Here's what is on the AEA website concerning Cirque shows.
"Alert: Cirque du Soleil's shows (with the exception of BANANA SHPEEL, IRIS and ZARKANA) are non-union productions
Producer: Cirque du Soleil, MSG Entertainment and BASE Entertainment
AEA, SAG-AFTRA, AGMA, and AGVA members are advised that there is NOT a union contract in place for these productions, except for BANANA SHPEEL, IRIS and ZARKANA. Members of Actors' Equity as well as other entertainment Unions may NOT accept employment in these productions without an appropriate union contract.
Equity Franchised Agents are reminded that it is a violation of the Agency Regulations to submit Equity members for non-union work.
If you are approached about employment on these productions, please contact Flora Stamatiades, National Director, Organizing and Special Projects at 212.869.8530, or by email at flora@actorsequity.org."