Union #1 [1997 - 2000]

Bruce Kulick - lead guitar, vocals
John Corabi - vocals
Jamie Hunting - bass
Brent Fitz - drums

Gene Simmons solo #4 [Aug 2017 - Aug 2018]

Gene Simmons - bass, vocals
Phil Shouse - guitar
Ryan Cook - guitar
Jeremy Asbrock - guitar
Brent Fitz - drums

The Kulick Brothers [Oct 2017 - Oct 2018]

Bruce Kulick - guitar
Bob Kulick - guitar
Todd Kerns - bass, vocals
Brent Fitz - drums

Bruce Kulick solo #2 [Oct 2018 - Oct 2022]

Bruce Kulick - guitar
Todd Kerns - guitar, vocals
Zach Throne - bass
Brent Fitz - drums, vocals

Bruce Kulick solo #3 [Oct 2022 - Nov 2022]

Bruce Kulick - lead guitar
Todd Kerns - rhythm guitar, vocals
Chaz Coats-Butcher - bass, vocals
Brent Fitz - drums, vocals

Bruce Kulick solo #2 reunion [Nov 2022 - Nov 2025]

Bruce Kulick - guitar
Todd Kerns - guitar, vocals
Zach Throne - bass
Brent Fitz - drums, vocals

Bruce Kulick solo #4 [Nov 2025 - present]

Bruce Kulick - guitar
Todd Kerns - guitar, vocals
Joe McGinness - bass, vocals
Brent Fitz - drums, vocals