Most of the spectra for the planet-host stars analyzed in this paper were studied in Papers I (Santos et al., 2000A&A...363..228S), II (Santos et al., 2001A&A...373.1019S), and III (Santos et al., 2003, Cat. . We refer the reader to these for a description of the data. During the last year, however, we have obtained spectra for 18 more planet host stars. Most of the spectra were gathered using the FEROS spectrograph (2.2-m ESO/MPI telescope, La Silla, Chile), on the night of the 12-13 March 2003 (for HD47536, HD65216, HD72659, HD73256, HD73526, HD76700, HD111232, and HD142415) and with the SARG spectrograph at the TNG telescope (La Palma, Spain) on the nights of the 9-10 October 2003 (for HD3651, HD40979, HD68988, HD216770, HD219542B, and HD222404). In these runs we have also gathered spectra for HD30177, HD162020 (FEROS), and HD178911B (SARG), already previously analyzed. Finally, a spectrum of HD70642 with a S/N~150 was obtained using the CORALIE spectrograph (R=50000), at the 1.2-m Euler Swiss telescope (La Silla, Chile), on the night of the 21-22 October 2003. (4 data files).