Biggest Insider Buys — May 2026
The largest open-market insider purchases disclosed in SEC Form 4 filings, ranked by dollar value.
In May 2026, 456 open-market insider purchases of $50K or more were disclosed across 215 companies in SEC Form 4 filings, totaling $1.3B. The largest single purchase was $310.0M by SUMITOMO MITSUI FINANCIAL GROUP, INC. at Jefferies Financial Group Inc. (JEF).
← All monthly rankingsLargest purchases · May 2026
| Source | |||||||
|---|---|---|---|---|---|---|---|
| JEF | Insider | Purchase | 6,429,337 | $310.0M | May 4 | SEC ↗ | |
| ARTV | Director, 10% Owner | Purchase | 6,510,416 | $75.0M | May 13 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 366,000 | $74.0M | May 14 | SEC ↗ | |
| BRCB | Director, 10% Owner | Purchase | 13,642,712 | $73.0M | May 19 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 307,505 | $63.9M | May 19 | SEC ↗ | |
| RIAEX | Adviser | Purchase | 1,976,000 | $49.4M | May 29 | SEC ↗ | |
| COAG | Director, 10% Owner | Purchase | 2,675,000 | $48.1M | May 6 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 119,795 | $25.0M | May 19 | SEC ↗ | |
| WGS | Director, 10% Owner | Purchase | 533,758 | $20.2M | May 12 | SEC ↗ | |
| ODTX | Director | Purchase | 1,111,111 | $20.0M | May 12 | SEC ↗ | |
| ODTX | Director | Purchase | 1,111,111 | $20.0M | May 12 | SEC ↗ | |
| WGS | Director, 10% Owner | Purchase | 500,000 | $19.6M | May 12 | SEC ↗ | |
| PS | CEO & Chairman | Purchase | 800,000 | $19.0M | May 5 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 78,150 | $15.4M | May 14 | SEC ↗ | |
| ALKT | Director, 10% Owner | Purchase | 844,772 | $14.0M | May 7 | SEC ↗ | |
| FBIN | Director | Purchase | 403,000 | $13.5M | May 21 | SEC ↗ | |
| PLSE | Director, 10% Owner | Purchase | 660,233 | $13.0M | May 15 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 60,700 | $12.9M | May 19 | SEC ↗ | |
| ALKT | Director, 10% Owner | Purchase | 750,000 | $12.7M | May 15 | SEC ↗ | |
| CSAN3 | Chief Executive Officer | Purchase | 2,441,528 | $12.5M | May 22 | SEC ↗ | |
| ALKT | Director, 10% Owner | Purchase | 700,000 | $11.8M | May 7 | SEC ↗ | |
| CSAN3 | Chief Executive Officer | Purchase | 1,599,086 | $11.3M | May 22 | SEC ↗ | |
| ALKT | Director, 10% Owner | Purchase | 675,000 | $11.1M | May 15 | SEC ↗ | |
| RSG | 10% Owner | Purchase | 55,000 | $11.1M | May 14 | SEC ↗ | |
| FCNCA | Chairman and CEO | Purchase | 5,940 | $10.3M | May 13 | SEC ↗ |