CALENDAR EFFECTS IN IRAQ STOCK EXCHANGE SECTOR RETURNS

This study investigates seasonal patterns and calendar effects in sector returns using comprehensive data from the Iraq Stock Exchange (ISX), representing the first systematic examination of calendar anomalies in Iraq's frontier financial market. Using daily return data for 57 stocks across six economic sectors from August 2014 to July 2024, we employ dummy variable regression models and sector-specific analysis to examine day-of-the-week effects, month-of-the-year patterns, turn-of-the-month anomalies, and Islamic calendar influences. Our findings reveal significant calendar effects that challenge market efficiency assumptions in this frontier market context. We document a statistically significant Monday effect with mean daily returns of -0.0464% (t = -1.738, p 0.10), representing approximately 117 basis points in negative annualized returns. Most notably, we identify an exceptionally strong December effect with daily returns of 0.1402% (t = 4.043, p 0.001), contributing 354 basis points annually and demonstrating remarkable consistency across all sample years. Conversely, April exhibits significant weakness with mean returns of -0.0883% (t = -2.525, p 0.05). Sector-specific analysis reveals heterogeneous calendar effects, with the banking sector showing the most pronounced sensitivity to temporal patterns, including significant Monday weakness (-0.0821%), strong December performance (0.2156%), and April decline (-0.1234%). Notably absent are traditional January effects and Islamic calendar anomalies, distinguishing Iraq's market from other regional exchanges. The persistence of economically meaningful calendar effects suggests incomplete market efficiency and potential arbitrage opportunities, though practical implementation faces liquidity constraints and transaction costs typical of frontier markets. These findings contribute to understanding calendar anomalies in emerging markets and provide valuable insights for investors and policymakers regarding Iraq's financial market development.