Taiwan ADR Premium Tracker

Track real-time price premiums and discounts between Taiwan ADRs listed on NYSE/NASDAQ and their underlying Taiwan Stock Exchange (TWSE) shares — with full USD/TWD currency normalization.

What This Actor Does

Taiwan has more cross-listed ADRs than almost any other Asian market. When a stock trades on both NYSE and TWSE simultaneously, the price difference (the "ADR premium") can be significant — TSMC's ADR premium hit a 25% historic high in 2025, representing a major signal for cross-market traders, fund managers, and quantitative researchers.

This actor fetches live prices for all major Taiwan ADRs and computes the exact premium or discount in USD terms, accounting for:

• ADS ratio — e.g. 1 TSM ADR = 5 shares of 2330.TW
• FX normalization — USD/TWD exchange rate applied automatically
• 6 Taiwan ADRs tracked: TSM, UMC, CHT, ASX, HIMX, IMOS

Covered Ticker Pairs

ADR (NYSE/NASDAQ)	TW Share (TWSE)	ADS Ratio	Company
TSM	2330.TW	1:5	Taiwan Semiconductor Mfg (TSMC)
UMC	2303.TW	1:2	United Microelectronics
CHT	2412.TW	1:10	Chunghwa Telecom
ASX	3711.TW	1:1	ASE Technology Holding
HIMX	3324.TW	1:2	Himax Technologies
IMOS	8150.TW	1:20	ChipMOS Technologies

Tutorial — How to Run

1. Open the actor on Apify Store and click Try for free.
2. In the Input tab, set the tickers field to the ADR symbols you want to track (or leave blank for all six).
3. Click Start and wait ~10–20 seconds for prices to be fetched.
4. View results in the Output tab — each run produces one dataset row with all premiums.

Example input:

{
  "tickers": ["TSM", "UMC", "CHT"]
}

Example output:

{
  "scraped_at": "2026-03-27T10:00:00Z",
  "fx_rate_usd_twd": 32.45,
  "tickers_requested": 3,
  "tickers_computed": 3,
  "results": [
    {
      "adr_ticker": "TSM",
      "tw_ticker": "2330.TW",
      "company_name": "Taiwan Semiconductor Mfg (TSMC)",
      "exchange": "NYSE",
      "adr_ratio": 5,
      "adr_price_usd": 175.50,
      "tw_price_twd": 1050.0,
      "tw_equivalent_usd": 161.77,
      "premium_pct": 8.49,
      "premium_label": "ADR at 8.49% premium to TW shares",
      "error": null
    }
  ],
  "errors": []
}

Pricing

Flat $0.05 per run, regardless of how many tickers you track. Track all 6 ADRs or just 1 — same price.

Typical usage scenarios:

Use case	Runs/month	Monthly cost
Daily monitoring	30	$1.50
Hourly alerts (market hours)	150	$7.50
Research / backfill	5	$0.25

Prices shown are what you are charged. No hidden per-ticker or per-result fees.

Input

Field	Type	Default	Description
tickers	array	All 6	List of ADR symbols to track. Supported: TSM, UMC, CHT, ASX, HIMX, IMOS

Output Fields

Each run produces one dataset row:

Field	Type	Description
scraped_at	string	UTC timestamp of the fetch (ISO 8601)
fx_rate_usd_twd	number	USD/TWD exchange rate at time of fetch
tickers_requested	integer	Number of ADRs requested
tickers_computed	integer	Number of premiums successfully computed
results	array	Per-ticker results (see below)
errors	array	Tickers that failed with reason

Per-ticker result fields:

Field	Type	Description
adr_ticker	string	ADR symbol (e.g. TSM)
tw_ticker	string	TWSE symbol (e.g. 2330.TW)
company_name	string	Full company name
exchange	string	NYSE or NASDAQ
adr_ratio	integer	Number of TW shares per 1 ADR
adr_price_usd	number	Live ADR price in USD
tw_price_twd	number	Live TW share price in TWD
tw_equivalent_usd	number	USD cost of TW shares equivalent to 1 ADR
premium_pct	number	Premium (+) or discount (-) percentage
premium_label	string	Human-readable summary
error	string|null	Error reason if computation failed, null otherwise

Other Actors by This Developer

• Taiwan Gold Card Stats Tracker — Monthly Employment Gold Card issuance statistics from Taiwan's National Development Council.

FAQ

Why might a premium or discount exist? Cross-listed shares trade in different markets with different hours, liquidity, and investor bases. Foreign investor demand, market sentiment differences between NYSE and TWSE, and capital flow restrictions can all cause persistent premiums. The TSMC ADR premium is especially well-studied.

Are prices real-time? Prices are sourced from Yahoo Finance via yfinance. During market hours, prices are live or near-live. Outside market hours, the most recent closing prices are used. TWSE closes at 13:30 TST (UTC+8); NYSE closes at 16:00 EST (UTC-5).

What if a price is unavailable? If any price cannot be fetched (delisted ticker, network issue, Yahoo Finance outage), the affected ticker row will have a non-null error field. Other tickers in the same run are not affected. You are still charged the flat $0.05 for the run.

Which ADS ratios are used? Ratios are based on public SEC Form F-6 filings. Issuers can adjust ratios via tender offers — check the actor's CHANGELOG or the issuer's most recent 20-F if you suspect a ratio has changed.

Can I schedule this to run automatically? Yes — use Apify's built-in scheduler to run the actor on any cron schedule. For daily monitoring, set it to run once per day after both TWSE and NYSE have closed for clean closing-price comparisons.

Support

Open an issue on the actor's Issues tab for bugs or feature requests.