Ayar Labs announced Tuesday via BusinessWire the closing of a $500 million Series E at a $3.75 billion post-money valuation. The lead investor is Neuberger Berman. The notable detail isn’t the size.
Nvidia and AMD, which compete directly on GPU architecture, are both in the round. So are MediaTek, Qatar Investment Authority, ARK Invest, Insight Partners, Sequoia Global Equities, Alchip, and 1789 Capital. When the two dominant GPU makers fund the same optical interconnect startup, the implicit message is that they both see copper wiring as a coming bottleneck — and aren’t certain their own roadmaps solve it.
Ayar Labs claims its TeraPHY chiplets deliver meaningful bandwidth and energy efficiency improvements over copper interconnects. These are company performance claims and have not been independently verified through public third-party benchmarking. The Wall Street Journal reported a slightly higher valuation figure of $3.8 billion; the company’s own press release cites $3.75 billion post-money.
Co-packaged optics is the technical bet. As AI model sizes grow and cluster densities increase, GPU-to-GPU communication becomes a serious engineering constraint. Copper handles today’s workloads. Whether it scales to tomorrow’s is the open question this round is essentially betting against. Neuberger Berman’s managing director suggested the company could pursue an IPO in the near future — a signal from investors, not a confirmed filing.
When two of your biggest potential customers each put money into your Series E, the product validation question mostly answers itself. What remains is the manufacturing timeline question. Optical interconnects at scale face production complexity that copper doesn’t. Ayar’s IPO window depends on how fast that gap closes.