Kotak Mahindra Bank has received approval from the Reserve Bank of India to acquire up to 9.99% stakes in both AU Small Finance Bank and Federal Bank, a move that opens the door to significant cross-holdings among private lenders.

The 9.99% threshold is not arbitrary. Under RBI rules, any investor acquiring 5% or more in a bank must seek prior regulatory approval, and holdings above 10% trigger a much stricter review involving fit-and-proper assessments and potential restrictions on voting rights. By stopping at 9.99%, Kotak stays just below that higher bar, giving it meaningful economic exposure without the compliance burden that comes with a larger stake.

What This Means for AU Small Finance and Federal Bank

For AU Small Finance Bank, the news gave the stock a lift — shares were trading at ₹1,034.60 on the BSE, up roughly 1% from the previous close. A Kotak stake at that level would represent a notable vote of confidence in AU's growth trajectory as it scales its lending book and works toward a universal banking licence.

Federal Bank, a Kerala-based mid-sized private lender, would similarly benefit from the signal that a top-tier bank sees value in its franchise. Neither acquisition has been completed yet; RBI approval clears the regulatory path, but Kotak still needs to execute the actual share purchases.

Why Kotak Is Doing This

Sub-10% stakes in other banks are classified as investments rather than strategic control, which limits disclosure and governance obligations. For Kotak, this is likely a financial investment play — parking capital in well-run smaller banks that may grow faster than the broader sector. It also positions Kotak to deepen relationships with these institutions without triggering merger-related scrutiny.

The RBI's willingness to approve these stakes signals comfort with the ownership structure. Cross-holdings between private banks are uncommon in India, so this approval sets a precedent worth watching as consolidation conversations in Indian banking quietly continue.

Investors should track whether Kotak actually builds these positions in the open market or via block deals, and at what price. The size of the final stake and the pace of acquisition will say a lot about how strategic — versus opportunistic — this move really is.