BIST 100 opens the week up 1.42%

Borsa Istanbul's BIST 100 rose 1.42% on Monday, October 5, closing at 12,443.92 after trading between 12,373.11 and 12,528.60. The rebound followed sharp drops of 2.74% on September 24 and 2.79% on September 30 that had pushed the index below 12,000.

Banks, telecoms and chemicals gained while machinery and construction fell. ASTOR led turnover with 12.86 billion lira, followed by ASELS at 12.76 billion and AKBNK at 12.25 billion. YBTAS, ATEKS and MIATK hit the 10% daily limit up; GENIL, IZFAS and ISVEA fell 10%.

The dollar traded at 49.15 lira and the euro at 55.16. Gold was 6,540.55 lira per gram and $4,139.25 an ounce; Brent was $102.49 and bitcoin $85,489.

Late September selling came from rising global bond yields and a domestic fund investigation in which 58 people were detained and the Capital Markets Board opened a refund account for investors. Monday's rebound was helped by weak US data: the economy added only 29,000 jobs in September against 90,000 expected, cutting the odds of a Fed hike.

Energy equipment and defense names such as ASTOR and ASELS led alongside banks, reflecting investor themes around grid investment, defense spending and rising power demand from AI data centers.

September inflation data from TÜİK this week will shape expectations for central bank policy. The fund investigation and global yields remain in focus, and a break above about 12,500 would be the first sign the rebound can hold.

The BIST 100 tracks the 100 largest and most traded companies on Borsa Istanbul and is the main gauge of Turkish equities. Daily moves of 1-3% are normal for emerging markets, but back-to-back drops above 2.5% signal a real hit to confidence.

Market swings reach businesses through rates and currency. Put the inflation release on your calendar, use calm currency periods to plan imported purchases, and keep ad budgets flexible week to week. This is not investment advice.