Insider at

04

Insider transactions

05
0 buys (P) 0 sells (S) Net: $0 + 12 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

No open-market trades on record; showing all filings.

DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
July 29, 2011 MKTX A 2,870 · · 28,696 Direct +11.11% Acquired (price as of 2026-10-02)
July 30, 2010 MKTX A 4,923 · · 25,826 Direct +23.55% Acquired (price as of 2026-10-02)
July 30, 2009 MKTX A 4,178 · · 20,903 Direct +24.98% Acquired (price as of 2026-10-02)
July 30, 2009 MKTX M 3,187 · · 3,187 Direct · Acquired (price as of 2026-10-02)
Aug. 1, 2008 MKTX A 4,225 · · 4,225 Direct · Acquired (price as of 2026-10-02)
Aug. 1, 2008 MKTX A 4,225 · · 16,725 Direct +33.80% Acquired (price as of 2026-10-02)
Aug. 3, 2007 MKTX M 2,500 · · 2,500 Direct · Acquired (price as of 2026-10-02)
Aug. 3, 2007 MKTX A 2,500 · · 12,500 Direct +25.00% Acquired (price as of 2026-10-02)
Aug. 4, 2006 MKTX M 5,000 · · 5,000 Direct · Acquired (price as of 2026-10-02)
Aug. 4, 2006 MKTX A 5,000 · · 10,000 Direct +100.00% Acquired (price as of 2026-10-02)
Aug. 15, 2005 MKTX M 5,000 $10.04 $50,200 5,000 Direct · Acquired 1534.9% (price as of 2026-10-02)
Aug. 15, 2005 MKTX A 5,000 · · 5,000 Direct · Acquired (price as of 2026-10-02)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.

06
DateTickerSecurityUnderlying Exercise priceExpirationSharesA/D
July 30, 2009 MKTX Employee Stock Option (right to buy) Common Stock (3,187) $10.77 July 30, 2019 3,187 Acquired
Aug. 1, 2008 MKTX Non-Qualified Stock Option (right to buy) Common Stock (4,225) $9.72 Aug. 1, 2018 4,225 Acquired
Aug. 3, 2007 MKTX Employee Stock Option (right to buy) Common Stock (2,500) $16.99 Aug. 3, 2017 2,500 Acquired
Aug. 4, 2006 MKTX Employee Stock Option (right to buy) Common Stock (5,000) $9.30 Aug. 4, 2016 5,000 Acquired
Aug. 15, 2005 MKTX Employee Stock Option (right to buy) Common Stock (5,000) $10.04 Aug. 15, 2015 5,000 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 3 holdings

07

Securities held when first becoming an insider, per SEC Form 3.

DateTickerSecuritySharesOwnership
Nov. 19, 2004 MKTX Stock Option (right to buy)→ Common Stock, par value $0.003 per share (8,334) 8,334 Direct
Nov. 19, 2004 MKTX Stock Option (right to buy)→ Common Stock, par value $0.003 per share (10,000) 10,000 Direct
Nov. 4, 2004 MKTX Stock Option (right to buy)→ Common Stock, par value $0.003 per share (8,334) 8,334 Direct