Financial headlines use these three abbreviations as if they were parallel categories. They are not. One is a live registration, one is a retired registration that the market still says out of habit, and one is a bucket the exchanges use for reporting.
What each one actually is
A foreign portfolio investor, or FPI, holds the current registration. SEBI’s (Foreign Portfolio Investors) Regulations, 2014 folded the older foreign institutional investor registration, its sub-accounts, and the qualified foreign investor route into a single FPI registration. Those were replaced by the SEBI (Foreign Portfolio Investors) Regulations, 2019, which define two categories. Category I covers government and government-related investors, pension and university funds, and appropriately regulated entities such as insurers, banks, asset managers and broker dealers. Category II covers the rest. SEBI’s own public register is titled FPIs / Deemed FPIs (Erstwhile FIIs/QFIs), which is as direct a statement of the succession as you will get.
A foreign institutional investor, or FII, held the registration that FPI replaced. When a market report today says “FII selling”, it almost always means the exchange-published provisional net figure for foreign portfolio investors in the cash segment.
A domestic institutional investor, or DII, has no SEBI registration of that name. It is a reporting aggregate covering domestic mutual funds, insurance companies, banks, pension funds and domestic financial institutions.
| Label | Status | Typical published series |
|---|---|---|
| FPI | Current SEBI registration, Category I and II | Daily provisional cash-market net, fortnightly and sector-level assets under custody |
| FII | Retired registration, still used colloquially | Whatever the speaker means by FPI |
| DII | Exchange reporting bucket, not a registration | Daily provisional cash-market net |
Where the numbers come from
Exchanges publish daily provisional FPI and DII cash-market activity after the close. NSDL runs the FPI Monitor, which carries assets under custody by sector and fortnightly flow detail at a finer grain than the daily headline.
Caveats
Provisional is provisional. The same-day figure is revised, and the revision is not always small.
Net flow is not ownership change. A large part of foreign participation arrives through primary issues, offers for sale and block deals, and the cash-market net does not decompose into those routes.
The derivatives book is separate. A flat cash-market net can coexist with a large change in index futures positioning, so reading the cash figure alone understates the exposure.
DII buying is partly mechanical. Systematic investment plans deliver a monthly inflow that fund managers must deploy regardless of view. AMFI reported a record SIP inflow of ₹29,361 crore in September 2025 across 9.25 crore active SIP accounts (AMFI data via Q7 Trading), which is a standing bid rather than an expression of conviction.
Daily flow is a description, not a signal. Both series are published after the market has already moved, so any strategy built on them is acting on the following session at best.