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Moleculin Biotech (MBRX) CSO buys common stock and Series I Warrants

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Moleculin Biotech, Inc. reports that Chief Science Officer Donald H. Picker purchased 173,333 shares of common stock and Series I Warrants to purchase 519,999 shares on August 3, 2026, in a public offering at a combined purchase price of $0.75 per one share and three warrants. Following these transactions, he directly holds 174,086 common shares and 539,595 Series I Warrants.

Positive

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Insider PICKER DONALD H
Role Chief Science Officer
Bought 693,332 shs
Type Security Shares Price Value
Purchase Series I Warrants F1 519,999 -- --
Purchase Common Stock F1 173,333 -- --
Holdings After Transaction: Series I Warrants — 539,595 shares (Direct); Common Stock — 174,086 shares (Direct)
Footnotes (1)
  1. F1. On August 3, 2026, The reporting person acquired 173,333 shares of common stock and Series I warrants to purchase 519,999 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 173,333 shares Purchased on August 3, 2026 in a public offering
Series I Warrants purchased 519,999 warrants Acquired on August 3, 2026 alongside common shares in a public offering
Combined purchase price $0.75 Per one share of common stock and three accompanying warrants in a public offering
Common shares held after 174,086 shares Directly owned by Donald H. Picker after the August 3, 2026 transactions
Series I Warrants held after 539,595 warrants Directly owned by Donald H. Picker after the August 3, 2026 transactions
Series I Warrants financial
"acquired 173,333 shares of common stock and Series I warrants to purchase 519,999 shares"
combined purchase price financial
"at a combined purchase price of $0.75 per one share of common stock"
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.

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

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FAQ

What insider transaction did Moleculin Biotech (MBRX) report for Donald H. Picker?

Moleculin Biotech reported that Chief Science Officer Donald H. Picker bought 173,333 common shares and Series I Warrants for 519,999 shares on August 3, 2026, in a public offering. The filing shows these are directly owned holdings.

How many Moleculin Biotech (MBRX) shares does Donald H. Picker own after this Form 4?

After the reported purchases, Donald H. Picker directly owns 174,086 shares of Moleculin Biotech common stock. He also directly holds 539,595 Series I Warrants, each exercisable for common stock, according to the Form 4 data.

What warrants did Moleculin Biotech (MBRX) CSO acquire in the August 3, 2026 transaction?

Donald H. Picker acquired Series I Warrants to purchase 519,999 shares of Moleculin Biotech common stock. These warrants were acquired together with common shares as part of a public offering at a combined price per share and accompanying warrants.

At what price did Donald H. Picker buy Moleculin Biotech (MBRX) securities?

Donald H. Picker bought the securities at a combined purchase price of $0.75 per one share of common stock and three accompanying Series I Warrants. This combined pricing applied within a public offering structure described in the Form 4 footnote.

Was Donald H. Picker’s Moleculin Biotech (MBRX) purchase under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed, and no footnote references a trading plan. The transactions are reported simply as open market or private purchases linked to a public offering.
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*
PICKER DONALD H

(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 Science 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 Stock08/03/2026P173,333A(1)174,086D
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)08/03/2026P519,99908/03/202608/03/2026Common Stock519,999(1)539,595(1)D
Explanation of Responses:
1. On August 3, 2026, The reporting person acquired 173,333 shares of common stock and Series I warrants to purchase 519,999 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. Foster by Power of Attorney08/05/2026
** 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)