🕵️ Marketaxess Holdings Inc ($MKTX)
SEC insider & ownership activity, last 12 months · CIK 1278021 · every row links its SEC filing
Over the last 12 months insiders sold $701K with no open-market buying against it. Stephen P. Casper sold $299K in discretionary trades (Sep). Blackrock, Inc. added 9.9% → 10.9%; Primecap Management CO/CA/ added 6.0% → 8.5%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 3 sellers, $701K (10 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Stephen P. Casper | 0 | – | 1 | $299K | Sep 8, 2025 |
| Kevin M. McPherson | 0 | – | 1 | $277K | Sep 12, 2025 |
| Pintoff Scott | 0 | – | 8 | $125K | Jul 10, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 10.9% | 13G | Feb 6, 2026 | filing ↗ | |
| Primecap Management CO/CA/ | 8.5% | 13G | Feb 11, 2026 | filing ↗ | |
| AQR Capital Management, LLC | 6.9% | 13G | Feb 13, 2026 | filing ↗ | |
| AQR Capital Management Holdings, LLC | 6.9% | 13G | Feb 13, 2026 | filing ↗ | |
| Vanguard Portfolio Management | 6.1% | 13G | Apr 29, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.3% | 13G | Apr 30, 2026 | filing ↗ | |
| North REEF Capital Management LP | 5.3% | 13G | May 15, 2026 | filing ↗ | |
| North REEF Capital Management GP LLC | 5.3% | 13G | May 15, 2026 | filing ↗ | |
| James Hanna, III | 5.3% | 13G | May 15, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Pintoff Scott | $44K | May 11, 2026 | filing ↗ |
| Pintoff Scott | $67K | Jan 12, 2026 | filing ↗ |
| Pintoff Scott | $18K | Dec 12, 2025 | filing ↗ |
| Kevin M. McPherson | $277K | Sep 12, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jun 10, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Other events (8.01) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 16, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 4, 2026 | filing ↗ |
| Earnings (2.02) | Feb 4, 2026 | filing ↗ |
| New financial obligation (2.03) | Feb 4, 2026 | filing ↗ |
| Other events (8.01) | Feb 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 4, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 22, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 9, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 9, 2025 | filing ↗ |
| Earnings (2.02) | Nov 7, 2025 | filing ↗ |
| Other events (8.01) | Nov 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 7, 2025 | filing ↗ |
| Earnings (2.02) | Aug 6, 2025 | filing ↗ |
| Other events (8.01) | Aug 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 6, 2025 | filing ↗ |