Form4insider filings, from the source

Company · CIK 0001776111 · SIC 2834 — Pharmaceutical Preparations · Nasdaq

MBX Biosciences, Inc. · MBX

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $24k · 1net −$24k
$10k$10k$100k$100k$1M$1MbuyssalesAug 3Aug 3Aug 3Aug 4Aug 4Aug 4Aug 5

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Aug 4, 2026 SForm 4 →Aug 5, 4:57 pm EDTSalomon AzoulayChief Medical Officer370$65.77$24,33514,399−2.51%
Aug 3, 2026 AForm 4 →Aug 4, 8:51 am EDTJohn W SmitherChief Financial Officer28,000——28,000—
Aug 3, 2026 AForm 4 →Aug 4, 8:50 am EDTSteven L. HoerterPresident and CEO, Director71,000——82,938—

Reported at this company — derivatives (options, RSUs, warrants)

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Aug 3, 2026 AForm 4 →Aug 4, 8:51 am EDTJohn W SmitherChief Financial Officer130,000——130,000—
Aug 3, 2026 AForm 4 →Aug 4, 8:50 am EDTSteven L. HoerterPresident and CEO, Director331,000——331,000—
Jun 4, 2026 AForm 4 →Jun 5, 2:35 pm EDTEdward T MathersDirector12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:59 am EDTOra H. PescovitzDirector12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:59 am EDTPatrick J HeronDirector, 10% Owner12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:58 am EDTLaurie StelzerDirector12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:57 am EDTSteven L. HoerterDirector12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:54 am EDTSteven RyderDirector12,500——12,500—
Jun 4, 2026 AForm 4 →Jun 5, 7:53 am EDTTiba AynechiDirector12,500——12,500—