A shariah-compliant fund invests under rules approved and monitored by a specialized shariah board appointed by the fund manager. Compliance is not a marketing label but a certification from that board that the fund's holdings and practices meet the adopted standards.
The main rules: no interest-bearing instruments (no conventional bonds or interest deposits — sukuk and murabaha structures take their place), and screening out specific sectors such as conventional banking, conventional insurance, tobacco, and gambling, plus financial limits on investee companies such as conventional-debt ratios.
When a compliant stock produces incidental non-compliant income (such as minor bank interest in company accounts), that portion is purified — donated to charity under a mechanism set by the shariah board and disclosed in fund reports.
The Saudi fund market is among the world's most mature here, with a large share of offered funds shariah-compliant across every category: equity, money market, sukuk, and REITs. Performance-wise, compliance defines the investable universe — it guarantees neither higher nor lower returns, so the same return, risk, and fee criteria still apply.