V3_OPTION_FLAT_FILE_OPEN_INTEREST()

Pro

Bulk download all option open interest ticks for a given date as a CSV stream. Returns one row per tick, grouped by contract. Requires a Professional options subscription.

Expected response time: ~1 minute. Expected file size: ~50 MB.

Only the 7 most recent calendar days are available; data for the previous day is typically ready by 12:30-1am ET. See Flat Files Getting Started for details, or contact sales for more history.

Example

=THETADATA.V3_OPTION_FLAT_FILE_OPEN_INTEREST("20260803")

Parameters

dateRequired  -

The date to fetch data for.

Type: string

Behavior: Required.

Returns

A grid (string[][]) - a header row followed by one row per result. See the REST API reference for the full response schema.