İstanbul prosecutor flags suspected stock manipulation

[No verifiable market reaction or regulator response date available; the source did not include an SPK deadline.]

İstanbul Cumhuriyet Başsavcılığı sent a memo to the Capital Markets Board on August 19, 2026 citing roughly 100-fold rises in some Borsa İstanbul shares and flagging possible organised manipulation.

Capital Markets Board memo

Officials said the document reported that digital data had detected out-of-sequence value jumps in specific tickers and that some price moves were consistent with coordination through pooled funds. Data showed the memo identified individual issues whose prices climbed by up to about 100 times the earlier reference level, the office said.

The prosecutor's office asked the regulator to review the trades and examine whether trading through funds or related accounts had driven the moves, officials said. The memo did not, in the version provided, list named firms or give a public timetable for the regulator's reply.

Market participants will watch for any formal SPK

statement; trading desks and compliance teams will also likely recheck positions in the flagged names.

If the SPK issues a formal reply by September 28, 2026, then exchanges and brokers may move to freeze or unwind anomalous positions pending further probe; if no reply appears by that date, scrutiny is likely to focus on enforcement actions once regulator and prosecutor files are exchanged.