MBX Biosciences, Inc. Common Stock (MBX) Insider Trading
Over the last 3 months, MBX insiders made 0 open-market buys and 1 sale, a net sale of -$24K (SEC Form 4). Over the last 6 months, 41 institutions increased and 52 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$24.3K
Insider trades by month Buys Sells
Apr
Sep
Oct
Mar
May
Aug
Context3-month price +96.1%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 5, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Sell | 370 | $65.77 |
| Aug 4, 2026 | Hoerter Steven L.director, officer: President and CEO | Grant | 331,000 | $64.41 |
| Aug 4, 2026 | Hoerter Steven L.director, officer: President and CEO | Grant | 71,000 | — |
| Aug 4, 2026 | Smither John Wofficer: Chief Financial Officer | Grant | 130,000 | $64.41 |
| Aug 4, 2026 | Smither John Wofficer: Chief Financial Officer | Grant | 28,000 | — |
| Jun 5, 2026 | Heron Patrick Jdirector, 10 percent owner: | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Mathers Edward Tdirector | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Pescovitz Ora H.director | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Aynechi Tibadirector | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Ryder Stevendirector | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Hoerter Steven L.director | Grant | 12,500 | $30.91 |
| Jun 5, 2026 | Stelzer Lauriedirector | Grant | 12,500 | $30.91 |
| May 11, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Sell | 55,000 | $38.38 |
| May 11, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Sell | 15,003 | $38.30 |
| May 11, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Option | 15,003 | $16.00 |
| May 11, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Option | 55,000 | $10.46 |
| May 8, 2026 | Hawryluk P. Kentdirector, officer: President & CEO | Sell | 607 | $29.54 |
| May 8, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Sell | 231 | $29.54 |
| May 4, 2026 | Hoerter Steven L.director | Grant | 74,249 | $29.78 |
| May 4, 2026 | Hoerter Steven L.director | Grant | 11,938 | — |
| Apr 22, 2026 | Hoerter Steven L.director | Grant | 33,751 | $24.74 |
| Apr 22, 2026 | Hoerter Steven L.director | Grant | 0 | $27.08 |
| Mar 16, 2026 | Hawryluk P. Kentdirector, officer: President & CEO | Buy | 18,500 | $28.41 |
| Feb 27, 2026 | Hawryluk P. Kentdirector, officer: President & CEO | Option | 28,768 | $16.00 |
| Feb 3, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Grant | 70,000 | $39.07 |
| Feb 3, 2026 | Hawryluk P. Kentdirector, officer: President & CEO | Grant | 164,500 | $39.07 |
| Feb 3, 2026 | Hawryluk P. Kentdirector, officer: President & CEO | Grant | 35,250 | — |
| Feb 3, 2026 | Bartram Richardofficer: Chief Financial Officer | Grant | 15,000 | — |
| Feb 3, 2026 | Bartram Richardofficer: Chief Financial Officer | Grant | 70,000 | $39.07 |
| Feb 3, 2026 | Azoulay Salomonofficer: Chief Medical Officer | Grant | 15,000 | — |
Source: MBX SEC Form 4 filings, latest Aug 5, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MBX positions over the last 6 months (SEC Form 13F).
Increased
41
New positions
39
Reduced
52
Sold out
156
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| FRAZIER LIFE SCIENCES MANAGEMENT, L.P. | Unchanged | 6.7M | May 15, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 3.6M | May 15, 2026 |
| NEA MANAGEMENT COMPANY, LLC | Unchanged | 3.6M | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 3.2M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 2.9M | May 13, 2026 |
| FMR LLC | Increased | 2.9M | May 15, 2026 |
| DEEP TRACK CAPITAL, LP | Reduced | 2.8M | May 15, 2026 |
| NVP ASSOCIATES, LLC | Unchanged | 2.1M | May 15, 2026 |
| POLAR CAPITAL HOLDINGS PLC | New Position | 1.6M | May 15, 2026 |
| BRAIDWELL LP | Increased | 1.5M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.5M | May 15, 2026 |
| AARON WEALTH ADVISORS LLC | Increased | 1.2M | Apr 21, 2026 |
| CORMORANT ASSET MANAGEMENT, LP | Unchanged | 1.1M | May 15, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 1.0M | May 15, 2026 |
| DRIEHAUS CAPITAL MANAGEMENT LLC | Reduced | 1.0M | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.