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MBX Biosciences (MBX) stock: insider trades, news & valuation

Net selling
Close · Oct 9, 2026 $53.24 -0.0% on the day +235.7% over 12 months 52-week range $13.22 – $70.70

Share price and insider trades

MBX closeInsider buyInsider sale
020406080NovDecJan 2026FebMarAprMayJunJulAugSepOctSold $24,335 on 2026-08-04 · Salomon AzoulaySold $24,755 on 2026-05-06 · P. Kent Hawryluk, Salomon AzoulayBought $265,000 on 2025-10-17 · Steven L. HoerterBought $272,800 on 2025-10-20 · P. Kent HawrylukBought $525,585 on 2026-03-13 · P. Kent HawrylukSold $2,685,515 on 2026-05-08 · Salomon Azoulay
Bought, 12 months$1.1M
Sold, 12 months$2.7M
Insiders buying2
Insiders selling2

MBX Biosciences insider trading at a glance (Oct 9, 2026): in the past 12 months, 2 insiders bought $1.1M and 2 sold $2.7M of MBX stock on the open market.

MBX insider buying and selling by quarter

Open-market purchases (green, above the line) and sales (red, below), by trade date.

Q4 2025: $538K bought (2 trades)$538KQ4 2025Q1 2026: $526K bought (1 trades)$526KQ1 2026Q2 2026: $2.7M sold (4 trades)Q2 2026Q3 2026: $24K sold (1 trades)Q3 2026Q4 2026
QuarterBoughtPurchasesSoldSales
Q4 2026—0—0
Q3 2026—0$24K1
Q2 2026—0$2.7M4
Q1 2026$526K1—0
Q4 2025$538K2—0

Valuation, profit and volume

P/E (trailing)n/aSector median —
Market value— 
Profit margin—Revenue growth —
Volume vs. 50-day0.9×Last 5 sessions
Insiders' paper profit+$2.1MOn all tracked purchases +192.9%

Summary

Over the past 12 months, 2 MBX Biosciences, Inc. insiders reported open-market purchases totaling $1.1M, while 2 insiders reported sales totaling $2.7M. Among insiders with enough purchase history to measure, P. Kent Hawryluk (CEO, President) has the highest Insider Score at 100. 2 of 5 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.

Insider transactions

Open-market purchases and sales.

Filed Insider Type Shares Price Value Since Score
Aug 5SEC Salomon AzoulayChief Medical Officer Sell 37014,399 held (−3%) $65.77 $24K -19.1% —
May 11SEC Salomon AzoulayChief Medical Officer Sell Plan 55,00014,769 held (−79%) $38.38 $2.1M +38.7% —
May 11SEC Salomon AzoulayChief Medical Officer Sell Plan 15,00314,769 held (−50%) $38.30 $575K +39.0% —
May 8SEC P. Kent HawrylukCEO, President Sell 607727,667 held (−0%) $29.54 $18K +80.2% 100
May 8SEC Salomon AzoulayChief Medical Officer Sell 23114,769 held (−2%) $29.54 $7K +80.2% —
Mar 16SEC P. Kent HawrylukCEO, President Buy 18,500486,777 held (+4%) $28.41 $526K +87.4% 100
Oct 21SEC P. Kent HawrylukCEO, President Buy 20,000468,277 held (+4%) $13.64 $273K +290.3% 100
Oct 20SEC Steven L. HoerterDirector Buy 20,000new position $13.25 $265K +301.8% —

Insiders at MBX Biosciences, Inc.

InsiderBoughtSoldLast filingScore
Salomon AzoulayChief Medical Officer — $2.7M Aug 5, 2026 —
P. Kent HawrylukCEO, President $798K $18K May 8, 2026 100
Steven L. HoerterDirector $265K — Oct 20, 2025 —

MBX stock: common questions

Are MBX Biosciences, Inc. insiders buying MBX stock?

In the past 12 months, 2 insiders reported open-market purchases of MBX worth $1.1M. The latest was CEO, President P. Kent Hawryluk bought $526K of MBX at $28.41 — largest purchase by this insider in our records.

Are MBX Biosciences, Inc. insiders selling MBX stock?

2 insiders reported sales worth $2.7M over the same period.

Where does this data come from?

Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.

What is MBX's 52-week range?

Over the past year MBX has traded between $13.22 and $70.70. It last closed at $53.24 on Oct 9, 2026.