/api/v1/ownership/analytics/ownership-concentration/{cik}Ownership concentration metrics for an issuer.
Ownership concentration metrics for an issuer.
10 tokensSince v3.0.0
Why use this
Quantitative concentration metrics for one issuer's ownership structure: top-5 / top-10 / top-25 holder share, Herfindahl-Hirschman Index of holder concentration, and the institutional-vs-insider split. The right endpoint for screening on float-pressure thesis ('find issuers where >70% of float is held by ≤5 funds, then look for cluster buys at lower levels') and for assessing concentration risk in covered names. Pair with `/ownership/analytics/threshold-crossings` to surface the recent filings that drove changes in these metrics, and with `/ownership/beneficial-ownership/issuers/{cik}/summary` for the underlying holder list.
Common use case
Assess ownership concentration risk, identify companies with highly concentrated ownership.
Issuer-level ownership concentration metrics — Herfindahl index, top-N holder share, retail-vs-institutional split. Useful for screening on float-pressure thesis (e.g. find issuers where >70% of float is held by ≤5 funds, then look for cluster buys at lower levels).
Parameters
| Name | In | Required | Default | Allowed | Description | Example |
|---|---|---|---|---|---|---|
| cik | path | required | — | — | Issuer CIK (the company being analyzed). Accepts both 10-char zero-padded form (`0000320193`) and unpadded (`320193`). Returns 404 when no ownership filings (13F + 13D/G + Form 4) have ever surfaced this issuer. | 0000320193 |
Response schema
| Field | Type | Nullable | Description |
|---|---|---|---|
| issuerCik | string | no | Issuer CIK echoed back in 10-char zero-padded form regardless of input. |
| issuerTicker | string | yes | Resolved issuer ticker (canonical hyphen form). Null when issuer has no public-equity ticker. |
| asOf | string | no | ISO-8601 UTC timestamp of the most-recent filing contributing to the metrics computation. Concentration metrics are recomputed on the `sec_13f_summary` matview refresh cadence (~6 hours). |
| top5Percent | number | no | Aggregate `percent_of_class` held by the top-5 holders by position size (sum, not mean). Above 30% indicates highly concentrated ownership; above 50% indicates float-constrained ownership where 5 funds effectively control the company. Tech mega-caps (AAPL, MSFT) typically sit at 22-28%; activist-held mid-caps can reach 40-60%. |
| top10Percent | number | no | Aggregate `percent_of_class` held by the top-10 holders. The standard institutional-concentration metric (Sharpe, Damodaran). Values above 50% indicate the most-impactful 10 holders effectively control the float; below 30% indicates broad institutional dispersion. |
| top25Percent | number | no | Aggregate `percent_of_class` held by the top-25 holders. The 'tail of the distribution' metric — gap between top10 and top25 indicates how concentrated the long tail is. Index-fund-heavy names (mega caps) have small gaps (top10 ~30%, top25 ~50%); activist-targeted names have larger gaps (concentrated top-5, dispersed long tail). |
| herfindahl | number | no | Herfindahl-Hirschman Index (HHI) of holder concentration on a 0-10000 scale (sum of squared percent shares × 100). Below 1500 = unconcentrated (broad ownership); 1500-2500 = moderately concentrated; above 2500 = highly concentrated (FTC merger-review threshold). The single-number summary metric used in academic literature. |
| institutionalPercent | number | no | Aggregate institutional ownership percentage — sum of all 13F-HR-reported positions normalized against shares outstanding. Mega-caps (AAPL, MSFT) typically 60-75%; small-caps 30-50%; closely-held names < 20%. The complement of retail-+-insider ownership. |
| insiderPercent | number | no | Aggregate insider ownership percentage from Form 4 / Form 3 / Form 5 filings — the cumulative `total_beneficial_ownership` of all insiders normalized against shares outstanding. Founder-led companies (TSLA, META, SHOP) typically 5-25%; mature large-caps < 1%. High `insiderPercent` correlates with founder-CEO governance regimes. |
Sample response
·
- "issuerCik": "0000320193"
- "issuerTicker": "AAPL"
- "asOf": "2026-05-01T20:55:12.000Z"
- "top5Percent": 22.4
- "top10Percent": 31.7
- "top25Percent": 48.3
- "herfindahl": 412.6
- "institutionalPercent": 61.8
- "insiderPercent": 0.07
Errors
| Status | Label | Description |
|---|---|---|
| 200 | OK | Request succeeded. |
| 400 | Bad Request | Invalid query, body, or path parameter. |
| 401 | Unauthorized | Missing or invalid Authorization header / api_Token. |
| 402 | Payment Required | Insufficient token balance for this call. Top up |
| 429 | Too Many Requests | Rate limit exceeded for your tier (see /pricing for tier limits). Tier limits |
| 500 | Server Error | Unexpected server-side failure. Retry with backoff; report if persistent. |
Code samples
curl "https://api.finradar.ai/api/v1/ownership/analytics/ownership-concentration/{cik}?api_Token=YOUR_API_KEY" \
-H "Authorization: Bearer YOUR_JWT_TOKEN"Generate an API key in /account/credentials to run live queries (literal YOUR_API_KEY placeholder shown until then).