Aug 28 (Reuters) - Shares of Spanish solar panel company EiDF Solar plunged 70% on Monday, wiping 1.2 billion euros ($1.3 billion) off its market capitalisation, as trading in the stock resumed after a four-month suspension.

Market regulator CNMV suspended trading of EiDF shares in April after auditor PwC failed to sign off the company's 2022 financial report on time.

CNMV announced last Thursday that it would lift the suspension after EiDF restated its 2022 accounts in mid-August.

Shares in EiDF, which installs solar panels and develops solar farms, closed at 8.93 euros on Monday.

Before the suspension in April, the share price was 29.7 euros and the company was valued at 1.72 billion euros, more than Spanish solar panel maker Solaria.

Although CNMV allowed the shares to be traded again from Monday, the regulator warned that the information released earlier this month by EiDF, after an analysis by accounting firm Deloitte, was "not complete" and had "very relevant omissions".

"Deloitte's forensic report includes an account of facts and evidence of great significance for EiDF's shareholders... such as the possible falsification of documents by the company," CNMV said last Thursday.

EiDF said in a statement on Thursday that it would not release the full summary of Deloitte's report - as requested by CNMV - since the company considers it is "free" to decide how to manage its communications.

"There is nothing in our publication that is not contained in the (Deloitte) report or that deviates from its content," EiDF added.

The Deloitte report also showed that EiDF President Fernando Romero, who is also the company's main shareholder, "was involved first-hand in practically all of the company's decisions", according to the stock regulator.

The group said earlier in August that it would hire a new chief executive within the next six months to meet the auditor's requirements.

Romero owns more than 72% of EiDF, according to Refinitiv data.

In 2022, EiDF swung into the red with a 2.7 million euro annual loss, against a 1.1 million euro profit in the previous year. ($1 = 0.9252 euros) (Reporting by Matteo Allievi, editing by Inti Landauro, David Latona and Susan Fenton)