Writing an investment thesis and research report

In simple terms

Writing forces clarity. Vague ideas such as "good company, growing fast" turn into specific claims you can test, or they fall apart. A written thesis also lets you check later whether you were right for the right reasons.

In this path, the thesis is an exercise in reasoning. It is not a recommendation, and a note written for yourself should be as honest about weaknesses as about strengths.

The thesis in a few sentences

A thesis states why the share may be worth more, or less, than its price, and what has to happen for that to be true.

Weak: "A great company with strong growth and a good management team."

Stronger: "The made-up company Example Foods can grow volumes about 8% a year for five years as its new plant fills, with margins rising from 14% to 16%. At ₹500, the price implies roughly 5% volume growth and flat margins. If the plant fills on schedule, the base-case value is about ₹550; if competition forces price cuts, about ₹300."

The stronger version names the drivers, the assumptions, the gap with the market, and the downside.

A structure for the note

Two or three pages is usually enough.

Facts, estimates and opinions

Mark each clearly:

• Facts with sources: "Revenue grew 12% last year (annual report)."
• Estimates with reasoning: "We estimate volume growth of 8% a year, because the new plant adds 40% capacity and utilisation has risen in each of the last four quarters."
• Opinions labelled as such: "In our view, management's capital allocation has been sound."

Mixing them makes a note look more certain than it is.

Uncertainty and conflicts

State what you do not know, the open questions from your red flags review, and how confident you are. If you already own the share, say so: ownership makes it harder to be objective, as the behavioural biases lesson explains.

Anyone who publishes research for others in India must follow SEBI's rules for research analysts, as the education, research and advice lesson explains. A note written for your own learning is not advice to anyone else.

Shorter is better

Long reports often hide weak thinking under detail. A useful test: could you explain the thesis, the main risk and what would change your mind to a friend in two minutes? If not, keep thinking before writing more.

Why it matters

A written thesis turns research into something you can act on carefully and check honestly later. It is the foundation for monitoring, for learning from mistakes, and for resisting the urge to change your story to fit the share price.

Limitations

A well-written note can still be wrong. Clarity of writing is not accuracy of prediction. Notes also date: assumptions need revisiting as evidence arrives.

Common mistakes

• Writing long reports with no clear thesis.
• Presenting estimates as facts.
• Leaving out risks and what would prove the thesis wrong.
• Hiding ownership of the share.

Try it yourself

1. For a company you have researched, write the thesis in no more than five sentences.
2. List the three to five key assumptions as testable statements.
3. Fill in each section of the structure above in no more than three pages.
4. Mark each sentence as a fact, an estimate or an opinion.