US 10‑Year Yields Rise to Multi-Year Highs: Upside Pressure on African Eurobonds, Long-Dated Paper Most Exposed

US 10‑year Treasury yields climbed above 5. 1% on September 25, 2026, marking multi-year highs and contributing to a broad global bond selloff and upward pressure across yield curves. The move lifts the global risk-free discount rate that underpins valuation and funding costs for external borrowers. For African sovereign and corporate credit the mechanism is higher global discounting and a withdrawal of duration appetite. Long-dated African eurobonds suffer two channels: higher US yields directly raise required yields via the risk-free component, and duration-sensitive instruments incur larger price declines for a given parallel shift.

Credits with large upcoming external amortisation or long refinancing horizons—where pull-to-par is sensitive to duration—face wider required spreads. The stronger Treasury backdrop also tightens dollar funding conditions, which can weaken African currencies through reserve drawdown and raise the local-currency cost of servicing external debt, adding pressure to FX-sensitive issuers. Kenya is an example where higher US yields amplify existing external vulnerability: its eurobonds and long-dated maturities are mechanically exposed through duration and refinancing premium. The same pressure applies to other high-beta issuers with long external curves; sovereigns with shorter external profiles or stronger reserve cushions will comparatively outperform while long-end paper across the frontier complex is most at risk. The desk will monitor whether US-driven curve moves are accompanied by dollar strength and mark-to-market outflows from EM bond funds—those would materially extend spread widening into local rates and FX.