Market concentration of mega-cap companies
How much of the whole market's market capitalization is concentrated in the top few companies?
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Sample JSON
Specification JSON
Sample as of
0700.HK Tencent Holdings | Hang Seng Index | 2025-10-16 – 2026-10-16 | HKD
- Latest value
- 100 %
- Period average
- 100 %
- Period high
- 100 %
- Period low
- 100 %
Market capitalization concentration
Market capitalization share of the largest companies (%) (Stacked bar)
Top ten companies
Market capitalization HHI (0–10,000) (Line)
Security de-duplication and missing values
Market capitalization share of the largest companies (%) and Market capitalization HHI (0–10,000) (Table)
Sample data rows
| Concentration tier | Market capitalization share of the largest companies (%) | Market capitalization HHI (0–10,000) | Data date (sample) |
|---|---|---|---|
| 2025-10 | 100 | 4260 | 2025-10-31 |
| 2025-11 | 100 | 3512 | 2025-11-28 |
| 2025-12 | 100 | 2150 | 2025-12-31 |
| 2026-01 | 100 | 2587 | 2026-01-30 |
| 2026-02 | 100 | 3903 | 2026-02-27 |
| 2026-03 | 100 | 3159 | 2026-03-31 |
| 2026-04 | 100 | 2645 | 2026-04-30 |
| 2026-05 | 100 | 4476 | 2026-05-29 |
| 2026-06 | 100 | 3002 | 2026-06-30 |
| 2026-07 | 100 | 1334 | 2026-07-31 |
| 2026-08 | 100 | 2423 | 2026-08-31 |
| 2026-09 | 100 | 1639 | 2026-09-30 |
| 2026-10 | 100 | 2131 | 2026-10-16 |