Tosoh Bioscience LLC has made an equity investment in Madison pharmaceutical company Semba Biosciences Inc., and has an option to acquire full ownership of the company.

The multimillion-dollar transaction is expected to close Dec. 1 for an undisclosed price. Tosoh Bioscience is a King of Prussia, Pennsylvania-based subsidiary of $7.4 billion Japanese conglomerate Tosoh Corp., which has more than 12,000 employees at its more than 100 companies globally. Tosoh Bioscience supplies liquid chromatography products to laboratories and manufacturing plants.

Semba is a life science company that supplies researchers with instruments, reagents and methods for efficient, scalable purification of biomolecules and chemicals.

Madison-based venture capital management firm Kegonsa Capital Partners is the majority owner of Semba Biosciences, and Tosoh Bioscience now holds the second-largest ownership stake, said Ken Johnson, managing director at Kegonsa.

“It’s a big deal for Wisconsin to bring that big of a player into our community,” Johnson said. Read the full story here.