Stock Markets April 21, 2026 11:30 AM

Istanbul bourse slips as telecoms, tech and textile stocks lead declines

BIST 100 closes down 0.76% as market breadth favors losers; select stocks reach record highs amid commodity and FX moves

By Priya Menon
Istanbul bourse slips as telecoms, tech and textile stocks lead declines

Turkey's equity benchmark, the BIST 100, ended Tuesday's session lower, pressured by losses in the Telecoms, Technology and Textile & Leather sectors. Market breadth favored decliners, though several individual names posted strong gains and two reached all-time highs. Commodity prices and Turkish lira cross rates also moved notably during the session.

Key Points

  • BIST 100 closed down 0.76%, with Telecoms, Technology and Textile & Leather sectors leading losses.
  • Top performers included IS:EFOR (+8.72%), IS:KTLEV (+7.64%, record high) and IS:DSTKF (+5.35%, record high); largest decliners included IS:GLRMK (-9.98%), IS:KONTR (-9.98%) and IS:HEKTS (-6.61%).
  • Commodities and FX moved during the session: June Gold futures down 1.40%, June crude up 2.88%, June Brent up 2.94%; USD/TRY rose to 44.89 and EUR/TRY fell to 52.81.

Market close overview

Turkey's stock market finished the trading day in negative territory as sectoral declines in Telecoms, Technology and Textile & Leather weighed on the benchmark. At the close in Istanbul, the BIST 100 declined 0.76%.


Top gainers

  • Efor Yatırım Sanayi ve Ticaret A.Ş. (IS:EFOR) led the gainers, rising 8.72% or 0.78 points to close at 9.73.
  • Katilimevim Tasarruf Finansman AS (IS:KTLEV) climbed 7.64% or 7.10 points to finish at 100.00.
  • Destek Finans Faktoring As (IS:DSTKF) added 5.35% or 123.00 points to end the session at 2,423.00.

Largest decliners

  • Gulermak Agir Sanayi Insaat ve Taahhut AS (IS:GLRMK) fell 9.98% or 24.30 points, closing at 219.10.
  • Kontrolmatik Teknoloji Enerji ve Mu (IS:KONTR) dropped 9.98% or 1.44 points to 12.99 at the close.
  • Hektas Ticaret TAS (IS:HEKTS) declined 6.61% or 0.23 points to finish at 3.25.

Market breadth and notable moves

Declining issues outnumbered advancing ones on the Istanbul Stock Exchange by 379 to 224, while 16 stocks ended unchanged. Two names in the session reached record highs: Katilimevim Tasarruf Finansman AS (IS:KTLEV) rose to an all-time high of 100.00 after a 7.64% gain, and Destek Finans Faktoring As (IS:DSTKF) climbed to an all-time high of 2,423.00 following a 5.35% advance.


Commodities and currency

On the commodities front, Gold Futures for June delivery fell 1.40% or 67.50 to $4,761.30 a troy ounce. Oil prices advanced: crude oil for June delivery rose 2.88% or 2.52 to $89.94 a barrel, while the June Brent contract gained 2.94% or 2.81 to trade at $98.29 a barrel.

FX pairs involving the Turkish lira showed modest moves. USD/TRY was up 0.05% at 44.89, while EUR/TRY declined 0.21% to 52.81. The US Dollar Index Futures was higher by 0.27% at 98.17.


Contextual note

The session highlighted a mix of concentrated gains in select stocks and broader declines tied to specific sectors. Commodity and FX price moves were notable alongside equity action.


Product mention included in session commentary

Readers were also presented with a promotional note about an investment research product that combines institutional data with AI-driven insights and a limited-time pricing message.

Risks

  • Market breadth skewed toward declines, with 379 stocks falling versus 224 rising - this heightened downside risk for sectors already under pressure, including Telecoms, Technology and Textile & Leather.
  • Volatility in commodity prices, evidenced by declines in gold and gains in crude oil and Brent, could affect companies sensitive to input costs and commodity-linked revenues.
  • Movements in currency pairs, such as a stronger USD/TRY and a weaker EUR/TRY, introduce exchange-rate risk for exporters, importers and companies with lira-denominated liabilities.

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