In a major setback for Tata Sons, the Reserve Bank of India (RBI) has rejected its application to surrender its core investment company registration, dismissing its attempt to avoid a mandatory stock market listing, a source said on Saturday.

The decision was conveyed to the company through a letter addressed to the company secretary and chief financial officer. Tata Sons had filed an application in March 2024 seeking to deregister as a non-banking financial company (NBFC).

However, there has been no official statement from either party yet.

The rejection means Tata Sons will remain classified as an upper-layer NBFC, a category subject to enhanced regulatory requirements, including mandatory listing on the stock market.

The RBI first placed Tata Sons in the upper-layer category in 2022, triggering a three-year deadline to list that originally expired on September 30, 2025.

In an effort to exit the framework before the deadline, Tata Sons repaid more than Rs 21,000 crore of debt in 2024 and applied to surrender its registration. The move would have allowed it to operate as an unregulated holding company and remain privately held.

The application remained pending through 2025, while Tata Sons continued to be included in successive lists of upper-layer NBFCs.

The relinquishment route became harder to avoid this year after the RBI revised its norms, effective from June 2026. Under the new framework, any NBFC with assets of Rs 1 lakh crore or more is automatically classified as an upper-layer NBFC.

Tata Sons’ standalone assets stood at more than Rs 2 lakh crore as of March 2026, well above the threshold set under the new framework. The RBI subsequently retained Tata Sons in the upper-layer category in August.

Tata Sons was the only unlisted private entity among the 17 companies on the upper-layer list, which also includes government-owned NBFCs such as REC, PFC, National Corporation and Indian Railway Finance Corporation.

Government-owned entities are exempt from the mandatory listing requirement, while Tata Sons does not qualify for the exemption.

The RBI’s move also removes the key regulatory route Tata Sons had pursued to remain private.

Tata Sons is the apex holding company of the Tata Group and holds substantial equity in Tata companies across IT, automotive, steel, consumer products, aviation, hospitality and financial services.

A listing would represent a major change for the holding company and could bring significant scrutiny of its finances, investments and capital allocation.

The RBI’s rejection now puts Tata Sons on the path towards a stock market listing.