In food industry, extended portfolio of the products drove the M&A activities over the past year. However, in regard to the M&A activities, customer's responses varied from positive to negative. This became important factor that the new company had to consider. This study measured customer satisfaction through service quality in post M&A situation in food ingredient industry and gave insight for the corporate to determine path forward. Integrated product portfolio benefits were used as moderating role in the impact of service quality on customer satisfaction. Previous post M&A studies did not measure specifically integrated product portfolio as value to strengthen or weaken customer satisfaction especially in B2B business. R&D in food and beverage manufacturing who were the customers of a global food ingredient company having M&A in 2021 located in Indonesia were used as respondent in this study and used a questionnaire survey spread to respondents. The data were processed with the statistical package for the social sciences (SPSS) and the partial least square structural equation model (PLS-SEM). The test's findings demonstrated that customers were satisfied regarding the merger measured by one-sample t-test. Service quality positively impacted customer satisfaction in post M&A situation. However, it was discovered that integrated product portfolio benefit had no moderating effect on the impact service quality on customer satisfaction post M&A situation. Integrated product portfolio affected customer satisfaction directly instead and became independent variable. SOme research's implications were that it was critical for food ingredient company to maintain service quality in post M&A situation and additional portfolio was to be used as value added to improve customer satisfaction.