What Makes a Great Investment Memo

A strong investment memo distills a complex business into a clear thesis, supported by evidence and honest risk disclosure. It is not a marketing deck, it is the document that earns a second meeting. The distinction matters because the two artifacts do different work: a deck performs in the room with management present to carry it, while a memo circulates alone, gets forwarded to the skeptical partner who was not in the meeting, and is read on a train with no one there to defend it.

Write for that reader. The forwarded-to partner has seen a thousand of these, allocates minutes rather than hours, and is looking for a reason to stop reading. The memo that survives is the one whose first page makes the thesis falsifiable, whose numbers reconcile with each other on every page, and whose author visibly anticipated the objections rather than hoping they would not come up.