H.I.G. Capital has used its H.I.G. Growth Partners arm to make a growth investment in AdTheorent, a provider of digital advertising services driven by machine learning. In a separate transaction, H.I.G. has acquired all the assets of Xtera Communications, a transatlantic provider of sub-sea fiber optics that previously filed for Chapter 11 in November; H.I.G. had entered a stalking horse offer for Xtera not long thereafter, according to reports.