Banco Santander and NatWest sell record AT1 bonds with 10-year calls, locking in cheap capital

Banco Santander and NatWest have issued record AT1 (Additional Tier 1) bonds with 10-year call dates, allowing banks to lock in favorable borrowing costs while deferring refinancing decisions. This trend of extended call periods reflects banks' strategy to secure cheap capital in uncertain market conditions, though it shifts refinancing risk onto future periods and extends uncertainty for bond investors.

AT1 bonds represent a critical component of bank capital structures, sitting between equity and senior debt in the liability hierarchy. By extending call dates to 10 years, Santander and NatWest are capitalizing on current favorable market conditions to secure long-term funding at attractive rates. This strategy allows banks to avoid near-term refinancing pressures while rates potentially rise or credit conditions deteriorate. The record issuance volume suggests strong investor appetite despite the extended uncertainty these instruments introduce.

Historically, AT1 bonds have been contentious instruments—they carry conversion or writedown risks during financial stress, making them structurally subordinated to senior creditors. Regulators introduced these requirements post-2008 to ensure banks maintained adequate loss-absorbing capacity. The current trend toward longer call dates reflects both favorable market conditions and bank treasurer preferences to minimize refinancing frequency in volatile environments.

For fixed-income investors, extended call dates present a double-edged sword. While longer maturities theoretically provide more yield, they also extend the period during which banks might face incentives to refinance if rates fall or conditions improve. This creates reinvestment risk and potential opportunity cost. For the broader financial system, record issuance volumes at favorable terms suggest confidence in bank creditworthiness, yet the compressed spreads may not adequately compensate investors for tail risks inherent in subordinated instruments.

Market participants should monitor whether this trend continues or faces headwinds from macro policy shifts. Rising rate expectations or banking sector stress could rapidly reverse pricing, creating significant mark-to-market losses for AT1 bond holders and constraining future issuance.

• →Santander and NatWest issued record AT1 bonds with 10-year call dates, securing cheap capital in favorable market conditions.
• →Extended call periods defer refinancing risk to future years while increasing investor uncertainty and tail risk exposure.
• →AT1 bonds sit subordinated in capital structures and carry conversion or writedown risks during financial stress.
• →Record issuance volumes suggest strong investor appetite, but compressed spreads may undercompensate for embedded risks.
• →Macro policy shifts or banking sector stress could reverse pricing trends and limit future AT1 bond issuance.