$1,000 in Amgen Inc. in 2005 → $10,272 today
If you'd invested $1,000 in Amgen Inc. (AMGN) on January 1, 2005 — at the December 2004 month-end close of $43.07 — and held to the latest close (2026-08-), you'd have $10,272. That's a +927.2% total return — beating the S&P 500, where the same $1,000 became $6,360.
Nearby years: 2001 · 2002 · 2003 · 2004 · 2006 · 2007 · 2008 · 2009 all years →
FAQ
How much is $1,000 invested in AMGN in 2005 worth today?
$1,000 invested in Amgen Inc. (AMGN) at the month-end close of 2004-12- would be worth $10,272 at the latest month-end close (2026-08-), a total return of +927.2% with dividends reinvested.
Did $1,000 in AMGN in 2005 beat the market?
Over the same span, $1,000 in the S&P 500 index would be worth $6,360 — so Amgen Inc. (AMGN) beat the index by +61.5%.
What does "month-end close" mean for this calculation?
The scenario invests at the December 2004 month-end close (the price entering 2005) and values the position at the most recent month-end close (2026-08-). Intra-month extremes are shown on the AMGN calculator page.
Is the 2005–2026 return in AMGN typical?
No single year is typical. AMGN's best calendar-year return since 1983 was about +265.1%, and its worst was -32.0%.
Methodology
Amgen Inc. (AMGN) total-return data from January 2005 through the latest month-end close (2026-08-).
The entry price is the 2004 December month-end close and the exit is the latest available month-end close, both from adjusted (split and dividend) Yahoo Finance historical data.
Month-end resolution, no taxes or fees, and history never guarantees the future. For exact-date precision (including buying at a panic low), use the AMGN calculator page.
Compute your own AMGN scenario
Data: Yahoo Finance. As of 2026-08-. Not financial advice.