Seagate Technology Surges 18% Pre-Market to New High, Semiconductor Stocks Broadly Rise, Can You Still Chase the Rally?

TradingKey - On April 29, Eastern Time, storage chip leader Seagate Technology ( STX) saw its pre-market stock price surge over 18% to $684, hitting a new all-time high. Earnings and current-quarter guidance exceeded Wall Street expectations across the board; combined with the continued heating up of AI-driven data center storage demand, this directly triggered a broad rally in storage concept stocks.

As of pre-market on April 29, Seagate's stock price has soared from a 52-week low of approximately $63 to around $680, a cumulative gain of over 978%, recording positive returns for 24 consecutive trading days since March 17.

Boosted by its financial results, Western Digital ( WDC.US) rose more than 10% in pre-market trading, and Silicon Motion ( SIMO) skyrocketed over 30% after its second-quarter revenue guidance beat expectations. SanDisk ( SNDK.US) rose over 5%, while Micron Technology ( MU.US) gained nearly 4%. The storage sector saw a near-universal rally, as the market once again validated the robust demand across the AI hardware industry chain.

Earnings and guidance significantly beat expectations; capacity crunch emerges as core signal.

Seagate reported fiscal third-quarter 2026 revenue of $3.11 billion, a 44% year-over-year increase that topped market expectations of $2.96 billion; adjusted earnings per share were $4.10, also significantly beating the $3.50 estimate. Adding to the market's excitement was the Q4 guidance, which projects revenue of $3.45 billion and adjusted EPS of approximately $5, both of which surpass the analyst consensus of $3.97.

The company has raised its annual revenue growth target to at least 20% above the original target, driven by the exponential expansion of storage bandwidth demand from AI data centers. Management shared a rare update during the earnings call, noting that its high-end storage capacity is almost entirely pre-booked through fiscal year 2027.

HAMR technology becomes the core of its valuation.

The core engine behind Seagate Technology’s recent surge is its industry-leading HAMR (Heat-Assisted Magnetic Recording) technology. As traditional hard drives hit a bottleneck with storage density approaching physical limits, HAMR technology significantly increases storage capacity per disk without sacrificing speed.

This characteristic perfectly meets the essential demand for high-capacity storage in AI data centers. As management pointed out in the latest earnings report, the cost-performance advantage provided by HAMR technology is being steadily converted into market share gains in the AI data center space.

Are there still buying opportunities in the semiconductor sector?

Seagate’s structural growth narrative continues to strengthen. The CEO officially announced during the earnings call that the annual revenue growth target for the coming years has been raised from the previous “low-to-mid double digits” to “at least 20%.” On the competitive front, Seagate’s HAMR technology advantage is being converted into excess profit margins. Non-GAAP gross margin reached 47%, surging 480 basis points from the previous quarter, with free cash flow nearing $1 billion.

As for the threat of SSDs replacing HDDs, current cost concerns in AI data centers ensure that hard disk drives remain in high demand. The storage cost per GB for HDDs is approximately one-tenth that of SSDs, making it difficult for mechanical hard drives to be replaced in bulk in the short term.

Barclays analysts emphasized in a rating upgrade that since the explosion of AI demand, HDD shipment capacity growth has continued to accelerate, rising from approximately 10% in 2024 to 26% in 2025, with further acceleration expected in 2026.

Institutional ratings for Seagate are highly consistent, with most firms raising their target prices. Among them, Citi is the most aggressive, hiking its target price directly from $595 to $740. Nevertheless, the highest target price on Wall Street is only $740, while Seagate's pre-market share price has already surged above $680. Even with Citi’s $740 target, the implied upside is less than 10%.

For investors with a higher risk appetite, the “ceiling” for SanDisk within the storage sector is further away. Analysts have set a future average target price of $1,100, offering over 20% upside from current levels. Furthermore, SanDisk focuses on the NAND solid-state storage field, which has a supply-side substitution relationship with the HDD segment.

For investors seeking a greater margin of safety, a more prudent strategy would be to place Seagate on a watchlist and wait for a better entry point provided by valuation correction or a technical pullback.

Without chasing highs, Western Digital's "laggard" attribute may instead provide a relatively better margin of safety: its gains have been more moderate, and its dual revenue structure of traditional HDD and NAND businesses enjoys a completely different market narrative cycle compared to Seagate.