TSMC expands outsourced AI chip packaging as demand nears full capacity

TSMC Taiwan Semiconductor Manufacturing Company Limited ↗ 0.44% is ramping up outsourcing of its advanced CoWoS packaging process to outside partners as surging demand from AI chip makers like Nvidia ↗ 2.27% and AMD Advanced Micro Devices, Inc. ↘ 1.21% pushes its internal capacity to near-full utilization. The news sent TSMC's U.S.-listed shares up nearly 3% in pre-market trading on Tuesday.tradingkey

The Taiwanese chipmaker is expanding cooperation with outsourced semiconductor assembly and test providers including ASE Technology Holding ↗ 0.38% and SPIL to increase overall advanced packaging supply, according to market sources cited by multiple outlets. CoWoS, which efficiently integrates GPUs with High Bandwidth Memory stacks, has become one of the critical bottlenecks limiting AI chip shipments as demand grows for Nvidia's Blackwell series and the future Rubin platform.digitimes+1

Outsourcing Strategy Takes Shape

TSMC has been steadily transferring advanced packaging orders to OSAT providers rather than risk losing customers to competitors, according to Digitimes. ASE has emerged as the largest beneficiary of this outsourcing wave, with the company's management expecting advanced packaging and testing revenue to grow by more than $1 billion in 2026. ASE and SPIL have committed more than NT$11.173 billion in recent months to expand capacity and equipment in preparation for incoming orders.smbom+2

Industry analysts have noted that the primary growth driver in 2026 is on-substrate outsourcing from TSMC for Nvidia GPUs. CoWoS advanced packaging now represents 17–23% of AI accelerator manufacturing costs, underscoring its growing economic importance in the semiconductor supply chain.eetasia+1

EMIB-Like Technology in Development

Separately, TSMC is developing a new advanced packaging technology modeled on Intel's ↗ 1.84% Embedded Multi-die Interconnect Bridge, internally dubbed "EMIB-like" or "quasi-EMIB," according to a report by The Information first cited by Seeking Alpha and Digitimes. The effort signals that competition in AI semiconductor packaging is expanding from front-end process nodes to back-end packaging.longbridge+2

The move would broaden TSMC's packaging lineup beyond CoWoS and address Intel's growing competitiveness in this space. Intel has reportedly secured packaging deals by pitching EMIB as a way to ease CoWoS bottlenecks for fabless chip designers seeking a second source.semiwiki

Margins and Outlook

For TSMC, while tight CoWoS capacity creates short-term supply pressure, advanced packaging offers higher profit margins than traditional wafer foundry services. As AI chip demand continues to expand, the packaging segment is expected to become an increasingly important revenue driver, with capacity scaling remaining a key factor investors are watching closely.tradingkey