Members of the High Energy Group Physics group of Theoretical Physics Department (F-1) have successfully organized international workshop Portorož 2025: Particle Physics from the Early Universe to Future Colliders, 21. - 25. April, bringing together leading physicists working on open problems of theory and phenomenology of particle physics, such as flavour puzzle, hierarchy problem, strong CP problem and axion-like particles, CP violation in the universe, role of effective theories. The goal was to explore key topics in elementary particle phenomenology and theory. We've had 50 invited talks which sparked lively discussions on the modern directions in theory and phenomenology of the Standard Model and beyond-the-Standard-Model scenarios in different physical settings: hadron colliders including LHC and future High-luminosity LHC, future high-energy colliders, high-intensity experiments probing flavour dynamics and CP violation, early universe and astroparticle phenomena. The workshop achieved its main goal of connecting experts from different particle physics subfields to discuss about the near and long-term future of the field.