Reliance Power, in a fresh letter to the Sebi dated February 11, also asked the markets regulator to declare all Edelweiss Group entities as not being "fit and proper" and impose a ban on each of them from the capital markets and related activities.
It also asked the regulator to investigate the sale of Reliance Power shares by Edelweiss Group on February 4-5.
When contacted, a Reliance Group spokesperson referred to an earlier statement in which boards of three listed companies of the group -- Reliance Power, Reliance Infra and Reliance Capital -- had approved and recommended "all appropriate legal steps" to protect shareholders' value.
"We will take all legal steps necessary to protect and enhance the value of our stakeholders, including pursuing the matter with an appropriate regulator," the spokesperson added.
There was no response to a query sent to Edelweiss Group. Last week, Edelweiss said it had granted credit facilities against pledge of shares to Reliance Group and it reached out numerous times to the group to address concerns on shortfall in margins and resultant fall in collateral valuation.
It said liquidation of collateral was necessitated after Reliance Group continued to breach contractual obligations, and did not reply to an offer for remediation.
The letter alleged that Edelweiss Group usurped powers vested in debenture trustee over pledged shares and violated legal, contractual and fiduciary obligation to realise fair value for pledged shares.
"The Edelweiss Group arbitrarily bypassed and flouted all documents processes for invoking of the pledge and enforcement of the security by the debenture trustee and instead illegally and in a pre-mediated manner themselves started dumping huge opportunities of Reliance Power shares and futures in the open market commencing from 9.57 am on February 4 and through the end of business hours on February 5," it added.
This illegal actions of Edelweiss Group brought down the share price of the company by 57 per cent in just two days.
Reliance Capital alleged that Edelweiss Group entities were indulged in illegal and market disruptive activities and violated the Sebi's PFTUP (Prohibition of Fraudulent and Unfair Trade Practices) norms.
The company's promoter are also seeking "restoration of status quo ante and punitive damages from Edelweiss Group".
Earlier, the company had written a letter to the Securities and Exchange Board of India (Sebi) on February 6 requesting it to investigate the matter and impose restrain on entities that pressed huge sale orders significantly below the prevailing market price and in-depth investigate the matter.
Similar complaints are expected to be filed by Reliance Capital and Reliance Infrastructure as well, sources said.
Meanwhile, the Sebi is looking into allegations and counter-allegations related to the sale of pledged shares of Reliance Group's three listed firms by two lenders, as per senior officials.