Citadel Advisors.
The book · Q2 2026
| # | Ticker | Name | Shares | $ value | % port | Δ Q2 |
|---|---|---|---|---|---|---|
| 1 | SPY | STATE STR SPDR S&P 500 ETF T | 47.75M | $35.7B | 4.1% | +23% |
| 2 | QQQ | INVESCO QQQ TR | 35.63M | $26.2B | 3.0% | +23% |
| 3 | SPY | STATE STR SPDR S&P 500 ETF T | 31.13M | $23.3B | 2.7% | — |
| 4 | QQQ | INVESCO QQQ TR | 31.00M | $22.8B | 2.6% | — |
| 5 | MU | MICRON TECHNOLOGY INC | 19.23M | $22.2B | 2.5% | +8% |
| 6 | MU | MICRON TECHNOLOGY INC | 14.14M | $16.3B | 1.9% | — |
| 7 | TSLA | TESLA INC | 32.55M | $13.7B | 1.6% | −11% |
| 8 | IVV | ISHARES TR | 17.63M | $13.2B | 1.5% | +302% |
| 9 | NVDA | NVIDIA CORPORATION | 60.85M | $12.2B | 1.4% | −14% |
| 10 | SNDK | SANDISK CORP | 5.16M | $11.7B | 1.3% | +48% |
Where the money is
AC read
Citadel Advisors' 13F for Q2 2026, covering the period ending June 30, 2026, shows a fund running at $875.1 billion in reported assets across 16,127 positions, a scale that keeps concentration low by design: the Herfindahl index sits at 0.008 and the top ten holdings account for just 22.5% of the portfolio. As always with 13F data, this filing was due 45 days after quarter end and reflects positions as they stood roughly three to four months ago, not current exposure. The holdings list shows split entries for the same tickers, SPY appears twice at $35.7 billion and $23.3 billion, QQQ twice at $26.2 billion and $22.8 billion, and MU twice at $22.2 billion and $16.3 billion, a pattern consistent with positions held across different share classes, custodial accounts, or options-related structures rather than a single directional bet.
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