AI Infrastructure: The 'Plumbing' Plays Powering the Next Growth Wave

The artificial intelligence boom is expanding beyond large-cap chipmakers and software developers into the physical infrastructure—the 'plumbing'—required to sustain massive computing loads. This shift highlights a growing opportunity in the 'pick-and-shovel' sector, where companies providing printed circuit boards, fiber networks, and power systems are seeing increased demand from hyperscale data centers and government-led broadband initiatives. TTM Technologies (TTMI) exemplifies this trend, reporting 57% year-over-year growth in its data center computing segment in late 2025, with management guiding for a further 66% increase in Q1 2026. The company also maintains a significant $1.61 billion aerospace and defense backlog, which includes a $200 million multiyear supply contract with Raytheon. Other players are pivoting to address specific bottlenecks in the AI stack. Bel Fuse (BELFB) has reorganized its business units to focus on aerospace, defense, and industrial technology, recently acquiring Methode Electronics' dataMate copper transceiver business to strengthen its position in high-density data center power delivery. Connectivity providers are also seeing tailwinds from federal spending. Calix (CALX) has integrated Google Cloud's Vertex AI and Gemini models into its platform, while Clearfield (CLFD) has launched the NOVA Platform for hyperscale data centers. Clearfield's target market is projected to grow from $19.1 billion in 2022 to $29.7 billion by 2026, representing a 13.1% compound annual growth rate, driven largely by the BEAD program's broadband deployment funds. While execution risks remain for smaller infrastructure firms, the rotation into real-economy growth suggests a broadening of the AI trade. Investors are increasingly looking at the physical constraints of AI, such as power and connectivity, as the next primary drivers of value.