Stock Market Indices · Data API

S&P 500 Company Constituents

The current list of companies in the S&P 500 stock index, with sector and headquarters.

A reference list of every company currently in the S&P 500 index, with ticker symbol, company name, industry sector and sub-industry, headquarters location, date added to the index, SEC CIK number and founding year. Fintech startups, trading bots, portfolio tools and AI research agents use it to screen large-cap US equities and map tickers to sectors.

Get API key View docs

Source: datasets/s-and-p-500-companies (Open Knowledge Foundation Data Packages) · ODC-PDDL-1.0 · S&P 500 constituents data from the datasets/s-and-p-500-companies project (github.com/datasets)

Endpoints

Every request is authenticated with your X-API-Key and counted against your plan.

GET /v1/data/s-p-500-company-constituents
GET /v1/data/s-p-500-company-constituents/search?q=...
GET /v1/data/s-p-500-company-constituents/{key}

Base path /v1/data/s-p-500-company-constituents · full reference in the interactive docs. Also exposed as an MCP tool for AI agents.

Fields

Field	Type	Description
symbol	str	Stock ticker symbol
security	str	Company name
gics_sector	str	Industry sector
gics_sub_industry	str	Industry sub-category
headquarters_location	str	City and state of company headquarters
date_added	str	Date the company joined the index
cik	str	SEC Central Index Key
founded	str	Year the company was founded

What you get

All current S&P 500 members

Ticker lookup and company name search

Filter by sector and sub-industry

SEC CIK for joining to filings

Date each company joined the index

FAQ

How often is the list updated?: It is refreshed from the open-source source dataset whenever index changes are published there.
Does it include stock prices?: No, this is a reference list of index members, not price data.

Pricing

Simple, transparent pricing

Start free, upgrade when you need more. All plans include full API access.

Free

$0forever

Get started and explore the API

100 requests/day

100 API requests per day
All endpoints included
Community support

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Pro

$9/month

For production apps and AI agents

10,000 requests/day

10,000 API requests per day
All endpoints included
Priority support
Usage dashboard

Upgrade to Pro

Enterprise

$49/month

Unlimited access for high-volume use

Unlimited requests

Unlimited API requests
All endpoints included
Priority support
Usage dashboard
Dedicated support channel

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Getting Started

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Register

Create an account to get your API key. It's free — no credit card required.

curl -X POST https://api.aristocles.com.au/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com", "name": "Your Name"}'

Make a request

Use your API key in the X-API-Key header to authenticate requests.

curl https://api.aristocles.com.au/v1/data/asx \
  -H "X-API-Key: your_api_key_here"

Upgrade

Need more requests? Upgrade to Pro or Enterprise — you'll be redirected to Stripe Checkout.

curl -X POST "https://api.aristocles.com.au/v1/billing/checkout?tier=pro" \
  -H "X-API-Key: your_api_key_here"

Check usage

Monitor your daily request count and remaining quota at any time.

curl https://api.aristocles.com.au/v1/usage \
  -H "X-API-Key: your_api_key_here"