Rival watchmaker Richemont, owner of luxury brands Dunhill, and Van Cleef & Arpels, plunged shortly by 15.5 per cent.
Luxury watchmakers have already been battling weakening sales in Asia. Timepieces make up more than a 10th of the country's total exports, led by brands including Rolex, Swatch's Omega and Richemont's Cartier.
Chocolate maker Nestle closed 6.2 per cent lower, with analysts warning the company behind KitKats and Nescafe has the bulk of its central costs in Switzerland. Banks UBS, Credit Suisse and Julius Baer were also all badly hit. Julius Baer suffered record falls, dropping by as much as 11.5 per cent, with UBS down at one point by 11 per cent and Credit Suisse plunging 12 per cent.
Swiss pharmaceutical companies Roche, BB Biotech and Actelion all suffered falls. Life sciences company Lonza said the surge would hurt its competitiveness and viability of its research and development facility.
"A weaker euro will mainly negatively impact the competitiveness of our Visp operations as more than 90 per cent of the products are exported, whereof the euro has an important share," a Lonza spokesman said.
"The minimum exchange rate was an important measure for Visp to be competitive and to have a stable exchange rate."
Telegraph Group Ltd