The funds houses have also been asked by AMFI to "desist from entering into undesirable trades/transactions which are not in conformity with regulation".
The issue relates to a year-end phenomenon of large redemptions and re-entry by the same investors in the first week of April.
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This year the industry estimates March-end pressure of redemption of the order of Rs 60,000-80,000 crore mainly on account of large investments being pulled out by banks.
To ring-fence their assets under management (AUM) from such redemption pressure, some mutual funds tend to park their assets with large investors to meet their redemptions and buy them back in April, sources said.
When contacted, AMFI Chairman Sundeep Sikka said :"we strongly feel that any such practices, if prevalent, should be stopped immediately".
"AMFI has issued best practice circular to all AMCs that require any such outliers deal (variations in trades) to be placed before the respective trustee broads. We believe that trustees will ensure strict compliance," he added.
Concerned over this phenomenon that involves certain "undesirable" trades and transactions to inflate the AUMs, Sebi earlier this month sought clarification from AMFI (Association of Mutual Funds in India) on whether MFs were reaching out to cash-rich entities towards fiscal close to tide over redemption pressure with the help of intermediaries.
Replying to Sebi queries, the AMFI has now informed the regulator that it was "very difficult to assess if such transactions do happen or the size of such deals".
The industry body, which also functions as a front line regulator, further said that this "parking" phenomenon leads to funds buying assets at yields higher than the then prevailing yields in April.
"In order to desist funds from such trades, AMFI has requested all Asset Management Companies to send, on a daily basis, their entire trade data, such as secondary market trades, primary market trades and inter-scheme trades to (rating agencies) Crisil/ICRA.
"These agencies internally have also been requested by AMFI to highlight individual Outlier Trades, if any, to individual AMCs on a weekly basis.
"In this connection, AMFI has also sent a Best Practice Circular to all AMCs requesting them to present Outlier Trades (variation in trade figures), if any, to their respective Boards as per the data provided by Crisil/ICRA," AMFI CEO H N Sinor said in a communication to Sebi.
Consequently, AMFI has again written to all the fund houses about concerns raised by Sebi on this issue.