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Capital Flows

Shareholding Concentration (TDCC tiers)

Name: Shareholding Concentration (TDCC tiers)
Creator: TW Market Data
License: https://twmarketdata.com/en/legal/licensing

Per-ticker TDCC big-holder concentration: total holder count, count and % held by ≥400-lot and ≥1000-lot holders, retail %, and week-over-week deltas. Derived from the TDCC 15-tier distribution. Not a forecast, not a recommendation.

← Shareholding Concentration (TDCC tiers) overview

DerivedSource: TDCC·Plan: starter·Cost: 2 credits·GET /v2/datasets/shareholding-concentration

Shareholding Concentration (TDCC tiers) is a Taiwan market dataset sourced from TDCC, served by TW Market Data as GET /v2/datasets/shareholding-concentration, with data as of 2026-05-29.

Data as of 2026-05-29 (report_date).

Overview

Field	Type	Description
`ticker`	string
`market`	string
`report_date`	string
`tier_map_version`	string
`holder_count_total`	number
`large_holder_count_400`	number	≥400 lots
`large_holder_pct_400`	number
`large_holder_pct_1000`	number	≥1000 lots
`retail_pct`	number
`large_holder_pct_400_wow_delta`	null
`large_holder_pct_1000_wow_delta`	null	NULL on single snapshot
`retail_pct_wow_delta`	null
`holder_count_total_wow_delta`	null

Coverage

Window	2026-05-29 – 2026-09-04
Grade	Derived
Measured	2026-09-01from the dataset registry

Example response

A real response from this endpoint. Rows are returned under "data", and provenance is carried in the shape shown below — it is not identical across datasets, so read this page's rather than assuming another's.

{
  "dataset_id": "shareholding_concentration",
  "request_context": {
    "scope": "tw_shareholding_concentration_weekly",
    "coverage_type": "weekly_series_accumulating_forward",
    "filters": {
      "ticker": null,
      "report_date": null,
      "date_from": null,
      "date_to": null,
      "limit": 50
    },
    "min_report_date": "2026-07-31",
    "max_report_date": "2026-07-31"
  },
  "quality": {
    "row_count": 50,
    "distinct_report_dates_in_dataset": 2,
    "weekly_history_depth": "multi_week",
    "wow_deltas_meaningful": true,
    "sensitive_fields_exposed": false
  },
  "lineage": {
    "tier_map_versions": [
      "tdcc_15tier_v1"
    ],
    "semantics": "<Chinese value - see the zh page>"
  },
  "error": null,
  "data": [
    {
      "ticker": "00400A",
      "market": "TWSE",
      "report_date": "2026-07-31",
      "tier_map_version": "tdcc_15tier_v1",
      "holder_count_total": 139946,
      "large_holder_count_400": 215,
      "large_holder_pct_400": 0.154,
      "large_holder_pct_1000": 0.1078,
      "retail_pct": 0.0016,
      "large_holder_pct_400_wow_delta": null,
      "large_holder_pct_1000_wow_delta": null,
      "retail_pct_wow_delta": null,
      "holder_count_total_wow_delta": null
    },
    {
      "ticker": "00401A",
      "market": "TWSE",
      "report_date": "2026-07-31",
      "tier_map_version": "tdcc_15tier_v1",
      "holder_count_total": 17130,
      "large_holder_count_400": 27,
      "large_holder_pct_400": 0.2482,
      "large_holder_pct_1000": 0.2179,
      "retail_pct": 0.0015,
      "large_holder_pct_400_wow_delta": null,
      "large_holder_pct_1000_wow_delta": null,
      "retail_pct_wow_delta": null,
      "holder_count_total_wow_delta": null
    }
  ],
  "data_count": 50,
  "known_gaps": [
    "weekly_series_accumulating_forward_from_2026_08_not_a_backfilled_history",
    "tdcc_bulk_feed_serves_the_current_week_only_no_archive_exists_to_backfill_from",
    "served_from_a_view_freshness_follows_tdcc_shareholding_distribution_items"
  ],
  "warnings": [
    "not_investment_advice"
  ],
  "envelope": {
    "dataset_id": "shareholding_concentration",
    "scope": "tw_shareholding_concentration_weekly",
    "row_count": 50
  }
}

Captured from the live API on 2026-07-20.

Chinese data values are shown as a marker here so this page stays in English; the /zh page shows them verbatim.

Licence and attribution

Part of the data in this service is obtained from the Government Open Data Platform (data.gov.tw) and used under the Open Government Data License, version 1.0. Providing agencies: Taiwan Stock Exchange, Taipei Exchange, Taiwan Futures Exchange, Taiwan Depository & Clearing Corporation, National Development Council, Central Bank of the Republic of China (Taiwan), Department of Statistics of the Ministry of Economic Affairs, and Customs Administration of the Ministry of Finance. The value-added processing, derived calculations and presentation in this service are the responsibility of TWMD and are not associated with the providing agencies.

Cite this dataset

TW Market Data. (2026). Shareholding Concentration (TDCC tiers) (Version 2026-05-29) [Data set]. TW Market Data. Retrieved 2026-09-06, from https://twmarketdata.com/en/docs/api/capital-flows/shareholding-concentration

The version is the dataset's own as_of, not the date this page was built. Where we have no as_of the field is left out rather than filled in. Check a signature

Datasets that join with this one. The key each pair aligns on is shown, so you can plan a multi-table query without guessing.

Day-trading suspension
Joins on market + ticker
Foreign holding
Joins on market + ticker
Institutional flow
Joins on market + ticker
Securities-Lending Utilization
Joins on market + ticker
Margin & short
Joins on market + ticker

Getting started

Put your key in the X-API-Key header.
Add query parameters (symbol, date range, limit).
Send the request and read the data array.

curl "https://api.twmarketdata.com/v2/datasets/shareholding-concentration" \
  -H "X-API-Key: sk_live_..."

Filtering

Parameter	Required	Type	Description
`symbol`	Yes	string	Ticker, e.g. 2330.
`start_date`	No	string (YYYY-MM-DD)	Start of the query range.
`end_date`	No	string (YYYY-MM-DD)	End of the query range.
`limit`	No	integer	Maximum rows to return.

Python

import requests

resp = requests.get(
    "https://api.twmarketdata.com/v2/datasets/shareholding-concentration",
    params={},
    headers={"X-API-Key": "sk_live_..."},
)
resp.raise_for_status()
print(resp.json()["data"])

OpenAPI

This endpoint is GET /v2/datasets/shareholding-concentration. The full machine-readable schema (parameters, security, response envelope) lives in the OpenAPI spec.

Request & Response

Request

curl "https://api.twmarketdata.com/v2/datasets/shareholding-concentration?symbol=2330&start_date=2026-01-01&end_date=2026-06-30&limit=5" \
  -H "X-API-Key: $TWMD_API_KEY"

Response

{
  "dataset_id": "shareholding_concentration",
  "quality": {
    "row_count": "<number>",
    "distinct_report_dates_in_dataset": "<number>",
    "weekly_history_depth": "<string>",
    "wow_deltas_meaningful": "<boolean>",
    "sensitive_fields_exposed": "<boolean>"
  },
  "error": null,
  "data": [
    {
      "ticker": "<string>",
      "market": "<string>",
      "report_date": "<string>",
      "tier_map_version": "<string>",
      "holder_count_total": "<number>",
      "large_holder_count_400": "<number>",
      "large_holder_pct_400": "<number>",
      "large_holder_pct_1000": "<number>",
      "retail_pct": "<number>",
      "large_holder_pct_400_wow_delta": "<null>",
      "large_holder_pct_1000_wow_delta": "<null>",
      "retail_pct_wow_delta": "<null>",
      "holder_count_total_wow_delta": "<null>"
    }
  ],
  "data_count": 50,
  "known_gaps": [
    "<string>"
  ],
  "warnings": [
    "<string>"
  ],
  "envelope": {
    "dataset_id": "<string>",
    "scope": "<string>",
    "row_count": "<number>"
  }
}