Medicare Insurance Stocks Plummet... $6 Billion Vanished in a Day

Humana Inc. (NYSE: HUM) plunged 21.11% on January 27th, closing at $207.99. Its market capitalization shrank to about $25 billion (roughly ₩34 trillion), wiping out some $4.3 billion (approximately ₩6 trillion) in a single trading day.

The sell-off was triggered when the U.S. Centers for Medicare & Medicaid Services (CMS) proposed a mere 0.09% increase in Medicare Advantage plan payments for 2027—well below the 4–6% rise investors had anticipated. The same disappointment weighed on peer insurers such as UnitedHealth Group and CVS Health, dragging Humana’s shares to a 52-week intraday low.

As one of the largest health insurers with a significant Medicare Advantage footprint, Humana is particularly sensitive to policy changes due to its reliance on government programs serving seniors and vulnerable populations. With rising utilization, mounting cost pressures and potential reductions in plan offerings already raising growth concerns, this tentative rate proposal has underscored the sector’s regulatory risks.