Latham Advises on Financing for Proofpoint’s Definitive Agreement to Acquire European AI-Security Provider

Proofpoint, Inc., a leading cybersecurity and compliance company, has announced it has entered into a definitive agreement to acquire Hornetsecurity Group, a leading pan-European provider of AI-powered Microsoft 365 (M365) security, data protection, compliance, and security awareness services. The acquisition is expected to close in the second half of 2025, subject to customary closing conditions.

Latham & Watkins LLP represented the financing sources supporting the acquisition with a cross-border team led by New York partners Alfred Xue, Stelios Saffos, Jesse Sheff, Peter Sluka, Victor Ludwig, and Michael Waldman, London partners Fergus Wheeler, Paul Yin, and Manoj Bhundia, New York counsel Preeta Paragash, and Los Angeles/Bay Area counsel Katherine Page, with associates Carlos Ibarguengoitia, Yoojin DeNiro, Philipp Hagenbuch, Daniel Ovadia, Ana Núñez Cárdenas, Chi-Emeka Egwuagu, Sharon Yin, William Council, Amber Morrow, Angela Lin, Amishi Magdani, and Prasanth Ramaswamy. Advice was also provided on employee benefits matters by Chicago partner Benjamin Rosemergy, with associate Tayler Evan Daniels; on intellectual property and data privacy matters by Bay Area partner Michelle Gross, with associates Kiara Vaughn, Karen Sung, and Claire Jensen; and on tax matters by New York partner Bora Bozkurt, with associate Sam Yang.