ZURICH/GDANSK, May 20 (Reuters) - Here are some of the main factors that may affect Swiss stocks on Wednesday:

GALENICA AG GALE.S

BlackRock reports stake of 4.989% in Galenica AG

ams-OSRAM AGAMS2.VI

BlackRock reports stake of 4.802% in ams-OSRAM AG

NESTLE SANESN.S

Nestle NESN.S and Danone DANO.PA are facing fresh scrutiny over the handling of infant formula contamination after reports published on Tuesday by French, Belgian and Swiss media questioned the speed of recalls of potentially harmful products

ANNUAL GENERAL MEETINGS

PARTNERS GROUP PGHN.S - 46 CHF/shr dividend proposed

ECONOMY

SNB US Dollar auction due at 0800 GMT

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