Noel Tata, Shapoorji Pallonji discuss share swap for Tata Sons stake sale

•Noel Tata's representatives discuss share swap with Shapoorji Pallonji Group for Tata Sons stake sale.
•Proposal involves exchanging listed Tata entities' shares for SP Group's 18.4% stake in Tata Sons.
•Two other options: direct buyout by Tata Sons or sale to external investor, preferably global.