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O Diário do Investidor: Registre e Aprenda com Suas Decisões

O Diário do Investidor: Registre e Aprenda com Suas Decisões

19/02/2026 - 14:38
Marcos Vinicius
O Diário do Investidor: Registre e Aprenda com Suas Decisões

In the dynamic world of investing, success often hinges not on luck but on deliberate action. Understanding market cycles and personal biases is essential for outperforming the average.

Howard Marks, co-founder of Oaktree Capital Management, shares decades of insights in his book "O Mais Importante para o Investidor." His emphasis on second-level thinking encourages investors to look beyond surface-level information.

This article introduces a practical tool: an investor's diary inspired by Marks' teachings. Recording decisions and reflecting regularly can turn experience into actionable knowledge.

The Foundation: Howard Marks' Timeless Wisdom

Marks' book is structured around 20 chapters, each beginning with "The most important thing is..." These lessons cover fundamental investment principles like risk management and market efficiency.

He argues that markets are not always efficient due to human irrationality. This creates opportunities for diligent investors who study more than the average.

  • Pensamento de segundo nível: Analyze events and their impact on others.
  • Gestão de risco inteligente: Accept recognized risk for better returns.
  • Ciclos econômicos inevitáveis: Most things cycle, and gains come from this awareness.
  • Oportunismo paciente: Wait for extremes to buy quality assets cheaply.

Applying these concepts requires consistency and self-awareness. A diary helps bridge theory and practice by documenting your journey.

Why Every Investor Needs a Diary

Keeping a diary forces you to articulate your thought process clearly. It serves as a personal feedback loop for learning from mistakes.

Without documentation, emotional biases can cloud judgment. Fear and greed often lead to poor decisions, but a diary provides objectivity.

  • Enhances discipline through regular entries.
  • Improves risk management with documented assessments.
  • Builds consistency over the long term.
  • Encourages adaptation to changing market conditions.

By logging investments, you create a valuable resource. This practice turns random notes into strategy for continuous improvement.

Building Your Diary: A Step-by-Step Guide

Start with a simple structure for each diary entry. Include date, asset, and entry price to track basic details.

Incorporate Marks' concepts to deepen analysis. Note the perceived market cycle and how it influences decisions.

Use prompts from Marks' 20 chapters to guide reflections. "Study more than the average" can inspire research on overlooked opportunities.

  • Make daily or weekly entries to maintain momentum.
  • Review sections monthly for progress assessment.
  • Include numerical data like portfolio performance.
  • Document emotional states to identify biases.

This approach ensures your diary is a learning tool. It transforms notes into coherent strategies for investment success.

Key Concepts to Record and Reflect Upon

Focus on recording specific concepts from Marks' book. Second-level thinking should be a cornerstone of every entry.

Ask how other investors might react to decisions. This helps spot mispriced assets for superior returns.

  • Record applications of second-level thinking.
  • Note risk-return profiles and compare to expectations.
  • Log observations of market cycles.
  • Reflect on patience in waiting for opportunities.

Address behavioral biases that Marks warns against. Fear of missing out can derail plans, but documentation helps manage it.

Over time, patterns will emerge from your entries. This reveals strengths and weaknesses in your investment approach.

Learning from the Market's Pendulum

Marks describes markets as pendulums swinging between extremes. Recognizing these swings is crucial for timing investments.

In your diary, note current market sentiment regularly. During periods of high optimism, be cautious and avoid overvalued assets.

  • Identify historical examples like the 2020 crash.
  • Document lessons on cyclical inevitabilities.
  • Use the two rules of cycles in analysis.
  • Apply this to buy in fear and sell in greed.

Consistent recording makes you attuned to rhythms. This prepares for future cycles without needing predictions.

Marks' advice to prepare rather than predict becomes actionable. It turns knowledge into practical wisdom for resilience.

Practical Tips for Consistent Diary Keeping

Maintaining a diary requires commitment but pays off. Start small and be consistent with brief entries initially.

Set aside weekly time for updates. This builds a routine reinforcing discipline, echoing Marks' long-term consistency.

  • Use digital tools or a physical notebook.
  • Incorporate visual elements like performance charts.
  • Review past entries to measure growth.
  • Share insights with mentors for feedback.

The goal is progress, not perfection. Each entry adds to your journey as a thoughtful investor.

By integrating Marks' principles, your diary becomes powerful. It guides through uncertainties with clarity and confidence.

Conclusion: The Journey to Mastery

Howard Marks' book offers a blueprint for excellence. Keeping an investor's diary bridges gaps between theory and practice.

Embrace this tool to record and refine decisions. Over time, develop second-level thinking and risk management skills.

Start your diary today for financial mastery. With each entry, build a legacy of informed and deliberate investing.

Marcos Vinicius

Sobre o Autor: Marcos Vinicius

Marcos Vinicius, 37 anos, é gestor de patrimônio no passonovo.org, com expertise em diversificação para clientes de alta renda, protegendo e multiplicando fortunas em cenários econômicos desafiadores.