As the Central Bureau of Investigation (CBI) is preparing to file the second supplementary charge sheet in the 2G spectrum scam, the probe agency will file a status report in the case in the Supreme Court on Wednesday.

CBI sources said some more ''big people' including top bosses of different firms whose names have figured in the ongoing probe are likely to be named in the charge sheet.

The probe agency was to file the charge sheet by the first week of July but it has been delayed due to several reasons.

'The CBI is analysing the documents received from Mauritius in relation with more than a dozen companies.

The agency is also seeking clarification from the Ministry of Corporate Affairs on some issues,' the sources said.

The second supplementary charge sheet is now likely to be filed by July end, they added.

The supplementary charge sheet is likely to focus on the links between Essar Group and Loop Telecom. The CBI sources said the probe agency was investigating whether Loop was a front for Essar in getting spectrum licences.

The CBI had on April 2 filed the first charge sheet in the scam while the supplementary charge sheet was filed on April 25.

Former Telecom Minister A Raja, DMK MP K Kanimozhi and several corporate honchos are lodged in the Asia's largest Tihar Jail in connection with the scam.

The CBI has pegged the loss to the exchequer in the allocation of spectrum by then Communication Minister Andimuthu Raja at Rs.35,000 crore. Raja had allegedly committed several irregularities in the allocation of spectrum to telecom companies in 2008 to favour certain firms.

The Comptroller and Auditor General (CAG) report had pegged the losses at Rs 1.76 lakh crore.

The CBI had also quizzed several business leaders in connection with the spectrum case.