Seagate's Mozaic 3+ Ramp Gains Momentum Across Global CSPs

Seagate Technology (STX) is experiencing strong momentum with its Mozaic 3+ HAMR platform, securing qualifications from major cloud service providers and driving record non-GAAP gross margins of 37.9% and operating margins of 26.2% in Q4. The company's nearline shipments increased 52% year-over-year, and it plans to introduce Mozaic 4+ drives with up to 44TB capacity in fiscal 2026, reinforcing its leadership in high-capacity, energy-efficient storage crucial for AI and cloud expansion, despite competition from Western Digital and Pure Storage.

Analysis

Seagate Technology (STX) is demonstrating significant momentum with its Mozaic 3+ HAMR platform, securing qualifications from three major cloud service providers (CSPs) and expanding shipments to more cloud customers. This technological transition has proven financially accretive, contributing to record non-GAAP gross margins of 37.9% and operating margins of 26.2% in the fiscal fourth quarter. The company's nearline shipments surged 52% year-over-year to 137 exabytes in the June quarter, driven by strong demand for its 24TB and 28TB PMR platforms.

The Mozaic platform, designed to meet surging demand from AI and cloud storage expansion, is poised to be a cornerstone of Seagate's mass-capacity growth strategy. Management plans to initiate qualification for the higher-capacity Mozaic 4+ drives (up to 44TB) in the first half of fiscal 2026, reinforcing its leadership in energy-efficient, high-capacity storage. Furthermore, Seagate's build-to-order model has committed nearline production capacity through mid-2026, indicating robust customer confidence and supply reliability.

Despite strong internal performance, Seagate operates in a highly competitive market, facing rivals like Western Digital (WDC), which shipped over 1.7 million units of 26TB and 32TB drives, and Pure Storage (PSTG), reporting 13% YoY revenue growth in Q2 FY26 with its all-flash solutions. However, STX shares have outperformed, gaining 123.5% over the past year compared to the industry's 53.6%. The stock trades at a forward P/E of 21.76x, below the industry average of 24.09x, and fiscal 2026 earnings estimates have been revised up 2.04% to $10.51.

Key Decisions for Investors

• Consider Seagate's strong product cycle and margin expansion driven by the Mozaic platform as a key driver for continued performance.
• Monitor competitive developments from Western Digital and Pure Storage, particularly their advancements in high-capacity and flash-based solutions, and global macroeconomic conditions for potential supply chain disruptions.
• Evaluate STX's current valuation, which appears favorable relative to its industry peers, alongside the positive revisions to fiscal 2026 earnings estimates and its Zacks #2 (Buy) Rank.