Alrayes joined Alistithmar Capital in his current position in 2018. Founded in 2007, Alistithmar Capital is a wholly owned subsidiary of the Saudi Investment Bank (SAIB). The firm had $10.8 billion in assets under management in 2025. That year, Alistithmar Capital deployed around $1.3 billion across commercial, hospitality, office, and residential transactions. In November 2025, the company also launched two residential real estate funds valued at $175 million and $288 million. Alrayes also serves on the boards of Amlak International Finance Company and Dallah Healthcare.