Hardware / Compute

AMKR

Amkor Technology

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In Your Sleeves

Speculative Individual Stocks
6.5%
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Why I Own It

Advanced packaging has become the critical bottleneck in AI chip production — not lithography or chip design, but the physical integration of chiplets into a finished, functioning package. Amkor is the only large independent advanced packaging house with meaningful CoWoS and fan-out capacity outside of TSMC's own lines. When TSMC's in-house packaging is fully allocated to its own customers, AI chip designers have to turn to Amkor. I sized the position to reflect real exposure to this structural supply constraint while acknowledging Amkor's capital intensity and customer concentration in the Apple and TSMC supply chains.

Why This Sleeve

AMKR is in the taxable retail portfolio because packaging stocks carry significant earnings volatility from utilization rate swings and customer mix changes. Active management through those cycles — adding during trough utilization, trimming at peak — is better suited to a taxable account than the long-duration, low-touch orientation of the Roth IRA.

Investment Thesis

Amkor Technology is the largest US-headquartered outsourced semiconductor assembly and test (OSAT) company, providing the advanced packaging that converts bare chiplets and wafers into finished, functional devices. The AI infrastructure buildout has elevated packaging — specifically advanced formats like CoWoS (Chip-on-Wafer-on-Substrate) and SoIC (System on Integrated Chips) — from a commodity service to a critical supply chain bottleneck. Every NVIDIA GPU, every AMD accelerator, and every custom ASIC requires advanced packaging, and TSMC's own in-house capacity cannot meet the full demand from its AI-focused customers.

Amkor's position in the TSMC supply chain — as the primary independent CoWoS packaging partner — makes it a direct beneficiary of constrained in-house capacity at the foundry. As AI chip volumes scale through 2025-2026, the share of packaging outsourced to Amkor rather than handled in-house by TSMC grows. Meanwhile, the consumer electronics packaging recovery in Vietnam and Malaysia provides a margin-improvement tailwind on the legacy business. The combination of advanced packaging mix growth and mainstream utilization recovery should drive EBITDA margin expansion over the next two years.

Scenario Analysis

Bull Case

Advanced Packaging Capacity Shortage

AI chipmaker demand dramatically exceeds advanced packaging supply, giving Amkor exceptional pricing power and utilization.

  • CoWoS and SoIC capacity remains constrained through 2026 as AI chip volumes ramp

  • Apple, NVIDIA, and AMD advanced packaging orders sustain high utilization

  • Amkor captures incremental CoWoS volume displaced from TSMC's constrained in-house lines

Base Case

AI Packaging Mix Improves Gradually

Advanced packaging wins in the TSMC supply chain ramp gradually, improving revenue mix and margins.

  • Advanced packaging grows from ~25% to 35%+ of total revenue over two years

  • Vietnam and Malaysia facility utilization improves as consumer electronics recovery proceeds

  • EBITDA margins expand 100-150 bps as advanced mix grows

Bear Case

TSMC Insources Advanced Packaging

TSMC expands its own advanced packaging capacity aggressively, reducing the outsourced market opportunity.

  • TSMC CoWoS-S and CoWoS-L expansion reduces reliance on outside packaging partners

  • Consumer electronics packaging cycle remains in a trough, depressing mainstream revenue

  • Customer pricing pressure intensifies as chiplet packaging becomes more commoditized

Key Risks

  1. 01

    TSMC vertical integration into advanced packaging is the primary structural risk to Amkor's TAM.

  2. 02

    Capital intensity — advanced packaging requires significant ongoing capex that constrains free cash flow.

  3. 03

    Customer concentration with Apple and TSMC supply chain participants.

  4. 04

    Technology transition risk if new packaging architectures (e.g., 2.5D alternatives) bypass current Amkor capabilities.

What I'm Watching

  • TSMC CoWoS capacity expansion announcements — the more TSMC insources, the less flows to Amkor.

  • Advanced packaging revenue as a percentage of total Amkor revenue each quarter.

  • New AI customer wins beyond the existing TSMC supply chain.

  • Vietnam and Malaysia utilization rates as a proxy for consumer electronics recovery.

  • Any NVIDIA or AMD packaging supply chain commentary in earnings calls.