Defending the move, Sebi said it took the action after receiving the list of companies from the corporate affairs ministry.
Several other firms are expected to take similar recourse to challenge the market regulator's decision asking stock exchanges to restrict trading in 331 firms for being "suspected shell companies".
JKumar Infraprojects and Prakash Industries told the SAT that their businesses are legitimate and that they are not shell companies.
The Securities and Exchange Board of India (Sebi) told the tribunal that it got the information from the corporate affairs ministry and subsequently asked the exchanges to investigate and take action.
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The hearing at the tribunal has been adjourned till tomorrow.
Observing that Sebi received the list of companies on June 9 and the circular was issued on August 7, the SAT asked the regulator whether investigation was carried out in the intervening period.
The regulator is expected to give its reply tomorrow.
The term 'shell company' is not defined under the Companies Act but Corporate Affairs Minister Arun Jaitley had told the Lok Sabha recently that many such entities have been found to be indulging in large scale tax violations.
Many of those stocks also saw huge jump in their prices and volumes after demonetisation in November last year.
Last month, Prime Minister Narendra Modi had said 37,000 shell companies indulging in tax evasion had been detected and more than three lakh firms were under the scanner for suspicious dealings after demonetisation.
Sebi has asked the exchanges to restrict trading in shares of 331 "suspected shell companies", some of which have investments by several well-known domestic and foreign investors.
"We have filed an appeal before SAT. Our plea is to set aside the Sebi order. We are not a shell company and we have complied with all the rules and regulations and not evaded any tax," Parsvnath chairman Pradeep Jain said.
On Tuesday, many of the companies tagged annual reports and other financials along with their filings to press upon the exchanges that they are not shell companies and are in compliance with all regulations.
"We are shocked to find our company's name amongst the list of suspected shell companies as a result of which, our equity shares...Are being shifted to GSM VI on the stock exchanges.
Similarly, J Kumar Infraprojects had said it is not a shell company and suspicion of the regulator is uncalled for.
Prakash Industries had also said that directions issued by Sebi are "totally devoid of merit and uncalled for. Besides, there has never been a occasion when our company has indulged in any kind of malpractices in stock market".
In a communication sent to the BSE, the NSE and the Metropolitan Stock Exchange on Monday, Sebi had asked them to keep the 331 shares in stage six of the Graded Surveillance Mechanism (GSM) with immediate effect.
Apart from initiating a "process of verifying the credentials/fundamentals of such companies", the exchanges have also been asked to appoint an independent auditor to carry out audit of these entities. If necessary, even forensic audit could be ordered to verify their credentials and fundamentals.