Vanguard ($6.9T), BlackRock ($5.5T), and State Street ($3.4T) reported a combined $15.8 trillion in Q4 2025 13F holdings. This research article digs into the data behind the biggest ownership concentration story in markets.
The combined filing data
| Firm | 13F AUM | Positions | Top holding | Top weight |
|---|---|---|---|---|
| Vanguard | ~$6.9T | 4,000+ | AAPL | ~7% |
| BlackRock | ~$5.5T | 5,000+ | AAPL | ~6.5% |
| State Street | ~$3.4T | 3,000+ | AAPL | ~7% |
| Combined | $15.8T | ~12,000 unique | AAPL | — |
The overlap analysis
Top-10 overlap: near-complete
All three firms hold virtually identical top-10 lists:
- Apple (AAPL)
- Microsoft (MSFT)
- NVIDIA (NVDA)
- Amazon (AMZN)
- Alphabet (GOOGL)
- Meta (META)
- Berkshire Hathaway (BRK)
- Broadcom (AVGO)
- Eli Lilly (LLY)
- JPMorgan (JPM)
Overlap rate: 9-10 out of 10 names are identical across all three. The order varies slightly due to index composition differences.
Why the overlap exists
All three are primarily index fund managers tracking the same benchmarks (S&P 500, Total Stock Market, Russell indices). Their portfolios converge because the index dictates the holdings.
The overlap is arithmetic, not agreement.
What $15.8T means for each stock
For any S&P 500 company, the Big Three collectively own approximately 20-25% of outstanding shares:
| Company | Approx Big Three ownership | Implication |
|---|---|---|
| Apple | ~22% | Three firms own >1/5 of the world's most valuable company |
| Microsoft | ~21% | Same concentration across all mega-caps |
| NVIDIA | ~20% | Even the hottest AI stock is dominated by passive |
| Small-cap (Russell 2000 member) | ~15-18% | Lower but still significant |
The governance implication
With 20-25% ownership comes proxy voting power:
- The Big Three vote on every board election, every executive comp proposal, every shareholder resolution
- Their voting decisions effectively set corporate governance standards for public markets
- Three firms' proxy policies influence thousands of companies simultaneously
The $15.8T growth trajectory
| Year | Estimated Big Three combined 13F | Growth driver |
|---|---|---|
| 2015 | ~$6T | Pre-passive revolution |
| 2018 | ~$9T | Passive fund inflows accelerating |
| 2020 | ~$11T | Post-COVID market recovery |
| 2022 | ~$10T | Market decline |
| 2024 | ~$14T | AI-driven market appreciation |
| 2025 Q4 | ~$15.8T | Continued inflows + market gains |
The trajectory: roughly doubling every 5-7 years, driven by:
- Market appreciation (stocks go up)
- Net fund inflows (investors choosing passive over active)
- Fee compression (lower fees attract more assets)
What 13F analysts should take from this
1. The passive baseline is essential
With $15.8T in passive holdings, any 13F analysis must start by establishing what passive owns. Active manager signals only matter relative to this baseline.
2. Active deviations are amplified
Because passive is 25% of ownership, the remaining 75% (active managers, individuals, insiders) determines marginal price movement. An active manager overweighting or underweighting vs. passive is a louder signal than ever.
3. New position initiation by passive = index event
When all three add the same name simultaneously, it's an index reconstitution — not a consensus investment view.
4. Weight differences between the three = product differences
Small weight variations reflect different index compositions (S&P 500 vs. Total Market vs. Russell), not different investment views.
5. The most informative 13F analysis ignores the Big Three
For stock-picking signals, filter OUT Vanguard, BlackRock, and State Street from your analysis. Focus on active managers whose positions represent deliberate choices.
Originally published at 13F Insight
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