In one sentence
An adjustable long-term putable security is a long-dated bond-like instrument whose coupon resets (floating rate) and that gives the investor a right to “put” (sell back) the instrument at specified dates, sometimes with cash flows linked to more than one currency.
Intuition: it’s a bond plus embedded options
A useful way to understand complex fixed-income products is to decompose them into simpler pieces:
- Floating-rate note (FRN): coupon resets to a reference rate (e.g., SOFR + spread), so interest-rate duration is typically low.
- Investor put option: the investor can tender the bond back at a preset price on certain dates, which caps downside from rising yields or widening spreads.
- (Optional) currency feature: if coupons/principal are paid in a different currency than the funding/valuation currency, the holder bears FX exposure unless hedged.
A simple cash-flow sketch (coupon reset + put payoff)
If the coupon resets each period to a reference rate plus a spread, a stylized coupon is:
\[ \text{Coupon}{t} \approx (r{ref,t} + s)\,\Delta t \times N \]
where $r_{ref,t}$ is the reference rate for the reset period, $s$ is the contractual spread, $\Delta t$ is the year fraction, and $N$ is notional.
If the investor has a put at date $\tau$ at put price $K$ (often near par), the put option payoff at $\tau$ is:
\[ \text{Put payoff}{\tau} = \max\left(K - P{\tau},\; 0\right) \]
where $P_{\tau}$ is the market price of the bond just before exercise.
flowchart TD
A["Adjustable long-term putable security"] --> B["FRN component<br/>(rate resets)"]
A --> C["Put option<br/>(investor can sell back)"]
A --> D["FX-linked cash flows (sometimes)"]
C --> E["Shorter effective maturity<br/>(more like put date than final maturity)"]
D --> F["Currency risk unless hedged"]
Why an investor would hold it
Compared with a plain fixed-rate long bond, a putable FRN can be attractive when the investor wants:
- protection against adverse rate moves (via the put),
- less sensitivity to rate changes (via the floating coupon),
- optionality/value in uncertain environments (liquidity and rebalancing flexibility),
- and possibly higher yield to compensate for embedded complexity or FX risk.
Why an issuer would issue it
Issuers can use these structures to broaden the investor base or lower funding costs in some states of the world, but they are selling the investor a put (i.e., the issuer is short that option). That means the issuer faces refinancing risk if many investors exercise puts during stress.
Key risks
- Credit risk: the issuer may default; the put is only as good as the issuer’s ability to pay.
- Liquidity risk: secondary markets can be thin; valuation becomes model-dependent.
- Model/structure risk: multiple moving parts (rates, spreads, FX) and path dependence.
- FX risk (if dual-currency): cash flows in one currency and funding in another create exposure.
Related Terms with Definitions
- Convertible Bond: A type of bond that can be converted into a predetermined number of shares of the issuing company.
- Callable Bond: A bond that can be redeemed by the issuer prior to its maturity at specified terms.
- Floating Rate Note (FRN): A debt instrument with a variable interest rate that adjusts periodically.
- Putable Bond: A bond that gives the holder the right to sell it back to the issuer at specified dates and prices.
- Dual Currency Bond: A bond whose cash flows are linked to more than one currency (e.g., coupon in one currency, principal in another).