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Companies & Events

Stock split & par-value events

Name: Stock split & par-value events
Creator: TW Market Data
License: https://twmarketdata.com/en/legal/licensing

Stock split and par-value change events for listed securities — the old and new par value, split ratio and effective date, from the official TWSE / TPEx announcements.

← Stock split & par-value events overview

VerifiedSource: TWSE / TPEx·Plan: free·Cost: 1 credits·GET /v2/datasets/stock-split-par-value-events

Stock split & par-value events is a Taiwan market dataset sourced from TWSE / TPEx, served by TW Market Data as GET /v2/datasets/stock-split-par-value-events.

Overview

stock-split-par-value-events returns one row per split or par-value change with the old and new par value, the resulting share ratio and the effective date, sourced from the official TWSE / TPEx announcements. Each row carries its source role and lineage, so the event is traceable to the exact upstream disclosure.

Field	Type	Description
`market`	string
`security_code`	string
`security_type`	string
`event_type`	string	Normalized event type (e.g. split, par_value_change).
`event_date`	string
`announcement_date`	null
`suspend_trading_date`	null
`resume_trading_date`	string
`par_value_before`	null
`par_value_after`	null
`par_value_ratio`	null
`closing_price_on_last_trading_day`	number
`reference_price`	number
`limit_up_price`	number
`limit_down_price`	number
`opening_reference_price`	number

Coverage

Rows	6
Window	2026-01-09 – 2026-09-07
Grade	Verified
Measured	2026-09-04from 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": "stock_split_par_value_events",
  "request_context": {
    "scope": "stock_split_par_value_events_twse_only",
    "coverage_type": "twse_split_par_value_reference",
    "snapshot_mode": "current_snapshot_only",
    "filters": {
      "market": "TWSE",
      "security_code": "7780",
      "date_from": null,
      "date_to": null,
      "event_type": null,
      "source_family": null,
      "limit": 50
    },
    "min_event_date": "2026-01-09",
    "max_event_date": "2026-01-19"
  },
  "quality": {
    "row_count": 2,
    "security_code_count": 1,
    "sensitive_fields_exposed": false
  },
  "lineage": {
    "source_providers": [
      "twse_official"
    ],
    "source_roles": [
      "official_twse_par_value_change_announcement",
      "official_twse_par_value_change_reference_price"
    ],
    "source_families": [
      "twse_change_of_par_value",
      "twse_reference_price_after_par_value_change"
    ]
  },
  "error": null,
  "data": [
    {
      "market": "TWSE",
      "security_code": "7780",
      "security_type": "stock",
      "event_type": "split_reference_price",
      "event_date": "2026-01-19",
      "announcement_date": null,
      "suspend_trading_date": null,
      "resume_trading_date": "2026-01-19",
      "par_value_before": null,
      "par_value_after": null,
      "par_value_ratio": null,
      "closing_price_on_last_trading_day": 185,
      "reference_price": 18.5,
      "limit_up_price": 20.35,
      "limit_down_price": 16.65,
      "opening_reference_price": 18.5,
      "source_provider": "twse_official",
      "source_role": "official_twse_par_value_change_reference_price",
      "source_family": "twse_reference_price_after_par_value_change",
      "source_event_ref": "TWSE:TWTB8U|7780|2026-01-19",
      "lineage": {
        "source_url": "https://www.twse.com.tw/rwd/en/change/TWTB8U?response=json",
        "source_family": "twse_reference_price_after_par_value_change",
        "official_fields": [
          "Resume Trading Date",
          "Security Code",
          "Closing Price on The Last Trading Day"
        ],
        "source_row_type": "reference_price"
      },
      "data_gaps": [
        "announcement_date_missing"
      ]
    },
    {
      "market": "TWSE",
      "security_code": "7780",
      "security_type": "stock",
      "event_type": "par_value_change",
      "event_date": "2026-01-09",
      "announcement_date": null,
      "suspend_trading_date": "2026-01-09",
      "resume_trading_date": "2026-01-19",
      "par_value_before": 10,
      "par_value_after": 1,
      "par_value_ratio": 10,
      "closing_price_on_last_trading_day": 185,
      "reference_price": 18.5,
      "limit_up_price": 20.35,
      "limit_down_price": 16.65,
      "opening_reference_price": 18.5,
      "source_provider": "twse_official",
      "source_role": "official_twse_par_value_change_announcement",
      "source_family": "twse_change_of_par_value",
      "source_event_ref": "TWSE:TWTB7U|7780|2026-01-09|2026-01-19",
      "lineage": {
        "source_urls": {
          "TWTB7U": "https://www.twse.com.tw/rwd/en/change/TWTB7U?response=json",
          "TWTB8U": "https://www.twse.com.tw/rwd/en/change/TWTB8U?response=json"
        },
        "source_family": "twse_change_of_par_value",
        "official_fields": [
          "Suspend Trading Date",
          "Security Code",
          "Resume Trading Date"
        ],
        "source_row_types": [
          "announcement",
          "reference_price"
        ],
        "reference_price_source": "TWTB8U"
      },
      "data_gaps": [
        "announcement_date_missing"
      ]
    }
  ],
  "data_count": 2,
  "known_gaps": [
    "twse_only_scope",
    "no_tpex_coverage",
    "no_unified_security_lifecycle_claim"
  ],
  "warnings": [
    "not_investment_advice",
    "twse_only_scope"
  ],
  "not_investment_advice": true,
  "envelope": {
    "dataset_id": "stock_split_par_value_events",
    "scope": "stock_split_par_value_events_twse_only",
    "row_count": 2
  }
}

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

Provenance

These columns are returned alongside the data and record where the row came from. They are provenance, not the dataset's subject matter, so they are listed here rather than in the field table.

source_providersource_rolesource_familysource_event_reflineagedata_gaps

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. (n.d.). Stock split & par-value events [Data set]. TW Market Data. Retrieved 2026-09-05, from https://twmarketdata.com/en/docs/api/companies-events/stock-split-par-value-events

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.

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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/stock-split-par-value-events?security_code=7780" \
  -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/stock-split-par-value-events",
    params={"security_code": "7780"},
    headers={"X-API-Key": "sk_live_..."},
)
resp.raise_for_status()
print(resp.json()["data"])

OpenAPI

This endpoint is GET /v2/datasets/stock-split-par-value-events. The full machine-readable schema (parameters, security, response envelope) lives in the OpenAPI spec.

Notes & limitations

Par-value and split events change the share base: when joining to a raw price series, apply the effective date so pre- and post-event prices are compared on the same basis.

Request & Response

Request

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

Response

{
  "dataset_id": "stock_split_par_value_events",
  "quality": {
    "row_count": "<number>",
    "security_code_count": "<number>",
    "sensitive_fields_exposed": "<boolean>"
  },
  "error": null,
  "data": [
    {
      "market": "<string>",
      "security_code": "<string>",
      "security_type": "<string>",
      "event_type": "<string>",
      "event_date": "<string>",
      "announcement_date": "<null>",
      "suspend_trading_date": "<null>",
      "resume_trading_date": "<string>",
      "par_value_before": "<null>",
      "par_value_after": "<null>",
      "par_value_ratio": "<null>",
      "closing_price_on_last_trading_day": "<number>",
      "reference_price": "<number>",
      "limit_up_price": "<number>",
      "limit_down_price": "<number>",
      "opening_reference_price": "<number>",
      "source_provider": "<string>",
      "source_role": "<string>",
      "source_family": "<string>",
      "source_event_ref": "<string>",
      "lineage": {
        "source_url": "<string>",
        "source_family": "<string>",
        "official_fields": "<array>",
        "source_row_type": "<string>"
      },
      "data_gaps": "<array>"
    }
  ],
  "data_count": 2,
  "known_gaps": [
    "<string>"
  ],
  "warnings": [
    "<string>"
  ],
  "not_investment_advice": true,
  "envelope": {
    "dataset_id": "<string>",
    "scope": "<string>",
    "row_count": "<number>"
  }
}