Form 121 - Do I need to submit Form 121 on CDSL portal whenever I am about to receive Dividend more than INR 10000?

There is a online form submission facility for Form 121 on CDSL Website. For TY2026-27, if one or more companies declared dividend and if dividend is greater than 10000 then do I need submit Form 121 online on CDSL portal (and if so how it distiguished for which company that declaration is made as there is no field for mentioning the payer)? Or only one time sumission is sufficient?

And if one time sufficient, then how can I fill the details in front of Point Number 10, 11, 11(a), 11(b) and 12? As these details will change from time to time as other companies may declare dividend at different point in time and one can not know these details beforehand.

In the past, when we need to submit 15G, I was submitting 15G separately to a particular company whenever that company declares dividend. How this works in the era of New Income Tax Rules, 2025? And especially in case of centrallized Form 121 submission through Depositories like CDSL?

Anybody who has any insight into this, kindly try to answer this (if possible cite sources/references).

@Quicko any idea ?