New York, January 22, 2026, 18:24 (EST) — Trading extended into after-hours
- After a strong run during regular hours, Arista Networks shares climbed roughly 9% in after-hours trading.
- Analysts highlighted a growing investor interest in “backend” AI data-center networking equipment.
- Options volume surged as traders piled into near-dated $140 calls.
Arista Networks Inc shares climbed $11.12, or 8.7%, to $138.41 in after-hours trading Thursday, after hitting a session high of $146.08. About 14.9 million shares traded hands, pushing the company’s market value to around $183 billion, according to market data.
The networking gear maker topped the S&P 500 gains, despite no obvious catalyst. Ryan Koontz, a Needham & Co analyst, told Barron’s, “I’ve been aware of increasing buy-side interest going long in the stock.” He pointed to rising spending on switches that connect AI servers in data centers, even if other areas slow down. Barron’s also reported Ciena was flat, while Cisco Systems rose about 0.9%. Barron’s
Options activity mirrored the surge. Nasdaq.com’s options roundup reported about 40,497 Arista contracts changing hands, with especially strong volume in $140 strike calls set to expire January 30. Calls let buyers lock in a purchase price and typically signal short-term bullish bets.
Arista caught analysts’ attention a day before, too. Seeking Alpha highlighted a BNP Paribas note that named Arista as a top artificial intelligence pick for 2026, along with other data-center supply-chain players.
The rally found traction in a stronger session. The S&P 500 climbed 0.5% Thursday, with the Nasdaq gaining 0.9%, the Associated Press reported.
Arista provides client-to-cloud networking equipment tailored for AI, data centers, campus, and routing setups. Its key software offering is the Extensible Operating System (EOS), per the company’s profile on Reuters.
Arista is gearing up to report earnings after U.S. markets shut on February 12, with a conference call slated for 4:30 p.m. ET. The company also pointed to investor events later in February and early March, where CEO Jayshree Ullal and other executives will be speaking.
Investors are also watching interoperability testing in Europe closely. Arista announced it will join an EANTC transport and cloud networks interoperability test starting January 26. The multi-vendor exercise aims to demonstrate that equipment from different providers can operate seamlessly across various networks.
But the sharp jump works both ways. If a stock surges without any clear news behind it, it can just as quickly lose steam when risk appetite wanes or the next earnings report falls short.
Traders have their eyes on February 12, when Arista releases earnings and updates on demand linked to AI data-center expansions.
