Warsaw, August 21, 2026

Communiqué

GPW Benchmark announces that following the trading session on August 31, 2026, there will be a periodic change of corporate bond index (POLCBF) portfolio. The index will undergo the following changes:

• new instruments*: EFLSA018, PEOH331, MIH0631, MBH0629, IBH0630,
• removed instruments*: PEOH308, PKO0827.

  Attached is the composition of the POLCBF index portfolio after changes.