Corporate executives in the U.S. are selling their stocks at unprecedented levels, with the ratio of insider sellers to buyers reaching nearly 6:1. This trend occurs as stock markets hit all-time highs, raising questions about the motivations behind such actions. Notably, there have been no insider purchases reported for certain companies, including Palantir Technologies, which is currently valued at 160 times its forward earnings. Analysts suggest that this level of insider selling is among the highest seen in the past decade, prompting speculation about whether executives anticipate a market peak similar to the pre-Lehman Brothers crisis.