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Commodity ETFs and ETNs

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Commodity ETFs and ETNs

Commodity ETFs and Exchange-Traded Notes (ETNs) are the primary vehicles for retail investors seeking commodity exposure without futures trading, physical storage, or mining equities. The distinction between ETFs and ETNs is critical: ETFs are funds (they own underlying assets); ETNs are debt instruments (they're promises from the issuer to pay you the commodity return). This difference creates structurally different risks.

GLD (SPDR Gold Shares) is the gold standard. GLD holds physical gold bars in vaults (allocated, audited, insured). It tracks the gold spot price closely with minimal tracking error. Expense ratio is 0.40 percent annually. GLD is an ETF, so it owns the gold; if the issuer goes bankrupt, your gold is safe. For buy-and-hold gold exposure, GLD is the default choice.

SLV (iShares Silver Trust) mirrors GLD but for silver. It holds physical silver; expense ratio is 0.50 percent. Silver's lower price per ounce means storage costs are smaller in percentage terms, so SLV tracks spot silver efficiently. Like GLD, SLV is an ETF with physical backing.

USO (United States Oil Fund) is more complex. USO holds WTI crude oil futures contracts, rolling continuously. This exposes USO to roll yield drag in contango environments. Historically, USO has significantly underperformed spot oil prices due to negative roll yield. An investor who bought USO at $40 in 2009 would have seen spot crude oil triple by 2011, but USO only doubled due to roll losses. Expense ratio is 0.45 percent, but roll drag often costs 2–4 percent annually.

UNG (iPath Series B Bloomberg Natural Gas ETN) is an ETN, not an ETF. This matters enormously. UNG doesn't own natural gas; it's a debt instrument issued by Barclays promising to pay the natural gas return. If Barclays fails, you have an unsecured claim on a bankruptcy estate—not a direct claim on natural gas. UNG also holds front-month natural gas futures, rolling constantly. In steep contango (like 2020–2021), UNG lost 50+ percent despite spot natural gas rallying. UNG is a cautionary tale about ETN counterparty risk combined with relentless roll drag.

Diversified commodity indices:

  • DBC (Commodities ETF) holds a basket of commodity futures (energy, metals, agriculture) weighted by market cap. It holds both index futures and individual commodity futures. Expense ratio is 0.85 percent. DBC exhibits significant roll drag because multiple commodities are in contango simultaneously.
  • DJP (iShares Commodities Select ETF) uses a different indexing approach, attempting to minimize roll drag. Still subject to contango losses but somewhat more efficient than DBC.
  • DBA (iShares Agriculture ETF) focuses on agricultural commodities. Grain and soft commodity futures often exhibit seasonal patterns that create periodic positive roll yields.

Tax treatment varies. Physical ETFs (GLD, SLV) are treated as collectibles for capital gains tax—long-term gains are taxed at 28 percent (higher than typical 15–20 percent stock gains). Futures-based ETFs may benefit from "60/40" tax treatment (60 percent taxed as long-term, 40 percent as short-term, regardless of holding period), creating tax efficiencies if the underlying futures are reported on Form 1256. This is a technical point but can save 5–10 percent in taxes over time.

Counterparty risk is the fundamental ETF vs. ETN distinction. GLD and SLV hold physical assets; counterparty risk is minimal (you own the gold/silver). DBC and DJP hold futures contracts cleared through the CME; counterparty risk is eliminated by the clearing house. UNG is an ETN; it's a debt instrument, so you're exposed to Barclays' credit risk. During the 2008 financial crisis, ETN investors faced the terrifying reality that their "commodity" exposure was actually a bet on an issuer's solvency.

For most investors, GLD for gold and SLV for silver are optimal. For crude oil exposure, USO is available but requires accepting roll drag; alternatives include buying crude oil futures directly or owning oil company stocks. For diversified commodity exposure, DBC or DJP are acceptable but recognize that roll drag will suppress returns in contango environments. Avoid UNG unless you're an active trader timing the natural gas curve.

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