Taiwan OTC Stock Institutional Trades (TPEx)

Get structured JSON access to daily institutional flow data for Taiwan's OTC market (TPEx / 櫃買中心) — foreign investors, investment trusts, and proprietary dealers' net buy/sell positions for every OTC-listed stock.

This is the OTC-market companion to TWSE Institutional Trades. Use both to cover Taiwan's entire equity market.

Why this data matters

Taiwan's OTC market (TPEx) hosts many of the island's hottest small/mid-cap tech names — IC design houses, IP providers, and semiconductor supply-chain companies. Institutional flows are a widely-watched signal here:

• Foreign investors dominate turnover in leading OTC names
• Investment trust (投信) buying is a classic small-cap momentum signal in Taiwan
• Dealer hedging flows reveal derivative-linked positioning

The data is public on TPEx's website but inconvenient to consume programmatically. This Actor normalizes it into clean JSON you can pipe into research jobs, dashboards, or alerts.

Output

One record per stock per trading day, 24 normalized fields:

{
  "date": "2026-07-02",
  "stock_code": "5274",
  "stock_name": "信驊",
  "foreign_buy": 178673,
  "foreign_sell": 130324,
  "foreign_net": 48349,
  "foreign_dealer_buy": 0,
  "foreign_dealer_sell": 0,
  "foreign_dealer_net": 0,
  "foreign_total_buy": 178673,
  "foreign_total_sell": 130324,
  "foreign_total_net": 48349,
  "trust_buy": 3075,
  "trust_sell": 5270,
  "trust_net": -2195,
  "dealer_prop_buy": 0,
  "dealer_prop_sell": 0,
  "dealer_prop_net": 0,
  "dealer_hedge_buy": 2983,
  "dealer_hedge_sell": 6070,
  "dealer_hedge_net": -3087,
  "dealer_total_buy": 2983,
  "dealer_total_sell": 6070,
  "dealer_total_net": -3087,
  "total_institutional_net": 43067
}

All share counts are integers (shares, not lots).

Input

Field	Type	Description
startDate	string (required)	YYYY-MM-DD
endDate	string	YYYY-MM-DD inclusive; empty = single day
stockCodes	array	Optional filter, e.g. ["5274", "3105"]. Empty = all (~900 stocks/day)

Example — fetch one week of flows for ASPEED (信驊) and WIN Semi (穩懋):

{
  "startDate": "2026-06-26",
  "endDate": "2026-07-02",
  "stockCodes": ["5274", "3105"]
}

Pricing & cost control

Pay per result: $0.50 / 1,000 records.

• Full market, one day: ~900 records ≈ $0.45
• Filtered to 5 tickers, one month: ~110 records ≈ $0.06

Use stockCodes to keep costs minimal when you only track a watchlist.

Data source & reliability

• Direct from TPEx's official daily institutional trades feed (三大法人買賣明細)
• Weekends skipped automatically; market holidays return no rows and are skipped
• Column-count guard: if TPEx changes its schema, the run fails loudly instead of returning silently corrupted data

Use cases

• Quant factor research on Taiwan small/mid-caps
• 投信認養 (trust accumulation) screeners and alerts
• Financial dashboards and newsletters
• Academic research on institutional behavior in OTC markets

Related Actors

• TWSE Institutional Trades — same data for Taiwan's main board
• Taiwan Government Tender Monitor
• Taiwan Legislator Monitor

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Taiwan Market Data Suite

This Actor is part of a suite of 25 Taiwan market data APIs by chamarix — official sources only, cross-validated against independent official endpoints, clean JSON out. Code samples for the whole suite: GitHub.

Market data:

• taiwan-stock-daily-quotes — Daily OHLCV, VWAP, P/E, price-to-book & dividend yield for every listed/OTC stock since 2004
• twse-institutional-trades — Daily institutional buy/sell (foreign, investment trust, dealer) per stock — TWSE listed
• tpex-institutional-trades — Daily institutional buy/sell per stock — TPEx OTC market
• taiwan-monthly-revenue — Monthly revenue of 1,900+ listed & OTC companies, MoM/YoY
• taiwan-financial-statements — Quarterly income statement, balance sheet & cash flow back to 2013
• taiwan-dividend-calendar — Ex-dividend / ex-rights dates, reference prices & payouts back to 2003
• taiwan-margin-trading — Daily margin trading & short sale balances per stock
• taiwan-sbl-short-sale-balance — Securities-lending short sale balances per stock
• taiwan-day-trading-stats — Day-trading volume, value & ratio per stock since 2014
• tdcc-shareholding-dispersion — Weekly TDCC shareholding dispersion (retail vs whale structure)
• taiwan-foreign-shareholding — Foreign ownership percentage & remaining quota per stock
• taifex-institutional-derivatives — Institutional futures & options positions (TAIFEX), incl. put/call ratio
• taifex-options-chain — Full options chain by strike & expiry, both sessions, with the exchange's own Delta, since 2001
• taiwan-warrants-daily — Daily quotes, strike, expiry & moneyness for every listed/OTC warrant since 2004
• taiwan-stock-alerts — Watch-list, disposition & short-sale suspension alerts
• taiwan-insider-share-transfers — Insider share-transfer filings (directors, officers, 10% holders) since 2002
• taiwan-director-shareholdings — Monthly director/officer shareholdings & share-pledge ratio since 1999
• taiwan-block-trades — Every block trade (鉅額交易) with price, size & basket constituents since 2005
• taiwan-shareholder-meetings — Shareholder meeting dates, book closure periods & e-voting since 2005
• taiwan-emerging-stock-quotes — Emerging (興櫃) board quotes, pre-IPO register & history since 2003
• taiwan-etf-regular-investment — Monthly regular savings plan (定期定額) rankings for stocks & ETFs since 2020
• taiwan-treasury-stock-buybacks — Every treasury-stock buyback (庫藏股) filing, plan vs execution, since 2000

Property market:

• taiwan-real-estate-transactions — Actual registered sale, presale & lease prices (實價登錄) for all 22 cities since 2012

Government & civic data:

• taiwan-legislator-monitor — Legislative Yuan bills, legislators & meetings
• taiwan-tender-monitor — Government e-procurement tenders (open calls, awards, failures)