By the FinLingo Team | Capital markets practitioner, front office experience at a major European investment bank. FinLingo covers 342 lessons from bonds to exotic derivatives. About · Last updated:
A Capital Protected Note (CPN) guarantees the investor receives at least 100% of their principal at maturity, regardless of market performance. Any positive return on the underlying is added on top. The trick is in the construction: the guarantee and the upside come from two separate instruments working together.
Take €100. Buy a zero-coupon bond (ZCB) that pays €100 at maturity. At a 3.2% rate over 5 years, this ZCB costs €85.30. You have €14.70 left. Subtract 1–2% issuer margin. Use the remaining €12.70–13.70 to buy a call option on the underlying index. The ZCB provides the capital protection. The call provides the upside participation.
If a 5-year ATM call on the Euro Stoxx 50 costs 16% of notional, and your option budget is 12.7%, your participation rate is 12.7% / 16% = 79%. If the index rises 20%, you earn 20% × 79% = 15.8%. You cannot lose principal, but you participate in less than 100% of the upside. To get full participation, the call must cost less than or equal to the option budget.
Higher interest rates make the ZCB cheaper, leaving more budget for the call. At 4.0% rates over 5 years, the ZCB costs €81.90 — the option budget jumps to €16.10. At 1.0% rates, the ZCB costs €95.10 — only €2.90 for the call. This is why CPNs surged in popularity in 2023–2024 when ECB rates reached 4.0%, and were nearly impossible to structure during the zero-rate era of 2015–2021.
The guarantee applies at maturity only — not during the note's life. If you sell early, you may receive less than 100%. The guarantee is also only as strong as the issuer's credit. Lehman Brothers issued capital-protected notes. When Lehman defaulted in 2008, investors lost their principal despite the guarantee.
The CPN invests most of the principal in a zero-coupon bond that guarantees repayment of 100% at maturity. The remaining budget is used to buy a call option for upside exposure. Even if the underlying drops to zero, the ZCB matures at par. However, this guarantee depends on the issuer remaining solvent and only applies at maturity, not during the note life.
Three factors: interest rates (higher rates make the ZCB cheaper, freeing more budget for the call), implied volatility (lower vol makes the call cheaper, so the same budget buys more participation), and maturity (longer maturity compounds both effects). In a high-rate, low-vol environment, participation rates above 100% are possible using leveraged call structures.
Because at near-zero rates, the ZCB costs almost 100% of the notional, leaving virtually no budget for the call option. A 5-year ZCB at 0.5% costs about 97.5%, leaving only 0.5 to 1.5% after margin for the call. This translates to a participation rate of 5 to 10%, making the product unattractive. CPNs only become compelling when rates are high enough to create meaningful option budgets.
FinLingo covers capital protected products in Level 5 — 9 units from basic CPNs to call-spread variants. Level 1 is free.
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