While the spotlight often shines on cutting-edge chips and sophisticated software in the artificial intelligence (AI) landscape, a hidden network of companies plays an equally vital role in constructing the foundational infrastructure. These unsung heroes are instrumental in ensuring seamless, high-speed, and low-latency communication within and between modern data centers. The market for data center networking is projected to surge from $39.7 billion in 2025 to an impressive $118.9 billion by 2033. Amidst this rapid expansion, several smaller entities are quietly carving out substantial market shares, presenting intriguing prospects for astute investors seeking long-term growth.
Insight into Key AI Infrastructure Contributors
In a dynamic sector driven by escalating AI demands, three companies stand out for their critical contributions to data center evolution: Astera Labs, Celestica, and Fabrinet. These firms, though perhaps not household names, are leveraging their specialized expertise to meet the rigorous demands of an AI-powered future.
Astera Labs is at the forefront of tackling connectivity bottlenecks in cloud and AI environments. Their open-standard PCI Express (PCIe) solutions are gaining widespread adoption for facilitating rapid and efficient data transfer among CPUs, GPUs, memory, and storage within and across AI servers. Their product suite, encompassing Aries retimers, Scorpio switches, Taurus electrical cables, and Leo CXL controllers, collectively minimizes signal degradation and noise in data communications. With a substantial share of the global PCIe retimer market and an addressable market expected to grow from $17.2 billion in 2024 to $27.4 billion in 2027, Astera Labs is strategically positioned. Collaborations with industry giants like Nvidia and Advanced Micro Devices further solidify its role in advancing open, multi-vendor data center architectures. As hyperscalers transition from 400-gigabit to 800-gigabit and even 1.6-terabit networks, the company's mission-critical solutions ensure that the vast data volumes required for complex AI models are handled with unparalleled speed and efficiency.
Celestica, while less prominently featured, is an indispensable partner in the AI infrastructure build-out. This company excels in designing, engineering, and manufacturing essential components, including networking switches, server platforms, and complete rack systems. A significant growth driver for Celestica is the industry's shift to 800G and 1.6T Ethernet interconnects in AI data centers. Given its long-standing partnership with Broadcom, a key provider of Tomahawk 5 switches integral to this transition, Celestica stands to benefit immensely from Broadcom's recent $10 billion custom chip supply agreement with OpenAI. The robust demand has propelled Celestica's Connectivity & Cloud Solutions (CCS) segment revenue by 28% year-over-year in Q2 fiscal 2025, now accounting for 72% of total revenue. The higher-margin Hardware Platform Solutions (HPS) networking business within CCS also experienced an impressive 82% surge in revenue, reaching $1.2 billion. With substantial free cash flow and liquidity, Celestica is well-equipped for future expansion.
Fabrinet plays another crucial, behind-the-scenes role in powering AI infrastructure. They specialize in optical communication devices, such as selective switching products, high-speed transceivers (which convert electrical signals to light and vice versa), interconnects, and advanced optical packaging. This laser-based hardware is critical for achieving the faster, lower-latency server communication demanded by intensive AI workloads. As data centers upgrade their optical links from 800G to 1.6T, Fabrinet's proven capability in maintaining precise thermal control and component alignment within transceivers—a critical challenge at these speeds—positions it uniquely. The company has already begun shipping 1.6T transceivers in volume and anticipates sustained strong demand for both 800G and 1.6T solutions through fiscal 2026. Despite short-term supply chain challenges, Fabrinet recorded a 19% year-over-year revenue increase to $3.4 billion in fiscal 2025, alongside record non-GAAP earnings per share. With notable clients including Nvidia and Cisco Systems, Fabrinet possesses a strong competitive moat in a rapidly expanding market.
The growth trajectory of artificial intelligence is undeniably steep, and the companies providing the underlying infrastructure are positioned for remarkable expansion. For investors with a long-term perspective, focusing on these foundational players offers a compelling strategy to capitalize on the AI boom. Their specialized technologies and strategic market positions suggest that they are not just participants, but essential enablers of the next generation of AI innovation. While their current valuations might appear elevated, the potential for sustained growth, driven by an ever-increasing demand for high-performance data center connectivity, presents a strong case for their inclusion in a forward-looking investment portfolio.
