United Therapeutics is trading at $531.19, up 10.33%; no fresh company-specific announcement explaining the September 30 surge was identified in available coverage. - Recent analyst commentary was not a new catalyst for the move. - On September 30, cooler inflation data lifted stocks: the Nasdaq gained about 0.9% and the S&P 500 about 0.5%. Those gains provide context but do not explain United Therapeutics’ much larger advance.