TickerInside Ownership Index.json API
The Ownership Index.json API from TickerInside — 1 operation(s) for ownership index.json.
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OpenAPI Specification
openapi: 3.2.0
info:
title: TickerInside Ownership Index.json API
version: '1'
summary: Holdings of 5,433 US ETFs, which ETFs hold a stock, and overlap, as static JSON.
description: TickerInside is an open, machine-readable database of US ETF holdings, with the source and date of each holding.
termsOfService: https://tickerinside.com/terms/
contact:
name: TickerInside
email: contact@tickerinside.com
url: https://tickerinside.com/api/
license:
name: CC BY 4.0
identifier: CC-BY-4.0
servers:
- url: https://tickerinside.com/api/v1
description: Static JSON files, and five answers computed from them when asked. No key.
security: []
tags:
- name: Ownership Index.json
paths:
/ownership-index.json:
get:
operationId: getOwnershipIndex
summary: ETF Ownership Index
description: 'The ETF Ownership Index (ti-ownership-index/1). For each stock with a figure in the ownership ledger: the share of its shares outstanding held by the covered US ETFs, at least, the funds counted, and top3_share_pct, the share of those funds'' holdings held by the three funds holding the most. Then the market line, over one line per company, with the cap-weighted share of the companies'' market value the ETFs hold, the mean, the median and the quartiles, and the same line by sector. Its CSV twin, /api/v1/ownership-index.csv, has the same rows. The methodology, with a worked example, is at /etf-ownership/methodology/. A lower bound, like the ledger it reads: funds outside the coverage, and covered funds whose count could not be used, are not in it. Market caps weight the lines and enter no stock''s figure. Under CC BY 4.0.'
externalDocs:
url: https://tickerinside.com/api/#ownership-index
responses:
'200':
description: 'The file. The example is a real answer, shortened: long lists and maps keep their first entries.'
content:
application/json:
schema:
$ref: '#/components/schemas/OwnershipIndex'
example:
name: TickerInside ETF Ownership Index
as_of: '2026-10-12'
method: ti-ownership-index/1
ledger_method: ti-ownership/1
method_url: https://tickerinside.com/api/v1/methods.json
methodology: https://tickerinside.com/etf-ownership/methodology/
holdings_dates:
oldest: '2026-01-31'
newest: '2026-10-12'
shares_outstanding_dates:
oldest: '2025-10-21'
newest: '2026-09-25'
caps_as_of: '2026-10-09'
count: 3592
columns:
- ticker
- company
- sector
stocks:
- - EU
- enCore Energy Corp.
- null
- - ATEN
- A10 Networks, Inc.
- null
- - URG
- Ur Energy Inc
- null
market:
companies: 3481
cap_weighted_pct: 11.41
mean_pct: 10.69
median_pct: 9.96
p25_pct: 3.72
p75_pct: 16.53
companies_without_cap: 246
cap_b: 85003.6
sectors:
- sector: Communication Services
companies: 18
cap_weighted_pct: 9.92
mean_pct: 12.76
median_pct: 12.53
p25_pct: 9.96
p75_pct: 14.46
companies_without_cap: 0
cap_b: 7590.1
- sector: Consumer Discretionary
companies: 47
cap_weighted_pct: 10.29
mean_pct: 13.89
median_pct: 13.62
p25_pct: 11.8
p75_pct: 16.03
companies_without_cap: 0
cap_b: 6706.1
- sector: Consumer Staples
companies: 31
cap_weighted_pct: 11.97
mean_pct: 15.16
median_pct: 14.79
p25_pct: 13.21
p75_pct: 17.13
companies_without_cap: 0
cap_b: 3408.5
class_basis_left_out: 90
concentration_min_funds: 6
concentration_not_published:
fewer_than_6_funds: 431
one_fund_dominant: 5
split_under_3_funds: 1188
held_back: null
failed: false
history: https://tickerinside.com/api/v1/ownership-index/history.json
csv: https://tickerinside.com/api/v1/ownership-index.csv
note: 'Each row of stocks is described by columns: ticker; company; sector, where the price data gives one (the companies of its S&P 500 list); basis, company when the percent is of the company''s shares outstanding, every class counted, class when it is of the ticker''s class alone; pct_lower_bound, at least this percent held by the covered US ETFs (the ledger''s figure); funds_counted; top3_share_pct, the share of those funds'' holdings held by the three funds holding the most, null under 6 funds or where a published sum would give back one fund''s count (concentration_not_published); holdings_newest, the newest holdings date counted; shares_outstanding_as_of, the date of the SEC''s count. market and sectors are over one line per company on a company basis, weighted by market cap for cap_weighted_pct. The changes over 5 and 20 market days are in the history file, under the history terms. A measurement, not investment advice.'
cite_as: 'TickerInside, ETF Ownership Index (ti-ownership-index/1) of 2026-10-12: at least 11.41% of the combined market value of 3,481 US-listed companies held by the covered US ETFs, https://tickerinside.com/api/v1/ownership-index.json, CC BY 4.0'
cite_html: <a href="https://tickerinside.com/api/v1/ownership-index.json">TickerInside</a> (https://tickerinside.com/api/v1/ownership-index.json)
docs: https://tickerinside.com/api/#ownership-index
license: CC BY 4.0
attribution: Credit TickerInside with a link to this file, or to the page that shows the figure, wherever the medium allows a link, and by name where it does not. How you mark the link is up to you.
'304':
description: 'Not modified: the ETag of your copy, sent in If-None-Match, is still current. Files are cached five minutes.'
'503':
description: 'The file could not be served just then: retry after a minute. uptime says whether the site fails its own checks.'
content:
application/json:
schema:
$ref: '#/components/schemas/Unavailable'
tags:
- Ownership Index.json
components:
schemas:
Unavailable:
type: object
additionalProperties: true
required:
- error
- message
- status
- uptime
properties:
error:
type: string
const: unavailable
message:
type: string
status:
type: string
description: The nightly report.
uptime:
type: string
description: 'The live checks: whether the site fails its own checks.'
OwnershipIndex:
type: object
additionalProperties: true
properties:
name:
type:
- string
description: The index's name.
as_of:
type:
- string
- 'null'
description: 'The date of the ownership ledger the index reads: its newest holdings date.'
method:
type:
- string
description: The method of the index, ti-ownership-index/1, in /api/v1/methods.json.
ledger_method:
type:
- string
description: The method of the figures it reads, ti-ownership/1.
method_url:
type:
- string
description: Where both methods are written down, with their test vectors.
methodology:
type:
- string
description: 'The methodology page: formulas, sources, dates, limits and a worked example.'
holdings_dates:
type:
- object
- 'null'
additionalProperties: true
properties:
oldest:
type:
- string
newest:
type:
- string
description: The oldest and newest holdings dates counted across the stocks.
shares_outstanding_dates:
type:
- object
- 'null'
additionalProperties: true
properties:
oldest:
type:
- string
newest:
type:
- string
description: The oldest and newest dates of the SEC's counts of shares outstanding used.
caps_as_of:
type:
- string
- 'null'
description: The price date of the market caps that weight the lines; they enter no stock's figure.
count:
type:
- integer
description: How many stocks have a figure, the rows of stocks.
columns:
type: array
items:
type: string
description: The names of the places of each row of stocks.
stocks:
type: array
items:
type: array
items:
type:
- string
- number
- integer
- boolean
- 'null'
description: One row per stock with a figure, most held first, as columns names them.
market:
type:
- object
- 'null'
additionalProperties: true
properties:
companies:
type:
- integer
description: Companies in the line, one per company on a company basis.
cap_weighted_pct:
type:
- number
- 'null'
description: 'Sum of each company''s figure times its market cap over the sum of their caps, rounded down: the share of their combined market value held by the covered US ETFs, at least.'
mean_pct:
type:
- number
- 'null'
description: The mean of the companies' figures, rounded down.
median_pct:
type:
- number
- 'null'
description: The median company's figure.
p25_pct:
type:
- number
- 'null'
description: The first quartile, by nearest rank.
p75_pct:
type:
- number
- 'null'
description: The third quartile, by nearest rank.
companies_without_cap:
type:
- integer
description: Companies without a market cap, in the mean and quartiles and left out of cap_weighted_pct.
cap_b:
type:
- number
- 'null'
description: The companies' combined market cap, in billions of dollars.
required:
- companies
- cap_weighted_pct
- mean_pct
- median_pct
- p25_pct
- p75_pct
- companies_without_cap
- cap_b
description: 'The line over every company: described below.'
sectors:
type: array
items:
type: object
additionalProperties: true
properties:
sector:
type:
- string
description: The sector, as the price data names it.
companies:
type:
- integer
description: Companies in the line, one per company on a company basis.
cap_weighted_pct:
type:
- number
- 'null'
description: 'Sum of each company''s figure times its market cap over the sum of their caps, rounded down: the share of their combined market value held by the covered US ETFs, at least.'
mean_pct:
type:
- number
- 'null'
description: The mean of the companies' figures, rounded down.
median_pct:
type:
- number
- 'null'
description: The median company's figure.
p25_pct:
type:
- number
- 'null'
description: The first quartile, by nearest rank.
p75_pct:
type:
- number
- 'null'
description: The third quartile, by nearest rank.
companies_without_cap:
type:
- integer
description: Companies without a market cap, in the mean and quartiles and left out of cap_weighted_pct.
cap_b:
type:
- number
- 'null'
description: The companies' combined market cap, in billions of dollars.
required:
- sector
- companies
- cap_weighted_pct
- mean_pct
- median_pct
- p25_pct
- p75_pct
- companies_without_cap
- cap_b
description: 'The line of each sector with at least 5 companies, by name: the same fields and sector.'
class_basis_left_out:
type:
- integer
description: How many figures of one class alone are in stocks and left out of the lines.
concentration_min_funds:
type:
- integer
description: The fewest funds counted for a top3_share_pct.
concentration_not_published:
type: object
additionalProperties:
type: integer
description: How many stocks have a null top3_share_pct, by reason (refusals of ti-ownership-index/1 in methods.json).
held_back:
type:
- object
- 'null'
additionalProperties: true
description: 'Set when tonight''s ledger was held back by its checks: the index then reads the last ledger that passed.'
failed:
type:
- boolean
description: 'True when the index could not be computed tonight: no rows and no lines, the history as it was.'
history:
type:
- string
description: The daily history, with the changes over 5 and 20 market days (history terms).
csv:
type:
- string
description: The rows of stocks as CSV, the same columns.
note:
type:
- string
description: How to read the file.
cite_as:
type:
- string
- 'null'
description: 'A citation line: the index, its date, the market line and this file''s address.'
cite_html:
type:
- string
description: 'The credit as HTML: a link to this file, then its address.'
docs:
type:
- string
description: Where the file is documented.
license:
type:
- string
description: CC BY 4.0.
attribution:
type:
- string
description: Credit TickerInside with a link to this file, or to the page that shows the figure, wherever the medium allows a link, and by name where it does not. How you mark the link is up to you.
required:
- name
- as_of
- method
- ledger_method
- method_url
- methodology
- holdings_dates
- shares_outstanding_dates
- caps_as_of
- count
- columns
- stocks
- market
- sectors
- class_basis_left_out
- concentration_min_funds
- concentration_not_published
- held_back
- failed
- history
- csv
- note
- cite_as
- cite_html
- docs
- license
- attribution
externalDocs:
description: The reference, with examples and recipes
url: https://tickerinside.com/api/