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