Manufacturers scrutinize supply chains for California scope 3 emissions disclosures

California's Climate Corporate Data Accountability Act (SB 253) and Climate-Related Financial Risk Act (SB 261) are moving forward despite legal challenges, establishing the first U.S. laws mandating comprehensive greenhouse gas emissions and climate risk disclosures. Companies with over $1 billion in revenue must begin reporting Scope 1 and 2 emissions by 2026, with complex Scope 3 emissions reporting required by 2027 and third-party assurance by 2030. This regulatory advancement, impacting thousands of companies, signifies a new reality for climate disclosure in the U.S., necessitating significant supply chain collaboration and driving demand for compliance services.

Analysis

California's new climate disclosure laws, SB 253 and SB 261, are set to proceed with implementation after surviving a legal challenge for a preliminary injunction. These regulations establish the first comprehensive mandatory climate reporting framework in the U.S., requiring both public and private companies with over $1 billion in annual revenue to disclose Scope 1 and 2 greenhouse gas (GHG) emissions starting in 2026, and the far more complex Scope 3 emissions by 2027. The broad scope of these laws, impacting thousands of companies due to California's economic significance, creates a de facto national standard in the absence of stalled federal SEC rules. A clear bifurcation in corporate readiness is evident; some firms view this as a competitive advantage and are already investing in compliance, while others face significant operational hurdles. The complexity of tracking Scope 3 emissions across entire value chains is driving demand for specialized carbon accounting software and advisory services from providers like UL Solutions (ULS) and Persefoni. Proactive companies such as Amcor (AMCR) are already undertaking pilot projects to improve supply chain data collection. The laws also mandate third-party assurance of this data starting in 2030, beginning at a "limited" assurance level, which will introduce new, recurring compliance costs and operational processes for affected entities.

Key Decisions for Investors

• Investors should evaluate companies providing carbon accounting software and ESG advisory services, such as UL Solutions (ULS), which are positioned for significant growth from the mandatory compliance demand created by SB 253 and SB 261.
• It is critical to assess the supply chain transparency and Scope 3 reporting readiness of large-cap holdings, as companies unprepared for the 2027 deadline face significant compliance costs and potential reputational risk.
• Consider companies that are proactively investing in supply chain data infrastructure, as their early action in addressing complex Scope 3 emissions may translate into a sustainable competitive advantage and a lower long-term risk profile.
• Anticipate that firms across various sectors with over $1 billion in revenue will incur new, material operating expenses related to data collection and third-party assurance, potentially impacting future margin guidance and capital allocation.