Market Overview Snapshots

Each row is one market's daily overview snapshot, carrying market_code / as_of_date / index_level / index_change / index_change_pct / advancers / decliners / unchanged (market code, as-of date, index level, index change, change %, advancers, decliners, and unchanged). Sourced from the TWSE, graded reference / master. The backend /v2/datasets meta exposes only grade / tier / point-in-time and no coverage window, so none is stated here.

Disclosure data carries a knowledge date on every row, set conservatively to the statutory filing deadline — so a backtest filtered on it cannot see a figure before the market could.

A knowledge date on every disclosure row — Monthly revenue, income statement, balance sheet and cash flow all carry knowledge_date, alongside kd_source saying where it came from and kd_imputed saying whether it was observed or derived. Align on that column rather than on the period end date and a figure enters your backtest when it entered the market, not when the quarter closed.

It is the statutory deadline, which is late by design — Measured 2026-08-19: for every disclosure dataset checked, kd_source is statutory_deadline and kd_imputed is true — the date is the filing deadline in law, not the observed announcement, which we do not yet capture. Companies file on or before the deadline, so this is late rather than early: a fast filer looks slower than it was. That costs realism and it cannot leak, which is the safe direction to be wrong in.

Daily prices do not carry one — twse_daily_price has no knowledge_date column. For an end-of-day price the trade date is the publication date, so the gap is narrow — but it is a real gap, and an agent that assumes the column is universal will get an undefined rather than a date. Per-dataset point-in-time status is listed on the coverage page.

The registry records no gap disclosure and no column gap for this dataset. That is the absence of a recorded gap, not a guarantee that none exists.

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.