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Why Amgen stock plummeted yesterday

By Wealth Awesome -
Stocks & ETFs:AMGN.US

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Amgen's shares took a significant hit following disappointing news from a competitor.

Amgen Inc. (NASDAQ: AMGN) experienced a steep decline of 10.08% in its stock price during yesterday's trading session, closing at CA$393.17. This drop was primarily influenced by adverse developments related to a competitor's drug trial.

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Investor takeaway: Investors reacted swiftly to Novartis' recent announcement regarding its cholesterol drug, which failed to meet expectations in a late-stage trial. This news raised concerns about Amgen's similar drug in development, leading to a sell-off.

10.08% Decline in Amgen's Stock

This significant drop reflects investor fears and market reactions to competitive pressures in the biopharma sector.

Bull case

Despite the recent setback, some analysts think the market may have overreacted. They believe Amgen could rebound as it continues to develop its drug pipeline.

Bear case

The failure of Novartis' drug might signal broader challenges in the cardiovascular drug market. This raises concerns for Amgen's future, and if investor sentiment stays negative, further declines could follow.

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Market Reaction to Novartis' Drug Trial Failure

The catalyst for Amgen's significant stock drop was Novartis' announcement that its cholesterol drug did not succeed in a critical late-stage trial aimed at cardiovascular outcomes. This news sent shockwaves through the biopharma sector, with investors fearing that Amgen's similar drug could face similar challenges.

Broader Market Trends Impacting Amgen

Amgen's decline also mirrored a broader downturn in the stock market, where inflation concerns and rising oil prices contributed to a negative trading environment. The Nasdaq Composite fell 0.3%, reflecting a general risk-off sentiment among investors, further exacerbating the situation for Amgen.

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Wealth Awesome
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Published: September 9, 2026
Last Updated: September 9, 2026
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