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Net investment tells you what FPIs did in a given period β bought or sold, and by how much. A large negative net in a sector signals active selling pressure, while a positive net shows fresh conviction. But net alone can mislead: a sector may show outflow simply because it ran up too fast, not because the long-term story changed.
Assets Under Custody is the total market value of all FPI holdings in a sector at a point in time. Even during a period of net selling, if AUC rises, it means market appreciation is larger than the outflow β FPIs still hold significant wealth there. Conversely, falling AUC alongside net outflow is a much stronger bearish signal.
The real insight comes from the combination. Four scenarios matter most:
NSDL publishes data twice a month. Tracking both the mid-month and month-end snapshots gives you finer resolution β you can catch a trend reversal within the same month, rather than waiting for the next monthly report. The consolidated view here is designed exactly for that.