SPY
SPY's ownership breakdown tells an interesting story about who actually holds the world's most traded ETF.
The relatively modest 1.9% passive index classification may seem counterintuitive for an index ETF, but this reflects how behavioral tagging works in 13F analysis — many passive holders get categorized by their broader trading patterns rather than their stated mandate. Quality compounders at 5.4% and tactical macro at 4.3% round out the picture of a diverse, largely institutionally-driven holder base. The near-zero activist and deep value presence (0.3% and 0.1% respectively) makes complete sense — nobody's running a proxy fight against the S&P 500. The institutional pressure score of 0.00 and market regime score of 0.01 are about as neutral as it gets, indicating no strong directional signal from the current ownership composition or broader market structure. For SPY specifically, extreme neutrality is arguably the expected baseline. Worth noting: 13F filings are submitted 45 days after quarter-end, meaning ownership data can be 45 to 90 days stale by the time it's analyzed. For an instrument as liquid and constantly-traded as SPY, the composition likely shifts daily. None of this data reflects future positioning — it's a historical snapshot of where institutional money sat at a specific point in time.
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
§ 04 · FUNDAMENTALS · THE BOOKS
| P/E | — | P/S | — |
| EV/EBITDA | — | P/B | — |
| Revenue (TTM) | — | Rev YoY | — |
| Gross margin | — | Op margin | — |
| Net income | — | FCF | — |
| Cash | — | Debt | — |
| Dividend | — | Buybacks 1Y | — |
SPY's ownership breakdown tells an interesting story about who actually holds the world's most traded ETF. The largest slice — 52.8% — falls into the "unclassified" bucket, which likely reflects the sheer diversity of holders that don't fit neatly into behavioral categories, from pension funds to retail aggregators. What's more telling is that systematic quant strategies and dealer/bank desks together account for roughly 34% of tracked institutional ownership, suggesting SPY functions less as a conviction investment and more as a plumbing mechanism — a tool for hedging, rebalancing, and liquidity management rather than a long-term bet on the market.
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| Barclays PLC | 84.7M | 13.9% | — |
| Optiver Holding B.V. | 80.1M | 20.3% | −12% |
| 1832 Asset Management L.P. | 75.0M | 39.0% | −25% |
| JANE STREET GROUP, LLC | 64.8M | 6.7% | — |
| Optiver Holding B.V. | 62.1M | 15.7% | −1% |
| JANE STREET GROUP, LLC | 61.5M | 6.3% | — |
Top institutional owners for SPY as of the most recent 13F window (Dec 2025). 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.