Pita maintains, however, that iTV's loss of its concession means it cannot be considered a mass media organisation.
"I am very confident that I am not unfit to run for office and to be a candidate for prime minister," he said, referring to candidate qualifications.
Pita, 42, has said the shares were part of his late father's estate, which he has declared to the anti-graft agency.
The election commission's chairman at the weekend said the complaints were being examined and further evidence was being gathered.
Pita has formed an alliance with seven other parties but faces an uphill battle to woo members of an unelected, conservative-leaning Senate to back him in a legislative vote on a prime minister, which is expected by August.
Persons:
Pita, Pita Limjaroenrat, Thanathorn Juangroongruangkit, Chayut Setboonsarng, Martin Petty
Organizations:
iTV, ITV Public Company, Constitutional, U.S, Thomson
Locations:
BANGKOK