6.5 Structured Investments, Commodity Funds & Sukuk

Key Takeaways

  • A structured investment combines a zero-coupon bond or deposit with an embedded derivative, so the investor's return profile is engineered but the capital sits as an unsecured claim on the issuing bank.
  • Capital-protected notes protect principal only against market falls, never against issuer default, and the protection typically applies solely at maturity.
  • A futures-based commodity fund earns a positive roll yield in backwardation and suffers a negative roll yield in contango, which is why long-run returns can diverge sharply from the spot commodity price.
  • Sukuk are Shariah-compliant certificates conferring undivided beneficial ownership of a tangible asset or its usufruct, generating rental or profit-share returns rather than prohibited interest (riba).
  • Asset-backed sukuk give holders genuine recourse to the underlying asset, whereas asset-based sukuk leave holders relying on the originator's purchase undertaking and therefore ranking as unsecured creditors.
Last updated: September 2026

6.5 Structured Investments, Commodity Funds & Sukuk

Element 4 of the syllabus does not stop at investment funds. It requires the characteristics and uses of structured investments, hedge funds, private equity, commodity funds and sukuk. Hedge funds and private equity are covered earlier in this guide; this section completes the set with the three vehicles that most often confuse candidates because their payoff is manufactured rather than inherited from an underlying market.


Structured Investments

A structured investment is a pre-packaged product whose return is engineered by combining a debt instrument with one or more derivatives. It is not an asset class; it is a wrapper that reshapes an existing exposure.

How the engineering works

The classic capital-protected note is built from two components. Take a five-year, £100 note with a bank funding rate of 5%:

  1. The zero-coupon leg. The issuer sets aside enough to repay £100 in five years: $£100 / (1.05)^5 = £78.35$.
  2. The option leg. The remaining £21.65, less the issuer's margin and distribution costs, buys call options on the reference index.

The size of that residual determines the participation rate — the share of index upside the investor receives. Because the residual depends on interest rates, a low-rate environment leaves less to spend on options, which is why capital-protected notes offered poor terms during the zero-rate era and improved sharply once rates normalised.

The main structures

StructurePayoffInvestor is really…
Capital-protected / growth note100% of capital returned at maturity plus a participation in index upsideLong a zero-coupon bond and long a call
Reverse convertibleHigh fixed coupon; capital repaid in full unless the underlying breaches a barrier, in which case shares are deliveredShort a put — selling insurance for a premium
AutocallablePays a coupon and redeems early if the underlying is above a trigger on an observation date; otherwise rolls on, with capital at risk below a final barrierShort a barrier put with a knock-out feature
Participation / tracker noteGeared or capped exposure to an index without dividendsLong a call spread, having given up the dividend stream

The risks a suitability report must name

  • Issuer credit risk. This is the dominant risk and the one most often overlooked. "Capital protection" is a promise by a bank, not a ring-fenced asset. Lehman Brothers' 2008 failure left holders of "100% capital protected" notes as unsecured creditors.
  • Protection applies only at maturity. Selling early exposes the investor to the mark-to-market value of both legs.
  • Liquidity. The secondary market is usually the issuer alone, quoting a wide spread.
  • Opacity of cost. Fees are embedded in the pricing of the option leg rather than charged explicitly, so the true cost is hard to compare.
  • No dividends. Index-linked notes track price returns, forfeiting the dividend yield — a material drag over five years.
  • Barrier and path dependency. A reverse convertible that breaches its barrier converts a "defensive" holding into a concentrated equity position at exactly the wrong moment.

Legitimate uses are narrow and specific: defining a known payoff for a client with a fixed future liability, generating income from a range-bound view, or gaining exposure to a market a client cannot otherwise access. Structured products are capital-at-risk investments sold to clients who often believe they are buying deposits, which is why disclosure and appropriateness testing are so heavily supervised.


Commodity Funds

Direct commodity ownership is impractical for a private client — storage, insurance, assay and transport make physical delivery prohibitive for everything except precious metals. Commodity funds solve the access problem in one of three ways.

RouteMechanismPrincipal issue
Physically backed ETCAllocated bullion held in a vault, one certificate per barPractical only for gold, silver, platinum and palladium. Storage and insurance costs create a small annual drag
Futures-based fund or ETCHolds near-dated futures and rolls them forward before expiryRoll yield dominates long-run returns
Commodity equity fundBuys mining, energy and agribusiness sharesCorrelated with the equity market and exposed to company-specific risk; not a pure commodity exposure

Contango, backwardation and roll yield

A futures-based fund never takes delivery. As each contract nears expiry it sells the near contract and buys the next one, and the price difference between them is the roll yield.

  • Contango — the far contract is more expensive than the near one, the normal state for storable commodities because the futures price embeds storage and financing costs. The fund repeatedly sells low and buys high, producing a negative roll yield that erodes returns even when spot is flat.
  • Backwardation — the far contract is cheaper, typically when there is a shortage and a convenience yield attaches to holding the physical commodity. The fund sells high and buys low, earning a positive roll yield.

A worked illustration: a fund holds a contract at $80 which it sells at expiry, replacing it with the next contract at $84. It has lost roughly 5% to the roll before the spot price has moved at all. Over several years in persistent contango this compounds into a very large divergence between the fund's return and the headline commodity price — the single most common source of client complaint about commodity ETCs.

Uses in a portfolio

Commodities offer positive sensitivity to unexpected inflation and low correlation with financial assets, which is their entire diversification case. Against that they produce no income, carry high volatility, and — for futures-based vehicles — bleed roll cost. Most multi-asset allocations therefore hold a small commodity sleeve for inflation protection rather than for expected return, with gold treated separately as a monetary and crisis hedge rather than as an industrial commodity.


Sukuk

Sukuk (singular sakk) are certificates of investment that comply with Shariah, Islamic law. They are frequently and wrongly called "Islamic bonds"; the distinction matters and is examinable.

The underlying prohibitions

Shariah prohibits:

  • Riba — interest, or any predetermined return on the mere lending of money.
  • Gharar — excessive uncertainty or ambiguity in a contract.
  • Maysir — gambling and speculation.
  • Investment in prohibited (haram) activities: alcohol, pork, conventional financial services, gambling, adult entertainment and, in most interpretations, tobacco and weapons.

A conventional bond fails on the first count: it is a loan paying interest. A sukuk instead confers an undivided beneficial ownership interest in a tangible asset, a usufruct (right of use), a service, or a defined business venture. The return the holder receives is rent, profit share or sale proceeds generated by that asset — an ownership return rather than a lending return.

Common structures

StructureMechanism
IjaraSale and leaseback. A special purpose vehicle buys an asset, leases it to the originator, and passes the rental stream to certificate holders. The most common sovereign structure
MurabahaCost-plus sale. The SPV buys a commodity and sells it to the obligor at a disclosed mark-up payable in instalments
MudarabaPartnership between a capital provider and a manager, sharing profit on an agreed ratio; losses fall on the capital provider
MusharakaJoint venture where all parties contribute capital and share profit by agreement and loss in proportion to capital
WakalaAgency. The SPV appoints the obligor as agent to invest the proceeds in a Shariah-compliant portfolio targeting a stated return
Salam / IstisnaForward purchase of a commodity, or financing of an asset under construction

Asset-backed versus asset-based — the distinction that decides recovery

  • Asset-backed sukuk give holders true legal ownership of, and recourse to, the underlying asset. On default, holders can look to the asset itself. These are relatively rare.
  • Asset-based sukuk transfer only beneficial title, and repayment depends on the originator's purchase undertaking to buy the asset back at par. On default, holders rank as unsecured creditors of the originator, exactly like conventional bondholders. The great majority of the market is asset-based, and the 2009 Nakheel and subsequent Gulf restructurings exposed how little practical difference there was from a conventional claim.

Governance and market

Every issue requires certification by a Shariah supervisory board, and standards are set principally by AAOIFI (the Accounting and Auditing Organisation for Islamic Financial Institutions) and the IFSB. Sukuk are rated by the conventional agencies and trade primarily over the counter. Malaysia, Saudi Arabia, Indonesia, the UAE and Qatar dominate issuance; the United Kingdom became the first Western sovereign to issue sukuk in 2014, with a £200m ijara issue, refinanced by a £500m issue in 2021.

Use in a portfolio. For a Shariah-observant client, sukuk substitute for the entire fixed income allocation — noting that the universe is narrower, more concentrated in Gulf and Malaysian credit, and generally less liquid than conventional bonds. For a conventional investor, sukuk are simply another credit exposure whose legal recovery mechanics must be understood before purchase. The adviser must also remember that a Shariah mandate imposes screening on the equity sleeve as well, excluding conventional banks and insurers and applying gearing and interest-income ratio filters.

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Three Manufactured Exposures and What the Investor Actually Holds
Test Your Knowledge

A client is offered a five-year note described as offering '100% capital protection plus 60% participation in the FTSE 100'. Which risk should the adviser identify as the most significant, and why?

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Test Your Knowledge

A futures-based commodity ETC has delivered a materially lower return over five years than the rise in the spot price of the underlying commodity, despite charging a low annual fee. What is the most likely explanation?

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B
C
D
Test Your Knowledge

What most accurately distinguishes a sukuk from a conventional bond?

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D