The case for keeping an investment journal — why writing before you buy makes you a better investor, and how Indian investors are using public journals to build real credibility.
Charlie Munger kept notes on every investment he made. Warren Buffett writes annual letters that are, essentially, a public investment journal — detailed reasoning, honest post-mortems, updated thesis. The discipline of writing is inseparable from the discipline of investing.
Yet most Indian retail investors invest entirely from memory. They remember when they bought Reliance, but not why. They recall their Adani exit, but not whether it matched the thesis they had entering. Without a written record, every decision exists only as a feeling — and feelings are unreliable narrators.
An investment journal is not a trade log. A trade log tells you what you did. A journal tells you what you were thinking when you did it.
A journal entry for a position might include:
That's it. It doesn't need to be long. Three paragraphs before you buy is enough to transform how you invest.
Writing "I'm buying HDFC Bank because it's a quality business" is easy. Writing why it's quality, at what PE you're buying it, and what your return expectation is over three years is harder. The writing reveals whether you have a thesis or just a hunch.
When a stock drops 20%, the human brain instinctively rewrites history — "I knew the fundamentals were shaky, I was always going to hold through this." A written record is immune to this revisionism. You can check exactly what you believed when you bought, and whether anything has actually changed.
Did you make money because your thesis was correct, or because the market moved in your favour for unrelated reasons? Without a journal, you'll never know. With one, you can look back at every winner and every loser and honestly assess: was I right about the thing I thought mattered?
Most investors find selling harder than buying. A journal entry with explicit sell conditions makes it easier: "I will sell if the thesis changes OR if the price exceeds X." When conditions are written down in advance, decisions become cleaner and less emotional.
An investor who journals for three years has three years of annotated decisions to learn from. An investor who doesn't has only three years of feelings. The compounding of investment knowledge is real — but it requires written records to compound from.
Some investors make their journals public. Not to give tips — that crosses SEBI lines — but to document their reasoning transparently. The accountability of a public record is significantly higher than a private one. When you know your thesis is public, you think more carefully before writing it. And you think even more carefully before abandoning it without reason.
Indian FinTwitter is full of account screenshots and performance claims. What's rare is documented, verifiable track records with the reasoning attached. That rarity is exactly what makes public investment journals valuable.
Browse public portfolios on Lekha to see what documented investment thinking actually looks like — not tips, not calls, just investors who opened their books.
Open a blank document. Pick one position in your current portfolio — any one. Write three paragraphs: why you bought it, what you expect, and what would make you sell. That's your first journal entry.
Do that for every new position going forward. Review your journal quarterly. The improvement in your thinking will be visible within six months.
If you want a structured tool built specifically for Indian investors — with NSE/BSE stock support, public sharing, and a permanent record — start journaling on Lekha. It's free.
Ready to open your books?
Lekha is a free investment journal for Indian investors. Document your portfolio, share your thesis, build real credibility.