Best Investment Psychology Newsletters in 2026

NewsletterFIT tracks 3 newsletters that cover Investment psychology as a primary topic, 2 of them with posts in the last 90 days. By publicly shown subscriber count, the largest are 90s.pm.investing (10K) and The Undecided Investor (1K).

Updated Nov 7, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    90s.pm.investing10K subscribers

    SubstackSeveral times a week · last post 5 days ago

    From recent posts: 90s.pm.investing publishes weekly articles analyzing market movements, earnings reports, and technological shifts in the semiconductor and AI sectors. The publication targets investors interested in information theory…

    Likely audience: Investors

  2. 2
    The Undecided Investor1K subscribers

    SubstackMonthly or less · last post 47 days ago

    From recent posts: The article discusses the psychological concept of envy in investing, explaining how it leads to poor decision-making and short-termism, and advises readers to focus on their own long-term goals rather than comparing th…

    Likely audience: Individual investors

  3. 3
    Peter’s Substack—

    Substacklast post Jun 7, 2026

    I aim to help people make better investment decisions by tackling largely timeless, long-term questions about investing.

    Likely audience: Individual investors

Latest posts from these newsletters

Browse all topics