Company profile
MBX Biosciences, Inc. Insider Trading
MBXEvery SEC Form 4 insider trading filing for MBX Biosciences, Inc. (MBX) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Pharmaceutical Preparations
- CIK
- 0001776111
- Filings
- 70
- Insiders
- 32
- Last filing
- 2026-08-04
Activity summary
Recent insider activity is bullish. Over the last 30 days, 4 insiders purchased shares versus 1 sale. Buying was led by Smither John W.
Three year balance
Buy and sell value by quarter, Q3 24 to Q3 26. MBX Biosciences, Inc. insiders are net buyers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $136.0M.
90 day insight
Over the last 90 days, MBX Biosciences, Inc. insiders bought $0 (11 transactions) and sold $24K (1 transaction).
- Most active insider: Hoerter Steven L. with 3 transactions totaling $0.
- Largest single sale: $24K by Azoulay Salomon on Aug 4, 2026.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 4, 2026 | Azoulay Salomon | MBX | Sale | 370 | $65.77 | $24K |
| Aug 3, 2026 | Smither John W | MBX | Award | 130,000 | — | — |
| Aug 3, 2026 | Hoerter Steven L. | MBX | Award | 71,000 | — | — |
| Aug 3, 2026 | Hoerter Steven L. | MBX | Award | 331,000 | — | — |
| Aug 3, 2026 | Smither John W | MBX | Award | 28,000 | — | — |
45 more transactions hidden
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Query this yourself
The same rows, over the API.
curl "https://api.form4api.com/v1/transactions?ticker=MBX" \
-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of MBX Biosciences, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →