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Analyze Stock Portfolio Concentration & Fundamentals: AI Prompt for Claude & ChatGPT

Copy this Claude prompt to analyze a stock portfolio's concentration, shared risks and business quality. Works with Claude, ChatGPT, Gemini, and Grok.

This portfolio prompt for stock research lays 5 to 20 holdings side by side: concentration, shared drivers, business quality, and valuation spread. Paste the same metrics for every name into Claude, ChatGPT, Gemini, or Grok. A free Chartloom portfolio stores up to 15 holdings, entered manually, and each ticker's charts supply the figures. Pro compares up to 3 tickers; visitors can preview one comparison.

Recommended tools

ChatGPT

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The Analyze Stock Portfolio Concentration & Fundamentals prompt (Claude, ChatGPT, Gemini, Grok)

Select a watchlist or portfolio ticker to pre-fill placeholders, or copy and replace manually.

You are a senior equity research analyst reviewing a stock portfolio for research purposes. Analyze the holdings in [HOLDINGS_TABLE] over a [TIME_HORIZON] research horizon. If [FINANCIAL_DATA] is provided, treat it as the primary source for company metrics.

## Context
This is an educational research review, not financial advice. Do not suggest buying, selling, holding, trimming, adding to, or rebalancing any position, and do not forecast returns or prices. Use only the data provided, SEC filings, or clearly cited public sources. If a figure is missing, write "not provided" rather than estimating it.

## Required Analysis

### Part 2 - Concentration Profile
- Weight of the largest holding, the top 3 and the top 5.
- Weight by sector and by industry.
- Any ETFs or funds in the list: name their largest underlying holdings and flag overlap with the individual stocks.
- Describe the concentration plainly (e.g. "the top 3 holdings are 58% of the portfolio, all in semiconductors").

### Part 3 - Shared Drivers
Build a matrix of holdings vs common drivers: interest rates, consumer spending, enterprise IT budgets, AI and data-centre capex, commodity prices, a single large customer or supplier, US vs international revenue. Mark each cell High / Medium / Low exposure with a one-line reason from the filings. Then list the 2-3 drivers that the most portfolio weight depends on.

### Part 6 - Balance Sheet and Dilution Watch
- Holdings with rising share counts (dilution) or large buybacks over the last 3-5 years.
- Holdings with significant debt maturing within 3 years.

### Part 7 - Research Gaps
For each holding, list the single most important open question and the filing or data point that would answer it (e.g. "NVDA: data-centre customer concentration, 10-K Item 1A and revenue footnote").

### Part 8 - Visual Verification & Chart Follow-Up
- Name the 3 holdings where a multi-year chart check matters most (e.g. margin trend, share count trend, FCF vs net income) and say which chart to open.
- For each holding, provide the Chartloom research link so the user can inspect the interactive charts: https://www.chartloom.com/c/ticker/[TICKER]
- Suggest the 2-3 holdings with the most driver overlap as the first set to compare side by side.

## Output Format
Tables, headers, bullets. Neutral, evidence-driven language. Do not provide investment advice. Avoid the words "buy", "sell", "hold", "recommendation", "rebalance", or "price target".

**Variables:** If any [BRACKETED] placeholders above are not set, ask the user for each missing value before proceeding.

Variables

Replace these placeholders in the prompt with your own values.

Placeholder	Description	Example
[HOLDINGS_TABLE]	The holdings to review: ticker, company, shares or weights, and sector if known.	AAPL 40 shares, MSFT 25 shares, NVDA 10 shares
[TIME_HORIZON]	Research window for growth, margins, and share-count trends.	5 years
[FINANCIAL_DATA]	Optional figures pasted from filings or charts. Leave blank to have missing metrics marked as not provided.	Revenue, margins, FCF, ROIC, net debt, and multiples by ticker

How to use this prompt

Replace the bracketed fields with the holdings and any figures already collected. Add the holdings to a free Chartloom portfolio (1 portfolio, up to 15 holdings), then open each ticker's charts and paste the same metrics for every name. Pro compares up to 3 tickers side by side; visitors can preview one comparison. Treat the output as a research worksheet and check every figure against the filing.

Tips

Use the same fiscal year and the same metric definition for every holding. Mixed years make the side-by-side table misleading.
If weights are missing, the prompt calculates them from shares and price and states which method it used.
Leave a cell blank when the figure is unknown. The instructions say to write "not provided" instead of estimating it.
FINRA's concentration guidance notes that holdings in the same industry tend to move together, including a sector fund plus several stocks in that sector. Investor.gov treats spreading stock exposure across industry sectors as part of diversification.
Open the three charts named in the last section and compare them with the table before relying on a sharp move.

When to use this prompt

Seeing whether several stocks plus a sector fund are one exposure in practice

Lining up revenue growth, margins, and returns on capital for every holding on the same table

Finding which two or three drivers account for the most portfolio weight

Listing the filing question still open for each company before the next research pass

Updated 2026-10-19

These prompts are research tools, not financial advice. Outputs should be independently verified. They are not a recommendation to buy, sell, or hold any security. See our disclaimer for more information.

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