If SCOTUS overturns Humphrey's Executor, it would significantly expand presidential control over independent agencies like the FTC. This would be a major positive catalyst for Big Tech companies currently facing antitrust scrutiny (e.g., Amazon, Meta, Google), as it implies the President could fire aggressive regulators (like Chair Lina Khan, if she remains) at will. While the impact on the broader market (S&P 500) might be muted, specific antitrust-target stocks would likely see a significant tradable rally.