Amir al-Sha'bi said: In the time of the Messenger of Allah (peace and blessings be upon him), six Companions from the Ansar gathered the Qur'an: Zayd bin Thabit, Abu Zayd, Mu'adh bin Jabal, Abu al-Darda', Sa'd bin Ubadah and Ubayy bin Ka'b (may Allah be pleased with them). And in the narration of Zakariyya it says that Sayyiduna Jariyah bin Mujammi' bin Jariyah (may Allah be pleased with him) had also read the whole Qur'an except for one or two surahs.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2079