The Iseq index fell 81.27 points to 8,482.12 by close of trading this evening.
The fall came despite yesterday's improved performance when the exchange closed up 307.56 points at 8,563.39. Yesterday's rally came after €8.6 billion was wiped off the index's value in the previous week.
Most traded stocks have been drinks company C&C, Allied Irish Banks Plc, Ryanair Holdings Plc, Irish Life and Permanent Plc and Bank of Ireland.
Shares in drinks company C&C continued to fall following yesterday's second profit warning in two weeks. The company's share price plummeted by more than 27 per cent yesterday. C&C shares fell by 0.42 per cent by 10.30 this morning.
Allied Irish Banks was down 0.58 or 3.01 per cent at 18.670 and Bank of Ireland were down 0.32 or 2.29 per cent at 10.30am. Irish Life and Permanent fell 0.46 or 2.59 per cent to 17.290.
Ryanair's share value fell slightly after yesterday's rally which saw their share value increase by 12.5 per cent following better than expected results for the first-quarter. At 10.30 today, they had fallen 0.170 or 3.21 per cent at €5.130.