Arista Networks: Short Sellers Step Back as Q3 Print Approaches

Arista Networks has seen short sellers reduce their positions meaningfully ahead of Monday's Q3 report, even as the stock gave back ground over the past month. Short interest has dropped 18% over the past month to around 0.9% of the free float, a level too low to register as a meaningful bearish signal.

The more interesting tension is between the stock's recent price weakness and the absence of short conviction behind it. Arista is down 10% over the past month to $184.22, yet short sellers have been cutting exposure throughout that decline. Borrow costs have ticked up roughly 67% over the past week to 0.89%, but from a very low base and still well below 1%, hardly a stress indicator. Availability remains effectively unlimited, with the lending pool carrying far more shares than the market has any appetite to borrow. The month's weakness looks like long holders reassessing rather than bears pressing a new thesis, consistent with the picture laid out five days ago.

The debate heading into the print centres on whether Arista's AI-driven growth story can survive its own raised bar. Bulls point to management's upgraded 2026 revenue growth guidance of 27.7% and AI revenue target of $3.5 billion, backed by $6.2 billion in deferred revenue and operating margins running near 46% to 47%. The networking franchise continues to win share in cloud and data centre infrastructure, with Microsoft and Meta as anchor customers. Bears counter that those same customers are also the concentration risk: any shift in hyperscaler capex plans creates outsized quarterly volatility. TD Cowen trimmed its target from $250 to $205 in mid-October while keeping a Buy rating, a sign of recalibration rather than retreat. The consensus mean target of $243 implies more than 30% upside from current levels, though that figure reflects a blend of targets set at different points in the stock's recent range, and the gap to current prices has widened as the stock pulled back.

Options positioning has edged more defensive over the past month, with the put/call ratio climbing from around 0.85 in late September to 0.95, above its 20-day average of 0.91. The z-score of 0.71 puts this in cautious rather than alarmed territory, well short of the 52-week high of 1.05. Retail attention has also picked up: Wikipedia page views for Arista rank more than two standard deviations above their own 90-day history, suggesting the upcoming print is drawing broader attention than usual. Among correlated peers, LITE surged 22% on the week while SILC fell 20%, pointing to sharp divergence within the networking cohort rather than a clean sector read.

The print will test whether Arista's AI infrastructure narrative can sustain a premium valuation, with a trailing P/E near 37 and EV/EBITDA around 28, against a backdrop of trimmed Street targets and a stock that has already given back a significant portion of its post-August rally.