A recurring question at seed and Series A: do I need to write an investment memo, or is the pitch deck enough? The cleanest answer is that they are two sides of the same coin. Same story, different levels of detail. The pitch deck is the three-minute movie trailer. The investment memo is the three-hour feature film. If they contradict each other, you have a much bigger problem than which one to send.
An investment memo is the internal document a partner writes to convince the rest of the firm to fund your company. Historically, founders never saw it. Then a handful of firms started publishing anonymized memos and asking founders to write their own. Now it is a normal part of the process at Series A and above.
The memo is not a longer pitch deck. It is a structured argument that answers, in prose, every question a partner would ask during diligence. Length varies: five to fifteen pages is typical. Format is prose with occasional charts, not bulleted slides.
The important shift is that the memo is a decision document, not a marketing document. Its job is to help someone say yes or no with conviction, not to persuade someone who has not been paying attention.
It forces you to close the gaps in your deck. A pitch deck lets you gloss over hard questions with a clean chart. A memo does not. When you have to write, in complete sentences, why your CAC will drop 40 percent over the next 18 months, you find out very quickly whether you actually believe it.
It prepares you for diligence. By the time you get to a partner meeting, you will be asked most of the questions the memo answers. Writing the memo first means you already have the answers ready, written down, and consistent across meetings.
It gives the sponsoring partner ammunition. Even if you never send the memo, the partner championing your deal has to write a version of it internally. If you have already thought through the market sizing, the competition, the team gap analysis, and the risks, they can lift your framing…
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