Insiders Cash Out of the AI Complex as Lumentum, Corpay and CoreWeave See Heavy Selling

Insider transaction data is delivering a consistent and uncomfortable message: those closest to the AI hardware and infrastructure trade are net sellers into strength. At Lumentum, a supplier of optical and photonic components central to AI datacentre interconnect, the chief executive sold 5,438 shares for approximately $5 million while an executive vice president disposed of $2.89 million — both after a period of substantial share appreciation. Corpay's group president sold $10.65 million of common stock, and Magnetar Financial reduced its CoreWeave position by $33.4 million, a meaningful supply event for a name whose float dynamics remain sensitive. Exponent's chief executive sold $113,135. Individually, each transaction admits benign explanations: diversification, tax planning, pre-arranged plans. Collectively, the pattern is harder to dismiss, particularly when set against valuation dispersion in the sector — where the debate over Arista Networks at roughly 51x forward earnings versus Palantir at 113x on comparable profitability illustrates how much narrative premium is embedded. Meta CFO Susan Li's share acquisition, with stock withheld for tax obligations, is a compensation mechanic rather than a conviction signal. Investors should read the aggregate insider flow as a caution on valuation, not on the underlying demand cycle.