Marketaxess Holdings Inc.

MKTX·NASDAQ·$131.23Share Price as of 11/2·$5BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/07/26 10-QQ1 ended 03/31/2605/07/26 10-KFY 202502/24/26 10-QQ3 ended 09/30/2511/07/25 10-QQ2 ended 06/30/2508/06/25

Disclosures

8-KCurrent report10/29/26 8-KCurrent report10/23/26 8-KCurrent report10/23/26 8-KCurrent report10/22/26 8-KCurrent report09/29/26

Prospectuses and Registrations

S-8Registration of securities for employees06/08/22 S-8Registration of securities for employees06/10/20 S-8Registration of securities for employees07/24/15 424B4Prospectus02/23/12 FWPFree writing prospectus02/23/12

Proxies

DEFA14AAdditional proxy materials09/29/26 DEFM14ADefinitive proxy (merger)09/18/26 PREM14APreliminary proxy (merger)09/04/26 DEFA14AAdditional proxy materials07/30/26 DEFA14AAdditional proxy materials07/30/26

Ownership

Form 4Insider transaction10/13/26 Form 4Insider transaction09/11/26 Form 4Insider transaction09/11/26 144Proposed sale of securities09/10/26 SC 13G/ABeneficial ownership (amended)08/14/26

Other

ARSAnnual report to shareholders04/29/26 ARSAnnual report to shareholders04/23/25 ARSAnnual report to shareholders04/24/24 ARSAnnual report to shareholders04/26/23 CT ORDERCT ORDER09/05/17