# Market Capitalisation History

> Each listing's daily market capitalisation: its unadjusted close times the shares outstanding known that day, never a later count, with the count's date.

InfoTrie's market capitalisation dataset gives each listing's market value for every trading day: the unadjusted close of InfoTrie's end-of-day prices times the shares outstanding the issuer had reported to the SEC on or before that day. A history never uses a share count reported later, each value says which count it used and whether that count is for the share class or the whole company, and an issuer that stopped reporting for more than 400 days has no market capitalisation rather than a stale one.

Status: In rollout — available on request.

## Key facts

| | |
|---|---|
| Method | Unadjusted close times the shares outstanding known that day |
| Shares | Latest count reported to the SEC on or before the day, at most 400 days old; its date and scope (share class or company) on every value |
| Currency | The listing's trading currency, in major units |
| Grain | One row per listing and trading day |
| Update frequency | Daily, after the end-of-day prices |
| Delivery | REST API (rollout), screener filter, InfoTrie console datasets; plans that include market data |

## Sources

- InfoTrie end-of-day prices (closing price)
- SEC EDGAR (shares outstanding, XBRL filings)

## Data dictionary

| Field | Type | Description |
|---|---|---|
| `isin_key / exchange_code` | string | The listing |
| `price_date` | date | Trading day |
| `close` | number | Unadjusted closing price |
| `shares_outstanding` | number | Shares outstanding used |
| `shares_as_of` | date | The date of that share count |
| `shares_scope` | string | Whether the count is for the share class or the whole company |
| `market_cap` | number | Close times shares outstanding |
| `currency` | string | The listing's trading currency |
| `source` | string | The source of the share count |
| `updated_at` | timestamp | When InfoTrie last loaded the row |

## Use cases

- **Size factors and universes.** Build size buckets and index universes from market values as they were on each day.
- **Screening.** Filter and sort listings by their latest market capitalisation.
- **Weighting.** Weight portfolios or sentiment indices by market value without look-ahead in the share counts.

## Delivery

- REST API (rollout): one listing's daily history, by SYMBOL:EXCHANGE or ISIN, up to ten years per request, JSON, with an API key
- Screener: filter and sort on the latest market capitalisation
- InfoTrie console: the dataset's quality status and its rows, on plans that include market data

## FAQ

### Why the unadjusted close?

Market capitalisation is the price actually quoted that day times the shares that existed that day; an adjusted close would mix in later splits and dividends.

### What if an issuer stops reporting its share count?

A count older than 400 days is not used: the listing then has no market capitalisation for that day rather than a stale one.

## See also

- [Prices: Multi-Venue](https://infotrie.com/price-velocity-multi-venue-integrity)
- [End-of-Day Prices & Technical Indicators](https://infotrie.com/datasets/end-of-day-prices)
- [Quarterly Company Fundamentals](https://infotrie.com/datasets/company-fundamentals)
- [Insider Transactions (SEC Forms 3, 4, 5)](https://infotrie.com/datasets/insider-transactions)
- [API reference (market capitalisation history)](https://infotrie.com/docs/api-reference)
- [Request a sample or a quote](https://infotrie.com/contact)