SIMPLEX TRADING LLC
Q3 2026 Form 13-F
CHICAGO, ILLINOIS
CIK 0001488542
· Institutional investment manager
$183.8B Reported Value Total
Reported value
$183.8B
Quarter over quarter
-1.7%
Holdings
2,705
Top-10 concentration
50.7%
Key People
Named on the latest Form 13-F filing — not necessarily an owner
Dennis Kerlin
Chief Compliance Officer
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Q3 2026 13F record
Q3 2026 13F filing summary
| Period of report | September 30, 2026 |
|---|---|
| Filed | November 04, 2026 |
| Form | 13F-HR |
| Reported value | $183.8B |
| Positions | 2,705 |
| Change in reported value | +7.8% |
| New positions | 929 |
| Exited positions | 957 |
| Position turnover | 51.5% |
| Top-10 concentration | 50.7% |
13F filings by quarter
| Quarter | Positions | Value |
|---|---|---|
|
Q3 2026 13F
Filed Nov 4, 2026
|
2,705 | $183.8B |
|
Q2 2026 13F
Filed Aug 12, 2026
|
2,733 | $170.6B |
|
Q1 2026 13F
Filed May 14, 2026
|
2,613 | $149.1B |
|
Q4 2025 13F
Filed Feb 11, 2026
|
2,448 | $177.4B |
|
Q3 2025 13F
Filed Nov 12, 2025
|
2,421 | $194.9B |
|
Q2 2025 13F
Filed Aug 5, 2025
|
2,203 | $174.6B |
|
Q1 2025 13F
Filed May 12, 2025
|
2,153 | $156.2B |
|
Q4 2024 13F
Filed Feb 11, 2025
|
2,213 | $178.6B |
|
Q3 2024 13F
Filed Nov 8, 2024
|
2,053 | $170.4B |
|
Q2 2024 13F
Filed Jul 25, 2024
|
2,161 | $161.9B |
|
Q1 2024 13F
Filed Apr 25, 2024
|
2,165 | $173.1B |
|
Q4 2023 13F
Filed Feb 2, 2024
|
2,187 | $156.4B |
|
Q3 2023 13F
Filed Nov 1, 2023
|
2,030 | $127.1B |
|
Q2 2023 13F
Filed Aug 4, 2023
|
2,141 | $121.6B |
|
Q1 2023 13F
Filed Apr 27, 2023
|
2,088 | $113.8B |
|
Q4 2022 13F
Filed Feb 2, 2023
|
2,246 | $91.9B |
|
Q3 2022 13F
Filed Nov 4, 2022
|
2,448 | $88.5B |
|
Q2 2022 13F
Filed Aug 3, 2022
|
2,383 | $94.1B |
|
Q1 2022 13F
Filed May 2, 2022
|
2,667 | $109.4B |
|
Q4 2021 13F
Filed Feb 4, 2022
|
2,810 | $99.0B |
28 earlier quarters on file — choose one from the quarter menu above.
Top 20 holdings · Q3 2026
| # | Holding | Reported value | % of portfolio |
|---|---|---|---|
| 1 | SPY P STATE STR SPDR S&P 500 ETF T | $29.2B | 15.91% |
| 2 | SPY C STATE STR SPDR S&P 500 ETF T | $17.4B | 9.49% |
| 3 | QQQ P INVESCO QQQ TR | $12.1B | 6.57% |
| 4 | QQQ C INVESCO QQQ TR | $8.9B | 4.82% |
| 5 | NYC P ISHARES TR | $7.7B | 4.19% |
| 6 | NYC C ISHARES TR | $4.5B | 2.44% |
| 7 | NVDA P NVIDIA CORPORATION | $3.6B | 1.98% |
| 8 | NVDA C NVIDIA CORPORATION | $3.6B | 1.95% |
| 9 | META C META PLATFORMS INC | $3.4B | 1.82% |
| 10 | MU P MICRON TECHNOLOGY INC | $2.8B | 1.5% |
| 11 | MU C MICRON TECHNOLOGY INC | $2.7B | 1.47% |
| 12 | TSLA C TESLA INC | $2.6B | 1.42% |
| 13 | GOOG C ALPHABET INC | $2.5B | 1.36% |
| 14 | AAPL C APPLE INC | $2.4B | 1.31% |
| 15 | AMD P ADVANCED MICRO DEVICES INC | $2.4B | 1.31% |
| 16 | GLD C SPDR GOLD TR | $2.2B | 1.2% |
| 17 | AMD C ADVANCED MICRO DEVICES INC | $2.0B | 1.11% |
| 18 | AAPL P APPLE INC | $2.0B | 1.07% |
| 19 | TSLA P TESLA INC | $2.0B | 1.06% |
| 20 | MSFT C MICROSOFT CORP | $1.7B | 0.92% |
Values as reported on the Q3 2026 Form 13F. Every position is in the holdings table below.