Why Is Seagate Technology (STX) Stock Down -14.71% Today?
Key Takeaways
- STX shares tumbled roughly 14.71% in Friday's session, erasing about $139 from the prior close.
- The primary catalyst was a Nikkei report that Toshiba plans to double its hard-disk drive (HDD) production capacity for AI data centers by fiscal 2027.
- The move raises concerns that a long stretch of tight HDD supply — and the pricing power it created — could loosen.
- The selloff was concentrated in HDD makers; broader memory and large-cap tech indexes held up comparatively well.
- Traders are now watching Seagate's upcoming earnings and any clarity on Toshiba's expansion timeline.
Opening Summary
Seagate Technology Holdings (STX), a leading maker of hard-disk drives and data storage solutions, saw its stock plunge on Friday after a report that rival Toshiba intends to significantly expand HDD production. The stock fell about 14.71%, closing near $806.52 versus a prior session close of $945.57. The decline was driven squarely by a supply-side competitive threat, as investors reassessed the pricing power that has powered Seagate's standout rally this year.
Catalyst: Toshiba's Plan to Double HDD Capacity
The sharp decline traces to a Nikkei Asia report that Japan's Toshiba plans to invest roughly ¥60 billion (about $380 million) to double its HDD production capacity, centered on a plant in the Philippines, targeting hard drives used in AI data centers by fiscal 2027. Toshiba is the smallest of the three major HDD manufacturers, holding just over 10% of the market by storage capacity, but has signaled a medium-term goal of reaching 30%.
The announcement matters because Seagate and its closest rival WDC have benefited enormously from constrained HDD supply amid the AI-driven data center build-out. Both companies have repeatedly highlighted tight supply as a key source of pricing leverage. A credible plan to flood the market with additional capacity directly threatens that dynamic, prompting investors to reprice Seagate's growth and margin assumptions.
Valuation and Profit-Taking After a Massive Rally
The severity of Friday's decline also reflects how far STX shares had already climbed. Coming into the session, the stock was up more than 200% year to date, leaving it sensitive to any news suggesting the industry's supply-and-demand balance could soften. With Seagate's nearline capacity already substantially allocated through 2027, investors had priced in continued scarcity and strong margins. Toshiba's expansion plan undermined a core pillar of that thesis, triggering an outsized repricing in an extended name.
Market Context and Trading Activity
The move was notably isolated to hard-drive makers. While STX and WDC fell sharply, broader memory names such as MU and SNDK held relatively steady, and large-cap technology benchmarks traded higher. This divergence confirms the selloff was a product-specific reaction rather than a broad risk-off event in the storage or semiconductor sectors. Trading volume was elevated as investors rushed to reposition, and the decline pushed shares below their 50-day moving average, a technical level watched closely by momentum traders.
What Comes Next for STX
Attention now shifts to Seagate's next earnings report, expected in late October, where investors will look for any commentary on supply, pricing, and the competitive landscape. The key uncertainty is timing: Toshiba's added capacity will not reach the market immediately, and long-term customer contracts may cushion near-term results. Still, the market will be watching for signs that the industry's tight supply-and-demand balance is loosening, as well as any response from Seagate and its peers on capacity discipline. Risks include faster-than-expected capacity additions, easing pricing, and continued profit-taking in an extended stock.
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STX in upward trend: 10-day moving average broke above 50-day moving average on September 24, 2026
The 10-day moving average for STX crossed bullishly above the 50-day moving average on September 24, 2026. This indicates that the trend has shifted higher and could be considered a buy signal. In 15 of 18 past instances when the 10-day crossed above the 50-day, the stock continued to move higher over the following month. The odds of a continued upward trend are 83%.
Technical Analysis (Indicators)
Bullish Trend Analysis
The Momentum Indicator moved above the 0 level on October 05, 2026. You may want to consider a long position or call options on STX as a result. In 66 of 80 past instances where the momentum indicator moved above 0, the stock continued to climb. The odds of a continued upward trend are 82%.
The Moving Average Convergence Divergence (MACD) for STX just turned positive on September 21, 2026. Looking at past instances where STX's MACD turned positive, the stock continued to rise in 33 of 47 cases over the following month. The odds of a continued upward trend are 70%.
STX moved above its 50-day moving average on October 05, 2026 date and that indicates a change from a downward trend to an upward trend.
Following a +3.52% 3-day Advance, the price is estimated to grow further. Considering data from situations where STX advanced for three days, in 278 of 351 cases, the price rose further within the following month. The odds of a continued upward trend are 79%.
Bearish Trend Analysis
The Stochastic Oscillator may be shifting from an upward trend to a downward trend. In 43 of 55 cases where STX's Stochastic Oscillator exited the overbought zone, the price fell further within the following month. The odds of a continued downward trend are 78%.
Following a 3-day decline, the stock is projected to fall further. Considering past instances where STX declined for three days, the price rose further in 50 of 62 cases within the following month. The odds of a continued downward trend are 69%.
STX broke above its upper Bollinger Band on September 08, 2026. This could be a sign that the stock is set to drop as the stock moves back below the upper band and toward the middle band. You may want to consider selling the stock or exploring put options.
The Aroon Indicator for STX entered a downward trend on September 23, 2026. This could indicate a strong downward move is ahead for the stock. Traders may want to consider selling the stock or buying put options.
Fundamental Analysis (Ratings)
The Tickeron PE Growth Rating for this company is 7 (best 1 - 100 worst), pointing to outstanding earnings growth. The PE Growth rating is based on a comparative analysis of stock PE ratio increase over the last 12 months compared against S&P 500 index constituents.
The Tickeron SMR rating for this company is 9 (best 1 - 100 worst), indicating very strong sales and a profitable business model. SMR (Sales, Margin, Return on Equity) rating is based on comparative analysis of weighted Sales, Income Margin and Return on Equity values compared against S&P 500 index constituents. The weighted SMR value is a proprietary formula developed by Tickeron and represents an overall profitability measure for a stock.
The Tickeron Price Growth Rating for this company is 10 (best 1 - 100 worst), indicating outstanding price growth. STX’s price grows at a higher rate over the last 12 months as compared to S&P 500 index constituents.
The Tickeron Profit vs. Risk Rating rating for this company is 16 (best 1 - 100 worst), indicating low risk on high returns. The average Profit vs. Risk Rating rating for the industry is 87, placing this stock better than average.
The Tickeron Seasonality Score of 50 (best 1 - 100 worst) indicates that the company is fair valued in the industry. The Tickeron Seasonality score describes the variance of predictable price changes around the same period every calendar year. These changes can be tied to a specific month, quarter, holiday or vacation period, as well as a meteorological or growing season.
The Tickeron Valuation Rating of 93 (best 1 - 100 worst) indicates that the company is significantly overvalued in the industry. This rating compares market capitalization estimated by our proprietary formula with the current market capitalization. This rating is based on the following metrics, as compared to industry averages: STX's P/B Ratio (97.087) is very high in comparison to the industry average of (7.187). P/E Ratio (66.293) is within average values for comparable stocks, (51.474). Projected Growth (PEG Ratio) (0.527) is also within normal values, averaging (23.994). Dividend Yield (0.003) settles around the average of (0.004) among similar stocks. P/S Ratio (14.706) is also within normal values, averaging (51.774).
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a designer of data storage products
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