The Swiss blue-chip index SMI, a measure of the largest and most actively traded companies, rose 0.06%, or 3.31 points, to 5,911.82. The broader Swiss Performance Index added 0.14%, or 7.74 points, to 5,503.45.
"A disorderly exit would likely lead to a massive run on bank deposits, a meltdown of the Greek banking system and further aggravation of Greece's large economic downturn."