South Korean foreign exchange authorities purchased approximately $20 billion from SK Hynix Inc.
The chipmaker repatriated these funds following its record $26.5 billion American Depositary Receipt (ADR) listing in the U.S. this July.
The Foreign Exchange Stabilization Fund, managed by the finance ministry and the Bank of Korea, executed the purchase.
Authorities used over-the-counter transactions to absorb the massive dollar inflow.
The intervention aimed to prevent excessive won volatility and replenish national foreign exchange reserves.