OBS Ingredients obs,obs ingredients,obs ingredient,ong boon seng,obs ingredients Pte Ltd OBS Ingredients Pte Ltd, a wholly own subsidiary of Ong Boon Seng Pte Ltd (established since 1939) in Singapore, is a supplier of value add ingredients to the food industry. Over the years the company has been active as a food ingredients and solutions provider to various bakery, foodservice and food & beverage retailers and manufacturers in Singapore and the region.