Islamic index evolution: Lower tracking error and benchmark alignment take priority

Islamic equity benchmarks were historically defined by exclusion. Screening out prohibited business activities and applying financial ratio filters often resulted in narrower universes and meaningful divergence from conventional parent indices.

For allocators integrating Islamic strategies into diversified portfolios, that difference in tracking results in errors that directly affect benchmark alignment and risk management.
“Removing conventional finance and applying financial ratio screens leads to sector biases. That’s a natural outcome of the methodology rather than a conscious sector call,” said Invesco Head of EMEA ETF ESG Product Management, Sam Whitehead.

He noted that Shariah screening also limits exposure to highly leveraged companies – creating structural tilts, most notably toward technology and healthcare. “The key is how tightly you can manage that relative to the broader market.”

Demand for globally diversified exposures is accelerating. Core all-world equity exposures attracted US$27 billion of inflows within the UCITS ETF segment in 2025, ranking among the fastest-growing equity categories. Islamic equity ETFs also recorded inflows, reflecting institutional adoption and growing interest in diversified, rules-based strategies, said Sam.

Benchmark breadth has become a central consideration. Developed-market indices typically include around 1,300 companies, while global all-country benchmarks cover closer to 2,500. A lthough Shariah screening reduces that universe, starting from a broader global base improves diversification and reduces concentration risk compared with developed-only approaches.

Geographic demand patterns reflect the institutional roots of the segment. Early interest for Invesco’s latest offering has been strongest among Middle Eastern investors and European wealth hubs such as Switzerland .

Emerging markets are playing an increasingly important role in that transition. After years of developed-market dominance, emerging markets outperformed in 2025 and have maintained relative strength into 2026, explained Sam. Their inclusion expands the investable universe and enhances diversification, reinforcing the case for global Islamic benchmarks as core portfolio components.

Index methodology evolution has also improved benchmark alignment. Using market capitalization rather than total assets in financial ratio screening allows a broader set of companies to remain eligible, reducing unintended exclusions. This results in lower tracking error and closer performance alignment with parent indices, an important consideration for institutional investors benchmarking against conventional global equities.

Leverage screens also affect capital-intensive sectors such as utilities and communications. Technology and healthcare consequently represent larger index weights. These biases reflect compliance requirements rather than active sector positioning.

Despite these constraints, benchmark construction has become more efficient. Broader starting universes and refined screening methodologies have improved diversification and reduced concentration , allowing Shariah compliant strategies to align more closely with conventional portfolio frameworks while maintaining compliance.

In this context, Invesco’s recently launched Shariah compliant all-world UCITS ETF combines developed and emerging markets in a single structure, an offering not currently replicated by competitors.