Nvidia Gains; Northern Star Rejects Offer; Roblox Shares Drop

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

On this episode of Stock Movers:

- Nvidia (NVDA) shares are up after the board of the leader in AI chips authorized an additional $150 billion under the company’s existing share-repurchase program. The move increases the total remaining amount authorized to $235 billion.

- Australia’s Northern Star Resources Ltd. rejected a takeover approach from South African rival Gold Fields Ltd. that could have created the second-largest gold miner, saying the A$38.7 billion ($27.1 billion) cash-and-shares offer undervalued its business.

- Roblox (RBLX) was cut to underperform from hold at Jefferies, which said the stock’s 30% rally since the gaming company’s second-quarter results in July reflects an overly optimistic view of bookings for the next 12 months.

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