In comparison, 642 investor complaints were pending against 29 listed companies as on July 31, according to Sebi's Online Complaints Redress System (SCORES).
As on August 31, 541 complaints were pending for a period of more than 60 days against 21 firms, including Oil & Natural Gas Corporation, Malanpur Steel and Rolex Pharmaceuticals Ltd.
As per Securities and Exchange Board of India directive, listed firms are required to resolve investor complaints within a month of receiving them failing which they would be liable for penal action.
Of the total 541 investor complaints pending against 21 companies at August-end, the maximum number of complaints (141) were pending against Malanpur Steel.
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There were 104 investor grievances against ONGC, 21 against Rolex Pharmaceuticals and 20 complaints each against Jupiter Bioscience and Midfield Industries.
Acropetal Technologies Ltd and Modern Cement Ltd had 19 grievances each pending against them, while Steel Exchange India had only 18 such complaints.
The mutual funds included -- Reliance Mutual Fund (16) and SBI Mutual Fund (12).
As many as 26 investor grievances were pending against Karvy Computershare.
Sebi online complaint redressal system, SCORES, lists all entities functioning in the capital market, including listed companies, stock exchanges, merchant bankers and mutual funds.
SCORES, launched in June 2011, provides a centralised database of all complaints, online movement of complaints to the concerned listed companies, online upload of Action Taken Reports (ATRs) by the concerned companies.