EN
The constant proportion portfolio insurance (CPPI) strategy is one of the strategies the main aim of which is to protect the minimum value of the investor's portfolio. That strategy is one of the active strategies - each changing in prices causes modifications in the portfolio structure. The CPPI strategy is used by some mutual funds that operate at the Polish stock market. The aim of the paper is to check if that strategy is efficient in the Polish market in a long time. It will be checked after implementing the CPPI strategy to the portfolio that replicates the WIG20 index.