MBX Biosciences, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Hawryluk P. Kent | President & CEO | Option Exercise | 182,859 | $3.25 | $594,292 | 664,256 | Oct 24, 2025 |
| Hawryluk P. Kent | President & CEO | Purchase | 20,000 | $13.64 | $272,800 | 468,277 | Oct 20, 2025 |
| Hoerter Steven L. | — | Purchase | 20,000 | $13.25 | $265,000 | 20,000 | Oct 17, 2025 |
| FHMLS X, L.P. | — | Purchase | 666,666 | $18.00 | $11,999,988 | 5,219,440 | Sep 26, 2025 |
| Pescovitz Ora H. | — | Purchase | 7,693 | $5.89 | $45,312 | 24,329 | Apr 8, 2025 |
| GORDON CARL L | — | Purchase | 94,100 | $10.84 | $1,020,044 | 747,887 | Feb 18, 2025 |
| OrbiMed Genesis GP LLC | — | Purchase | 29,540 | $9.85 | $290,969 | 3,205,930 | Feb 18, 2025 |
| Hawryluk P. Kent | President & CEO | Purchase | 50,000 | $10.69 | $534,500 | 448,277 | Feb 4, 2025 |
| Mathers Edward T | — | Purchase | 500,000 | $16.00 | $8,000,000 | 3,614,486 | Sep 16, 2024 |
| BASKETT FOREST | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| Behbahani Ali | — | C | 1,023,103 | — | — | 1,023,103 | Sep 16, 2024 |
| Chang Carmen | — | Purchase | 500,000 | $16.00 | $8,000,000 | 3,614,486 | Sep 16, 2024 |
| Florence Anthony A. Jr. | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| Makhzoumi Mohamad | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| Walker Paul Edward | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| Yang Rick | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| SANDELL SCOTT D | — | C | 2,091,383 | — | — | 3,114,486 | Sep 16, 2024 |
| ORBIMED ADVISORS LLC | — | Purchase | 250,000 | $16.00 | $4,000,000 | 653,787 | Sep 16, 2024 |
| NEA Partners 17, L.P. | — | C | 1,023,103 | — | — | 1,023,103 | Sep 16, 2024 |
| FHMLS X, L.P. | — | Purchase | 625,000 | $16.00 | $10,000,000 | 4,552,774 | Sep 16, 2024 |
| CORNELIUS JAMES M | — | C | 102,082 | — | — | 102,082 | Sep 16, 2024 |
| Heron Patrick J | — | C | 3,927,774 | — | — | 3,927,774 | Sep 16, 2024 |
| Hawryluk P. Kent | President & CEO | C | 115,914 | — | — | 398,277 | Sep 16, 2024 |
| Aynechi Tiba | — | C | 1,386,335 | — | — | 1,386,335 | Sep 16, 2024 |
| GORDON CARL L | — | C | 403,787 | — | — | 403,787 | Sep 16, 2024 |
| Wellington Biomedical Innovation Master Investors (Cayman) II L.P. | — | C | 403,787 | — | — | 1,790,122 | Sep 16, 2024 |