We report the discovery of planetary companions orbiting four low-luminosity giant stars with M _ { \star } between 1.04 and 1.39 M _ { \odot } .
All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS ( EXPRESS ) program and the Pan-Pacific Planet Search ( PPPS ) .
The companion signals were revealed by multi-epoch precision radial velocities obtained during nearly a decade .
The planetary companions exhibit orbital periods between \sim 1.2 and 7.1 years , minimum masses of m _ { p } sin i \sim 1.8 - 3.7 M _ { J } and eccentricities between 0.08 and 0.42 .
Including these four new systems , we have detected planetary companions to 11 out of the 37 giant stars that are common targets between the EXPRESS and PPPS .
After excluding four compact binaries from the common sample , we obtained a fraction of giant planets ( m _ { p } \gtrsim 1 - 2 M _ { J } ) orbiting within 5 AU from their parent star of f = 33.3 ^ { +9.0 } _ { -7.1 } \% .
This fraction is significantly higher than that previously reported in the literature by different radial velocity surveys .
Similarly , planet formation models under predict the fraction of gas giant around stars more massive than the Sun .