CSO headcount at US companies falls for first time in 15 years

illuminem summarises for you the essential news of the day, reviewed by our editorial team. Read the full piece on Trellis or enjoy below:

🗞️ Driving the news: For the first time in 15 years, the number of chief sustainability officers (CSOs) at publicly listed U.S. companies has fallen, declining 10% from 216 in 2025 to 193 as of July 1, 2026
• The drop is mainly due to vacant CSO roles not being filled, as companies merge sustainability responsibilities into broader business functions

🔭 The context: CSO headcount had surged in the early 2020s following slow growth in the 2010s, reflecting increased corporate focus on climate and ESG
• The recent decline may partially signal a “sustainability recession,” influenced by political pushback against ESG initiatives
• However, some companies are retaining sustainability functions within other roles, operationalizing climate efforts rather than cutting them outright

🌍 Why it matters for the planet: Fewer dedicated CSOs could slow corporate action on emissions, ESG compliance, and climate risk management
• Integrating sustainability into broader business functions may help maintain progress, but the lack of dedicated leadership could reduce accountability and strategic focus

⏭️ What’s next: Companies may continue to embed sustainability responsibilities across operations, balancing cost and impact
• Monitoring whether operational integration achieves the same climate outcomes as dedicated CSO leadership would be critical over the next few years

💬 One quote: “CSOs have taken on additional responsibility and while ‘sustainability’ has been dropped from their job title it remains part of their remit.” — Ellen Weinreb, Weinreb Group

📈 One stat: 193 U.S. companies currently have CSO roles, down 10% from 216 in 2025

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