Core Viewpoint - Arista Networks' stock experienced a significant decline due to the Trump administration's announcement of new tariff policies, which raised concerns about potential impacts on global trade and the company's cost structure [1][2][3]. Company Performance - Arista Networks' share price fell by 11.1% in a trading session where the S&P 500 dropped by 4.9% and the Nasdaq Composite decreased by 6% [1]. - The company has been experiencing strong sales growth, particularly in relation to artificial intelligence trends, but there are concerns that business performance may fall below previous expectations due to rising costs from tariffs [3]. Financial Guidance - In its last earnings update, Arista Networks projected sales between $1.93 billion and $1.97 billion for the first quarter, with a targeted non-GAAP gross margin of approximately 63% [4]. - The implementation of new tariffs is set to occur after the close of Q1, suggesting that the company may still meet or exceed its sales targets for that period [4]. Outlook and Risks - The new tariff outlook indicates that Arista Networks' gross margin could decline significantly, and sales for the remainder of the year may fall short of analyst expectations [5].