SPY
SPY's ownership breakdown shows a market that does not fit neatly into categories.
The remaining categories are small. Tactical macro sits at 4.6%, quality compounder at 3.2%, passive index at just 1.2%, income defensive at 1.0%, deep value at 0.2% and activist at 0.1%. The low passive index figure is notable given SPY is itself an index product, and likely reflects how this classification counts share ownership by strategy type rather than fund mandate. Activist and deep value are effectively absent, which is expected for a broad market ETF that no single actor can meaningfully influence. Institutional pressure reads Neutral with a score of 0.00, and the market regime reads Neutral with a score of 0.06. Neither metric indicates directional positioning building up in either direction right now. This ownership data is a snapshot, and 13F filings that feed these breakdowns run 45 to 90 days old, so the dealer bank and quant concentrations shown here may have shifted since the reporting period. None of this is a signal about where SPY goes next. It is a picture of who held the ETF and how the market was positioned as of the data's reporting date, not a forecast. The dominance of unclassified and mechanical holders alongside a neutral pressure reading describes the past, not what happens from here.
Read the full note →§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| JANE STREET GROUP, LLC | 112.9M | 9.4% | +42% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 112.6M | 8.2% | +68% |
| Optiver Holding B.V. | 93.4M | n/a | +17% |
| Optiver Holding B.V. | 68.3M | n/a | +10% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 67.2M | 4.9% | n/a |
| JANE STREET GROUP, LLC | 65.7M | 5.5% | n/a |
Top institutional owners for SPY as of the most recent 13F reporting period (Q1 2026 · Period ended Mar 31). Δ Q/Q reflects share-count change vs. the prior filing — positive green means adding, negative red means trimming. Cross-reference with the ownership-mix bars below to see which strategy cohort is driving the flow.
§ 06 · WHO OWNS IT · BY STRATEGY
Ownership mix by behavioral cohort. Top bars indicate which style of capital dominates the float — passive indexing, quality compounders, dealer/bank, systematic quant, etc. Big quality-compounder share means concentrated active conviction; heavy passive share means flows are dictated by index rebalances, not fundamentals.
§ 07 · INSIDER ACTIVITY · LAST 180 DAYS
No Form 4 filings on record for SPY in the last 180 days.