How is the S&P GSCI commodity index constructed?

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AcadiFi · Accepted Answer

The S&P Goldman Sachs Commodity Index (GSCI) is a world-production-weighted index covering 24 commodities across energy, metals, agriculture, and livestock...

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Composition as of recent years: energy accounts for roughly 58-62% (crude oil alone about 25%), agriculture 15-18%, industrial metals 10-12%, precious metals 5-7%, and livestock 5-7%. This heavy energy tilt makes the GSCI behave more like an oil proxy than a diversified commodity basket.

Construction steps: (1) select eligible contracts meeting liquidity thresholds at major exchanges; (2) compute five-year average world production values in USD; (3) assign target weights; (4) determine contract roll schedules using the defined rolling calendar (GSCI rolls on the 5th-9th business days of each month, moving from the expiring month to the next designated contract).

```mermaid
flowchart TD
  A[Global Production Data] --> B[5-Year Avg Value]
  B --> C[Target Weights]
  C --> D[Roll Schedule]
  D --> E[GSCI Index Level]
```

Return components: the GSCI Total Return index combines spot return (price change of front-month contracts), roll return (gain/loss from rolling), and collateral return (T-bill yield on notional). For risk managers at Harmony Pension Advisors, understanding that 60%+ of the GSCI is energy means a pension board allocating 5% to 'commodities' via GSCI is really taking concentrated oil exposure. Many institutions prefer more balanced indices like the Bloomberg Commodity Index (BCOM) which caps any single commodity at 15% and any sector at 33%, providing better diversification. Always inspect the weighting methodology before committing capital.

How is the S&P GSCI commodity index constructed?

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