The founders of HSSI are:

• The Union of Bulgarian Mathematicians (http://www.math.bas.bg/smb/)
• Evrika foundation (http://www.evrika.org)
• St Cyril and St Methodius International Foundation (http://www.cmfnd.org/)
• The Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (http://www.math.bas.bg)
  

Since 2005 American Foundation for Bulgaria has become general sponsor of HSSI.
Since 2007 The State Agency for youth and sports has become an active participant in the sponsorship of HSSI.
 

The activities of HSSI have also been supported financially by the following persons and organizations:

• Dr. Joann DiGennaro, President of CEE
• “Haemimont” Foundation
• “Computer Services” Ltd Sofia and Varna
• “Future for Bulgaria” Foundation
• Software Company SIRMA AI, Bulgaria
• Municipality of Varna
• Varna Free University
• Department for Information and Professional Qualification of Teachers at the Shumen University
• “Prima–S–Tours” Ltd Gabrovo
• Faculty of Mathematics and Informatics at the Plovdiv University
• Mathematics High School “Dr. Petar Beron” Varna
• Mathematics High School “Acad. Kiril Popov” Plovdiv

Many collaborators of the IMI, BAS devote significant part of their free time to keep the level of extra-curricular work with talented students high. Their work supports and enables HSSI to assist the intellectual and professional growth of the high school students. We say Thank you! to them as well.