OTP Bank fell 14.69% to HUF 13,010. Turnover of the share reached HUF 46.41 billion, nearly 80p%of the HUF 59.14 bln session total.
Oil and gas company MOL dropped 7.22% to HUF 2,340 on turnover of HUF 6.48 bln.
Pharmaceutical comapny Richter was down 6.75% at HUF 7,250 on turnover of HUF 4.09 bln.
Magyar Telekom lost 2.07% to HUF 425 on turnover of HUF 941 million.
The bourse's mid-cap BUMIX index was 7.99% lower at 3,684.09.
Elsewhere in the region, Warsaw's WIG 20 dropped 10.86% and the Prague PX lost 4.77%.
Western Europe's biggest equities indices were lower ahead of the end of trade on Thursday. Frankfurt's DAX dropped 3.77%, London's FTSE 100 fell 3.79% and the CAC 40 in Paris was down 3.89%.