Seagate's Blowout Beat

Seagate reported fiscal Q4 2026 adjusted EPS of $5.71 on revenue of $3.63 billion, crushing consensus estimates of $5.09 and $3.48 billion . Non-GAAP gross margin hit 52.7%, up from 37.9% a year ago, marking the 13th consecutive quarter of margin expansion . Management issued bullish FQ1 2027 guidance of $4.1 billion in revenue, citing robust AI-driven demand for high-capacity enterprise hard drives with supply orders already extending into 2029 . Revenue grew 48% year-over-year, and free cash flow reached a record $3.1 billion for the full fiscal year .

Microsoft's Huge Q4

On July 29, Microsoft reported Q4 revenue of $90 billion (up 18% YoY) and adjusted EPS of $4.74, beating estimates of $4.24 on $87.61 billion . Azure revenue grew 43% for the quarter, crossing $100 billion for the full fiscal year, reinforcing the AI-cloud capex cycle that directly feeds memory demand . Microsoft Cloud revenue reached $59.3 billion for the quarter, up 27% . The stock rose more than 8% in after-hours trading .

Magnitude of the Rally

The moves were striking across the entire memory and storage ecosystem:

• SanDisk surged 22% to become the top S&P 500 gainer .
• Western Digital jumped 18% .
• Micron climbed 15% to $851.56 .
• Seagate gained 16% .
• SK Hynix (U.S. listing) rose 16% .
• The Roundhill DRAM Memory ETF (DRAM) rose 13%, confirming the move spanned the entire memory/storage ecosystem .

Samsung Electronics itself (005930.KS) — despite the record profit — saw its stock fall 7% on profit-taking concerns, but the sector-wide read-through from its results was overwhelmingly positive .

Asian Market Spillover

Samsung's official results on July 30, combined with the U.S. tech rally, lifted sentiment across Asian semiconductor names, including SK Hynix and other Korea- and Japan-listed memory plays. The SK Hynix U.S. IPO pricing was viewed as a key test for the AI-memory trade . The broader memory upcycle has seen global monthly memory sales reach a record $74.6 billion, surging 31.7% month-on-month and running above the 10-year seasonal average, according to UBS's July Memory Monthly report .

What Tempered the Gains

Fed Policy Uncertainty

Markets remained cautious about the path of interest rates, with the Fed's next meeting looming and persistent inflation data keeping rate-cut expectations uncertain.

Geopolitical Risks

A prior relief rally on July 27 was partly attributed to reports that U.S.-Iran hostilities had paused , but the broader geopolitical backdrop — including U.S.-China tech tensions and the risk of further export controls on semiconductors — continued to cap risk appetite.

Valuation Overhang

The rally followed weeks of heavy selling in high-flying memory stocks , and some analysts flagged that even after the rebound, the sector remains priced for a perfect AI demand scenario with little room for error. The paradox of Samsung's own stock falling 7% after its record profit illustrated the tension: investors celebrated the sector's trajectory but questioned how much was already priced in .

Key Takeaway

The Thursday rally was fundamentally driven — three consecutive earnings reports (Seagate, Microsoft, Samsung) all confirmed that AI-driven memory demand is accelerating, not slowing. Samsung's warning about tightening memory supplies further boosted pricing power expectations . However, the broader macro and geopolitical environment, combined with stretched valuations, kept the rally from running unchecked. Investors bought the fundamentals but hedged on the outlook.

Seagate's Blowout Beat

Seagate reported fiscal Q4 2026 adjusted EPS of $5.71 on revenue of $3.63 billion, crushing consensus estimates of $5.09 and $3.48 billion . Non-GAAP gross margin hit 52.7%, up from 37.9% a year ago, marking the 13th consecutive quarter of margin expansion . Management issued bullish FQ1 2027 guidance of $4.1 billion in revenue, citing robust AI-driven demand for high-capacity enterprise hard drives with supply orders already extending into 2029 . Revenue grew 48% year-over-year, and free cash flow reached a record $3.1 billion for the full fiscal year .

Microsoft's Huge Q4

On July 29, Microsoft reported Q4 revenue of $90 billion (up 18% YoY) and adjusted EPS of $4.74, beating estimates of $4.24 on $87.61 billion . Azure revenue grew 43% for the quarter, crossing $100 billion for the full fiscal year, reinforcing the AI-cloud capex cycle that directly feeds memory demand . Microsoft Cloud revenue reached $59.3 billion for the quarter, up 27% . The stock rose more than 8% in after-hours trading .

Magnitude of the Rally

The moves were striking across the entire memory and storage ecosystem:

• SanDisk surged 22% to become the top S&P 500 gainer .
• Western Digital jumped 18% .
• Micron climbed 15% to $851.56 .
• Seagate gained 16% .
• SK Hynix (U.S. listing) rose 16% .
• The Roundhill DRAM Memory ETF (DRAM) rose 13%, confirming the move spanned the entire memory/storage ecosystem .

Samsung Electronics itself (005930.KS) — despite the record profit — saw its stock fall 7% on profit-taking concerns, but the sector-wide read-through from its results was overwhelmingly positive .

Asian Market Spillover

Samsung's official results on July 30, combined with the U.S. tech rally, lifted sentiment across Asian semiconductor names, including SK Hynix and other Korea- and Japan-listed memory plays. The SK Hynix U.S. IPO pricing was viewed as a key test for the AI-memory trade . The broader memory upcycle has seen global monthly memory sales reach a record $74.6 billion, surging 31.7% month-on-month and running above the 10-year seasonal average, according to UBS's July Memory Monthly report .

What Tempered the Gains

Fed Policy Uncertainty

Markets remained cautious about the path of interest rates, with the Fed's next meeting looming and persistent inflation data keeping rate-cut expectations uncertain.

Geopolitical Risks

A prior relief rally on July 27 was partly attributed to reports that U.S.-Iran hostilities had paused , but the broader geopolitical backdrop — including U.S.-China tech tensions and the risk of further export controls on semiconductors — continued to cap risk appetite.

Valuation Overhang

The rally followed weeks of heavy selling in high-flying memory stocks , and some analysts flagged that even after the rebound, the sector remains priced for a perfect AI demand scenario with little room for error. The paradox of Samsung's own stock falling 7% after its record profit illustrated the tension: investors celebrated the sector's trajectory but questioned how much was already priced in .

Key Takeaway

The Thursday rally was fundamentally driven — three consecutive earnings reports (Seagate, Microsoft, Samsung) all confirmed that AI-driven memory demand is accelerating, not slowing. Samsung's warning about tightening memory supplies further boosted pricing power expectations . However, the broader macro and geopolitical environment, combined with stretched valuations, kept the rally from running unchecked. Investors bought the fundamentals but hedged on the outlook.