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In a statement confirming the delay, a spokesperson for Pearson apologised "unreservedly" for the disruption, and thanked its markers who had been affected by the technical problems.
One marker, who spoke to the BBC via Your Voice in June and asked not to be named, said internal deadlines had consistently been pushed back.
She said the technical issues meant she had stayed up until 01:00 some nights "just trying to keep up".
She said she continued marking because students and parents were expecting to get their results in July and she did not want to see them disappointed.
She also raised concerns about the accuracy of the marking process.
"I marked one question that I remembered I had marked before, but the system had assigned the mark I gave to a different question," she said.
"I reported this, but it raises concerns about whether errors like this could impact final results."
Pearson said it had a plan to complete the remaining work, with teams "working around the clock to deliver the remaining pupil data".
"Our priority is ensuring that every school and pupil receive complete and accurate results," a spokesperson said.
Whiteman said it was "not the first time schools have faced delays", adding that "once the current issues have been addressed it is vital that they are properly investigated to ensure it is the last".
"Pupils, parents and schools have been badly let down," he said.
"Given the fiasco around the marking and return of results, we once again question the whole purpose of these outdated tests."
Additional reporting by Vanessa Clarke
