Kla (KLAC) Q4 2025 earnings review
AI & Advanced Packaging Fuel Record Quarter; Guidance Points to Stable Growth
KLA delivered a strong finish to its fiscal year, beating revenue and EPS guidance for Q4. Results were driven by sustained, strong investment in AI infrastructure, particularly in leading-edge foundry/logic and High-Bandwidth Memory (HBM). The standout performer was the advanced packaging business, where management again raised its forecast for calendar 2025 to over $925 million, highlighting a powerful new growth vector. The company also generated a record $1.07 billion in quarterly free cash flow. Guidance for Q1 FY26 of ~$3.15 billion in revenue indicates a stable business environment at these elevated levels, though the YoY growth rate is moderating from the peaks seen in mid-FY25.
🐂 Bull Case
The buildout for AI infrastructure is structurally increasing the need for KLA's tools. Management notes that larger die sizes, Gate-All-Around architectures, and HBM complexity are all driving higher process control intensity, which supports KLA's outperformance versus the broader WFE market.
The company's advanced packaging business is inflecting sharply, with the CY25 revenue forecast raised for a second consecutive quarter to over $925 million, representing ~85% YoY growth from CY24's expected $500M+. This provides a significant new growth driver outside of traditional WFE.
Record quarterly free cash flow of $1.07 billion demonstrates the power of the operating model. This enables aggressive capital returns, including a recently increased dividend and a new $5 billion share repurchase authorization, signaling management's confidence.
🐻 Bear Case
While revenues are at record levels, the pace of growth is slowing. YoY revenue growth peaked at 30% in Q3'25, fell to 24% in Q4, and is guided to decelerate further to ~11% in Q1'26, suggesting the period of rapid acceleration has passed.
The company guided for a 50-100 basis point headwind to gross margin from global tariffs. While less than initially feared, it represents a direct impact on profitability. The broader China trade situation remains a persistent risk.
Remaining Performance Obligation (RPO) is expected to decline by ~$1 billion sequentially as lead times normalize from over 18 months to a more typical 7-9 month range. While explained as operational normalization, a declining backlog could be viewed negatively.
⚖️ Verdict: 🟢
Bullish. The evidence for a structural increase in process control intensity driven by AI is compelling and outweighs the concern of a moderating growth rate. The explosive growth in the advanced packaging segment provides a significant, high-margin growth vector that is not fully appreciated. While geopolitical risks are present, the company's strong execution and cash generation position it well to navigate them.
Key Themes
Advanced Packaging Revenue Forecast Raised Again
KLA's opportunity in advanced packaging continues to accelerate. Management raised its calendar 2025 systems revenue forecast for the segment to over $925 million. This is up from the $850 million estimate given just last quarter and the ~$500 million expected for calendar 2024. CEO Rick Wallace noted, 'we think we're closer to at the beginning of this trend than at the end of it,' suggesting a long runway for growth as AI chip complexity increases.
Process Control Intensity Structurally Increasing
The narrative that AI is driving a fundamental increase in demand for KLA's tools was validated. Management noted that HBM's unique characteristics (bigger die, more complex logic circuitry, less redundancy) increase DRAM process control intensity by over 100 basis points compared to pre-EUV levels. Similarly, the move to 2nm logic is expected to increase KLA's share of WFE by 90-100 basis points versus the 3nm node. This trend decouples KLA's growth from overall WFE spending.
Services Business Remains a Pillar of Strength
The highly profitable Services business delivered its 52nd consecutive quarter of year-over-year growth, with revenue rising 14% to $703 million. This segment provides a predictable, recurring revenue stream that is bolstered by a growing installed base and customer requirements for high tool availability in complex manufacturing environments.
YoY Growth is Decelerating
While the absolute results are strong, the growth trajectory is moderating. Q1 FY26 revenue guidance of $3.15B implies a 10.8% YoY growth rate. This is a significant step down from the 23.6% growth in Q4 FY25 and the 30.0% peak seen in Q3 FY25. This indicates the business is transitioning from a period of rapid acceleration to one of more stable, moderate growth.
Tariff and Geopolitical Headwinds Persist
Management quantified the impact of global tariffs, guiding for a 50-100 basis point headwind to gross margin in the September quarter. While this is an improvement from the 100 bps feared last quarter, it remains a tangible drag on profitability. Broader geopolitical risks related to China, which is expected to comprise ~30% of revenue in CY25, also remain a key investor concern.
Lagging Performance in Non-Core Segments
Contradicting the strong overall growth narrative, non-core segments are lagging. In Q4, the PCB and Component Inspection segment grew only 10.0% YoY, and the Specialty Semiconductor Process segment grew 17.4% YoY. Both are well below the core Semiconductor Process Control segment's growth of 24.7%. This divergence is consistent with prior impairment charges taken against the PCB business due to a deteriorating long-term forecast.
Other KPIs
Accelerating. The company generated a record $1.065 billion in free cash flow, up from $990 million in Q3 and $832 million in the year-ago quarter. For the full fiscal year, FCF was $3.75 billion, representing a strong 31% margin. This robust cash generation underpins the company's aggressive dividend growth and share repurchase programs.
Reversing. RPO is expected to be ~$7.9 billion when the 10-K is filed, down from ~$8.9 billion in the prior quarter. Management stressed this decline is not from cancellations but from a healthy normalization of lead times as supply constraints ease, with the business moving from a >18 month backlog to a more typical 7-9 month visibility.
Stable. This core segment grew 24.7% YoY, driving nearly all of the company's growth. The other two segments, Specialty Semi ($142M) and PCB/Component Inspection ($154M), remain small contributors and are growing at a slower pace.
Guidance
Decelerating. The midpoint implies a 10.8% YoY growth rate, a clear slowdown from the 23.6% growth reported in Q4. Sequentially, revenue is expected to be roughly flat (-0.8%), indicating a stabilization of business at these historically high levels.
Decelerating. The midpoint of $8.53 represents a 16.4% YoY increase. While still strong, this is a moderation from the 42.1% growth achieved in Q4. The guidance reflects stable revenue and a slight compression in guided gross margin.
Stable. The guided margin is down from 63.2% achieved in Q4 but is impacted by a 50-100 basis point headwind from tariffs. Management reiterated its expectation for full calendar year 2025 gross margins to be approximately 62.5%, suggesting a stronger mix in the second half of the calendar year.