Luka Koper's shares ended the session at 34.50 euro, down 2.54%, LJSE data showed.
Reinsurer Sava Re [LJE:POSR] led the blue-chip gainers to close up on Monday. Its share price grew 1.20% to 33.80 euro.
The blue-chip SBITOP index ended at 1,488.43 points, down 0.26%. The SBITOP TR index, which also tracks dividend distribution, also dropped 0.26%, to 2,014.20 points.
Total daily regulated market turnover went down to 1.2 million euro ($2.3 million) on Monday from 1.3 million euro on Friday.
($ = 0.92107 euro)