Institutional vs Retail Investors: How to Tell Them Apart

The same "buy" means something very different when an institution does it versus retail. Order-flow data separates the two.

Who is "institutional" vs "retail"?

Institutions = funds, desks, market makers: large orders, planned. Retail = individuals: small orders, emotional. Data often splits them by order size: large + block orders ≈ institutional; medium + small ≈ retail.

Why it matters

• Institutional-led — usually more planned and sustained.
• Retail-led — often chasing; noisier.
• The same "net inflow" means different things depending on who drives it.

How to tell from data

• Institutional vs retail split — the net of large vs small orders.
• Purity — the higher the institutional share of net flow, the "cleaner" the signal.
• Combine with the dark pool — institutions often trade size off-exchange.

Common mistakes

• Assuming "net inflow" means institutions are buying.
• Ignoring order size; mistaking a big small-order total for institutions.
• Judging from a single day.