He is best known as the co-founder and co-CEO of Nord Security, a global cybersecurity company that provides a popular VPN service NordVPN.

It currently includes a web intelligence collection platform Oxylabs, a hosting provider Hostinger, and a cybersecurity company Surfshark.

[4] Tesonet is a shareholder at Šiaulių Bankas, one of the biggest banks in Lithuania,[5] where Okmanas currently holds a seat on the supervisory board.

[8] Through Tesonet, Okmanas is also a venture-capital investor in various industries, including gaming, adtech, AI, retail, and deep tech.

[12] He contributed to the development of the solution, significantly reducing the time required for TCP packets to travel between the client, the VPN server, and their ultimate destination.

[21] In 2017, Okmanas co-founded Nord Security, an umbrella company for several cybersecurity solutions both for clients and businesses, like NordVPN, NordLayer, and NordPass.

[22] He is also a member of the board of trustees at the Vilnius University Institute of International Relations and Political Science, together with the eighth President of the Republic of Lithuania Dalia Grybauskaitė and other prominent Lithuanian figures.