NEW YORK, December 29, 2025, 19:52 ET — After-hours
- Arista Networks shares rose 1.8% on Monday, bucking a broader market decline.
- The S&P 500 and Nasdaq ended lower as big technology shares pulled back in thin, holiday-affected trading.
- Traders are watching Tuesday’s U.S. housing and Chicago business-activity data for fresh direction into the New Year holiday.
Arista Networks shares ended up 1.75% at $134.15 on Monday and were last little changed in after-hours trading.
The gain stood out on a down day for U.S. equities, with the Nasdaq falling 0.50% and the S&P 500 down 0.35% at the close, according to Reuters.
That divergence matters in the final week of the year, when positioning and lighter liquidity can exaggerate moves in high-multiple growth stocks. Trading volume across U.S. exchanges ran below the recent average, Reuters reported.
Arista, a supplier of networking gear used in large data centers and AI infrastructure, has become a bellwether for spending on high-speed switching hardware.
The stock traded between $130.02 and $135.25 during Monday’s session, after opening at $131.15, market data showed.
Broader tech cooled as investors locked in gains into year-end. “There are signs of profit taking in certain momentum corners of the market,” Vital Knowledge’s Adam Crisafulli wrote in a note cited by Investing.com. Investing.com
In networking and infrastructure names, Arista’s outperformance contrasted with declines in some adjacent tech stocks, including Cisco Systems and Cloudflare.
Investors have kept a close eye on Arista’s ability to translate data-center demand into revenue and margins. In its most recent quarterly report, Arista posted revenue of $2.308 billion, up 27.5% from a year earlier, and reported a GAAP gross margin of 64.6%.
Valuation remains part of the debate. Arista trades at about 55 times earnings based on its latest reported P/E ratio, leaving the stock sensitive to shifts in rate expectations and risk appetite.
On Tuesday, investors will parse the S&P Case-Shiller home price index and the Chicago PMI, two reports that can move rates and high-growth stocks at the margin in light trading.
The calendar also tightens into the holiday. U.S. stock markets are open on Dec. 31 and closed on Jan. 1 for New Year’s Day, while bond markets close early on Dec. 31, MarketWatch reported.
For near-term traders, Monday’s intraday low around $130 is an obvious support level, while the $135 area—near the day’s high—marks the first resistance zone to clear if momentum returns.
