Overview

Sumco is a manufacturer of electronic-grade silicon wafers for the semiconductor industry, headquartered in Phoenix, Arizona, United States. Its U.S. operations employ roughly 500 to 1,000 people, and its estimated revenue falls in the $1 billion to $5 billion range. The company serves the automotive, electric-vehicle, electronics, plumbing-hardware, and industrial-equipment sectors. In March 2026, it postponed construction of a planned new fab in Saga, Japan, to prioritize equipment upgrades at existing facilities, as reported by Nikkei.

At a glance

What Sumco makes

The company holds IATF 16949, ISO 9001, ISO 14001, ISO 45001, and ISO/TS 16949 certifications and lists semiconductor and electronics among its products.

Products and capabilities described on the company's own site include Semiconductor, Electronics (source: sumcousa.com).

Certifications

Sumco is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• IATF 16949 — sumcousa.com

• ISO 14001 — sumcousa.com

• ISO 45001 — sumcosi.com

• ISO 9001 — sumcousa.com

• ISO/TS 16949 — sumcousa.com

Trade and customs footprint

Sumco announced in March 2026 that it was delaying construction of a new Saga, Japan plant, with the Nikkei and Saga Shimbun reporting that the company would prioritize supply for AI-related demand and upgrade existing equipment. US customs bill-of-lading records list 968 inbound shipments across 24 foreign suppliers, with top origins including Japan · Singapore · Germany · South Korea.

Latest developments

• 2026-08-06 — Sumco (TYO:3436) Q2 2026 Earnings Call Transcript & Audio (stockanalysis.com)

• 2026-04-06 — [News] SUMCO Delays Construction of Two Silicon Wafer Fabs Amid Market Shift (trendforce.com)

• 2026-03-30 — Sumco shifts wafer strategy to equipment upgrades over new plant (digitimes.com)

• 2026-03-30 — SUMCO、佐賀・吉野ケ里新工場建設を当面延期　AI向け供給優先 - 日本経済新聞 (nikkei.com)

• 2026-03-28 — SUMCO　吉野ヶ里町の工場新設、一時延期　市況変化で既存設備強化を優先 | 行政・社会 | 佐賀県のニュース | 佐賀新聞 (saga-s.co.jp)

• 2026-03-27 — SUMCO: Announcement Regarding the Approval of Amendment to the “Plan for Ensuring Stable Supply” Based on the Economic Security Promotion Act (Tokyo:3436) | 6ix (6ix.com)

Company details

Sumco is privately held, and its estimated headcount and revenue bands are based on public estimates rather than audited figures. Sumco has an estimated 500-1,000 employees, and is headquartered in Phoenix, Arizona.

Frequently asked questions

What does Sumco make?

Sumco is a manufacturer of electronic-grade silicon wafers for the semiconductor industry, headquartered in Phoenix, Arizona, United States. Its U.S. operations employ roughly 500 to 1,000 people, and its estimated revenue falls in the $1 billion to $5 billion range. The company serves the automotive, electric-vehicle, electronics, plumbing-hardware, and industrial-equipment sectors. In March 2026, it postponed construction of a planned new fab in Saga, Japan, to prioritize equipment upgrades at existing facilities, as reported by Nikkei.

Where is Sumco headquartered?

Sumco is headquartered in Phoenix, Arizona (19801 N Tatum Blvd, Phoenix, Arizona, 85050-4201).

How big is Sumco?

Sumco has an estimated 500-1,000 employees, with revenue in the $1-5B range (estimated).

What certifications does Sumco hold?

Sumco lists IATF 16949 · ISO 14001 · ISO 45001 · ISO 9001 · ISO/TS 16949 on its website. Confirm the certified scope for the specific plant producing your part.

Does Sumco import from overseas suppliers?

US customs bill-of-lading records show 968 inbound shipments for Sumco, with top origins including Japan · Singapore · Germany · South Korea.

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Last verified Nov 2026. Is this your company? Request a correction.