NVIDIA (NVDA) and Supply Chain Partners expand capacity to accelerate AI infrastructure buildout

• Substrate agreements with IBIDEN, Samsung Electro-Mechanics and Unimicron Technology Corporation will, in aggregate, drive a 2.5x increase in capacity over the next three years.
• Amkor plans to increase its advanced packaging capacity by more than 300% by the end of 2028.
• KYEC will build new facilities in the U.S., supported by a $1.1 billion capacity reservation advance from NVIDIA.
• SPIL is targeting to increase its optical-engine capacity for co-packaged optics by 15x by mid-2027, with aims for another doubling by the end of 2028.

Supply agreements of this kind, anchored by prepayments and capacity reservation advances rather than take-or-pay volume commitments alone, have been a recurring feature of this AI buildout cycle and historically signal that the binding constraint sits in packaging and substrates rather than in wafer fabrication itself. The pattern through past semiconductor upcycles is that the bottleneck migrates: leading-edge foundry capacity gets secured first, then advanced packaging, substrates, and test become the chokepoints, and each layer eventually attracts the same advance-funded expansion seen here with Amkor, KYEC, SPIL, and the substrate trio. The two-sided read is established: for the named suppliers, reserved capacity with customer-funded capex de-risks the investment and tends to re-rate the packaging and substrate peer set, while for NVDA the prepayment structure secures supply at the cost of balance-sheet commitment, a trade that has played well while demand outruns capacity and less well when the cycle turns and reserved capacity becomes an overhang. The co-packaged optics expansion at SPIL is the more forward-looking element, consistent with the interconnect, not compute, becoming the next constraint as clusters scale. What bears watching is whether lead times on advanced packaging actually compress as this capacity lands, since that is the tell for where the cycle sits, and whether comparable prepayment deals proliferate, which in past episodes has marked the later innings of a capacity race rather than the early ones.