The Relative Strength Index (RSI) is a momentum oscillator that measures the speed and change of price movements. The RSI is most typically used on a 14-day period, measured on a scale from 0 to 100. Traditionally, an asset is considered overbought or overvalued when the RSI is above 70 and oversold or undervalued when it is below 30. A shorter period RSI is more reactive to recent price changes, so it can show early signs of reversals. 9-Day RSI is sometimes used together with 14-Day RSI in a two period divergence strategy.
The Relative Strength Index (RSI), developed by J. Welles Wilder in his book “New Concepts in Technical Trading Systems.”, is a momentum oscillator that measures the speed and change of price movements. The RSI is most typically used on a 14-day period, measured on a scale from 0 to 100.
Traditionally, an asset is considered overbought or overvalued when the RSI is above 70 and oversold or undervalued when it is below 30. A RSI surpasses the 30 level indicates a bullish sign, when it slides below 70 level, it’s a bearish sign. This level can be adjusted depending on the security’s pattern and the market’s underlying trend. In an uptrend or bullish market, the RSI might range within a higher interval, investors could set the support level higher. If a downtrend or bearish market occurs, investors may need to lower the resistance level.
RSI can also be used in trading techniques to indicate the trading signal, such as Divergences and Swing Rejections. A shorter period RSI is more reactive to recent price changes, so it can show early signs of reversals. 9-Day RSI is sometimes used together with 14-Day RSI in a two period divergence strategy.
Axcelis Technologies 9-Day RSI Related Terms
ACLS vs IPGP, KLIC, UCTT: 9-Day RSI Comparison
For the Semiconductor Equipment & Materials subindustry, Axcelis Technologies's 9-Day RSI, along with its competitors' market caps and 9-Day RSI data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Axcelis Technologies 9-Day RSI vs Semiconductors Industry
For the Semiconductors industry and Technology sector, Axcelis Technologies's 9-Day RSI distribution charts can be found below:
* The bar in red indicates where Axcelis Technologies's 9-Day RSI falls into.
* Note that the formula uses a positive value for the average loss.
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
Axcelis Technologies (ACLS) has a 9-Day RSI of 49.02 as of Jun. 25, 2026. According to the industry distribution chart, Axcelis Technologies ranks #531 out of 1033 companies in the Semiconductors industry, placing it in the top 51.4%.
Is Axcelis Technologies' 9-Day RSI too high?
Axcelis Technologies' current 9-Day RSI is 49.02. The Semiconductors industry median 9-Day RSI is 48.55. Axcelis Technologies' value of 49.02 is 1% above this industry median. Based on the distribution chart, Axcelis Technologies ranks #531 out of 1033 companies in the Semiconductors industry, which is below the industry midpoint. Overall, Axcelis Technologies has a GF Score™ of 85/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Axcelis Technologies' 9-Day RSI compare to IPGP and KLIC?
According to the Semiconductors industry distribution chart, Axcelis Technologies ranks #531 out of 1033 companies for 9-Day RSI. This places Axcelis Technologies in the lower half of its industry. The industry median 9-Day RSI is 48.55. Axcelis Technologies' value of 49.02 is 1% above this benchmark. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 9-Day RSI for a Semiconductors company?
The median 9-Day RSI among Semiconductors companies is 48.55, based on 1,033 companies in the industry. Companies in the top quartile (top 25%) have a 9-Day RSI significantly above this median, while those in the bottom quartile fall well below. However, 9-Day RSI should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Axcelis Technologies's current 9-Day RSI of 49.02 is 1% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high 9-Day RSI mean?
A high 9-Day RSI can signal that a stock is expensive relative to its fundamentals. For the Semiconductors industry, the median 9-Day RSI is 48.55 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Axcelis Technologies's current 9-Day RSI is 49.02. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Axcelis Technologies stock overvalued right now?
Based on GuruFocus' analysis, Axcelis Technologies (ACLS) is currently considered Significantly Overvalued. The stock's GF Value™ is $87.50, compared to a current price of $168.91 — trading 93% above its estimated fair value. The current 9-Day RSI is 49.02 and 1% above the Semiconductors industry median of 48.55. Axcelis Technologies' overall GF Score™ is 85/100 with 8 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 9-Day RSI calculated?
9-Day RSI is calculated from a company's financial statements. For Axcelis Technologies (ACLS), the current 9-Day RSI is 49.02 as of Jun. 25, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is Axcelis Technologies (ACLS) Overvalued in 2026?
Based on GuruFocus' analysis, Axcelis Technologies stock appears to be overvalued.
The current stock price of $168.91 is trading 93% above its estimated GF Value™ of $87.50.
GuruFocus considers Axcelis Technologies to be Significantly Overvalued.
Key valuation signals for ACLS:
9-Day RSI: 49.02
GF Value™: $87.50 vs. price of $168.91 (93% above fair value)
Industry Position: 1% above the Semiconductors median (#531 of 1033)
No single metric tells the full story. See the ACLS stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Axcelis Technologies Inc designs, manufactures, and services ion implantation and other processing equipment used in the fabrication of semiconductor chips. In addition to equipment, the company provides aftermarket lifecycle products and services, including used tools, spare parts, equipment upgrades, maintenance services, and customer training. Geographically, the group has a business presence in North America, Asia Pacific, and Europe, of which key revenue is derived from the Asia Pacific.
85GF Score
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