SKHY Premium Data Methodology: Sources, Refresh Timing and Data Rules
Data sources
| Data point | Source | Refreshed |
|---|---|---|
| SKHY ADR price | Nasdaq | US trading hours |
| 000660 share price | Korea Exchange (KRX) | Korean trading hours |
| USD/KRW exchange rate | FX data feed | While a market is open |
| 10 ADS = 1 share ratio | SEC prospectus | Static |
Refresh timing and missing data
The configured external scheduler (cron) calls the quote refresh endpoint once per minute while markets are active, and each successful refresh stores a new snapshot. Concretely, SKHY updates during Nasdaq's regular session (9:30–16:00 US Eastern), 000660 during KRX trading hours (09:00–15:30 Korea time), and the exchange rate whenever at least one market is open.
Nasdaq and KRX generally do not overlap, and each data source only updates during its own market window, so a closed-market value is retained with its original quote time rather than refreshed as a new observation. Each displayed result therefore compares the shown observations, which may have different timestamps. If SKHY, 000660, or USD/KRW is missing or invalid, the result is shown as unavailable rather than estimated.
Precision and freshness
Calculations use unrounded positive numeric inputs; rounding is for display. Source availability and delay can change, so the site uses “Latest” unless the displayed source and session support a stronger label.
Official ratio source
The final SEC prospectus confirms SKHY, 000660, and the ADS ratio. Review the SK Hynix ADR guide, US access guide, or return to the SKHY premium calculator.