Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:
- Shares in Mediobanca rise as much as 9%, the most since last April, after Banca Monte dei Paschi di Siena’s board approved a plan to pursue delisting the investment bank.
- Bayer agreed to pay more than $7 billion as part of a major push to resolve current and future cancer lawsuits over its top-selling Roundup weedkiller.
- Shares in British company Raspberry Pi Holdings Plc rose as much as 26% on investor optimism over how its simple personal computers could be used for artificial intelligence.