In a TREPS transaction, the borrower, often a mutual fund, pledges government securities, such as Treasury Bills, with the lender (usually a bank or a financial institution) to borrow funds.

The lender provides the funds to the borrower, and in return, the borrower agrees to repurchase the pledged securities at an agreed-upon future date and price, including an interest component.

These transactions typically have short tenors, ranging from overnight to a few weeks, making them a valuable tool for managing temporary cash flow requirements.

Why do Mutual Funds Invest in TREPS?

There are many reasons for this. One is Liquidity Management : Mutual funds often face the challenge of maintaining sufficient liquidity to meet potential redemptions from investors. TREPS provide a convenient way to raise funds quickly by pledging their existing securities, ensuring a prompt processing of redemption requests.

The second benefit is Yield Enhancement : if the Mutual funds receive money during the need, they buy cheaply available shares which increases their yield. 

The third is Short-term Financing because there are instances when mutual funds require short-term financing to seize immediate investment opportunities or address temporary funding gaps. 

And at last, they do so because of the regulatory compliance as all the mutual funds must adhere to regulatory guidelines set by the Securities and Exchange Board of India (SEBI). Investing in TREPS allows them to manage their investments within these prescribed limits, ensuring compliance with regulatory requirements.