This what I gathered from the book Mafia Inc. and the 2006 Project Colisée investigation where more than 91 people were rounded up and five were believed acting as leaders.

Vito Rizzuto(Acting boss)
Nick Rizzuto(Vito's son)DECEASED
Nicolo Rizzuto(Vito's father)DECEASED
Francesco Arcadi(assumed the role of leadership after Vito Rizzuto's arrest on Jan. 20, 2004 for racketeering)JAILED
Paolo Renda(brother-in-law of Vito)(?)
Rocco Sollecito(longtime Rizzuto associate)(?)
Francesco (Chit) Del Balso(lieutenant of Francesco Arcadi, supervised all aspects of the organization's multimillion-dollar bookmaking operation)(?)
Lorenzo Giordano(Francesco Arcadi lieutenant)(?)
Giuseppe De Vito(was smuggling cocaine for the family)JAILED
Giuseppe (Closure) Colapelle(De Vito's partner for a brief period because of a conflict) DECEASED
Moreno Gallo(was recorded delivering stacks of cash to the leaders of the Rizzuto crime family)DEPORTED
Desiderio (Desi) Pompa(bodyguard at the highest levels of the Mafia in Montreal)JAILED
Antonio (Tony) Mucci(influential mob figure in Montreal?)(?)

This is from the Charbonneau Commission:
Paolo Catania
Tony Renda(Paolo's brother)
Frank Arcadi
Nicolo Milioto (intermediary between contractors and the Rizzuto mafia clan)
Rocco Sollecito(In charge of dealing with construction cash for the Rizzuto)
Frank Catania(Construction Frank Catania and Associates)
Joey Piazza(TGA)
Lino Zambito(was giving his contract money to Milioto or Vito)
Domenic d'Allosio (?) (A.T.A Inc)
Franco Capello (Excavations Super Inc)
Francesco Catania (Catania and Associates)
Domenic Cammalleri (Constructions Mirabeau)
Tony Conte (Deceased)
Joe Salvo(Constructions Canasa Inc)


Boss
"Vito rizzuto"
Underboss
"Jos Di Maulo"
Consigliere
"Nicolo Rizzuto"
Captains/ lieutenants
"Francesco Arcadi"
"Nicodemo Cotroni"
"Frank Martorana"
"Vincenzo Di Maulo"
"Giuseppe Morello"
"Valentino Morielli"
"Emanuele Ragusa"
Soldiers
"Vincenzo De Santis"
"Francesco Cotroni Jr."
"Antonio Marabella"
"Sabatino Niccolucci"
"Leonardo Paccione"
"Antonio Teoli"
"Domenico Tozzi"
"Anthony Volpato"
"Raynald Desjardins"
"Raymond Fernandez"
"William "Willie Obie" Obront"
"Réal Simard"
Some more high-ranking members include -

Francesco Del Balso
Lorenzo Giordano
Paolo Renda
Rocco Sollecito

Other members and associates -

Constantine Alevizos
Ennio Bruni
Antony Capitanio
Antonio Caputo
Martino Caputo
Joseph Di Maulo
Andrea Di Paolo
Frank Faustini
Juan Ramon Fernandez
Moreno Gallo
Felice Italiano
Ray Kahno
Tony Mucci
Sabatino Nicolucci
Gaetano Panepinto
Anthony Papalia
Roberto Papalia
Sébastien Pierre-Louis
Giovanni Petrella
Joseph Renda
Pietro Scarcella
Girolamo Sciortino
Stefano Sollecito
Giuseppe Torre
Michele Torre
Pietro Triassi
Mariano Turrisi
Dario Zanetti
Benjamin Zappia
CREDITS TO furio_from_naples