Tata Chemicals shares surged on Thursday, driven by the RBI's new guidelines for upper-layer NBFCs, sparking hopes for a Tata Sons listing. Analysts suggest this could unlock significant value for Tata Chemicals, which holds a stake in the unlisted entity. The potential listing of Tata Sons, valued in the unlisted market, could boost Tata Chemicals' market capitalization substantially, marking a shift from its current book value reflection.