August 18, 2026
International index provider FTSE Russell has postponed certain index changes involving Turkish equities due to changes in the methodology used by Türkiye’s Central Securities Depository (MKK) to calculate free-float ratios.
According to a statement issued by FTSE Russell, the decision follows a new free-float calculation methodology introduced by MKK on June 15, 2026, with the approval of Türkiye’s Capital Markets Board (SPK).
Under the new methodology, certain fund shares attributed to strategic partners are excluded from the free-float calculation. As a result, the free-float ratios published by MKK have fallen below the figures independently calculated by FTSE Russell based on publicly disclosed information from listed companies.
FTSE Russell said it views MKK’s methodology revision as a positive development. However, the index provider noted that the available data cannot yet be fully reconciled with its own methodology and guidelines.
MKK currently provides an aggregate figure for fund shares classified as restricted rather than a detailed breakdown of these holdings. FTSE Russell is therefore delaying the relevant index updates until the differences between the two calculation approaches can be resolved.
The decision could affect the weightings and classification of Turkish stocks in FTSE Russell indexes, potentially influencing passive funds and international investors that track these benchmarks.
Source: Patronlar Dünyası/ Prepared by: İlayda Gök