This Week in the Chain — Jul 22, 2026

Top gainers

Largest market-cap moves since Jul 20, 2026 (360 priced companies moved ≥1%). Figures are live market caps; moves reflect price action plus any share-count updates.

1. 1Aehr Test Systems$2.5B → $3.2B+27.9%
2. 2Piotech$27.4B → $34.0B+24.1%
3. 3Actions Technology$910M → $1.1B+22.0%
4. 4Unimicron$36.6B → $44.1B+20.6%
5. 5Nebius Group$45.8B → $55.1B+20.2%
6. 6ASPEED Technology$16.6B → $19.9B+19.8%
7. 7Hwatsing Technology$16.7B → $20.0B+19.7%
8. 8Tongfu Microelectronics$14.2B → $16.8B+18.8%

Source: wafergraph live market caps (Yahoo Finance × SEC shares). As of 2026-07-22.

Top decliners

1. 1Win Semiconductors$4.1B → $900M-78.2%
2. 2Vicor$10.7B → $9.8B-8.8%
3. 3PSK Inc$3.3B → $3.1B-8.1%
4. 4Hansol Chemical$1.9B → $1.7B-8.1%
5. 5Tencent$548.5B → $505.9B-7.8%
6. 6Eugene Technology$1.9B → $1.8B-7.2%
7. 7Weebit Nano$910M → $860M-5.5%
8. 8Wafer Works$2.5B → $2.4B-4.4%

Source: wafergraph live market caps. As of 2026-07-22.

Coverage changes

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

Source: wafergraph dataset. As of 2026-07-22.

Why it matters

Win Semiconductors sits in Foundry — Pure-play foundries manufacture chips designed by others, enabling the fabless model. TSMC is the world's leading logic foundry — it manufactures the most advanced nodes and produces chips for most of the largest fabless companies, making it arguably the single most strategically important company in the supply chain. Samsung also offers foundry services and is a key alternative for leading-edge logic. Specialized foundries such as Win Semiconductors (GaAs RF), GlobalFoundries, UMC, and SMIC serve the much larger market for mainstream and specialty nodes. Watch this segment for second-order supply-chain effects.

Segment context from the wafergraph taxonomy.