The funding round was backed by investors including Greenwood Way Capital, Kelvin Capital, and the Scottish Investment Bank.
"I am pleased to welcome our new investors to NTH at a time when the company is poised for growth. We look forward to an exciting future enabled by the support provided by both existing and new investors in this funding round."
Greenwood Way Capital and 24Haymarket led the financing round to support international expansion and operations.
"We are delighted to raise this additional funding. Due to our over-subscribed investment round earlier this year, we decided to add on a second tranche to accommodate the additional interest. We are currently recruiting and looking at prospective new facilities in the UK and California to support the growth of our commercial and scientific activities."