MBX Biosciences, Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for MBX Biosciences, Inc. (MBX), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are MBX insiders buying or selling?
In the last 12 months, MBX Biosciences, Inc. insiders reported 3 open-market purchases ($1.1M) and 4 sales ($2.7M) — net selling of $1.7M. Since September 2024, Trabud has recorded 27 Form 4 filings for MBX: 23 buys ($153.7M) and 4 sells ($2.7M).
Source: SEC EDGAR Form 4
Key Statistics (September 2024 – Aug 5, 2026)
Total Form 4 filings
27
SEC EDGAR
Insider filers
19
Insider buys (23)
$153.7M
Insider sells (4)
$2.7M
Insider sentiment
Net buyingNet insider flow of $151.0M in net buying since September 2024, and $1.7M in net selling over the last 12 months.
Recent MBX insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Aug 5, 2026 | Salomon Azoulay | Chief Medical Officer | Sale | 370 | $65.77 | $24.3K | SEC ↗ |
| May 11, 2026 | Salomon Azoulay | Chief Medical Officer | Sale | 70.0K | $38.36 | $2.7M | SEC ↗ |
| May 8, 2026 | Salomon Azoulay | Chief Medical Officer | Sale | 231 | $29.54 | $6.8K | SEC ↗ |
| May 8, 2026 | Hawryluk P. Kent | President & CEO | Sale | 607 | $29.54 | $17.9K | SEC ↗ |
| Mar 16, 2026 | Hawryluk P. Kent | President & CEO | Purchase | 18.5K | $28.41 | $525.7K | SEC ↗ |
| Oct 21, 2025 | Hawryluk P. Kent | President & CEO | Purchase | 20.0K | $13.64 | $272.8K | SEC ↗ |
| Oct 20, 2025 | Steven L. Hoerter | Director | Purchase | 20.0K | $13.25 | $265.0K | SEC ↗ |
| Sep 30, 2025 | Patrick J Heron | Director, 10% Owner | Purchase | 666.7K | $18.00 | $12.0M | SEC ↗ |
| Apr 10, 2025 | Ora H. Pescovitz | Director | Purchase | 7.7K | $5.89 | $45.3K | SEC ↗ |
| Feb 19, 2025 | Carl L Gordon | Director, 10% Owner | Purchase | 190.7K | $10.60 | $2.0M | SEC ↗ |
| Feb 19, 2025 | ORBIMED ADVISORS LLC | Director, 10% Owner | Purchase | 190.7K | $10.60 | $2.0M | SEC ↗ |
| Feb 5, 2025 | Hawryluk P. Kent | President & CEO | Purchase | 50.0K | $10.69 | $534.5K | SEC ↗ |
| Sep 18, 2024 | Edward T Mathers | Director, 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Forest Baskett | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Ali Behbahani | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Carmen Chang | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Anthony A. Florence Jr. | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Mohamad Makhzoumi | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Paul Edward Walker | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Rick Yang | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | Scott D Sandell | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | ORBIMED ADVISORS LLC | Director, 10% Owner | Purchase | 750.0K | $16.00 | $12.0M | SEC ↗ |
| Sep 18, 2024 | New Enterprise Associates 17, L.P. | 10% Owner | Purchase | 500.0K | $16.00 | $8.0M | SEC ↗ |
| Sep 18, 2024 | James N Topper | 10% Owner | Purchase | 625.0K | $16.00 | $10.0M | SEC ↗ |
| Sep 18, 2024 | Patrick J Heron | Director, 10% Owner | Purchase | 625.0K | $16.00 | $10.0M | SEC ↗ |
Showing the 25 most recent of 27 Form 4 filings for MBX Biosciences, Inc..
Most active MBX insiders
- Hawryluk P. Kent4 filings
- Salomon Azoulay3 filings
- Carl L Gordon2 filings
- ORBIMED ADVISORS LLC2 filings
- Patrick J Heron2 filings
Ask anything about MBX insider activity
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Open the AI agentMBX insider trading FAQ
Are MBX Biosciences, Inc. insiders buying or selling?
In the last 12 months, MBX Biosciences, Inc. insiders reported 3 open-market purchases ($1.1M) and 4 sales ($2.7M) — net selling of $1.7M. Since September 2024, Trabud has recorded 27 Form 4 filings for MBX: 23 buys ($153.7M) and 4 sells ($2.7M). Over the full record that is net buying of $151.0M.
How many insiders trade MBX stock?
19 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for MBX Biosciences, Inc.. The most recent filing was accepted on Aug 5, 2026.
Where does Trabud get MBX insider trading data?
All MBX insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.