UnitedHealth Stock Surges to Third in Trading Volume on Medicare Enrollment Progress Amid Ongoing Investigations

, 2025, . The rally followed a regulatory filing indicating the insurer is on track to meet its Medicare Advantage enrollment targets, a critical factor for its revenue structure. , aligning with historical benchmarks but signaling stability amid recent operational challenges.

Despite the positive enrollment outlook, UnitedHealth continues to navigate significant headwinds. Ongoing Department of Justice investigations into alleged misconduct, including accusations of incentivizing nursing homes to avoid hospital care for seniors, remain unresolved. Additionally, the company lost its CEO earlier this year amid personal conduct issues, raising governance concerns. These factors underscore long-term risks, even as the Medicare Advantage progress provides a near-term boost.

A backtest of a liquidity strategy from January 1, 2022, to September 9, 2025, evaluated daily-rebalanced portfolios of top 500 stocks by trading volume. The strategy’s performance metrics, including rebalancing costs and benchmarks, require further specification for precise implementation. However, the methodology highlights the potential of volume-driven strategies in capturing short-term , particularly in high-liquidity environments like UnitedHealth’s recent trading activity.