The ISEQ index of Irish shares fell 51.13 points to 5,610.33 today as a number of heavy-hitters saw their stocks fall.
Financials suffered amid the announcement that the number of people out of work in the US during the past week was significantly higher than expected.
This sent the Dow Jones Industrial Average down nearly 90 points although it was finding some support close to the key 10,000 threshold.
Fears over further disruption to Nigerian oil output also continued to haunt traders, with a barrel of US light crude climbing back to the 50 US dollars mark.
Bank of Ireland stock fell 24 cent to €10.96. Anglo Irish Bank was down 19 cent to €14.86, while Irish Life and Permanent fell 5 cent to €13.
AIB was also down despite early gains. It shed 10c to €13.50.
Icon was also hit hard, losing a massive €3.63 or 12.16%, to close at €26.22.
Many stocks remained flat, giving the market little opportunity to reclaim the losses made by the financials.
Unidare made significant gains, adding 82 cent, over a third of its share price, to close at €3.12.