Unknown Author
January 23, 2026
Sidley Ranked No. 1 for Shareholder Activism Defense in H1 2025 by FactSet and LSEG

2 min
AI-made summary
- Sidley has been ranked as the No
- 1 legal adviser for company defense in U.S
- activism and defense league tables by FactSet and The London Stock Exchange Group (LSEG) for the first half of 2025, with 24 and 33 campaigns credited respectively
- The firm also received top rankings from Bloomberg, Chambers USA, and Legal 500
- Since 2020, Sidley has led shareholder activism defense league tables and has represented companies in approximately 150 proxy contests and several hundred activist campaigns.
FactSet ranked Sidley as the No. 1 legal adviser for company defense in its U.S. activism and defense league tables for the first half of 2025. FactSet credited Sidley with 24 campaigns. Sidley also ranked as the No. 1 company-side legal adviser in The London Stock Exchange Group (LSEG) shareholder activism league tables for the first half of 2025. LSEG credited Sidley with 33 campaigns. The FactSet and LSEG rankings follow Sidley’s No. 1 ranking by Bloomberg in the first half of 2025, along with Sidley’s Band 1 ranking in Chambers USA in Corporate/M&A: Takeover Defense, stating that “Sidley Austin is the best in the business at activism defense work.” Similarly, Legal 500 has ranked Sidley in Tier 1 for Shareholder Activism – Advice to Boards, calling Sidley’s activism co-chairs Kai Haakon E. Liekefett and Derek Zaba “two of the best lawyers in America.” Sidley has been ranked No. 1 in the shareholder activism defense league tables by Bloomberg, FactSet, Diligent, and LSEG for company-side engagements since 2020. In the past five years, Sidley has represented companies in approximately 150 proxy contests, several hundred activist campaigns, and dozens of settlements — more than any other legal defense practice in the world.~~FactSet ranked Sidley as the No. 1 legal adviser for company defense in its U.S. activism and defense league tables for the first half of 2025. FactSet credited Sidley with 24 campaigns. Sidley also ranked as the No. 1 company-side legal adviser in The London Stock Exchange Group (LSEG) shareholder activism league tables for the first half of 2025. LSEG credited Sidley with 33 campaigns. The FactSet and LSEG rankings follow Sidley’s No. 1 ranking by Bloomberg in the first half of 2025, along with Sidley’s Band 1 ranking in Chambers USA in Corporate/M&A: Takeover Defense, stating that “Sidley Austin is the best in the business at activism defense work.” Similarly, Legal 500 has ranked Sidley in Tier 1 for Shareholder Activism – Advice to Boards, calling Sidley’s activism co-chairs Kai Haakon E. Liekefett and Derek Zaba “two of the best lawyers in America.” Sidley has been ranked No. 1 in the shareholder activism defense league tables by Bloomberg, FactSet, Diligent, and LSEG for company-side engagements since 2020. In the past five years, Sidley has represented companies in approximately 150 proxy contests, several hundred activist campaigns, and dozens of settlements — more than any other legal defense practice in the world.
Article Author
Unknown Author
The Sponsor
