MBX

MBX Biosciences, Inc.

Insider trading activity for MBX Biosciences, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$288.4K

net selling

Bought(0 · 0 insiders): $0
Sold(2 · 2 insiders): $288.4K

Past 6 months

-$312.7K

net selling

Bought(0 · 0 insiders): $0
Sold(3 · 2 insiders): $312.7K

Past 12 months

-$2.5M

net selling

Bought(1 · 1 insiders): $525.7K
Sold(7 · 3 insiders): $3M

Transaction history

The 49 most recent Form 4 transactions.

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Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Nov 10	Hoerter Steven L.	Chairman, President and…	SSELL	4,893	$54.82	$268.2K	-5.9%	Open the original filing on SEC.gov
Nov 4	Azoulay Salomon	Chief Medical Officer	SSELL	373	$53.96	$20.1K	-2.6%	Open the original filing on SEC.gov
Oct 20	Radovich Peter	Director	AGRANT◆	18,200	—	—	—	Open the original filing on SEC.gov
Aug 4	Azoulay Salomon	Chief Medical Officer	SSELL	370	$65.77	$24.3K	-2.5%	Open the original filing on SEC.gov
Aug 3	Smither John W	Chief Financial Officer	AGRANT◆	130,000	—	—	—	Open the original filing on SEC.gov
Aug 3	Smither John W	Chief Financial Officer	AGRANT	28,000	—	—	—	Open the original filing on SEC.gov
Aug 3	Hoerter Steven L.	President and CEO	AGRANT◆	331,000	—	—	—	Open the original filing on SEC.gov
Aug 3	Hoerter Steven L.	President and CEO	AGRANT	71,000	—	—	+594.7%	Open the original filing on SEC.gov
Jun 4	Mathers Edward T	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Pescovitz Ora H.	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Stelzer Laurie	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Ryder Steven	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Hoerter Steven L.	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Heron Patrick J	Director, 10% Owner	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
Jun 4	Aynechi Tiba	Director	AGRANT◆	12,500	—	—	—	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	MEXER◷◆	15,003	—	—	—	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	MEXER◷◆	55,000	—	—	—	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	SSELL◷	15,003	$38.30	$574.6K	-50.4%	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	MEXER◷	15,003	$16.00	$240K	+101.6%	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	SSELL◷	55,000	$38.38	$2.1M	-78.8%	Open the original filing on SEC.gov
May 8	Azoulay Salomon	Chief Medical Officer	MEXER◷	55,000	$10.46	$575.3K	+372.4%	Open the original filing on SEC.gov
May 6	Hawryluk P. Kent	President & CEO	SSELL	607	$29.54	$17.9K	<0.1%	Open the original filing on SEC.gov
May 6	Azoulay Salomon	Chief Medical Officer	SSELL	231	$29.54	$6.8K	-1.5%	Open the original filing on SEC.gov
May 1	Hoerter Steven L.	Director	AGRANT◆	74,249	—	—	—	Open the original filing on SEC.gov
May 1	Hoerter Steven L.	Director	AGRANT	11,938	—	—	—	Open the original filing on SEC.gov
Mar 13	Hawryluk P. Kent	President & CEO	PBUY	18,500	$28.41	$525.7K	+4.0%	Open the original filing on SEC.gov
Feb 26	Hawryluk P. Kent	President & CEO	MEXER◆	28,768	—	—	—	Open the original filing on SEC.gov
Feb 26	Hawryluk P. Kent	President & CEO	MEXER	28,768	$16.00	$460.3K	+4.1%	Open the original filing on SEC.gov
Feb 2	Hawryluk P. Kent	President & CEO	AGRANT◆	164,500	—	—	—	Open the original filing on SEC.gov
Feb 2	Hawryluk P. Kent	President & CEO	AGRANT	35,250	—	—	+5.3%	Open the original filing on SEC.gov
Feb 2	Bartram Richard	Chief Financial Officer	AGRANT◆	70,000	—	—	—	Open the original filing on SEC.gov
Feb 2	Bartram Richard	Chief Financial Officer	AGRANT	15,000	—	—	—	Open the original filing on SEC.gov
Feb 2	Azoulay Salomon	Chief Medical Officer	AGRANT◆	70,000	—	—	—	Open the original filing on SEC.gov
Feb 2	Azoulay Salomon	Chief Medical Officer	AGRANT	15,000	—	—	—	Open the original filing on SEC.gov
Jan 20	Stelzer Laurie	Director	AGRANT◆	32,000	—	—	—	Open the original filing on SEC.gov
Nov 22, 2025	Hoerter Steven L.	Director	AGRANT◆↺	0	—	—	—	Open the original filing on SEC.gov
Nov 6, 2025	Hoerter Steven L.	Director	AGRANT◆↺	33,751	—	—	—	Open the original filing on SEC.gov
Oct 24, 2025	Hawryluk P. Kent	President & CEO	MEXER◆	182,859	—	—	—	Open the original filing on SEC.gov
Oct 24, 2025	Hawryluk P. Kent	President & CEO	MEXER	182,859	$3.25	$594.3K	+38.0%	Open the original filing on SEC.gov
Oct 20, 2025	Hawryluk P. Kent	President & CEO	PBUY	20,000	$13.64	$272.8K	+4.5%	Open the original filing on SEC.gov
Oct 17, 2025	Hoerter Steven L.	Director	PBUY	20,000	$13.25	$265K	—	Open the original filing on SEC.gov
Sep 26, 2025	Heron Patrick J	Director, 10% Owner	PBUY	666,666	$18.00	$12M	+14.6%	Open the original filing on SEC.gov
Jun 5, 2025	Mathers Edward T	Director, 10% Owner	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Ryder Steven	Director	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Pescovitz Ora H.	Director	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Hoerter Steven L.	Director	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Heron Patrick J	Director, 10% Owner	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Cornelius James M	Director	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov
Jun 5, 2025	Aynechi Tiba	Director	AGRANT◆	16,000	—	—	—	Open the original filing on SEC.gov

SSELL$268.2K

Hoerter Steven L. · Chairman, Presiden…Nov 10

4,893 sh @ $54.82 · -5.9% own

SSELL$20.1K

Azoulay Salomon · Chief Medical…Nov 4

373 sh @ $53.96 · -2.6% own

AGRANT◆—

Radovich Peter · DirectorOct 20

18,200 sh

SSELL$24.3K

Azoulay Salomon · Chief Medical…Aug 4

370 sh @ $65.77 · -2.5% own

AGRANT◆—

Smither John W · Chief Financial…Aug 3

130,000 sh

AGRANT—

Smither John W · Chief Financial…Aug 3

28,000 sh

AGRANT◆—

Hoerter Steven L. · President and CEOAug 3

331,000 sh

AGRANT—

Hoerter Steven L. · President and CEOAug 3

71,000 sh · +594.7% own

AGRANT◆—

Mathers Edward T · DirectorJun 4

12,500 sh

AGRANT◆—

Pescovitz Ora H. · DirectorJun 4

12,500 sh

AGRANT◆—

Stelzer Laurie · DirectorJun 4

12,500 sh

AGRANT◆—

Ryder Steven · DirectorJun 4

12,500 sh

AGRANT◆—

Hoerter Steven L. · DirectorJun 4

12,500 sh

AGRANT◆—

Heron Patrick J · Director, 10%…Jun 4

12,500 sh

AGRANT◆—

Aynechi Tiba · DirectorJun 4

12,500 sh

MEXER◷◆—

Azoulay Salomon · Chief Medical…May 8

15,003 sh

MEXER◷◆—

Azoulay Salomon · Chief Medical…May 8

55,000 sh

SSELL◷$574.6K

Azoulay Salomon · Chief Medical…May 8

15,003 sh @ $38.30 · -50.4% own

MEXER◷$240K

Azoulay Salomon · Chief Medical…May 8

15,003 sh @ $16.00 · +101.6% own

SSELL◷$2.1M

Azoulay Salomon · Chief Medical…May 8

55,000 sh @ $38.38 · -78.8% own

MEXER◷$575.3K

Azoulay Salomon · Chief Medical…May 8

55,000 sh @ $10.46 · +372.4% own

SSELL$17.9K

Hawryluk P. Kent · President & CEOMay 6

607 sh @ $29.54 · <0.1% own

SSELL$6.8K

Azoulay Salomon · Chief Medical…May 6

231 sh @ $29.54 · -1.5% own

AGRANT◆—

Hoerter Steven L. · DirectorMay 1

74,249 sh

AGRANT—

Hoerter Steven L. · DirectorMay 1

11,938 sh

PBUY$525.7K

Hawryluk P. Kent · President & CEOMar 13

18,500 sh @ $28.41 · +4.0% own

MEXER◆—

Hawryluk P. Kent · President & CEOFeb 26

28,768 sh

MEXER$460.3K

Hawryluk P. Kent · President & CEOFeb 26

28,768 sh @ $16.00 · +4.1% own

AGRANT◆—

Hawryluk P. Kent · President & CEOFeb 2

164,500 sh

AGRANT—

Hawryluk P. Kent · President & CEOFeb 2

35,250 sh · +5.3% own

AGRANT◆—

Bartram Richard · Chief Financial…Feb 2

70,000 sh

AGRANT—

Bartram Richard · Chief Financial…Feb 2

15,000 sh

AGRANT◆—

Azoulay Salomon · Chief Medical…Feb 2

70,000 sh

AGRANT—

Azoulay Salomon · Chief Medical…Feb 2

15,000 sh

AGRANT◆—

Stelzer Laurie · DirectorJan 20

32,000 sh

AGRANT◆↺—

Hoerter Steven L. · DirectorNov 22, 2025

0 sh

AGRANT◆↺—

Hoerter Steven L. · DirectorNov 6, 2025

33,751 sh

MEXER◆—

Hawryluk P. Kent · President & CEOOct 24, 2025

182,859 sh

MEXER$594.3K

Hawryluk P. Kent · President & CEOOct 24, 2025

182,859 sh @ $3.25 · +38.0% own

PBUY$272.8K

Hawryluk P. Kent · President & CEOOct 20, 2025

20,000 sh @ $13.64 · +4.5% own

PBUY$265K

Hoerter Steven L. · DirectorOct 17, 2025

20,000 sh @ $13.25

PBUY$12M

Heron Patrick J · Director, 10%…Sep 26, 2025

666,666 sh @ $18.00 · +14.6% own

AGRANT◆—

Mathers Edward T · Director, 10%…Jun 5, 2025

16,000 sh

AGRANT◆—

Ryder Steven · DirectorJun 5, 2025

16,000 sh

AGRANT◆—

Pescovitz Ora H. · DirectorJun 5, 2025

16,000 sh

AGRANT◆—

Hoerter Steven L. · DirectorJun 5, 2025

16,000 sh

AGRANT◆—

Heron Patrick J · Director, 10%…Jun 5, 2025

16,000 sh

AGRANT◆—

Cornelius James M · DirectorJun 5, 2025

16,000 sh

AGRANT◆—

Aynechi Tiba · DirectorJun 5, 2025

16,000 sh

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 34 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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