Core Viewpoint - Investor enthusiasm for obesity treatment drugs is waning due to concerns over the rise of generic drugs, disappointing results from next-generation drug trials, and aggressive price reduction demands from the Trump administration [1][3]. Group 1: Market Performance - The two major weight loss drug manufacturers, Novo Nordisk and Eli Lilly, have faced a crisis of investor confidence, losing a total of $252 billion in market value this year, equivalent to the entire market value of Hermès [3]. - Since their peak last year, the total market value loss has exceeded $600 billion, with Novo Nordisk's stock down 49% and Eli Lilly down 11% [3]. - Novo Nordisk has lost $166 billion in market value, while Eli Lilly has lost $86 billion [3]. Group 2: Product and Market Dynamics - The once-promising obesity treatment business is undergoing a sharp adjustment, with products like Novo Nordisk's Wegovy and Ozempic, and Eli Lilly's Zepbound and Mounjaro, seeing a return to rational market expectations [4]. - Novo Nordisk has lost $367 billion in market value since its peak in June last year, with a decline of over two-thirds [5]. - Eli Lilly's stock hit a low not seen since February 2024, primarily due to disappointing trial results for its oral weight loss drug orforglipron, resulting in a 29% decline and a $250 billion market value loss since its historical peak [5]. Group 3: Policy and Regulatory Environment - The Trump administration's tough stance on the pharmaceutical industry has become a major concern for investors, with 15 other pharmaceutical companies also receiving price reduction demands [7]. - Broader concerns over tariffs and price reductions have impacted the entire pharmaceutical sector, with the top ten pharmaceutical groups in the US and Europe losing a combined $128 billion in market value this year [7]. Group 4: Insider Confidence Signals - Despite challenges, there are signs that market sentiment may be bottoming out, as five directors and executives at Eli Lilly purchased stock following disappointing earnings, marking the first insider buying in three years [9]. - CEO Dave Ricks made a significant purchase of $1.1 million in stock, indicating a belief that the sell-off was excessive [9]. - The current low price-to-earnings ratio for the pharmaceutical sector may lay the groundwork for a future rebound, highlighting the vulnerability of even the most promising medical innovations to policy changes and market sentiment fluctuations [9].