[Micron, SanDisk and other chip stocks climb](https://www.marketwatch.com/story/micron-sandisk-and-other-chip-stocks-climb-as-investors-are-more-confident-about-ai-spending-128374fa?mod=mw_rss_topstories) as investors get more confident about AI spending. But the real signal isn't the stock price — it's what insiders know.

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