Lumentum vs. Amphenol: Which AI Connectivity Stock is the Better Buy?

Lumentum LITE and Amphenol APH have emerged as key suppliers to the AI data center ecosystem. Both are positioned at critical points in the infrastructure stack that enable large-scale AI workloads. Surging hyperscaler capital expenditure has been a shared tailwind, lifting demand for high-speed connectivity solutions across the board.

Lumentum operates through optical components that move data across longer distances within and between data centers. Amphenol provides the electronic and fiber interconnects that handle power delivery and shorter-range transmission. As data center architectures evolve, the focus shifts to which connectivity layer offers greater scalability and long-term economic potential. Let us delve deep to determine which one is a better investment now.

The Case for LITE

Lumentum occupies a foundational role in the AI data center supply chain, manufacturing the optical and photonic components that keep high-speed networks running efficiently. Its product suite covers Electro-absorption Modulated Laser chips (EML), cloud transceivers, optical circuit switches (OCS) and co-packaged optics (CPO), collectively enabling the data movement that large-scale AI workloads depend on. Demand for these components has moved from cyclical to structural as hyperscalers embed LITE's technologies across their core infrastructure roadmaps.

The transceiver business is emerging as a near-term catalyst. The ramp in 800G products is well underway, while the move to 1.6T is arriving faster than the industry had anticipated. Higher-margin 200-gigabit-per-lane EMLs are capturing a growing share of this transition, positioning Lumentum to expand both its top line and margins as the product mix continues to upgrade. OCS is adding to this momentum, with the order backlog crossing $400 million across a diversified hyperscaler customer base.

CPO is gaining traction, with commercial orders already in place for the first half of 2027. Optical scale-up is expected to displace copper connectivity within AI clusters and represents a significant untapped addressable market from late 2027 onward.

Fiscal second-quarter revenues of $665.5 million grew 65.5% year over year, while the fiscal third-quarter guidance of $780 million to $830 million points to a business where each product cycle is adding a fresh layer of revenue. The Zacks Consensus Estimate pegs LITE's fiscal 2026 EPS at $7.7, up by 7 cents over the past 30 days and indicating year-over-year growth of 273.79%.

Lumentum Holdings Inc. Price and Consensus

Lumentum Holdings Inc. price-consensus-chart | Lumentum Holdings Inc. Quote

The Case for APH

Amphenol is a diversified interconnect solutions provider supplying the electronic and fiber optic components that enable power delivery and high-speed data transmission across AI data centers, communications networks and industrial systems. Its portfolio spans copper interconnects, fiber optic cables and sensor solutions, serving a broad range of end markets that insulate the business from over-dependence on any single vertical.

The IT datacom segment has emerged as Amphenol's near-term catalyst, fueled by sustained hyperscaler investment in AI infrastructure. The acquisition of CommScope's connectivity business expands APH's fiber optic capabilities, allowing it to address the full interconnect spectrum within next-generation data centers. This breadth of offering, spanning copper, fiber and power delivery, is increasingly relevant as data center architects navigate complex technology trade-offs across every new system generation. While CommScope is expected to contribute approximately $4.1 billion in 2026 revenues, its high-teens operating margin profile is expected to weigh modestly on near-term profitability as it scales within the Amphenol fold.

However, Amphenol's broad end market exposure, while a structural strength, also tempers the pace of AI-driven growth. Segments such as mobile devices and automotive face near-term cyclical pressure, diluting the impact of the strong IT datacom momentum on overall earnings growth.

The Zacks Consensus Estimate pegs APH's 2026 EPS at $4.32, up 8 cents over the past 30 days and reflecting year-over-year growth of 29.34%.

Amphenol Corporation Price and Consensus

Amphenol Corporation price-consensus-chart | Amphenol Corporation Quote

Price Performance and Valuation of LITE and APH

Over the trailing six months, LITE shares have surged 370% against APH's modest 5.8% return. Lumentum's outperformance reflects a business where accelerating revenue momentum, expanding backlogs and deepening hyperscaler relationships are translating directly into market recognition. Amphenol's modest appreciation reflects that while its AI exposure is real, the market recognizes that it remains one growth driver within a much larger and more diversified business.

LITE vs. APH Price Performance

Image Source: Zacks Investment Research

LITE trades at a price-to-sales ratio of 12.95x compared to APH's 5.02x. Lumentum's premium reflects the market's recognition of its structural hyperscaler relationships and a product portfolio where each cycle adds a compounding revenue layer. Amphenol's lower multiple is consistent with its more diversified earnings profile.

LITE vs. APH Valuation

Image Source: Zacks Investment Research

Conclusion

Lumentum's structural hyperscaler relationships, multi-product growth roadmap and accelerating revenue momentum position it as a pure-play beneficiary of the AI optical connectivity buildout, with the bulk of its growth catalysts still ahead. Amphenol's diversified business model and broad end market presence make it a resilient holding for investors who value stability and consistent execution across market cycles.

With LITE sporting a Zacks Rank #1 (Strong Buy) against APH's Zacks Rank #3 (Hold), Lumentum emerges as the more compelling pick at this juncture. You can see the complete list of today's Zacks #1 Rank stocks here.

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This article originally published on Zacks Investment Research (zacks.com).

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