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Acquisition, Goodwill and Acquisition-Related Intangible Assets
 12 Months Ended
Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Acquisition, Goodwill and Acquisition-Related Intangible Assets Acquisition, Goodwill and Acquisition-Related Intangible Assets
Acquisition and Goodwill
    On June 30, 2025, we completed the acquisition of the VeloCloud business ("VeloCloud") from Broadcom for total cash consideration of $300.0 million. VeloCloud's secure, AI-optimized cloud WAN portfolio provides seamless connectivity to customer sites of any type, complementing Arista's leading data center and campus wired/wireless portfolio. The preliminary purchase price allocation based on the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date, included $268.4 million of intangible assets, $148.0 million of goodwill and $116.4 million of net tangible liabilities assumed as of June 30, 2025. A portion of the goodwill is deductible for tax purposes. The rest of the changes in the carrying value of goodwill for the year ended December 31, 2025 were not material.
Acquisition-Related Intangible Assets
Acquisition-related intangible assets, included in other assets, are subject to amortization on a straight-line basis over their estimated useful lives, as we believe this method most closely reflects the pattern in which the economic benefits of the assets will be consumed. The following table presents details of our acquisition-related intangible assets as of December 31, 2025 and 2024 (in millions, except for years):
December 31, 2025December 31, 2024
Weighted Average Remaining Useful Life (in years)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Developed technology4.0$241.1 $(139.0)$102.1 $154.9 $(119.2)$35.7 
Customer relationships6.2224.3 (48.9)175.4 54.6 (29.5)25.1 
Trade name4.524.9 (13.6)11.3 12.4 (11.2)1.2 
Total5.3$490.3 $(201.5)$288.8 $221.9 $(159.9)$62.0 
Amortization expense related to acquisition-related intangible assets was $41.6 million, $26.8 million and $33.4 million for the years ended December 31, 2025, 2024 and 2023, respectively.
As of December 31, 2025, future estimated amortization expense related to the acquired-related intangible assets is as follows (in millions):
Years Ending December 31,Future Amortization Expense
2026$61.3 
202757.4 
202854.0 
2029 and thereafter116.1 
Total $288.8