Summa offices in HQ (Belgium) are closed on following days in 2025:
| April 21 | Public Holiday |
| May 1 - 2 | Public Holiday + 1 day |
| May 29 - 30 | Public Holiday + 1 day |
| June 9 | Public Holiday |
| July 21 - 25 | Summer Holidays |
| August 15 | Public Holiday |
| November 1 | Public Holiday |
| November 10 -11 | Public Holiday + 1 day |
| December 25 - 31 | Christmas closing |
| January 1, 2026 | New Year |
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