Korea market data · updated with each research note
SKHY Premium Tracker: SK hynix ADR vs Seoul Shares
How far the SK hynix American depositary shares (Nasdaq: SKHY) trade above or below the value of the underlying Seoul shares (KRX: 000660), every trading day since the ADR listed on July 10, 2026. One SKHY ADS represents 0.1 of an SK hynix common share, so ten ADSs equal one Seoul share.
SKHY premium, Oct 23, 2026
SKHY closed at $137.02. The Seoul close of KRW 1,263,000 at KRW 1,326.0 per USD is worth $95.25 per ADS, so investors paid a premium of 43.9% for the US line.
Premium since listing
Daily SKHY premium (above zero) or discount (below zero) to the dollar value of the same SK hynix shares in Seoul.
Last 15 trading days
| Date | SKHY close | Seoul close | KRW per USD | Seoul value per ADS | Premium |
|---|---|---|---|---|---|
| Oct 23, 2026 | $137.02 | KRW 1,263,000 | 1,326.0 | $95.25 | +43.9% |
| Oct 22, 2026 | $131.69 | KRW 1,234,000 | 1,325.6 | $93.09 | +41.5% |
| Oct 21, 2026 | $143.25 | KRW 1,288,000 | 1,323.9 | $97.29 | +47.2% |
| Oct 20, 2026 | $139.79 | KRW 1,190,000 | 1,330.0 | $89.47 | +56.2% |
| Oct 19, 2026 | $142.87 | KRW 1,304,000 | 1,333.4 | $97.79 | +46.1% |
| Oct 16, 2026 | $136.49 | KRW 1,265,000 | 1,340.9 | $94.34 | +44.7% |
| Oct 15, 2026 | $146.11 | KRW 1,238,000 | 1,339.3 | $92.43 | +58.1% |
| Oct 14, 2026 | $147.55 | KRW 1,425,000 | 1,340.3 | $106.32 | +38.8% |
| Oct 13, 2026 | $157.06 | KRW 1,456,000 | 1,334.1 | $109.13 | +43.9% |
| Oct 12, 2026 | $162.23 | KRW 1,605,000 | 1,340.8 | $119.70 | +35.5% |
| Oct 8, 2026 | $170.50 | KRW 1,686,000 | 1,339.1 | $125.91 | +35.4% |
| Oct 7, 2026 | $178.25 | KRW 1,715,000 | 1,339.7 | $128.01 | +39.2% |
| Oct 6, 2026 | $182.56 | KRW 1,784,000 | 1,343.8 | $132.76 | +37.5% |
| Oct 2, 2026 | $195.13 | KRW 1,842,000 | 1,360.6 | $135.38 | +44.1% |
| Oct 1, 2026 | $193.50 | KRW 1,828,000 | 1,356.8 | $134.72 | +43.6% |
Why SKHY trades at a premium
An ADR premium usually closes because brokers can buy shares in Seoul, deposit them with the depositary bank and sell new ADSs in New York. For SKHY that route is limited: under the deposit agreement, new shares can be deposited into the ADR program only with the company’s consent and within limits it sets, so the supply of ADSs cannot easily expand to meet US demand. Many US investors also cannot buy shares on the Korea Exchange directly, which keeps demand on the US line. The depositary is Citibank; the terms are in the prospectus filed with the SEC (SEC filing).
For other ways to own SK hynix from abroad, see buying Korean stocks by broker, Korean stocks you can buy in the US and EWY vs FLKR, the main US-listed Korea ETFs.
About this data
- Formula. Premium = SKHY close ÷ (Seoul close × 0.1 ÷ KRW per USD) − 1, using the same calendar date for all three numbers.
- Timing. Seoul closes at 15:30 KST, about 13 hours before New York, so part of any daily gap is news that arrived in between. Days when only one market was open are left out.
- Sources. Seoul closes from the Korea Exchange (KRX); SKHY closes and the won-dollar rate from Yahoo Finance. Prices exclude dividends. The page is refreshed when new research is published on this site.
Market data for information only. It is not investment advice.