Amgen (AMGN) Fell 5% on a Drug That Isn’t Even Its Own. Here’s the Lp(a) Bet Now in Question.
Amgen (AMGN) stock fell 5% to $415 after Novartis' Lp(a)-lowering drug pelacarsen failed its Phase 3 trial, raising doubts about a similar hypothesis for Amgen's olpasiran. The failure challenges the idea that lowering Lp(a) reduces cardiovascular events, impacting Amgen's stock. Despite this, Amgen's diversified portfolio may cushion the impact.
How this was made

The 30-second read
Why it matters
Amgen's shares dropped 5% after hours, erasing $12 billion in value; the trial outcome raises doubts about the broader Lp(a) therapeutic class.
Market read
The trial miss creates immediate downside for Amgen and raises sector‑wide concerns for Lp(a) programs, potentially reshaping investor positioning in cardiovascular biotech.
What to watch
Strong performance of Amgen's other products (Repatha, Tezspire) and cash position could limit downside.
Background
Novartis' pelacarsen failure challenges the Lp(a) lowering strategy that Amgen's olpasiran relies on, prompting a market reaction.
Ticker impact
Amgen fell ~5% to $415 after-hours on Sep 4, 2026 after Novartis reported a Phase 3 failure that undermines the Lp(a) hypothesis behind Amgen's olpasiran.
Further downside possible if additional Lp(a) data disappoint; short‑term support around $410.
Trial failure is a primary catalyst; market already reacted 5% and low short interest suggests room for more pressure.
Novartis disclosed that its pelacarsen Phase 3 cardiovascular outcomes trial missed the primary endpoint, shaking confidence in Lp(a)‑lowering therapies.
Potential modest pullback if investors reassess pipeline; watch for earnings guidance.
Failure is material for the specific asset but broader portfolio may cushion price move.
Market effects
Lp(a) therapeutic hypothesis is questioned, pressuring biotech firms pursuing similar siRNA approaches.
US biotech equities may see heightened volatility as investors reprice cardiovascular‑drug pipelines.
The result could influence global pharma R&D spending on Lp(a) targets.
Counterpoint
Amgen's diversified portfolio and low short interest may make the dip a buying opportunity if olpasiran later succeeds.
Key entities
- companyAmgen Inc.
US biotech firm developing olpasiran, a Lp(a)-lowering siRNA.
- companyNovartis AG
Swiss pharma reporting pelacarsen Phase 3 miss.
- companyEli Lilly
Developer of lepodisiran, another Lp(a) siRNA.



