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This study investigates the performance of Bitcoin as a diversifier under different constraining portfolio optimization frameworks. The study employs different constraining optimization frameworks that seek to maximize risk-adjusted returns (Sharpe ratio) of the portfolio by optimizing allocations to each asset class (asset allocation). The performance attributes are evaluated by comparing the portfolios both with and without Bitcoin under frameworks ranging from equal-weighted, risk-parity, and semi-constrained to unconstrained. This study suggests that Bitcoin, due to its exotic nature, unwavering appeal, and unknown set of drivers, could act as a diversifier in normal market conditions, and it might also have some borderline hedge to safe haven properties. The results further suggest that while Bitcoin may be a potential diversifier for a risk-seeking investor, the risk-averse investor must exercise caution by limiting their exposure to Bitcoin in their portfolios, as unnecessary exposure may increase the probability of losses in extreme market conditions.

PurposeThis study examines the impact of oil price volatility on firm profitability. As Shariah-compliant firms operate under restrictions, the study also explores whether oil price volatility affects Shariah-compliant firms differently from their non-Shariah-compliant counterparts.Design/methodology/approachThe study sample includes all non-financial firms listed on Gulf Cooperation Council stock exchanges from 2005 to 2019. In evaluating the oil price volatility–profitability relationship, static (panel fixed effects) and dynamic (system generalised method of moments) models were used.FindingsOil price volatility significantly depresses firm profitability. In addition, Shariah-compliant firms are more significantly affected by oil price volatility than their non-Shariah-compliant peers. The results suggest that high oil price volatility exposes Shariah-compliant firms to higher bankruptcy risk than non-Shariah-compliant firms and that positive and negative oil price shocks have asymmetric effects on firm performance.Research limitations/implicationsThe findings of the paper call for more economic diversification by supporting non-oil sectors in the region and raise the need for more development of Islam-compliant products that compete with traditional instruments to help Shariah-compliant firms cope with uncertainty. Moreover, managers need to prepare quick alert and response procedures to reduce the negative impacts of oil price volatility on profitability.Originality/valueTo the best of the authors’ knowledge, this study is the first to explore the relationship between oil price volatility and profitability of non-financial firms. Further, the study extends prior Islamic corporate finance literature by enhancing the understanding of how Islamic corporate decisions affect firm performance during instability.