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Moleculin Biotech, Inc. (MBRX) CFO buys 293,333 shares and 879,999 warrants

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

On August 3, 2026, Moleculin Biotech, Inc. Chief Financial Officer Jonathan P. Foster purchased 293,333 shares of common stock and 879,999 Series I Warrants in a public offering at a combined price of $0.75 per one share of common stock and three accompanying warrants. Following these transactions, he directly held 305,673 shares of common stock and 1,027,717 Series I Warrants to purchase common stock, which are reported with an expiration date of August 3, 2031.

Positive

  • None.

Negative

  • None.
Insider Foster Jonathan P.
Role Chief Financial Officer
Bought 1,173,332 shs
Type Security Shares Price Value
Purchase Series I Warrants F1 879,999 -- --
Purchase Common Stock F1 293,333 -- --
Holdings After Transaction: Series I Warrants — 1,027,717 shares (Direct); Common Stock — 305,673 shares (Direct)
Footnotes (1)
  1. F1. On August 3, 2026, the reporting person acquired 293,333 shares of common stock and Series I warrants to purchase 879,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering.
Common shares purchased 293,333 shares Shares of Moleculin Biotech common stock acquired by the CFO on August 3, 2026
Common shares held after 305,673 shares Total direct common stock holdings of the CFO following the August 3, 2026 purchase
Series I Warrants purchased 879,999 warrants Series I Warrants to purchase common stock acquired by the CFO in the same transaction
Series I Warrants held after 1,027,717 warrants Total direct Series I Warrant holdings of the CFO after the August 3, 2026 acquisition
Combined purchase price $0.75 per one share and three warrants Pricing of units in the public offering purchased by the CFO
Warrant expiration date August 3, 2031 Expiration date reported for the Series I Warrants acquired by the CFO
Total securities bought (shares + warrants) 1,173,332 securities Sum of 293,333 common shares and 879,999 Series I Warrants acquired on August 3, 2026
Series I Warrants financial
"acquired 293,333 shares of common stock and Series I warrants to purchase 879,999 shares"
public offering financial
"three accompanying warrants in a public offering"
A public offering is when a company sells shares to the general public through the stock market, either by issuing new shares to raise cash or by letting existing owners sell their stakes. Think of it like a business opening its doors to many new owners at once: it can bring in money for growth but also increases the number of shares available, which can change the stock price and dilute existing ownership — key factors investors watch closely.
combined purchase price financial
"at a combined purchase price of $0.75 per one share of common stock"
underlying security financial
"underlying security title: Common Stock and underlying security shares reported"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What insider transaction did Moleculin Biotech (MBRX) report for its CFO?

Moleculin Biotech’s CFO Jonathan P. Foster reported buying 293,333 common shares and 879,999 Series I Warrants on August 3, 2026. These were acquired in a public offering at a combined price of $0.75 per one share and three accompanying warrants.

How many Moleculin Biotech (MBRX) shares does the CFO hold after this transaction?

After the reported purchase, the CFO directly holds 305,673 shares of Moleculin Biotech common stock. This reflects his prior holdings plus the 293,333 shares acquired on August 3, 2026 in the public offering documented in the Form 4.

How many Series I Warrants did the Moleculin Biotech (MBRX) CFO acquire and now hold?

The CFO acquired 879,999 Series I Warrants to purchase Moleculin Biotech common stock. Following this transaction, his total direct holdings of these warrants increased to 1,027,717, as reported in the insider trading disclosure for August 3, 2026.

What price did the Moleculin Biotech (MBRX) CFO pay for the stock and warrants?

He paid a combined purchase price of $0.75 per unit, where each unit consists of one share of common stock and three accompanying Series I Warrants. This combined pricing was part of Moleculin Biotech’s public offering on August 3, 2026.

When do the Moleculin Biotech (MBRX) Series I Warrants held by the CFO expire?

The reported Series I Warrants held by the CFO are shown with an expiration date of August 3, 2031. Each warrant is exercisable for Moleculin Biotech common stock, and the Form 4 links these terms to the August 3, 2026 acquisition.

Was the Moleculin Biotech (MBRX) CFO’s purchase made under a Rule 10b5-1 trading plan?

The disclosure indicates the Rule 10b5-1 checkbox is not affirmed for this transaction. The footnote instead describes the purchases as occurring in a public offering, without stating they were made under a pre-arranged trading plan.
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*
Foster Jonathan P.

(Last)(First)(Middle)
C/O MOLECULIN BIOTECH, INC.
5300 MEMORIAL DR., SUITE 950

(Street)
HOUSTON TEXAS 77007

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Moleculin Biotech, Inc. [ MBRX ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026
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 Stock08/03/2026P293,333A(1)305,673D
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
Series I Warrants(1)08/03/2026P879,99908/03/202608/03/2031Common Stock879,999(1)1,027,717D
Explanation of Responses:
1. On August 3, 2026, the reporting person acquired 293,333 shares of common stock and Series I warrants to purchase 879,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering.
/s/ Jonathan P. Foster08/05/2026
** 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)