MKTX: Marketaxess Holdings Inc insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 1 sales totaling $16K in the last 180 days.
Insider sales
| Trade date | Insider | Role | Value | 10b5-1 plan |
|---|---|---|---|---|
| 2026-10-12 | Pintoff Scott | Officer | $16K | yes |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | 13G amendment | North Reef Capital Management LP | 9.55% | SEC | |
| 2026-08-13 | 13G amendment | AQR Capital Management, LLC | 5.59% | SEC | |
| 2026-08-06 | 13G amendment | PRIMECAP MANAGEMENT CO/CA/ | 9.86% | SEC |
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