Who are Taiwan's three major institutional investors?

Foreign investors, investment trusts, and dealers — collectively the 三大法人. TW Market Data provides their daily net buy/sell per stock.

How is this different from US 13F data?

13F filings are quarterly and lag by about 45 days. Taiwan's institutional flow is published daily and per-stock, enabling far more responsive analysis.

Answer

Taiwan institutional investor (three major investors) daily flow data explained

Taiwan publishes the daily net buy/sell of its three major institutional investors — foreign investors, investment trusts, and dealers (三大法人) — for each stock on every trading day. TW Market Data delivers this as a clean daily series, in contrast to US 13F filings, which are quarterly and arrive with a 45-day delay.

Fields and interpretation

foreign_net_buy, investment_trust_net_buy, dealer_net_buy and the total net buy/sell, per stock per trading day.
Because it is daily and per-stock rather than quarterly and delayed, it supports far more responsive research than 13F-style data.

Coverage

TWSE-listed detail is the verified baseline; TPEx per-stock coverage is disclosed on the dataset page. Every response carries source lineage and preserves disclosed data gaps.

See the institutional flow dataset API docs