Cisco Stock After Hours on December 9, 2025: AI Boom, $80 Resistance and What to Watch Before the December 10 Open

Cisco Systems, Inc. (NASDAQ: CSCO) is finishing December 9 in a strong position, hovering just under a key psychological line at $80 after another AI-fueled rally.

The stock closed regular trading at about $79.51, up roughly 0.8% on the day from the previous close near $78.86, and then ticked slightly higher in after-hours to around $79.53 as of 8:00 p.m. ET. ^[1]

That move comes on a day when the broader market was mixed: the S&P 500 slipped about 0.1%, the Dow fell roughly 0.4%, while the Nasdaq was roughly flat, as traders stayed cautious ahead of the Federal Reserve’s December meeting. ^[2]

Here’s what happened to Cisco stock after the bell on December 9, 2025, and what matters most before the opening bell on December 10.

Quick snapshot for traders in a hurry

• Close (Dec 9, 2025): ~$79.51
• After-hours: ~$79.53 (+0.03% vs close) ^[3]
• Day’s range: ~$78.51 – $79.88, brushing a 52‑week high near $80.06 ^[4]
• YTD gain: roughly +35–38% in 2025, outpacing the S&P 500 ^[5]
• Valuation: P/E…