Jack in the Box Inc. (JACK) operates quick-service restaurants offering burgers, tacos, and other fast food. While primary business activities are Shariah-compliant, severe financial issues including a debt-to-market-cap ratio of 680.99% and interest income ratio of 5.78% result in non-compliance across all major Shariah standards and indices. The company is excluded from S&P, MSCI, FTSE, and DJIM Islamic indices due to riba exposure. Purification of 5.78% is required for dividends, but overall investment is not recommended without significant deleveraging. Investors in its sector should consider compliant alternatives with stronger balance sheets.