The Belgrade bourse's blue-chip BELEX15 index slid 0.45% to 728.37 points after inching down 0.03% a day earlier.
The broader BELEXline index dropped 0.68% to 1,392.62 points after shedding 0.02% on Thursday.
The joint SRX index of the bourses in Belgrade and Vienna fell 0.31% to 325.15.
The bourse's total turnover tumbled to 87 million dinars ($1.37 million/922,176 euro) from 325 million dinars on Thursday.
Blue chip AIK Banka recorded the day's highest turnover of 42.6 million dinars, adding 1.78% to end at 2,750 dinars.
Lender Univerzal Banka posted the day’s second highest turnover of 11.2 million dinars. Shares fell 2.93% to 7,000 dinars.
Blue chip dairy firm Imlek had the session’s third highest turnover of 3.0 million dinars with shares rising 1.79% to 1,649 dinars.
News daily Politika posted the biggest climb on Friday. Shares surged 12% to 140 dinars. Electrical engineering company Energomontaza paced the back-sliders with shares tumbling 12% to 3,872 dinars.
Fallers outnumbered climbers 31 to 13, while the shares of 13 companies remained flat on the last working day before the weekend.
(1 euro= 94.3254 Serbian dinars)