He transmitted a sizeable number of hadiths. The Musnad of Baqī ibn Makhlad cites sixty-two reports from him, five of which appear in the two Ṣaḥīḥs.
Among those who narrated from him were: ʿAlī, Ibn ʿAbbās, Abū Mūsā al-Ashʿarī, Abū Umāmah al-Bāhilī, Jābir ibn ʿAbd Allāh, Muḥammad ibn al-Ḥanafiyyah, ʿAlqamah, Zirr, Abū Wāʾil, Hammām ibn al-Ḥārith, Nuʿaym ibn Ḥanẓalah, ʿAbd al-Raḥmān ibn Abzā, Nājiyah ibn Kaʿb, Abū Lās al-Khuzaʿī, ʿAbd Allāh ibn Salamah al-Murādī, Ibn al-Ḥawtakiyyah, Tharwān (1) ibn Milḥān, Yaḥyā ibn Jaʿdah, al-Sāʾib—the father of ʿAṭāʾ—Qays ibn ʿAbbād, Ṣilah ibn Zufar, Mukhāriq ibn Sulaym, ʿĀmir ibn Saʿd ibn Abī Waqqāṣ, Abū al-Bakhtarī, and a number of others.
Ibn Saʿd relates: ʿAmmār’s father, Yāsir ibn ʿĀmir, together with his two brothers al-Ḥārith and Mālik, travelled from Yemen to Mecca in search of another brother. The two brothers eventually returned, but Yāsir remained. He entered into an alliance with Abū Ḥudhayfah ibn al-Mughīrah ibn ʿAbd Allāh ibn ʿUmar of Banū Makhzūm, who married him to a slave woman of his named Sumayyah bint Khabbāṭ. She bore him ʿAmmār, and Abū Ḥudhayfah later set the child free.
After Abū Ḥudhayfah’s death, and once Allah brought forth Islam, ʿAmmār, his parents, and his brother ʿAbd Allāh all embraced the faith.
Sumayyah subsequently married Yāsir al-Azraq the Byzantine (2), the servant of al-Ḥārith ibn Kaladah al-Thaqafī; he was himself a Companion and the father of Salamah ibn al-Azraq (3).
It is said that ʿAmmār transmitted a little more than twenty hadiths in total.
A report from ʿAmmār states: “I was a peer of the Messenger of Allah ﷺ in age.” (4)