Amgen stock closed at $405.18 on Cboe BZX after hours on September 23, 2026, following a 4.34 percent gain on the previous day.
The latest regular-session close was $410.24 on the Nasdaq on September 22, with Amgen opening at that price the next day.
The intraday range on September 23 ran from $398.61 to $412.73, and volume reached 166,000 shares.
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