This Week in the Chain — Jul 3, 2026

Top gainers

Largest market-cap moves since Jun 29, 2026 (338 priced companies moved ≥1%). Figures are live market caps; moves reflect price action plus any share-count updates.

1. 1SUMCO$8.3B → $11.1B+33.4%
2. 2Ambarella$2.8B → $3.4B+22.9%
3. 3MPI Corporation$18.6B → $22.7B+21.6%
4. 4indie Semiconductor$750M → $910M+21.3%
5. 5Kokusai Electric$14.4B → $17.4B+20.9%
6. 6Asia Vital Components Co., Ltd.$28.4B → $34.0B+19.8%
7. 7Accton Technology Corporation$41.1B → $47.9B+16.7%
8. 8Alchip Technologies$10.3B → $12.0B+16.5%

Source: wafergraph live market caps (Yahoo Finance × SEC shares). As of 2026-07-03.

Top decliners

1. 1MK Electron$320M → $230M-28.1%
2. 2Aehr Test Systems$2.9B → $2.2B-24.7%
3. 3Arteris$2.1B → $1.6B-24.3%
4. 4Foosung$1.3B → $1.0B-22.3%
5. 5Vicor$16.2B → $12.9B-20.4%
6. 6Teradyne$72.3B → $57.8B-20.1%
7. 7Cipher Mining$10.2B → $8.2B-19.5%
8. 8GigaDevice Semiconductor$86.9B → $70.3B-19.1%

Source: wafergraph live market caps. As of 2026-07-03.

Coverage changes

How the dataset's coverage shifted versus the last snapshot.

Source: wafergraph dataset. As of 2026-07-03.

Why it matters

SUMCO sits in Materials — Materials are the physical feedstocks — silicon wafers, photoresists, specialty gases, substrates, and chemicals — that every fabrication process consumes. Without ultra-pure materials meeting atomic-level tolerances, even the most advanced equipment cannot produce working chips. The segment is characterized by highly concentrated supply: Japan holds dominant positions in silicon wafers (Shin-Etsu leads; Sumco is a major supplier), photoresists (JSR, TOK, Shin-Etsu), and photomask blanks (HOYA), while the US and Germany hold key positions in specialty gases and CMP consumables.. Watch this segment for second-order supply-chain effects.

Segment context from the wafergraph taxonomy.