Amkor breaks ground in Korea as Nvidia and other customers pay over $3 billion to reserve capacity

Amkor▼−4.28% — Amkor, down 4.28 percent today, the outsourced chip packaging and test house, broke ground on October 29 on a new building at its Gwangju campus in South Korea, and the output is already spoken for ¹². The building sits inside a $1.3 billion agreement with Nvidia↗, the AI chip designer, part of multi-year commitments that now pass $3 billion across Korea and Arizona ¹².

Nvidia▼−3.21% — Nvidia, down 3.21 percent today prepays under those deals, and since 2025 a dozen other customers have also paid in advance to hold assembly space ²³. Demand at this company is settled in cash. The open risk is delivery, and this past week's sellers were largely aiming at the wrong one.

Packaging is where AI compute becomes physical

An AI accelerator is not one chip. It is compute silicon and stacked memory wired together by advanced packaging: wafer bumping, 2.5D through-silicon vias and high-density fan-out, the processes Amkor runs at Gwangju and at its Songdo research campus ¹². Nvidia designs the accelerators and builds none of this; it reserves the lines and pays cash to hold them. The Nvidia executive at the groundbreaking runs co-packaged optics manufacturing, the emerging step of fusing optical links into the package itself ¹.

That is how a factory can be fully booked before it exists.

Communications shrank on purpose while the AI lines grew

Third-quarter revenue was $1.99 billion↗, barely above a year earlier, and the market read the stall as a rupture in the AI packaging story ³⁴. The stall came from mix: communications, mostly smartphone system-in-package work, fell 28% as Amkor moved it from Korea to Vietnam to free cleanroom for higher-value packaging ⁵. Computing and automotive and industrial each grew 37% ⁵. Net income rose by half to $191 million ⁴. Gross margin reached 18.3%, four points above a year earlier ⁴⁵.

The customer funds the build, and the customer just changed chief executives

This year's capital spending is set near $2.5 billion while the top line has stopped growing, and free cash flow is negative ⁴⁶. Quarter by quarter, plant spending has climbed past half a billion dollars ⁷.

Insiders sold nearly $1 billion of Amkor stock over the past year and bought none ⁶. The shares were cut about 57% from May to early November ³. They jumped a tenth on November 11, then gave the move back across the two sessions after Nvidia founder Jensen Huang resigned and finance chief Colette Kress was named interim chief executive ³⁸⁹¹⁰. Nvidia's board says it expects customer commitments and the product roadmap to continue without interruption↗, and that assurance is now load-bearing for Amkor's capacity book ¹⁰.

Demand is booked; delivery is the open risk

Nothing in the record shows the AI packaging story broken. What is unproven is execution: holding that margin while a third of revenue shrinks on purpose, ramping Vietnam, and finishing a building whose size, cost and completion date Amkor has not disclosed↗ ²⁵. The market spent the week watching the quarter. The money is in the book, and the builder that turns reserved concrete into delivered compute is doing the work AI still needs. That work is Amkor's to lose.