On June 4, 2015, immediately after the ceremony for the awarding of the medal winners of the Australian Mathematics Competition, the mathematical talents of Bulgaria, together with their teachers and supporters celebrated the 15th anniversary of the founding of the High School Students Institute of Mathematics and Informatics (HSSI). Organizers of the event were the founders of HSSI - Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, the Union of Bulgarian Mathematicians, "Evrika" Foundation and "St. Cyril and St. Methodius " International Foundation.

Chairman of the Board of Trustees of HSSI Corr. Member Oleg Mushkarov presented the story of HSSI, whose head was in those 15 years. With the presentation Acad. Peter Kenderov, Chairman of UBM, followed the creation and development of the Students Institute.

On behalf of the President of the Republic of Bulgaria greeting was presented by Mrs. Anna-Marie Vilamovska, Secretary of Innovation and Health, in which was expressed admiration for targeted efforts for the development of brilliant young Bulgarian minds and the development of the Bulgarian society.

"The creation of the Students Institute of Mathematics and Informatics has become an international reference on how to identify and develop talents, how they learn to compete, to work in a team, to find creative solutions, bold strategies and innovative tactics - tools with which to achieve first places in national and international competitions, victories which we are all proud of," was said in a congratulatory message.

Congratulations on behalf of the Ministry of Education and Science was presented by the Deputy Minister Prof. Nikolay Denkov.

Award plaques and diplomas were awarded for significant contributions of teachers and lecturers of Mathematics and Informatics from many universities and schools in the country, to colleagues with a huge contribution to the creation and validation of HSSI, for material and logistical support and contribution to the scientific development. Host of the ceremony was the Director of the Institute of Mathematics and Informatics at BAS Acad. Julian Revalski. A musical greeting was performed by students from the National School of Music "Lyubomir Pipkov".