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Jim Simons's MarketAxess Holdings Inc. (MKTX) position

Yes: as of Q1 2026, Jim Simons holds 167K shares of MKTX worth $28M (0.0% of the disclosed portfolio). Held since at least Q1 2021; that opening coverage snapshot is not counted as a purchase.
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Current value
$28M
Shares held
167K
% of portfolio
0.0%
Est. average buy price (i)
$214.47
Quarter-end price
$164.98

Estimated trade prices

Average price in quarters with purchases
$228.93
Average prices in quarters with sales
  • Q1 2026: $175.20 (9K shares sold)
  • Q4 2025: $170.65 (69K shares sold)
  • Q1 2025: $210.05 (98K shares sold)
  • Q2 2023: $298.32 (3K shares sold)
  • Q1 2023: $354.10 (3K shares sold)
  • Q4 2022: $257.38 (70K shares sold)
  • Q1 2022: $362.45 (66K shares sold)
  • Q4 2021: $394.45 (94K shares sold)
  • Q3 2021: $458.85 (119K shares sold)
  • Q2 2021: $476.00 (149K shares sold)

MKTX price vs Simons's position

1Y 3Y 5Y MAX
Dates
$100$200$400$60020222023202420252026Sold 119K shares (39.0%) · Q3 2021. Average closing price $458.85 · Price range $417.22–$492.13119KsharessoldSold 94K shares (50.5%) · Q4 2021. Average closing price $394.45 · Price range $343.73–$431.5394KsharessoldSold 66K shares (71.7%) · Q1 2022. Average closing price $362.45 · Price range $330.12–$396.8366KsharessoldAdded 34K shares (129.0%) · Q2 2022. Average closing price $273.48 · Price range $250.18–$345.5134KsharespurchasedAdded 77K shares (129.7%) · Q3 2022. Average closing price $256.63 · Price range $219.06–$277.5277KsharespurchasedSold 70K shares (50.9%) · Q4 2022. Average closing price $257.38 · Price range $228.87–$289.4470KsharessoldSold 3K shares (4.6%) · Q1 2023. Average closing price $354.10 · Price range $284.87–$391.293KsharessoldSold 3K shares (4.9%) · Q2 2023. Average closing price $298.32 · Price range $257.89–$392.293KsharessoldAdded 60K shares (99.2%) · Q3 2023. Average closing price $242.37 · Price range $201.78–$274.3860KsharespurchasedNew position of 5K shares · Q1 2024. Average closing price $236.24 · Price range $207.77–$286.455KsharespurchasedAdded 159K shares (over 1,000%) · Q2 2024. Average closing price $206.20 · Price range $194.05–$226.50159KsharespurchasedAdded 23K shares (14.0%) · Q3 2024. Average closing price $234.37 · Price range $193.39–$260.9523KsharespurchasedAdded 40K shares (21.5%) · Q4 2024. Average closing price $263.23 · Price range $225.30–$293.6140KsharespurchasedSold 98K shares (43.2%) · Q1 2025. Average closing price $210.05 · Price range $189.81–$226.4798KsharessoldAdded 61K shares (47.2%) · Q2 2025. Average closing price $219.79 · Price range $203.19–$231.0961KsharespurchasedAdded 54K shares (28.5%) · Q3 2025. Average closing price $195.81 · Price range $174.25–$223.1154KsharespurchasedSold 69K shares (28.2%) · Q4 2025. Average closing price $170.65 · Price range $158.85–$183.8569KsharessoldSold 9K shares (5.1%) · Q1 2026. Average closing price $175.20 · Price range $160.28–$193.619Ksharessold← Earlier —1 sell
Average closing price · filing quarter
$175.20
Price range · filing quarter
$160.28 – $193.61
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −9K −$1.6M −5.1% 167K May 14, 2026
Q4 2025 Reduced −69K −$12M −28.2% 176K Feb 12, 2026
Q3 2025 Added +54K +$11M +28.5% 245K Nov 13, 2025
Q2 2025 Added +61K +$13M +47.2% 191K Aug 13, 2025
Q1 2025 Reduced −98K −$21M −43.2% 130K May 14, 2025
Q4 2024 Added +40K +$11M +21.5% 228K Feb 13, 2025
Q3 2024 Added +23K +$5.4M +14.0% 188K Nov 13, 2024
Q2 2024 Added +159K +$33M +3,066.1% 165K Aug 9, 2024
Q1 2024 New +5K +$1.2M – 5K May 13, 2024
Q3 2023 Added +60K +$15M +99.2% 121K Nov 14, 2023
Q2 2023 Reduced −3K −$944K −4.9% 61K Aug 11, 2023
Q1 2023 Reduced −3K −$1.1M −4.6% 64K May 12, 2023
Q4 2022 Reduced −70K −$18M −50.9% 67K Feb 13, 2023
Q3 2022 Added +77K +$20M +129.7% 137K Nov 14, 2022
Q2 2022 Added +34K +$9.2M +129.0% 59K Aug 12, 2022
Q1 2022 Reduced −66K −$24M −71.7% 26K May 13, 2022
Q4 2021 Reduced −94K −$37M −50.5% 92K Feb 11, 2022
Q3 2021 Reduced −119K −$54M −39.0% 185K Nov 12, 2021
Q2 2021 Reduced −149K −$71M −32.9% 304K Aug 13, 2021
Q1 2021 First covered – – – 453K May 13, 2021
Data through Q1 2026 · filed May 14, 2026
20 grouped rows from 20 quarters

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Common questions

Does Jim Simons own MKTX?

Yes. As of Q1 2026, Jim Simons disclosed 167K shares of MKTX, worth $28M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Jim Simons buy MKTX?

Jim Simons held MKTX since at least Q1 2021, when this filing coverage begins; the opening snapshot is not a disclosed purchase. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Jim Simons sell MKTX?

The quarter-by-quarter table above shows each sale and reduction Jim Simons disclosed in MKTX. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of MKTX does Jim Simons own?

Jim Simons disclosed 167K shares of MKTX as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Jim Simons pay for MKTX?

Jim Simons's estimated average buy price for MKTX is $214.47, from quarter-average prices weighted by the shares added each quarter. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.