STOCK TITAN

MBX Biosciences (NASDAQ: MBX) director awarded RSUs and 74,249 stock options

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

MBX Biosciences director Steven L. Hoerter reported new equity awards and existing holdings. He received a grant of 11,938 shares of Common Stock as restricted stock units, which will vest in full on November 6, 2026, subject to his continued service.

He was also granted stock options covering 74,249 shares of Common Stock at an exercise price of $29.78 per share, expiring on May 1, 2036. This option grant vests 50% on the grant date and the remaining 50% in equal monthly installments over six months, conditioned on continued service. Separately, 20,000 Common Stock shares are held indirectly through the Steven L Hoerter Revocable Trust, where he serves as trustee and disclaims beneficial ownership except for any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider Hoerter Steven L.
Role null
Type Security Shares Price Value
Grant/Award Stock option (right to buy) 74,249 $0.00 --
Grant/Award Common Stock 11,938 $0.00 --
holding Common Stock -- -- --
Holdings After Transaction: Stock option (right to buy) — 74,249 shares (Direct, null); Common Stock — 11,938 shares (Direct, null); Common Stock — 20,000 shares (Indirect, Trust)
Footnotes (1)
  1. Represents the grant of restricted stock units (RSUs). The RSUs will vest in full on November 6, 2026, subject to the Reporting Person's continued service on such vesting date. Shares held by the Steven L Hoerter Revocable Trust dated November 2, 2018, of which the Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose. The grant will vest 50% upon grant date and the remaining 50% in equal monthly installments over a six-month period from the grant date, subject to the Reporting Person's continued services to the Company.
RSU grant 11,938 shares Restricted stock units vesting on November 6, 2026
Stock option grant size 74,249 shares Options on Common Stock granted to director
Option exercise price $29.78 per share Stock option (right to buy) exercise price
Option expiration May 1, 2036 Stock option expiration date
Trust-held shares 20,000 shares Common Stock held by Steven L Hoerter Revocable Trust
Direct shares after RSU grant 11,938 shares Total direct Common Stock holdings following RSU award
restricted stock units (RSUs) financial
"Represents the grant of restricted stock units (RSUs). The RSUs will vest in full on November 6, 2026"
Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.
Revocable Trust financial
"Shares held by the Steven L Hoerter Revocable Trust dated November 2, 2018"
A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.
vest financial
"The RSUs will vest in full on November 6, 2026, subject to the Reporting Person's continued service"
A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.
stock option (right to buy) financial
"Stock option (right to buy) with underlying security title Common Stock"
Grant, award, or other acquisition financial
"transaction_code_description: Grant, award, or other acquisition"
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Hoerter Steven L.

(Last)(First)(Middle)
C/O MBX BIOSCIENCES INC.
11711 N. MERIDIAN STREET, SUITE 300

(Street)
CARMEL INDIANA 46032

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
MBX Biosciences, Inc. [ MBX ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock05/01/2026A11,938(1)A$011,938D
Common Stock20,000ITrust(2)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock option (right to buy)$29.7805/01/2026A74,249 (3)05/01/2036Common Stock74,249$074,249D
Explanation of Responses:
1. Represents the grant of restricted stock units (RSUs). The RSUs will vest in full on November 6, 2026, subject to the Reporting Person's continued service on such vesting date.
2. Shares held by the Steven L Hoerter Revocable Trust dated November 2, 2018, of which the Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by him for Section 16 or any other purpose.
3. The grant will vest 50% upon grant date and the remaining 50% in equal monthly installments over a six-month period from the grant date, subject to the Reporting Person's continued services to the Company.
/s/ P. Kent Hawryluk, attorney-in-fact05/04/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider equity awards did MBX director Steven L. Hoerter receive?

Steven L. Hoerter received 11,938 restricted stock units and options for 74,249 MBX Biosciences shares. The RSUs vest in full on November 6, 2026, while the options vest 50% at grant and 50% monthly over six months, subject to continued service.

When do Steven L. Hoerter’s MBX restricted stock units vest?

Hoerter’s 11,938 MBX Biosciences restricted stock units vest in full on November 6, 2026. Vesting is contingent on his continued service with the company through that date, aligning the award with long-term retention and performance incentives.

What are the key terms of Steven L. Hoerter’s MBX stock option grant?

Hoerter’s MBX stock option grant covers 74,249 shares at an exercise price of $29.78 per share, expiring May 1, 2036. The grant vests 50% on the grant date and the remaining 50% in equal monthly installments over six months, subject to continued services.

How many MBX shares does Steven L. Hoerter hold indirectly through a trust?

A revocable trust associated with Steven L. Hoerter holds 20,000 MBX Biosciences common shares. He serves as trustee and disclaims beneficial ownership except for any pecuniary interest, meaning economic benefits may accrue without full voting or investment claims.

Does this MBX Form 4 show any open-market buying or selling by Steven L. Hoerter?

The Form 4 reports equity awards and existing holdings, not open-market trades, for Steven L. Hoerter. It includes grants of restricted stock units and stock options, plus indirect trust-held shares, reflecting compensation and ownership structure rather than market purchases or sales.