SoftBank's Strategic AI Investment Targets Critical Hardware Bottleneck

SoftBank invests in Kandou AI's high-speed interconnect hardware, expanding its AI stack as credit concerns grow following major OpenAI and data center bets.

SoftBank Group Corp. continues its methodical expansion across the artificial intelligence value chain, with its latest capital allocation focusing on a less visible but increasingly vital hardware layer: the interface linking processors and memory.

A Strategic Investment in Connectivity

On March 23, SoftBank participated in a $225 million Series A funding round for semiconductor startup Kandou AI. The financing, which was oversubscribed and led by Maverick Silicon, also attracted investment from Synopsys, Cadence Design Systems, and Alchip Technologies. This investment values the startup at $400 million.

Kandou AI specializes in high-speed interconnect technologies designed to address a specific and growing challenge. As AI models scale in size and complexity, graphics and central processing units (GPUs and CPUs) require exponentially more bandwidth to access ever-larger memory pools. The company’s patented signaling and SerDes (Serializer/Deserializer) technologies aim to make data transfer over copper connections far more efficient, delivering greater bandwidth with reduced power consumption. Since CEO Srujan Linga assumed leadership in 2025, the company, founded in 2011, has pivoted its focus decisively from consumer electronics to core AI infrastructure.

Filling Out the AI Stack

This move into interconnect hardware complements SoftBank’s existing strategic positions in AI. Through its Vision Fund, the Japanese conglomerate already holds an 11% stake in OpenAI. The investment in Kandou AI adds a foundational component directly targeting the physical infrastructure of large-scale AI computing clusters.

The fresh capital is intended to scale production of Kandou’s high-performance connectivity chips, expand partnerships with major hyperscale cloud providers, and advance its intellectual property portfolio for multi-terabit connections.

Notably, this deal coincides with the groundbreaking of SoftBank’s massive $33 billion data center project in Ohio. The facility, being built on a former uranium enrichment site, is projected to deliver up to 9.2 gigawatts of power in the long term.

Credit Profile Under Scrutiny

The company’s aggressive investment strategy is drawing attention to its financial resilience. Following a revision of SoftBank’s credit outlook from stable to negative by S&P Global Ratings—prompted by an additional $30 billion investment in OpenAI—the firm’s credit default swaps (CDS) widened to an 11-month high. SoftBank now carries the widest CDS spreads among major Japanese corporations. S&P indicated that restoring asset liquidity and portfolio quality may take longer than previously anticipated.

The Kandou AI transaction underscores the consistency of SoftBank’s approach to building a comprehensive presence across the entire AI stack, from foundational models and data centers down to the chip level. Whether the company’s credit profile can keep pace with this ambitious strategy remains a pivotal question for bondholders and rating agencies in the coming quarters.