Why this matters in Saudi Arabia
Saudi banks have become regular issuers of Additional Tier 1 (AT1) sukuk, and for good reason: it is the instrument of choice for building bank capital in a Shariah-compliant market. Understanding what an AT1 sukuk is — and is not — matters for anyone reading bank disclosures, following the local debt market, or assessing a bank's capital position. This is a descriptive explainer, not investment advice.
What an AT1 sukuk is
An AT1 sukuk is a perpetual, Shariah-compliant instrument that a bank issues to build regulatory capital under the Basel III framework. Three features define it.
It is perpetual — there is no fixed maturity date. The bank may redeem it after a defined non-call period (often five or six years, described as PerpNC5 or PerpNC6), but it is not obliged to. Investors price it on the expectation of a call, not a maturity.
Its profit distributions can be cancelled. The bank can choose, or be required, to skip a distribution, and the skipped amount is typically non-cumulative — it does not accrue. This is a sharp difference from a conventional coupon.
It carries loss absorption. At the point of non-viability — the threshold at which the regulator determines the bank cannot continue without support — the instrument can be written down or converted, at the regulator's discretion. AT1 sukuk are commonly structured on a mudaraba basis to achieve this within a Shariah-compliant form.
Where it sits in the capital structure
Bank regulatory capital under Basel III has three layers. Common Equity Tier 1 (CET1) is the highest quality — ordinary shares and retained earnings, absorbing losses first. Additional Tier 1 (AT1) is the next layer: going-concern capital that absorbs losses while the bank is still operating, but does not meet every CET1 criterion. Tier 2 is gone-concern capital, absorbing losses only if the bank fails.
Only perpetual instruments qualify as AT1; Tier 2 instruments can have a maturity. In a bank's order of loss-bearing, an AT1 sukuk ranks below senior debt and depositors — it bears losses before they do — but above ordinary shares. That subordination is the trade-off for its profit distribution.
How it is regulated and issued
In Saudi Arabia, a bank's capital adequacy is supervised by the Saudi Central Bank, while listing and disclosure of the instrument run through the CMA and the Saudi Exchange. AT1 sukuk are frequently issued by private placement to qualified investors locally, or internationally under Regulation S, sometimes through a special-purpose vehicle. Saudi banks across the sector have issued them, and the format has become the standard route for GCC Islamic banks building Tier 1 capital.
The short version: an AT1 sukuk lets a bank strengthen its capital base without diluting shareholders — and the investor accepts perpetual tenor, cancellable distributions, and loss absorption in exchange for the return. That balance is the whole instrument.
