Palantir and Sandisk Both Posted Blowout Earnings in 2026. The Stock Market Rewarded Only One of Them the Same Day. Here's the Difference.

Palantir's stock fell after its 2026 earnings report while SanDisk surged, despite both companies posting strong results. The divergence came down to valuation and sector concerns: Palantir traded at 149x earnings versus SanDisk's 47x multiple, and investors are pricing in risk that AI agents could disrupt traditional SaaS business models.

SanDisk's rally was fueled by robust NAND flash memory demand from data centers and a strategic pivot to long-term contracts, signaling pricing stability and revenue visibility. The company's hardware play benefited from secular tailwinds in storage infrastructure tied to AI workloads.

Palantir's growth momentum couldn't overcome valuation headwinds. At nearly 150x earnings, the market appeared to take profits despite the company's solid performance, with concerns mounting that autonomous AI agents could eventually commoditize enterprise software services. The 102-point valuation gap between the two stocks illustrates how differently the market is rewarding growth depending on business model durability and multiple expansion limits.