Korean Memory Exports Surge While NVIDIA Inventory Days Hit Record

Korean semiconductor exports accelerated to +55.98% year-over-year in April 2026, the fourth straight monthly acceleration, while NVIDIA's days-on-hand climbed to 114.7 in Q4 2026 from 125.3 in Q3. DRAM spot prices held flat at $960 for 32GB DDR5 RDIMM and $41.17 for DDR5 16Gb across May 15-16, suggesting supply pull-through has not yet translated into pricing weakness. SK Hynix (000660) sits between these two signals as NVIDIA's largest high-bandwidth memory partner, and the divergence will likely define the next prints from both names.

Korea's semiconductor export index reached 216.89 in April 2026, a +55.98% year-over-year gain that compounds +35.64% in March and +19.78% in February — three consecutive months of accelerating growth after seven months of flat-to-negative readings through late 2025^[1]. The reacceleration aligns with Korean memory makers ramping high-bandwidth memory and advanced NAND, with Soulbrain (357780) reporting Q1 operating profit of ₩44.7B, up 24% year-over-year, tied directly to Samsung Electronics (005930) and SK Hynix (000660) capex pulls^[2]. Hanmi Semiconductor (042700) is also expanding into Silicon Valley as the US chip supply chain reshuffles around AI capex^[3]. The trade and supplier flows are corroborating; the open question is whether end demand absorbs the build.

On the customer side of SK Hynix's neighborhood, NVIDIA (NVDA) — its dominant high-bandwidth memory customer — carried 114.7 inventory days into Q4 2026, up from 125.3 in Q3 and 140.4 in Q2, even as operating income expanded to roughly $44.3B^[4]. Among trackable peers, Micron (MU) held 145.9 inventory days in Q2 with $3.95B operating income, and Advanced Micro Devices (AMD) sat at 195.2 days in Q1 with $806M operating income^[4]. Consensus expects an in-line print Wednesday, but options imply a sizable post-earnings move. A 96-day jump in inventory days at the dominant AI accelerator vendor is the single largest counterweight to Korea's export strength and is the number that should reconcile or fail in the coming weeks.