May 16 -Here are some of the main factors that may affect Swiss stocks on Tuesday:

UBS UBSG.S

At least seven top Barclays Plc BARC.L technology, media and telecom investment bankers have resigned to join UBS Group AG UBSG.S in the United States in the last few days, people familiar with the matter said. (Full Story)

COMPANY STATEMENTS

SONOVA HOLDING AGSOON.S

Full year results due.

ANALYSTS' VIEWS

COMPAGNIE FINANCIERE RICHEMONT SA CFR.S: TD COWEN RAISES TARGET PRICE TO CHF 177 FROM CHF 152

SWISS LIFE HOLDING AG SLHN.S: HSBC CUTS TARGET PRICE TO CHF 605 FROM CHF 625

ECONOMY

No major Swiss economic data scheduled.

Reporting by Zurich newsroom and Berlin Speed Desk

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