Od mája 2005 spoločnosť Pioneer Investments premenovala niekoľko fondov a ďalšie zlúčila. Zmeny sú uvedené v nasledujúcich tabuľkách.
Premenované fondy
| Pôvodný názov | Nový názov |
| Pioneer Funds Global Telecoms | Pioneer Funds Global TMT |
| Pioneer Funds Global Financials | Pioneer Funds Top Global Players |
| Pioneer Funds International Short Term | Pioneer Funds Multi Currency Strategy |
| Pioneer Funds U.S. Growth | Pioneer Funds U.S. Large Cap Growth |
| Pioneer Funds PioneerMix 1 | Pioneer Funds Total Return Defensive |
Zlúčené fondy
| Zanikajúci fond | Prijímajúci fond |
| Pioneer Funds Global Technology | Pioneer Funds Global TMT |
| Pioneer Funds Global Industrials | |
| Pioneer Funds Global Healthcare | Pioneer Funds Top Global Players |
| Pioneer Funds Global Energy | |
| Pioneer Funds Euro Reserve | Pioneer Funds Euro Short Term |
| Pioneer Funds PioneerMix 5 | Pioneer Funds Global Ethical Equity |