Arista Networks is trading 3.00% up at $213.11 amid a broadly higher market and tech optimism. - The Nasdaq Composite and S&P 500 are both up more than 0.5%. - Investor optimism around AI and the upcoming earnings season is supporting tech shares. - No clear company-specific catalyst was identified. A market report noted light volume during the tech-led rally; the move appears more consistent with broader sentiment than a fresh company announcement.