How to run a quarterly portfolio review (a repeatable checklist)

Here is an awkward question. When did you last sit down, calm and unbothered, and actually look at everything you own and why you own it? Not a glance at the green number on a good morning or a panic-refresh on a bad one. A proper look, on purpose, when nothing in particular was happening.

For most people the honest answer is “never, really”, and the finance industry is perfectly happy with that. A customer who never reviews trades on feelings, and feelings are wonderfully profitable for everyone except the person having them. So let me sell you on the least glamorous and most powerful habit in investing: a boring review you run on a schedule, like changing the oil, whether or not the engine is making a funny noise.

Why you do this on a calendar, not on a vibe

Almost every bad portfolio decision happens at the worst possible moment. A scary headline lands, or a position lurches, and suddenly you make a permanent choice in a temporary mood. Willpower does not save you here. It loses to a falling chart every single time.

So decide when your hands are steady. Pick a fixed date, run the same review each time, and by the time the market hands you a reason to panic, the hard calls are already made. Why a quarter? It is the sweet spot. Long enough that real information has piled up, earnings and dividends and a solid block of your own behaviour. Short enough that drift and a quietly broken thesis cannot fester for a year. The first weekend after quarter-end works. The market will always offer you something more urgent. The review is the urgent thing.

Reconcile the book before you have a single opinion

Start here, always. Nothing downstream means anything if the book underneath is wrong. A factor score or a win rate inherits the trustworthiness of the ledger it sits on, and not a scrap more.

So go account by account and tie it out against the real statement: share counts, cash balance, tax lots. Because you typed every transaction into Strata yourself, your holdings are derived by replaying that ledger, so a discrepancy is a genuine signal and not some mystery a robot middleman scrambled while you slept. Found a mistake? Void the bad entry and re-enter it, so the audit trail remembers what happened. It is the same reason accountants do not use erasers. If your money sits across a few brokerages, a pension, and a wallet or two, this is the step that proves your one big consolidated number is real, the whole discipline of a book across many accounts.

Put your past self on trial

Book ties out? Good. Now go position by position and ask the one question almost nobody asks: would I buy this today, knowing what I now know? Not “am I up on it”. Would I open it fresh, right now, with this money.

This is where your thesis earns its keep. A thesis is a living document: the drivers, assumptions, sizing, and invalidation rules you wrote down when you were calm. Walk each one and its signals. A breached signal already flips the thesis to AT-RISK on its own, but this is where you decide what to actually do about it instead of letting it glow red in the corner forever. Are the assumptions still the reason you hold the thing, or are you clinging on out of habit, hope, and a reluctance to realise a loss? Update the conviction score to match what you believe now. And when a thesis is broken, say it out loud, because selling once the reason is gone is the hardest move in the game.

Read your journal like data, not nostalgia

Your journal is the only honest record of how you actually behave, not the flattering highlight reel your memory keeps. We are all heroes in retrospect. The review is where you read the receipts instead.

Look at win rate and expectancy over the quarter and the trailing periods. Expectancy is the one that tells you whether your process makes money, not any single lucky trade. Compare plan against actual: where did you wander off from the entry, stop, target, or size you wrote down, and did it help or hurt? Then read the emotion scorecard, and if your worst outcomes keep clustering around your high-FOMO entries, you have found a leak you can plug. That is the discipline loop snapping shut: reasoning written down, confronted with results, fed into the next call.

Now zoom out: drift, income, and the taxman

Step back from the individual names and look at the shape of the whole thing. Compare your allocation to your targets, by asset class, sector, and position size, and measure the drift. A winner that has doubled is also a concentration you never actually chose, and that is how a deliberate portfolio quietly turns into an accidental one.

Then check your income and tax context. Read the dividends you received against what you projected, look at the calendar ahead, and check your tax lots before you touch anything: which are long-term, which sells would trigger gains you do not want this year, which holdings sit in which wrapper. A rebalance decided on price alone can hand more to the revenue than the drift was costing you.

Decide on purpose, then mostly do nothing

Looking is not acting, and confusing the two is how busy people lose money. Having reviewed everything, decide once, in writing, what you will do with each position: trim, add, exit, or nothing. And here is the punchline the action-junkies hate: “nothing” is usually the right answer. A quarter where the book reconciles, the theses hold, and the drift is tolerable should end in zero trades and a cup of tea. Write the reasoning down so next quarter you can grade today’s calls.

If you want the whole thing on one breath, it is just the six moves above, in order, run cold every quarter. Reconcile the book so the numbers are real. Put each thesis on trial. Read the journal as evidence rather than memory. Measure your drift, then weigh the income and tax fallout of touching anything. And last, decide on purpose and write it down, even when the decision is to leave it all alone.

There is nothing complicated here, and nothing clever either. That is exactly why it works. The people who quietly compound for decades are not the ones with the hottest take. They are the ones boring enough to run the same calm review every quarter while everyone else reacts. Be that gloriously boring person.