investigation, by the audit committee of a holdings corporation, of allegations made by a senior manager of financial accounting who, when being terminated, reported a series of alleged accounting-related errors. Sidley provided strategic support and counsel as the company approached imminent periodic report-filing deadlines, and it investigated the company’s accounting practices at the direction of its audit committee to test the veracity of the terminated employee’s allegations.

  • Leading an internal investigation into certain harassment and related allegations made by certain client distributors against another client distributor, and providing legal advice in connection with the internal investigation.

  • Representing an energy company in connection with an investigation by the Office of the Illinois Attorney General concerning alleged deceptive marketing practices in the sale of retail electricity supply in the State of Illinois.

  • Representing a multibillion dollar cybersecurity company in an internal investigation related to alleged vendor fraud and employee misconduct.

  • National manufacturer in an investigation involving reporting practices.

  • Fortune 200 company in an internal investigation involving certain claims processing.

  • Numerous internal investigations involving whistleblower, accounting, and executive issues.

  • Special committees of two nonprofit organizations involving board or senior management alleged misconduct.

  • Special committees of five different companies in connection with restatements, including companies in the financial services and energy industries.

  • Special committee of life sciences company involving FDA disclosure issues.

  • Special and audit committees on investigations involving #me-too allegations against c-suite and board members.

  • Audit committees and boards on an investigation involving FCPA claims.

  • Special committee of the board of Restoration Hardware with respect to an internal investigation of a whistleblower’s allegations concerning the company’s former CEO.

  • Special committee of the board of Southwest Airlines Co. with respect to an independent investigation into various FAA issues.

  • National Public Radio with respect to its internal review into the firing of Juan Williams following his controversial on-air remarks, the results of which were covered by the national news media.

  • Special committee and conducting an investigation on behalf of an international energy company on FCPA issues.

  • Special committee of the board of a recruiting firm with respect to an investigation of employment discrimination allegations.

  • Special committee of a retailer with respect to historic equity-granting practices.

  • Special committees of professional services firms in two investigations involving senior management and discrimination.

  • Fortune 50 retailer in confidential internal investigation involving an executive.

  • A life insurance company regarding allegations related to management misconduct.

  • Assisted board in drafting legislative amendments related to congressional efforts to address COVID-19.

Community Involvement

Yvette is also recognized for her community involvement in charitable activities. In 2023, Yvette has been elected to serve on the Orange Bowl Committee. Orange Bowl Cares’ programs include Youth Sports, Education, Community Engagement, and Legacy Programs, which culminate in the Capital One Orange Bowl. Yvette began serving as a member on the University of Miami School of Law Dean’s Advisory Committee in 2023. She is also an adjunct professor of law at the University of Miami School of Law, where she teaches a course on investigations. In 2016, Yvette was named a recipient of the Girls Inc. “Women of Achievement” award. She has received the prestigious Dallas ADL Larry Schoenbrun Jurisprudence Award for her outstanding leadership and exemplary contributions to the community. She serves on the board of the AT&T Performing Arts and Dallas Theater Center.

Recently, The Center for American and International Law recognized Yvette as a Patrick E. Higginbotham Inn of Court “Master,” its highest designation. The Inns of Court Foundation is made up of both judges and lawyers and promotes competence, collegiality, integrity, and education in litigation practice.

*Admitted to practice only in New York and Texas. Not admitted to practice in Florida.


Sidley Austin LLP, Chair Management Committee
No publication information available.
No award information available.