This study examined the relationship between employee emotional stability and corporate productivity of selected oil and gas firms in Rivers State. Self-awareness and self-management were used as dimensions of emotional intelligence while market share and effectiveness are used as measures of corporate productivity. Self-efficacy theory was used as the theoretical formulation for the study. Using survey research design a target population of 4104 workers of Nigeria Agip Oil Company and Nigeria liquefied Natural Gas (NLNG) Ltd, Port Harcourt and a sample size of 353 was determined from the population using Cochran’s sample size formula for finite population. Well-structured questionnaire was designed and used to obtain responses from the respondents. Regression analysis using SPSS version 24.0 was employed to test the hypotheses at 0.05 level of significance. Findings from the study established that self-awareness and self-management enhance productivity of a firm through improved market share and operational effectiveness. Hence, organisations should be resolute in observing the culture of establishing the sound emotional stability of their employees. This will enable the organisation to achieve sustainability in employees’ achievement of a given task.