The BELEX15 shed 0.04%, closing at 986.31 points.
Messer Tehnogas was the sole blue-chip decliner on Monday, dropping 1.53% to close at 24,001 dinars as 5 shares traded.
At the other end, oil and gas company NIS [BEL:NIIS] led the blue-chip gainers by rising 0.99% to close at 814 dinars, generating the single highest turnover of 4.1 million dinars for the day.
The broader BELEXline, a free-float market capitalisation weighted index, also fell, closing 0.12% lower at 2,205.41 points.
Total turnover on the Belgrade bourse rose to 12.4 million dinars ($110,000/102,500 euro) on Monday from 10.7 million dinars on Friday.
(1 euro = 117.070 dinars)