Tech Analysis in Stocks: Comprehensive Guide for Investors 2025

Tech analysis in stocks remains an indispensable approach for many investors seeking to optimize their decisions on financial markets. This comprehensive guide of 2025 delves deeply into the foundations, methods, and tools of tech analysis, providing concrete examples tailored to the current context, including the study of Antofagasta plc – a major player in the copper sector listed in London.

Introduction to Technical Analysis

Technical analysis involves studying historical price and volume data of a financial asset to predict its future movements. Unlike fundamental analysis, which relies on the study of companies’ results and economic outlooks, technical analysis focuses solely on market evolution. It uses various charts, indicators, and methodologies to identify trends, buy or sell signals, and significant levels for strategic action.

Objectives of Technical Analysis

The main objectives of technical analysis are:

  • To determine the major price trends to position oneself at the right time.
  • To identify critical support (floor) and resistance (ceiling) levels.
  • To detect buy and sell signals through the use of advanced indicators.
  • To evaluate the potential for upward or downward movement of assets to adjust one’s allocation.

The Fundamentals of Technical Analysis

Before applying technical analysis, it is essential to understand its basic concepts:

  • The concept of trend: Trends describe the general direction of a market or asset (bullish, bearish, or neutral).
  • Supports and resistances: These are price zones where buyers or sellers become particularly active, causing reversals or slowdowns.
  • Volume: It measures the strength or weakness of a price movement.

The Tools of Technical Analysis

There are numerous tools and indicators used in technical analysis, among the most important are:

  • Moving averages: They smooth the evolution of prices over various periods (20, 50, 200 days) to reveal the underlying trend.
  • RSI (Relative Strength Index): This indicator measures the speed and magnitude of price movements. An RSI above 70 indicates an overbought condition, while an RSI below 30 signals oversold.
  • MACD (Moving Average Convergence Divergence): It detects trend changes by comparing two moving averages.
  • Bollinger Bands: They frame the price and provide an indication of volatility. When the price reaches a band, a correction or rebound may occur.
  • Japanese candlesticks: This graphical format highlights the open, close, high, and low over a given period. Specific candlestick patterns allow detecting reversal or continuation trend signals.

The Most Used Types of Charts

Charts are the central tool of technical analysis. Here are the main formats:

  • Japanese candlestick charts: Ideal for quickly visualizing key price information and spotting reversal patterns.
  • Line charts: Simply present the closing price over the period studied, facilitating the analysis of the overall trend.
  • Bar charts: Display the price evolution in the form of vertical bars, allowing for quick reading of intraday dynamics.

Understanding Support and Resistance Levels

Support and resistance levels represent indispensable reference points for anticipating market behavior. A support level is an area where the price tends to stabilize after a decline, while resistance corresponds to a ceiling reached more than once before reversing.

For example, on a stock like Antofagasta plc, if the price tends to bounce upwards each time it approaches £2,600, this level can be interpreted as support. Conversely, if the price peaks at £2,800 without ever breaking through this threshold, it is referred to as resistance. A break of support or resistance often predicts an accelerated movement of the price in the direction of the breakout.

The Use of Technical Indicators

Technical indicators are mathematical tools that help refine analysis. The most well-known include:

  • RSI: Helps detect overbought or oversold conditions, very useful for anticipating sudden reversals in price.
  • MACD: Identifies crossovers between the signal line and the MACD line, providing effective entry or exit points.
  • Bollinger Bands: When the price touches an upper or lower band, it may indicate an extreme condition, often followed by a correction.

The simultaneous interpretation of different indicators strengthens the relevance of observed signals. For example, a divergence between the MACD and the price movement can signal an imminent reversal.

Case Study: Technical Analysis and Fundamental Data of Antofagasta plc

To illustrate the approach concretely, let's take the case of Antofagasta plc, a leading player in the raw materials sector specializing in copper mining.

Company Overview

Antofagasta plc is a British company operating primarily in the raw materials sector, specifically in copper. Through its Mines and Transport divisions, the group operates four major mines located in Chile and also has strategic rail and road transport services.

  • Industry: Raw Materials
  • Sub-industry: Copper

Updated Stock Data (November 2025)

  • Quotation : London Stock Exchange (GBX – pence sterling)
  • Current Price : 2,693 GBX, approximately €31 per share
  • Market Capitalization : £35.46 billion, approximately €40.8 billion
  • Dividend per Share (Forecast 2025) : Approximately 0.34 GBX, or €0.39 per share (yield of about 1.25% )

Financial Ratios

  • PER (2025) : 33.7 – Company is relatively expensive compared to the basic materials sector
  • P/E Ratio : 2.5x
  • Price/Sales : 3.6x
  • Float : 34.5%

Missing Elements and Points of Caution

  • Beta : Relative volatility to the index is not confirmed due to lack of updated sources.
  • Payout ratio, sector outlooks, and trading volume : These data points should be closely examined for a thorough analysis.
  • Revenue and Net Income : To be found on financial platforms for additional fundamental analysis.

Technical Analysis of Antofagasta plc (ANTO.L)

An effective technical analysis of Antofagasta plc relies on various indicators, suitable for different investor profiles:

  • Moving Averages (50 and 200 days) : The short-term moving average currently sits above the long-term one, indicating an underlying upward trend.
  • RSI : Over the last few weeks, the RSI has fluctuated between 55 and 60, suggesting no overbought condition but a consistently positive momentum.
  • MACD : Recent bullish crossovers confirm the possibility of continued trend, although volatility has increased since the release of semi-annual results.
  • Volumes : Trading volumes over the recent period have exceeded monthly averages, signaling renewed interest from professional investors.
  • Support Levels : A major support level is around 2,600 GBX, marked by several rebounds since the start of the fiscal year.
  • Resistance Levels : The key resistance to watch remains at 2,823 GBX, representing the annual high. A clear breakout above this level could potentially open the way for further acceleration.

An analysis of Japanese candlestick patterns on the daily chart reveals several hammer and morning star formations, hinting at recovery zones around the primary support level.

Investment Strategies Based on Technical Analysis

Bullish Trend and Moving Average Follow-Up

The classic strategy involves buying the stock when the 50-day moving average moves above the 200-day one, confirming the trend. This method can be combined with RSI readings to avoid excessive buying.

Leveraging Support and Resistance Levels

Buying on retracement towards the primary support level allows securing low-risk positions with a stop-loss below the critical level. Conversely, selling on tests of resistance – while monitoring price reactions – offers optimal exits at higher levels.

The Combined Indicator Approach

  • Trend confirmation through the appearance of moving averages.
  • Momentum validation using RSI and MACD.
  • Volume analysis to ensure institutional investor support for the movement.

It is recommended to also monitor divergences: if the price reaches a new high and the RSI or MACD does not confirm it, trend exhaustion may be looming.

Optimization of Decisions: Practical Advice for Investors

  • Avoid buying in overbought conditions (RSI > 70) and selling in oversold conditions (RSI < 30).
  • Prefer buying on support and selling on resistance after graphical confirmation.
  • Use a stop-loss systematically to limit risk in case of scenario invalidation.
  • Analyze the evolution of volume which validates or invalidates the strength of the movement (high volume = conviction; low volume = caution).
  • Keep in mind that technical analysis offers no guarantee: always combine it with fundamental analysis to maximize relevance.

Limits of Technical Analysis and Risks to Watch Out For

Technical analysis relies on the study of past data. It has several limitations:

  • It does not take into account external events that could abruptly impact prices (macroeconomic announcements, geopolitics, regulatory changes).
  • Its effectiveness depends on the adherence to the technical scenario, which is never guaranteed at 100%.
  • Signals can be contradicted by strong current events or low volumes.

For example, the volatility of copper on world markets or an evolution in Chilean mining regulations affecting Antofagasta plc can distort even the best constructed technical analyses.

Combining Technical Analysis and Fundamental Analysis

It is ideally recommended to combine technical analysis with a thorough study of the company's fundamentals:

  • Study of revenue, net profit, and sectoral outlook.
  • Consideration of dividend yield and financial stability.
  • Analysis of quarterly results and macroeconomic indicators (copper demand, global price, evolution of energy transition policies).

This combined approach improves the robustness of investment decisions and reduces the risk of misinterpretation.

Conclusion: Technical Analysis, An Indispensable Tool for Decision-Making on Markets

Technical analysis in the stock market imposes itself as a powerful and evolving tool to optimize your decisions as an investor. Its mastery requires a deep understanding of indicators, regular practice of charting, and detailed analysis of support and resistance levels. The example of Antofagasta plc illustrates the importance of rigor in interpreting data and constant updating of information.

To succeed in the markets in 2025, combine technical and fundamental analysis, adapt your strategy to market volatility, and remain attentive to reversal signals. This will ensure optimized management, adapted to the evolutions of global financial markets.