Borsa Istanbul Q1 2026: Rates, inflation and oil shadow earnings

Borsa Istanbul’s first-quarter 2026 earnings season saw major listed companies and banks announce quarterly results in early May, with many reporting higher revenues year-on-year but facing clear macro headwinds. The reporting calendar, anchored by Kamuyu Aydınlatma Platformu (KAP) filings, concentrated disclosures over a short window and kept investor focus on corporate fundamentals.

In the banking segment, Turkey İş Bankası (ISCTR) surprised to the upside with a net profit of 20,459,251,000 TRY for the period January–March 2026, signalling stronger core banking earnings; other lenders such as Yapı Kredi posted improved return on tangible equity driven by margin gains. These bank-level outcomes were a key driver of the quarter’s aggregate performance and shaped sector-level sentiment.

Non-bank sectors presented mixed results: industrial and consumer-facing firms mostly recorded revenue growth, but energy-intensive businesses suffered from elevated crude costs and FX-sensitive input prices, compressing EBITDA and net margins in several cases. The clustering of large disclosures amplified intraday volatility for affected names and for the broader index as investors re-priced expectations.

Macroeconomic context remains central: official data from the Turkish Statistical Institute (TÜİK) showed headline consumer inflation near the low- to mid-30s percent range in the spring of 2026, keeping real financing costs and operational pressures elevated for many firms. Concurrently, higher global oil price forecasts and geopolitical risk pushed energy costs up, reinforcing upward pressure on corporate cost bases. These combined forces help explain why revenue growth did not uniformly translate into margin expansion.

Analysts suggest that near-term market direction will hinge on inflation prints, central bank policy signals and the evolution of oil prices; companies with strong FX hedging, healthy cash flow generation and lower leverage are expected to outperform in this environment. For investors, the emphasis is on selective stock selection and scenario-based stress testing of earnings sensitivity to rates, inflation and commodity trends.