BIST 100’s Top Gainers and Losers of the Day: A Technical and Quantitative Deep Dive

The Istanbul Stock Exchange saw heightened volatility on August 24 2026, with the BIST 100 index climbing 7,845.12 points, up 2.3%.

Pulse of Sectoral Rotation

Energy and technology stocks attracted buyers, while financials and real estate faced seller pressure. Notably, Energy giants PETKIM and TUPRAS posted gains of 4.1% and 3.8%, underpinning the index’s rise.

Day’s Stand‑Out Winners

■ASELSAN (+7.6%, 1,245.30 TRY) – Boost from rising defense export demand.

■VESTEL (+6.9%, 112.45 TRY) – New‑generation TV panel capacity now online.

■KOÇ HOLDING (+5.8%, 84.20 TRY) – Improved margins in steel and automotive subsidiaries.

Leaders of the Decline

■Ereğli Demir ve Çelik (‑5.2%, 31.10 TRY) – Export slowdown and higher raw‑material costs.

■İŞ BANK (‑4.7%, 9.85 TRY) – Rising credit‑risk in loan portfolio.

■THY (‑4.3%, 18.60 TRY) – Fuel price surge and uncertain passenger demand.

Fibonacci & Ichimoku Support‑Resistance Framework

■The 0.618 Fibonacci retracement sits at 7,720.00 points, providing a solid support.

■In the Ichimoku cloud, the Kijun‑sen lies at 7,680.00 points; staying above the cloud signals a continued uptrend.

Moving Averages & Momentum Indicators

■20‑day EMA at 7,795.00, 50‑day SMA at 7,730.00 – Short‑term momentum remains bullish.

■RSI(14) at 62, edging toward overbought, while the MACD histogram expands positively.

Tactical Positioning Recommendations

■Short‑term longs: ASELSAN and VESTEL could target 7,900.00 points if they break above the 20‑EMA.

■Stop‑loss: For Ereğli Demir ve Çelik, exit below 30.50 TRY to limit downside.

■Option play: Take a call on the BIST 100 at 7,800.00; a confirmed break above the cloud can maximize upside.

Markets appear poised to sustain the BIST 100’s short‑term upside, given the robustness of technical signals and clear sectoral rotation. However, stocks like Ereğli Demir ve Çelik demand tight stop‑loss safeguards amid heightened volatility. A break below the 0.618 Fibonacci level will be the decisive test for breaching the 8,000‑point barrier. Within this context, gravitating toward high‑liquidity, low‑volatility leaders offers the most efficient risk‑adjusted return profile.