Is Arista Networks Stock Increasing Your Market Risk

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If you own Arista Networks (ANET) or plan to, you hold a company whose Etherlink switches connect computers inside AI data centers, and which was named to the S&P 100 in September. Your other money probably follows the market, so what matters is whether Arista moves with it, harder than it, or against it. Does owning Arista make the ups and downs of your whole portfolio bigger?

Yes, Arista Stock Magnifies The Market's Daily Moves

During the year to November 9, 2026, Arista stock moved further than the market in both directions. On an average day when the S&P 500 rose, Arista's gain equaled 231% of the index's rise, enough to lift a $10,000 holding by about $152. When the index fell on an average day, Arista's decline equaled 205% of the market's drop, and the same holding lost about $129.

Across that year, Arista shares tended to move 2.37 times as far as the S&P 500, in the same direction. That figure is a different measure from the two above: it compares Arista's moves with the index's across all days together, not as separate averages for up days and down days. Their annual volatility, a measure of how widely the daily price swings range, was 56.4%, against 13.7% for the index. So beside money that already follows the market, Arista does not steady your portfolio: it adds to the market risk you already carry, and makes it larger.

Will Arista Stock Keep Swinging This Hard?

Arista is tying more of its business to AI build-outs that are still being proven, so swings like the past year's look likely to continue. Management expects sales of its AI fabrics, the networks that link AI computers, to double to about $7 billion in 2027, faster than any other part of the business, and it forecasts total revenue of about $18.5 billion that year. Arista has also committed to $11.4 billion of purchases, mostly chips for new products and AI deployments. Management expects the next step, Ethernet for scale-up inside AI racks, to begin trials in 2027 and to reach production in 2028.

Arista's daily moves matched the market's only in part over the past year: their correlation, a score that would be 1 for two stocks moving in lockstep, was 0.57. So much of Arista's swing is its own rather than the market's.

Has Arista Stock Paid You For Its Swings?

So far, yes. Since November 1, 2021, a period of slightly more than five years, Arista stock returned 48.5% a year including dividends, compared with 11.9% for the S&P 500. Annual volatility over those same years registered at 49.8%, against 17.1% for the index. Arista earned 0.974 points of annual return for each point of that volatility, while the S&P 500 earned 0.696 points, meaning Arista's swings have paid better than the market's.

If the past year's pattern holds, Arista will on average lift your total by more than the index does on days the market rises, and take more away on days it falls, though not on every single day. If you already own other companies selling into AI data centers, Arista adds to that same bet rather than spreading it. For the risk to stay worth taking, Arista's AI business would need to grow as management forecasts for 2027. Fourth-quarter revenue, expected when Arista reports in February 2027, is the next measure to watch.

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