VIAVI (VIAV) Q4 2025: Data Center Ecosystem Lifts Revenue 15%, Offsetting Wireless Drag
VIAVI’s Q4 marked a clear inflection as data center ecosystem and aerospace & defense now drive nearly half of NSE revenue, counterbalancing ongoing wireless and cable softness. Management’s guidance signals muted seasonality ahead, with fiber and lab demand reshaping the company’s revenue mix and margin profile. Investors should monitor the pace of service provider recovery and integration of new M&A assets as VIAVI pivots toward higher-growth verticals.
Summary
- Data Center Ecosystem Expansion: Data center and aerospace & defense now comprise about half of NSE revenue.
- Seasonality Muted by Segment Mix: Strong Q1 guide reflects less reliance on legacy service provider cycles.
- Margin Recovery in Focus: Leadership targets mid-teens NSE margins as segment mix improves.
Performance Analysis
VIAVI closed fiscal 2025 with revenue growth at the high end of expectations, driven by robust demand from the data center ecosystem—which includes semiconductor, optical module, and hyperscale operators—and continued strength in aerospace & defense (A&D). NSE (Network and Service Enablement) revenue rose nearly 15% year over year, with gross margin stable at 62% and operating margin improving to 4.7% as the business mix shifted toward higher-value lab and production products. OSP (Optical Security and Performance) also delivered a 17% revenue lift, benefiting from anti-counterfeiting products and a normalization of inventory levels across the industry.
EPS and operating margins both landed at the upper end of guidance, with full-year operating margin up 270 basis points to 14.2%. Cash flow from operations remained solid, and VIAVI ended the year with $429 million in cash, supporting both organic investment and recent M&A activity. Capital allocation prioritized strategic acquisitions, notably Inertia Labs and the pending Spirent business lines, while share repurchases were modest.
- Segment Mix Shift: NSE now derives only 50% of revenue from traditional service providers, down from 90% several years ago, with data center at 30% and A&D at 20%.
- Wireless and Cable Lag: Wireless infrastructure test demand remains weak, with recovery timelines pushed further out.
- Margin Leverage: Operating margin recovery is underway, with management targeting a return to mid-to-high teens as the mix improves.
Leadership’s guidance for Q1 2026 projects sequential revenue growth, defying historical softness, as data center and A&D demand offset legacy seasonality. Tariff impacts were fully mitigated in Q4 and are now embedded in pricing and supply chain strategy.
Executive Commentary
"Fiscal 25 ended on a strong note with VIAVI revenue and EPS coming at the high end of our guidance. NSC revenue in fiscal Q4 grew approximately 15% year over year, primarily driven by strong demand from the data center ecosystem and aerospace and defense customers... We expect the strong demand from the data center ecosystem to continue well into calendar 26."
Oleg Saikin, President and CEO
"Operating margin for the full year was 14.2%, up 270 basis points from fiscal year 2024, and was driven by higher revenue and favorable product mix, resulting in a higher fall through... In fiscal year 2025, we prioritized our capital allocation towards M&A with the acquisition of Inertia Labs and the pending acquisition of Spirant's high-speed Ethernet, network security, and channel emulation business lines."
Ilan Daskal, Chief Financial Officer
Strategic Positioning
1. Data Center Ecosystem as Growth Anchor
Data center-related revenue now comprises 30% of NSE, up sharply from under 20% just a year ago. VIAVI’s leadership in 1.6 terabit test solutions and broadening field instrumentation penetration among hyperscalers are expanding its relevance across the value chain, from semiconductor partners to module vendors and data center operators. Management expects this segment to outpace legacy service provider growth and potentially become the company’s largest vertical within several years.
2. Aerospace & Defense Momentum
Aerospace & defense now delivers 20% of NSE revenue, buoyed by high demand for positioning, navigation, and timing products. The Inertia Labs acquisition is exceeding its $50 million run-rate target, and the segment is characterized by design-win driven, predictable linear orders—providing stability and visibility even as other segments remain cyclical.
3. Muted Seasonality, Diversified Revenue Mix
Legacy seasonality is being offset by counter-cyclical data center and A&D demand, leading to more balanced quarterly revenue. Service provider spend, once the main driver of volatility, now accounts for just 50% of NSE, with management expecting further declines in relative share as growth verticals expand.
4. Margin Recovery and Operating Leverage
NSE margins are recovering from post-telecom downturn lows, with gross margins stable in the low 60% range and a path back to mid-to-high teens operating margin as volume and mix improve. Management sees potential for >20% operating margin in NSE as the business scales and field instruments recover.
5. M&A and Capital Allocation Strategy
Capital deployment is shifting toward strategic M&A, with recent and pending acquisitions (Inertia Labs, Spirent business lines) broadening VIAVI’s portfolio. Share repurchases remain secondary as the company prioritizes growth and integration of new assets. A $600 million term loan B will fund the Spirent transaction and general purposes, with a leverage target below 3x net over time.
Key Considerations
VIAVI’s Q4 marks a structural shift in business mix, with data center and aerospace & defense now driving growth and offsetting ongoing wireless and cable market softness. Investors must weigh the durability of these new engines against legacy cyclicality and integration risk.
Key Considerations:
- Data Center Ecosystem Demand: Strong AI and cloud capex cycles are fueling outsized growth, but visibility beyond 2026 remains uncertain.
- Service Provider Recovery Pace: Fiber investment from North American and European carriers is expected to accelerate, but timing and magnitude remain variable.
- Wireless and Cable Weakness: Wireless infrastructure test remains a drag, with no near-term recovery catalysts.
- Margin Expansion Path: Mix shift and cost discipline are driving margin gains, but full recovery to pre-2022 levels requires sustained volume and integration success.
- Tariff and Supply Chain Adaptation: Recent tariff headwinds have been mitigated, but global trade dynamics remain a watchpoint.
Risks
Key risks include: potential pullback in data center capex, delays in service provider fiber rollouts, and execution risk around recent M&A integration. Wireless and cable remain structurally challenged, and margin recovery is contingent on mix and volume improvement. Tariff or regulatory shifts could reintroduce volatility to cost structure or pricing power.
Forward Outlook
For Q1 2026, VIAVI guided to:
- Revenue of $290 to $298 million (sequentially up, defying typical Q1 softness)
- Operating margin of 15% plus or minus 40 basis points
- EPS of $0.13 to $0.14
For full-year 2026, management did not provide explicit annual guidance but emphasized:
- Continued strength in data center and A&D expected to offset legacy cyclicality
- Pending Spirent acquisition not included in Q1 guide, expected to close by end of September
Management highlighted that seasonality will be more muted, and mix shift should drive further margin and revenue stability as the year progresses.
Takeaways
VIAVI’s Q4 demonstrates a fundamental pivot, with new verticals driving growth and margin leverage. The mix shift toward data center and aerospace & defense is structurally de-risking the business, but investors should monitor the pace of legacy recovery and integration of new assets.
- Growth Engines Outpace Legacy: Data center and A&D are now the primary drivers of revenue and stability, offsetting wireless and cable drag.
- Margin Expansion Relies on Execution: Ongoing mix improvement and cost controls are key, but scale and integration remain critical for full recovery.
- 2026 Outlook Hinges on Capex Cycles: Watch for changes in AI/cloud investment and service provider fiber deployments as leading indicators.
Conclusion
VIAVI’s business model is evolving rapidly, with new growth vectors reshaping its revenue and margin profile. Sustained execution in data center, A&D, and successful M&A integration will determine whether the company can fully realize its margin and growth ambitions in 2026 and beyond.
Industry Read-Through
VIAVI’s results signal a broader industry pivot as test and measurement providers increasingly rely on AI-driven data center and aerospace & defense demand to offset legacy telecom and wireless cyclicality. Hyperscale and fiber capex are now the primary growth engines for the sector, while wireless infrastructure remains a laggard. Tariff mitigation and supply chain adaptation are now table stakes for global players. Peers may face similar mix shifts and must invest in next-gen test solutions to capture emerging verticals as traditional service provider spend plateaus.