US 10‑Year at Multi‑Decade Highs: Long‑dated African Eurobonds Face Duration‑Led Pressure

US 10‑year Treasury yields rose to levels not seen since 2007 in mid‑September 2026, re-pricing the global risk‑free discount rate. That upward move recalibrates duration-sensitive valuations across sovereign and corporate credit globally. Transmission into African markets operates through discount rate and funding-cost channels. Higher US yields increase the risk-free base used to price dollar‑denominated African Eurobonds, making long-dated paper most vulnerable through duration and convexity: countries with extended amortisation profiles and longer benchmarks — for example long-dated Ghanaian and Nigerian Eurobonds — will face larger mark-to-market losses and spread widening pressure. Separately, higher US yields raise global dollar funding costs and push investors toward higher-quality G7 assets, increasing external refinancing premia for dollar‑issuers in Africa. This repricing widens the gap between relatively lower‑beta sovereigns (e. g.

, Morocco, South Africa) and higher‑beta, commodity‑dependent credits (e. g. , Ghana, Zambia); long-dated tranches in the higher‑beta names will lead the spread underperformance. Currency channels matter too: a stronger dollar profile increases imported inflation and external debt servicing burdens in FX-short countries, compounding local rate pressures where central banks respond. The desk will track two conditional thresholds: persistence of the higher US yield regime across the curve (notably 10s vs 2s) and secondary market flows out of EM credit into G7 duration. Those will determine whether current spread moves are a revaluation shock or the start of sustained wider external premiums on African long-dated debt.