This book constitutes the proceedings of the PhD Symposium, Demos and Workshops from the 26th International Conference on Web Information Systems Engineering, WISE 2025, held in Marrakech, Morocco during December 15-17, 2025.

The 12 full papers and 2 short papers presented in this volume were carefully reviewed and selected from 38 submissions. The papers are organized in the following topical sections: Data Classification; AI and Multi-Agents; LLM-Driven Agents; Practical Applications and Demonstration.