Key Takeaways
- Add up holdings — concentration hides between stocks
- Check stock, sector and country exposure separately
- Model a 20% stock drop before it happens
You Don't Own Stocks. You Own a Portfolio — and It Has Its Own Personality
Most investors can describe every holding they own and still have no idea what they own overall. Twelve stocks feel diversified until someone adds them up and finds 60% of the money in technology, 80% in one country, and a quarter of everything riding on a single company. Risk rarely hides inside a holding. It hides between them.
This guide is the portfolio step of our AI-prompts investing cluster, following the method of How to Use ChatGPT to Analyze Stocks Before Buying: 6 Powerful AI Prompts. The input this time is your own holdings list — names and dollar amounts, exported from your broker or typed out. Strip out account numbers and personal details; the AI needs the holdings, nothing else.
Prompt 1: Turn a Holdings List Into an Allocation Map
"Here is my portfolio: [paste each holding and its dollar value]. Calculate the total, then show each holding as a percentage of the whole portfolio, largest to smallest. Show your math, and use only the figures I gave you."
This ten-second calculation is the one most investors have never actually seen for their own money. Percentages change behaviour in a way dollar amounts don't — "a $4,000 position" sounds modest until it's 31% of everything you have.
Prompt 2: Hunt for Concentration by Stock, Sector and Country
"Using the allocation you just calculated, group my holdings three ways: by individual company, by sector, and by country. For each grouping, name the largest exposure and its percentage. Flag anything over 25% in a single company, 40% in a single sector, or 70% in a single country, and explain in plain English why concentration cuts both ways."
Concentration is how portfolios get rich and how they get wrecked — often the same portfolio, in different years. The point of the prompt isn't to declare your mix wrong; it's to make sure the concentration you have is the concentration you chose.
Prompt 3: Expose the Hidden Overlap Between Your ETFs and Stocks
"My ETF holdings list their top holdings here: [paste top holdings for each ETF]. Compare them with the individual stocks I own. Where am I doubling up on the same companies through both a fund and a direct holding? Estimate my true combined exposure to those names."
This is the trap the ETF step of this cluster warned about, one level up: you can own a broad Canadian ETF, a U.S. index fund, and a handful of favourite stocks — and discover the same mega-cap names sitting at the top of all three. Your statement says diversified. Your actual exposure disagrees.
Prompt 4: Model a Bad Year Before It Arrives
"My portfolio is worth $[x], with [x]% in stocks and [x]% in bonds and cash. If stocks fell 20% and bonds stayed flat, what would my portfolio be worth? Show the math. Then do the same for a 35% stock decline. Label these as hypothetical scenarios, not predictions."
A worked example (hypothetical numbers, real method). A $50,000 portfolio split 70/30 holds $35,000 in stocks. A 20% stock decline takes $7,000 off that sleeve, leaving the portfolio at $43,000 — a 14% overall fall. Seeing that number on a calm Tuesday, in a scenario you chose, is what stops it from becoming a panic decision on a terrible Thursday.
Prompt 5: Explore Rebalancing Without Asking for Trades
"Based on the concentration you flagged, describe two or three ways this portfolio could be rebalanced toward [your stated target mix], using plain descriptions of what would change and why. Do not recommend specific trades or tell me what to buy or sell — I will make those decisions myself."
That last sentence is doing real work. You want the AI as an analyst laying out options and trade-offs — not as an advisor with a buy list. The decisions, and the account-specific tax consequences covered in the next guide in this cluster, stay human.
What This Check Can't Do
It can't feel your actual risk tolerance, it can't know the goals this money is for, and its picture is only as current as the list you paste — portfolios drift every day the market moves. It also can't judge individual holdings; for that, the cluster's earlier steps (earnings, valuation, dividends) do the digging. Run this portfolio check a couple of times a year, the way you'd check a smoke detector: boring, quick, and very reassuring when the answer is fine.
Series note: Previous: compare Canadian ETFs before investing. Next: TFSA, RRSP and non-registered account taxes on stocks and ETFs.
The Twikup Take
Nobody's portfolio drifts into danger through one bad decision — it drifts through twenty reasonable ones that were never added up together. These five prompts do the adding. What you do with the totals is still your call, which is exactly how it should be. Next in the cluster: the Canadian layer — how the account you hold these investments in changes the tax you pay on them.
Image: Illustrative image.