Simplex Trading, LLC
- SEC CIK
- 0001488542
- Latest filing
- Aug 12, 2026
MKTX holding history
Marketaxess Holdings Inc in every 13F filed by Simplex Trading, LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
MKTX overviewAll 13F holders of MKTXFull Q2 2026 holdings
- Shares (Q2 2026)
- 2,336
- Value
- $265.1K
- % of portfolio
- <0.1%
- Quarters held
- 14
- Since Q1 2021
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q2 2026 | 2,336 | $265.1K | <0.1% | +2,336 | New | Holders |
| Q1 2026 | 0 | $0 | 0.0% | −259−100.0% | Sold out | Holders |
| Q4 2025 | 259 | $46.9K | <0.1% | −2,030−88.7% | Reduced | Holders |
| Q3 2025 | 2,289 | $398.0K | <0.1% | −230−9.1% | Reduced | Holders |
| Q2 2025 | 2,519 | $562.0K | <0.1% | −4,424−63.7% | Reduced | Holders |
| Q1 2025 | 6,943 | $1.50M | 0.1% | +6,246+896.1% | Added | Holders |
| Q4 2024 | 697 | $157.0K | <0.1% | +697 | New | Holders |
| Q3 2024 | 0 | $0 | 0.0% | −3,816−100.0% | Sold out | Holders |
| Q2 2024 | 3,816 | $765.0K | <0.1% | +3,816 | New | Holders |
| Q1 2024 | 0 | $0 | 0.0% | −764−100.0% | Sold out | Holders |
| Q4 2023 | 764 | $223.0K | <0.1% | −1,708−69.1% | Reduced | Holders |
| Q3 2023 | 2,472 | $528.0K | <0.1% | +2,472 | New | Holders |
| Q4 2022 | 0 | $0 | 0.0% | −2,681−100.0% | Sold out | Holders |
| Q3 2022 | 2,681 | $596.0K | <0.1% | +2,681 | New | Holders |
| Q1 2022 | 0 | $0 | 0.0% | −37−100.0% | Sold out | Holders |
| Q4 2021 | 37 | $15.0K | <0.1% | −2,792−98.7% | Reduced | Holders |
| Q3 2021 | 2,829 | $1.31M | <0.1% | −100−3.4% | Reduced | Holders |
| Q2 2021 | 2,929 | $1.36M | <0.1% | +781+36.4% | Added | Holders |
| Q1 2021 | 2,148 | $1.07M | 0.1% | – | – | Holders |
Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.