Denka Seiken Co., Ltd. is a publicly traded biomedical company founded in 1950 with its head office in Tokyo and manufacturing facilities in Niigata, Japan. The company has 341 employees and annual sales of 9.4 billion yen (est. US $78 million). Its business focus is in the manufacturing, marketing, and import/export of: human vaccines and diagnostic reagents for immunolochemistry, clinical chemistry, bacteriology, virology, and food and environmental testing.