Company Market Cap

Company Market Cap

Retrieve the current market capitalization for a single company using the Octagon MCP server.

Prerequisites

Ensure Octagon MCP is configured in your AI agent (Cursor, Claude Desktop, Windsurf, etc.). See [references/mcp-setup.md](references/mcp-setup.md) for installation instructions.

Workflow

1. Identify the Stock

Determine the ticker symbol for the company you want to analyze (e.g., AAPL, MSFT, GOOGL).

2. Execute Query via Octagon MCP

Use the octagon-agent tool with a natural language prompt:

Get market capitalization data for the symbol .

MCP Call Format:

{
  "server": "octagon-mcp",
  "toolName": "octagon-agent",
  "arguments": {
    "prompt": "Get market capitalization data for the symbol AAPL."
  }
}

3. Expected Output

The agent returns precise market cap data:

| Date | Market Capitalization (USD) | |------|----------------------------| | 2026-02-02 | $3,968,586,877,215.00 |

Additional context provided:

• Rounded value (e.g., $3.97 trillion)
• As-of date for the data
• Data source

Data Sources: octagon-stock-data-agent

4. Interpret Results

See [references/interpreting-results.md](references/interpreting-results.md) for guidance on:

• Understanding market cap magnitude
• Size classification
• Valuation context
• Historical comparison

Example Queries

Basic Query:

Get market capitalization data for the symbol AAPL.

With Context:

What is the current market cap for Tesla?

Historical Reference:

What is Microsoft's market capitalization and how has it changed recently?

Valuation Context:

What is NVDA's market cap and how does it compare to other chipmakers?

Size Classification:

What size category is AMD based on its market cap?

Understanding Market Cap

Definition

Market Cap = Current Share Price × Shares Outstanding

What It Represents

| Aspect | Description | |--------|-------------| | Total Value | Market's valuation of all shares | | Size Indicator | Company scale and influence | | Index Weight | Determines index composition | | Acquisition Cost | Theoretical buyout price |

What It Doesn't Represent

| Misconception | Reality | |---------------|---------| | Intrinsic Value | Market perception, not fundamental worth | | Book Value | Different from accounting value | | Enterprise Value | Excludes debt and cash | | Sale Price | Acquisitions often have premiums |

Size Classifications

Standard Categories

| Category | Range | Characteristics | |----------|-------|-----------------| | Mega-cap | >$200B | Global leaders, household names | | Large-cap | $10B-$200B | Established, stable companies | | Mid-cap | $2B-$10B | Growth potential, moderate risk | | Small-cap | $300M-$2B | Higher growth, higher volatility | | Micro-cap | $50M-$300M | Speculative, limited coverage | | Nano-cap | $1T | Elite status, massive scale | | >$2T | Global economic influence | | >$3T | Among world's most valuable |

Market Cap Analysis

Valuation Ratios

| Ratio | Formula | Purpose | |-------|---------|---------| | P/E | Market Cap / Net Income | Earnings valuation | | P/S | Market Cap / Revenue | Revenue valuation | | P/B | Market Cap / Book Value | Asset valuation | | PEG | P/E / Growth Rate | Growth-adjusted value |

Enterprise Value Comparison

| Metric | Calculation | |--------|-------------| | Enterprise Value | Market Cap + Debt - Cash | | EV/EBITDA | EV / Operating earnings | | EV/Revenue | EV / Total revenue |

Contextual Analysis

Industry Comparison

| Question | Purpose | |----------|---------| | Largest in sector? | Market leadership | | Above/below median? | Relative positioning | | Gap to leader? | Distance from top |

Historical Perspective

| Timeframe | Analysis | |-----------|----------| | 1 Year | Recent performance | | 5 Years | Medium-term trend | | 10 Years | Long-term growth | | All-time High | Peak valuation |

Global Context

| Comparison | Purpose | |------------|---------| | vs. Global Leaders | Scale perspective | | vs. Country GDP | Economic significance | | vs. Index Total | Market weight |

Factors Affecting Market Cap

Price Drivers

| Factor | Impact | |--------|--------| | Earnings | Fundamental driver | | Growth | Future expectations | | Sentiment | Market psychology | | Macro | Economic conditions |

Share Count Changes

| Event | Effect | |-------|--------| | Buybacks | Reduces shares, concentrates value | | Issuance | Increases shares, dilutes | | Stock Split | No effect (price adjusts) | | Spin-offs | Separates value |

Common Use Cases

Investment Analysis

What is the market cap for XYZ and how does it compare to peers?

Portfolio Context

What is the market capitalization of my largest holding, AAPL?

News Context

Apple's market cap after today's earnings announcement?

Valuation Check

Is TSLA's market cap justified relative to its revenue?

Analysis Tips

1. Use precise values: Full number for calculations, rounded for communication.

1. Note the date: Market cap changes constantly with price.

1. Consider float: Some shares may not be tradeable.

1. Compare appropriately: Same industry, similar business models.

1. Understand drivers: Price appreciation vs. share changes.

1. Enterprise value: Add debt consideration for M&A context.

Integration with Other Skills

| Skill | Combined Use | |-------|--------------| | stock-quote | Market cap + current price details | | batch-market-cap | Single company vs. peer group | | income-statement | Market cap vs. earnings | | balance-sheet | Market cap vs. book value | | financial-metrics-analysis | Full valuation analysis |

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: OctagonAI
• Source: OctagonAI/skills
• License: MIT
• Homepage: https://octagonai.co

Install and usage instructions live in the source repository linked above.