There were two other Pakistanis part of the 20-member group of mountaineers who summitted the world's ninth tallest peak.
The ascent was confirmed by the Seven Summits, with whom Sajid is climbing and by the Alpine Club of Pakistan, the body that certifies successful summits. These are the first summits made during the ongoing summer climbing season in Pakistan.
Sajid Sadpara has successfully summitted Nanga Parbat 8,126 meters without the use of supplemental oxygen and personal assistance, wrote a social media account that routinely updates on Sajid's latest activities.
Sajid was part of the Seven Summits team, which saw 20 mountaineers make it to the summit.
He was part of the lead rope fixing team along with the famed Nepalese Sherpa Chhang Dawa Sherpa.
Seven Summits noted that a total of 20 mountaineers were part of the group that summitted at around 7 am on Monday morning.
They included Nepalese Kristin Harila, Tenjen Sherpa aka Lama, Pasang Nurbu Sherpa, Nima Rinji Sherpa, Dawa Sange Sherpa, Dendi Sherpa, Pasang Tenji Sherpa, Nima Dorje Sherpa, Lakpa Temba Sherpa, Ming Temba Sherpa, and Lakpa Temba Sherpa.
Other climbers included Swiss Sophie Lavaud, Russian Alina Pekova, Turk Tunc Findik, Mexican Viridiana Alvarez, French Francois Amilano, and French Ulysse Francois.
The Pakistani climbers included Yousuf Ali and Imtiaz Ali Sadpara, apart from Sajid Sadpara.
This is Sajid's seventh eight-thousand-meter peak and fourth in Pakistan after scaling the 'Savage Mountain' K2, Broad Peak and Gasherbrum. Earlier this year, he summitted the tallest mountain in the world, Mount Everest, without the use of supplemental oxygen, just a month after summitting the world's 10th tallest peak, Annapurna, in Nepal in a similar manner.
Last September, he had summitted the world's eighth highest peak, the 8,163-meter-tall Mount Manaslu, without supplemental oxygen.
He was part of the expedition on K2, which ended in the tragic deaths of his father, the legendary climber Ali Sadpara, Icelander John Snorri and Chilean Juan Pablo Mohr. Sajid was sent down by his father, who struggled but failed against the mountain.
Sajid has expressed a desire to carry on his father's dream of becoming the first Pakistani to summit all 14 mountains taller than 8,000 meters without supplemental oxygen or assistance.
Monday's summit carries greater significance for Sajid because it was his father who had claimed the honour of becoming the first person in history to summit the Killer Mountain in winter.