SOFIX posted its biggest loss on January 2, when it shed 6.59%. Five days earlier the index had lost 5.06% in one day.
The blue-chip index advanced by more than 6% on January 25, which is also the biggest daily gain so far this year.
The broader BG40 index posted its biggest drop this year on January 21 (-8.41%). The index rebounded by 8.02% on January 25.
The SOFIX has lost 38.65% since the beginning of the year, while the BG40 has declined by 46.48% so far.