The ISEQ index of Irish shares dropped 129.65 points to 2,978.94 today, a fall of 4.17%.
The selloff reflected market trends across Europe which followed the shock move by Germany to ban short-selling of eurozone government debt.
Among the major fallers here were Arzyta, down €1.31 to €26.50; CRH, shedding 93c to €18.14; Paddy Power, down 90c to €25.10; DCC, falling 64c to €17.66; Smurfit Kappa, shedding 36c to €6.84; Elan Corp, down 35c to €4.70; Tullow Oil, down 25c to €12.81; Kingspan, down 24c to €6.91; C&C, falling 13c to €3.31; Kerry Group, down 10c to €22.65 and Ryanair, also down 10c, to €3.19.
Financial stocks were also on the back foot, with AIB shedding 8c to €1.18, Bank of Ireland down 3c to €1.40 and Irish Life & Permanent 12c off at €2.28.
In a day of little upward movement Merrion Pharmaceutical added 17c to €4.22.