Stocks @ Night is a daily newsletter delivered after hours, giving you a first look at tomorrow and last look at today. Sign up for free to receive it directly in your inbox. Here's what CNBC TV's producers were watching on Wednesday and what's on the radar for Thursday's session. The S & P 500: A new high The relative strength index on the S & P 500 is now at 68. Seventy is considered "overbought" and 30 is considered "oversold." An RSI is one of several indicators a trader might use to determine if a stock or index has run up or fallen too far, too quickly. However, being overbought or oversold doesn't necessarily mean the stock is in for an imminent rise or fall. NewEdge Wealth's Rob Sechan said on "Closing Bell" on Wednesday that half of the S & P 500 stocks are above their 50-day movi

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