Workplace stress is a common issue that can cause a range of debilitating health outcomes including depression, anxiety, cardiovascular diseases, musculoskeletal problems, or alcohol dependence of workers affecting their satisfaction, work efficiency and productivity. It was hypothesized that exposure to green spaces can reduce stress levels leading to workplace satisfaction due to the restorative effects of Nature. Literature establishes that a regular touch with Nature is required to reduce workplace stress while maintaining a balanced mental health. This field investigation tested stress levels after Exposure to Nature as a strategy to reduce stress at the workplace. It employed a case study method selecting three software companies in Sri Lanka. C1, C2, C3 were selected based on the existing levels of greenery with high, moderate, and low density of greenery, respectively. An online questionnaire survey was conducted with three volunteer groups of employees to test the level of Nature-contact, perceived stress, and satisfaction of employees. The study revealed a direct association between the density of greenery vs stress levels and satisfaction of employees. Respondents of C1 were less stressed (88%) and more satisfied (80%) with their job compared to the other two cases. Respondents of C3 were the most stressed (57%) and least satisfied (71%). 94% out of the total respondents perceived that exposure to green spaces increased perceived work efficiency via maintaining mental health (27% agreed, 67% strongly agreed). The study recommends increasing the level of exposure to Nature to boost satisfaction and work efficiency of employees in companies of Sri Lanka.