SK Hynix is increasing its investments in South Korea's bond market as its cash pile swells, with analysts and market participants estimating it bought 10 trillion won to 40 trillion won, or about $7 billion to $28 billion, of Korean debt this year. The upper end of that range includes commercial paper, and people familiar with the matter said the company has expanded purchases since April, typically placing 100 billion won to 300 billion won orders in AA-rated or higher investment-grade bonds with maturities of no more than three years. A recent SK Hynix job posting also pointed to broader fixed-income activity, describing responsibilities that include managing corporate funds, setting strategy and hedging across government bonds, corporate bonds and short-term debt instruments. The company's cash and cash equivalents reached 88 trillion won at the end of the second quarter, up nearly 62% from the previous quarter, highlighting how a chipmaker benefiting from the AI boom is taking a more visible role in a market usually dominated by institutional investors.