SIX Group Expands Swiss Equity Indices with ESG-Focused SPI ESG 25 and Diversified SMI Equal Weight Benchmark

SIX Group Expands Swiss Equity Indices with ESG-Focused SPI ESG 25 and Diversified SMI Equal Weight Benchmark

(IN BRIEF) SIX Group has introduced two new indices, the SPI ESG 25 and the SMI Equal Weight, to expand its Swiss equity index family and meet rising demand for ESG-focused and alternative weighting strategies. The SPI ESG 25 offers a concentrated portfolio of 25 highly liquid companies selected based on financial and ESG performance, with strict sustainability screening and weighting adjustments tied to ESG ratings. Meanwhile, the SMI Equal Weight reimagines the Swiss Market Index by allocating equal weight to each of its 20 constituents, aiming to reduce concentration risk and improve diversification. The launch reflects SIX’s broader strategy to enhance ESG offerings and provide flexible index solutions for investors, while marking important milestones in its ESG index development and partnership with Inrate.

(PRESS RELEASE) ZURICH, 1-Apr-2026 — /EuropaWire/ — SIX Group has expanded its Swiss equity index lineup with the introduction of two new benchmarks, the SPI ESG 25 and the SMI Equal Weight, broadening its offering with both ESG-focused and alternative weighting strategies tailored to evolving market demand.

The launch addresses growing interest from asset managers, ETF providers and structured product issuers seeking more targeted ESG exposure as well as diversified weighting approaches. The SPI ESG 25 is designed as a concentrated version of the broader SPI ESG Index, selecting 25 highly liquid companies based on a combination of market capitalization, trading activity and ESG Impact Ratings provided by Inrate.

Only companies already included in the SPI ESG Index are eligible, and they must meet strict sustainability criteria, including a minimum ESG Impact Rating of C+, compliance with UN Global Compact principles and OECD guidelines, and limited exposure to controversial sectors such as fossil fuels, tobacco, armaments and gambling. Companies flagged for exclusion by Swiss Association for Responsible Investments are also excluded.

The index applies free-float market capitalization weighting with an ESG-based tilt, while capping the largest four constituents at 9% and all others at 4.5%. It undergoes an annual review each September, with quarterly adjustments to maintain ESG alignment and weighting balance.

Alongside this, SIX has introduced the SMI Equal Weight, offering an alternative view of the Swiss Market Index by assigning each of its 20 constituents an equal 5% weighting. Rebalanced quarterly, this approach is widely recognized for reducing concentration risk and enhancing diversification, while also benefiting from systematic rebalancing effects that can influence performance over time.

Together, the two indices enhance SIX’s portfolio of Swiss equity benchmarks by complementing traditional market-cap-weighted indices and factor-based strategies, while also allowing for customized solutions tailored to investor-specific requirements.

Dr. Christian Bahr, Head Index Services & ESG at SIX Financial Information, noted that the new indices reflect the company’s continued push to deliver flexible, client-oriented index solutions across both domestic and international markets. He added that the launch coincides with key milestones, including five years of SIX Swiss ESG indices, five years of collaboration with Inrate, and the 25th anniversary of Inrate.

About SIX
SIX serves the Swiss and Spanish financial centers and a broad international client base, offering stable and efficient infrastructure services. SIX operates stock exchanges and provides services in post trading, financial information as well as the payments business. The company is owned by its users (about 120 financial institutions). With over 4,300 employees and a presence in 19 countries, SIX generated operating income of CHF 1.7 billion and EBITDA of CHF 460 million in 2025.
www.six-group.com

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SOURCE: SIX Group AG