INVESTOR LETTER #129
Writing an Investment Thesis
An investment thesis is a written explanation of why you're investing in a company. It forces you to think clearly before risking your money. Instead of buying because a stock is going up or someone recommended it, you write down the facts, your assumptions, the risks, and what needs to happen for the investment to succeed. If you can't explain why you're buying a stock, you probably shouldn't buy it.
INVESTOR NOTE
A business owner thinks in decades. A speculator thinks in minutes.
Don't Buy Without a Reason
Imagine lending ₹5 lakh to a friend without asking why they need it or how they'll repay you. You'd never do that. Yet many people buy stocks without clearly knowing why. An investment thesis gives every investment a purpose.
What Is an Investment Thesis?
An investment thesis is a short written document that explains why you believe a company is a good investment. It isn't about predicting the future—it's about documenting your reasoning before emotions enter the picture.
Writing Forces Better Thinking
Thoughts inside your head often feel convincing until you try to write them down. The act of writing exposes weak assumptions, missing information, and unanswered questions that you might otherwise ignore.
Start With the Business
Begin by explaining what the company does, how it makes money, who its customers are, and why the business exists. If this part isn't clear, nothing else in your thesis will be either.
Explain Why the Business Can Win
Describe what gives the company an edge over competitors. It could be a strong brand, low costs, network effects, pricing power, superior management, or another durable competitive advantage.
Identify the Growth Drivers
A good investment thesis explains what could help the business grow over the next several years. Rather than relying on hope, focus on realistic drivers that could increase revenue, profits, or cash flow.
Be Honest About the Risks
Every investment has risks. A strong thesis openly discusses what could go wrong, what assumptions may prove incorrect, and which events would make you reconsider your investment.
Know What Would Change Your Mind
Before buying the stock, decide what evidence would prove your thesis wrong. This helps you stay objective if the business changes instead of blindly holding the investment forever.
Review It From Time to Time
Your investment thesis shouldn't be forgotten after buying the stock. Revisit it after quarterly results and annual reports to see whether the business is progressing as expected or whether your original assumptions need updating.
Keep It Simple
An investment thesis doesn't need to be twenty pages long. If you truly understand the business, you should be able to explain your reasons clearly and simply. Complexity often hides confusion.
The Best Investors Write Before They Buy
Markets are emotional, but a written investment thesis keeps you rational. It reminds you why you invested, helps you avoid impulsive decisions, and gives you a framework for judging whether the business is performing as expected. The goal isn't to predict perfectly—it's to think clearly.
INVESTOR PRINCIPLE