Every weekday, the CNBC Investing Club with Jim Cramer releases the Homestretch — an actionable afternoon update, just in time for the last hour of trading on Wall Street. Markets: Stocks tumbled Thursday as concerns about eye-watering valuations in AI-linked names persisted. The S & P 500 shed nearly 1% in afternoon trading. But the market's big laggards were in tech, as the Nasdaq retreated more than 1%. Club holdings Nvidia and Meta Platforms declined 2.8% and 2%, respectively. Investors also looked at fresh economic data that indicated a massive increase in corporate layoffs. Job cuts last month reached their highest level of any October reading in over two decades, according to outplacement firm Challenger, Gray & Christmas. The government's ongoing shutdown is likely playing a hand i

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