FTSE Russell Announces Index Overhaul for Turkish Equities

FTSE Russell announced that its FTSE Global Equity Index Series revisions will take effect on September 21 2026, introducing a fresh index framework for Turkish equities.

FTSE Russell’s New Index Blueprint

■FTSE Global Equity Index Series will add Turkey‑A and Turkey‑B sub‑segments.

■Turkey‑A: Companies within the BIST 100 that meet an 80% liquidity threshold.

■Turkey‑B: Firms outside BIST 100 with a market cap above $5 billion and a 30% liquidity threshold.

■Weighting will be recalculated based on free‑float and re‑balanced quarterly.

Ripple Effects on Turkish Markets

■Approximately 12% of the BIST 100 constituents will shift to the new Turkey‑A segment, potentially reducing the index’s overall volatility by 4.2%.

■Foreign investors’ ETF/ETP products will see an increased Turkey‑A weighting, with possible net inflows reaching $1.8 billion.

Strategic Positioning and Liquidity Impact

■Large banks such as İş Bank, Garanti BBVA, and Akbank will boost their weights in the new segment, reinforcing their benchmark status.

■Mid‑cap firms may experience credit‑cost fluctuations of 0.15‑0.25% due to reduced liquidity risk.

■Fibonacci retracement levels (0.618, 0.382) and Ichimoku clouds provide a technical support/resistance map aligned with the new index profile.

Caner Yılmaz – Director of Technical & Quantitative Analysis, BIST 100: "This FTSE Russell revision lifts Turkey’s visibility in global capital markets while delivering a liquidity‑centric structure. The Turkey‑A tier offers a clear reference point for algorithmic trading strategies, curbing short‑term volatility and fine‑tuning risk exposure. Investors should monitor the new weighting methodology and quarterly rebalancing schedule closely, as they will be pivotal for portfolio optimization."