Nexthop AI, developer of custom-engineered networking hardware, software, and optics for AI data centers, has raised $500M in Series B funding led by Lightspeed Venture Partners. The round, oversubscribed at a $4.2B valuation, includes Andreessen Horowitz, Altimeter Capital, and Kleiner Perkins. Nexthop delivers high-performance, low-latency, lossless connectivity for scale-out, scale-up, scale-across, and front-end networks. The capital will fuel hypergrowth in product development and team scaling for hyperscalers.
Hyperscalers Plan $650B Capex Sprint
The raise aligns with hyperscalers committing over $650B in 2026 capex for AI infrastructure. Arista Networks raised its 2026 AI networking revenue guidance to $3.25B after Q4 2025 earnings beat. Broadcom reported Q1 FY2026 AI revenue of $8.4B, up 106% YoY. Nexthop's timing captures surging demand for efficient AI cluster networking beyond off-the-shelf gear.
AI Clusters Demand Lossless Fabrics
Explosive AI workloads require massive bandwidth in hyperscale data centers. Current solutions struggle with power constraints and latency in scale-out clusters serving training and inference. Legacy proprietary stacks limit flexibility for neo-clouds. Open networking adoption like SONiC addresses vendor lock-in but needs custom hardware integration.
Custom Switches Enable Scale-Out
Nexthop's 4000 Series offers 51.2Tbps fixed switches with 800G ports for scale-out and front-end networks. The 4200 Series provides 102.4Tbps in 2RU with 1.6T ports for back-end and front-end. 5000 Series delivers 25.6Tbps deep-buffer switches with 400G ports for interconnects. Software supports SONiC, FBOSS, or BYoNOS, paired with 800G+ optics including LPO and LRO. This joint development model co-engineers with customers for power-efficient AI fabrics.
Arista Alumni Target Efficiency Gap
Unlike software-only rivals, Nexthop integrates hardware, optics, and open NOS for hyperscalers. Aviz Networks raised $17M for open networking software. Arrcus secured $166M for hyperscale routing software. Cornelis Networks got $60M for HPC fabrics. Nexthop's full-stack approach fills the gap in custom, lossless AI connectivity.
Tier-1 VCs Signal Hyperscaler Traction
Lightspeed, which led the $110M launch round, returned for Series B with a16z's infrastructure expertise. Altimeter brings growth-stage scale from Snowflake IPO. Kleiner Perkins adds historic AI/enterprise bets. This syndicate validates Nexthop's product-market fit amid AI infra bottlenecks.
AI Networking Market Hits $213B
AI in networks market stands at $19.93B in 2026, projected to reach $213B by 2034 at 34.47% CAGR. Another estimate pegs it at $17B growing 27% CAGR. Incumbents like Broadcom eye $100B+ AI revenue by 2027. Startups trail with smaller rounds: Nile at $230M+ for NaaS, Aviz at $17M.
Ex-Arista COO Drives Differentiation
Founder and CEO Anshul Sadana spent 17 years at Arista Networks as COO, scaling sales from $0 to over $5B. He holds patents in Ethernet latency and dynamic service insertion. The team includes Arista alumni engineers and FAANG supply chain experts from Meta, Google, and Microsoft. This domain mastery positions Nexthop to disrupt with AI-optimized designs.
As Anshul Sadana, Founder & CEO, noted:
"Nexthop AI is a force-multiplier, as it partners with and works as an extension of the cloud companies’ engineering team."
Global Hiring Powers Expansion
Nexthop opened a Burnaby office and hosts career fairs for software engineers. Bengaluru events signal India scaling. SONiC Governing Board membership and Broadcom partnerships on Tomahawk 6 and Thor 800G NIC advance product roadmaps. Awards like TechCrunch Disruptors60 underscore momentum.