The Reserve Bank of India's recent decision to mandate a public listing for Tata Sons is seen as a significant advantage for Shapoor Mistry, the chairman of the Shapoorji Pallonji Group. Mistry, known for his reclusive nature, has long advocated for Tata Sons to go public. His group holds an 18.4% stake in Tata Sons, a shareholding valued at an estimated $20 billion if Tata Sons were to list at a valuation of $100 billion. The SP Group is facing substantial debt, estimated between $6.6 billion and $7.2 billion, and a public listing would provide crucial liquidity by allowing them to monetize their stake.

The RBI's directive came after it rejected Tata Sons' application to surrender its core investment company registration, a move that would have allowed it to remain private. This decision overrides the efforts of Noel Tata, chairman of Tata Trusts and Mistry's brother-in-law, who has consistently pushed to keep Tata Sons private. The central bank's stance reinforces its September 2022 classification of Tata Sons as an upper-layer non-banking financial company, requiring it to list by September 2025. Tata Sons' assets of $21 billion (₹1.75 trillion) far exceed the $12 billion (₹1 trillion) threshold for listing.

The IPO would be a major financial event, potentially dubbed the "mother of all IPOs," and analysts estimate Tata Sons' valuation could exceed $120 billion (₹10 lakh crore). For the SP Group, which has its entire 18.4% stake pledged as collateral against its borrowings, an IPO offers a viable exit strategy and a means to alleviate its debt burden. While the Tata Trusts, which own 66% of Tata Sons, aim to maintain control and a charitable ownership structure, the RBI's decision creates a direct path for the SP Group to achieve its long-sought liquidity through a market listing. This outcome empowers the SP Group to potentially exercise more influence in related-party transactions, especially since Tata Trusts cannot vote on certain resolutions.