On this episode of Stock Movers:

- Ocado shares tumbled by the most since February after a major US partner questioned the future of its warehouse networking, raising concerns that it could close existing sites as it looks to cut costs.
- Fresnillo and other European miners are outperforming on Friday thanks to a broad rise in metal prices, with gold, copper, aluminum and nickel all gaining ground.
- Novartis shares drop as much as 2.9% after the stock was downgraded to sell from neutral at Goldman Sachs. The analysts say the Swiss drugmaker’s valuation looks “stretched”.

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