{
  "id": "feafdd00-d900-5b60-8615-cf33ccb1a25f",
  "slug": "bcom-bloomberg-commodity-index",
  "term": "BCOM (Bloomberg Commodity Index)",
  "aliases": [],
  "category": "Commodities",
  "category_slug": "commodities",
  "difficulty": "intermediate",
  "definition": "The Bloomberg Commodity Index (BCOM) is a broadly diversified commodity index that measures the performance of futures contracts on physical commodities, subject to maximum and minimum commodity and commodity group weightings designed to avoid excessive concentration in any single sector, making it more balanced than production-weighted alternatives.",
  "key_takeaways": [
    "BCOM weights commodities using a blend of liquidity (trading volume) and production data, subject to diversification rules: no single commodity can exceed 15% and no single commodity group can exceed 33% of the index.",
    "The index covers five commodity sectors: energy, grains, industrial metals, precious metals, and softs/livestock — providing broader diversification than energy-heavy alternatives like the S&P GSCI.",
    "BCOM is fully collateralized: index returns assume the full notional of invested capital earns the T-bill rate (collateral return) while futures returns include spot return and roll return.",
    "The roll methodology — rolling futures contracts from front month to the next — creates meaningful drag in contangoed markets and a tailwind in backwardated markets.",
    "BCOM has historically exhibited lower volatility and lower drawdown than the S&P GSCI due to its reduced energy concentration (~30% vs. ~60% in GSCI)."
  ],
  "detailed_explanation": "The Bloomberg Commodity Index was originally developed by Dow Jones as the Dow Jones-AIG Commodity Index in 1998, rebranded as the DJ-UBS Commodity Index following AIG's involvement, and renamed BCOM following Bloomberg's acquisition of the index business in 2014. It is one of the two most widely tracked commodity benchmarks globally — alongside the S&P GSCI — and serves as the basis for numerous ETFs, swap contracts, and structured products.\n\nThe index's construction philosophy prioritizes diversification. While the S&P GSCI weights commodities almost entirely on world production, BCOM blends production data (one-third) with liquidity data (two-thirds), then applies caps: no single commodity exceeds 15% and no sector exceeds 33% of the total index. These rules prevent oil from overwhelming the index — a crucial difference from the GSCI, where crude oil and refined products frequently account for 60%+ of total weight. BCOM's energy exposure typically runs 25–35%, with the balance split relatively evenly among metals, agricultural commodities, and softs.\n\nAs a futures-based index, BCOM's total return has three components: (1) Spot return — changes in the near-term futures price, approximating changes in the underlying spot commodity price; (2) Roll return — profit or loss from rolling expiring contracts into the next contract, positive in backwardation and negative in contango; and (3) Collateral return — the return on T-bills or money market instruments posted as margin on the futures positions. During the 2000s commodity supercycle, all three components were positive simultaneously — a rare and unrepeatable configuration. From 2012 to 2020, persistent contango in energy and agricultural markets generated severe roll drag, causing BCOM to meaningfully underperform spot commodity prices.\n\nFor institutional investors, BCOM serves primarily as an inflation hedge and portfolio diversifier. The historical correlation between BCOM and the S&P 500 is approximately 0.1–0.2, making it a meaningful diversifier in multi-asset portfolios. The correlation with CPI inflation is positive and often leads, particularly during commodity supply shocks. However, practitioners note that the hedging effectiveness deteriorates when commodity markets shift from backwardation to contango — as occurred in the 2010s — and that long-only commodity index exposure has not consistently delivered risk-adjusted returns commensurate with equity markets.",
  "example": "In 2022, following the Russian invasion of Ukraine, BCOM delivered a total return of approximately +16% — driven by explosive gains in energy (+45%), grains (+20%), and metals (+10%). The index's diversified construction meant it captured the full breadth of the commodity supply shock, whereas a pure energy index would have been more concentrated but less resilient to any correction in oil prices. An institutional investor holding 5% of a $1 billion portfolio in BCOM received approximately $8 million in excess return versus a 60/40 equity/bond portfolio that lost roughly 15% — demonstrating the index's role as an inflation hedge in a year when traditional diversification benefits of bonds completely failed.",
  "formula": "BCOM Total Return = Spot Return + Roll Return + Collateral Return\nRoll Return = (F_new - F_old) / F_old, where rolling from near contract to deferred contract",
  "formula_latex": null,
  "interactive_type": "chart",
  "calculator_id": null,
  "related_terms": [
    "agricultural-commodities",
    "backwardation",
    "basis",
    "bond",
    "breadth",
    "commodity-index",
    "contango",
    "correlation",
    "diversification",
    "equity",
    "futures-curve",
    "futures-price",
    "gsci-goldman-sachs-commodity-index",
    "hedging",
    "henry-hub"
  ],
  "backlinks": [
    "brent-crude-oil",
    "commodity-index",
    "contract-grade",
    "futures-curve",
    "gsci-goldman-sachs-commodity-index",
    "metal-commodities",
    "seasonal-pattern",
    "spot-price",
    "storage-cost"
  ],
  "cross_references": [
    "agricultural-commodities",
    "backwardation",
    "basis",
    "bond",
    "breadth",
    "commodity-index",
    "contango",
    "correlation",
    "diversification",
    "equity",
    "futures-price",
    "hedging",
    "inflation",
    "liquidity",
    "margin",
    "swap"
  ],
  "tags": [
    "level:intermediate",
    "cat:commodities"
  ],
  "asset_classes": [
    "commodities"
  ],
  "regulators": [],
  "see_also": [],
  "sources": [],
  "wordcount": 669,
  "checksum": "49ad7dc3d68d9750",
  "version": "2026.05.03",
  "license": "CC-BY-4.0",
  "updated_at": "2026-09-07T02:15:24+00:00",
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    "category": "https://hedgefund.wiki/api/v1/categories/commodities",
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}