Curis Inc (CRIS) director converts Series B preferred into 26,667 common shares

Rhea-AI Filing Summary

Curis Inc director Marc Rubin converted preferred stock into common shares. On March 20, 2026, he converted 20 shares of Series B Convertible Preferred Stock into 26,667 shares of Common Stock for no additional consideration through an automatic conversion.

Following the conversion, Rubin directly owned 28,108 shares of Curis Common Stock. The preferred shares were originally sold as part of a $1,000.00 "Security" unit that also included Series A, B and C warrants, and converted subject to stated beneficial ownership limitations.

SEC Form 4

FORM 4

UNITED 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

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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^*

Rubin Marc

(Last) (First) (Middle)

128 SPRING STREET

BUILDING C - SUITE 500

(Street)

LEXINGTON MASSACHUSETTS 02421

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CURIS INC [ CRIS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/20/2026		C		26,667	A	(1)	28,108	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series B Convertible Preferred Stock	(1)	03/20/2026		C			20	(1)	(1)	Common Stock	26,667	(1)	0	D

Explanation of Responses:

1. Each share of Series B Convertible Non-Redeemable Preferred Stock ("Series B Preferred Stock") automatically converted into 1,333.33 shares of Common Stock, for no additional consideration, at 5 p. m. Eastern Time on March 20, 2026, subject to the terms of the Certificate of Designations, Preferences and Rights of Series B Convertible Non-Redeemable Preferred Stock of Curis, Inc. (the "Certificate of Designations") and subject to the applicable Beneficial Ownership Limitations (as defined in the Certificate of Designations). Each share of Series B Preferred Stock was sold together with a Series A Warrant to purchase 1,333.33 shares of Common Stock, a Series B Warrant to purchase 1,333.33 shares of Common Stock and a Series C Warrant to purchase 1,333.33 shares of Common Stock (collectively, a "Security"). The Securities were sold at a purchase price of $1,000.00 per Security to the Reporting Person.

Remarks:

	/s/ Diantha Duvall, Attorney-in-fact	03/23/2026
	** Signature of Reporting Person	Date
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 transaction did Curis (CRIS) report in this Form 4?

Curis reported that director Marc Rubin converted 20 shares of Series B Convertible Preferred Stock into 26,667 shares of Common Stock. The conversion occurred automatically on March 20, 2026, for no additional consideration, reflecting a shift from preferred to common equity exposure.

How many Curis (CRIS) common shares does Marc Rubin hold after this conversion?

After the conversion, Marc Rubin directly holds 28,108 shares of Curis Common Stock. This figure includes the 26,667 shares received from converting 20 shares of Series B Convertible Preferred Stock, as reported in the Form 4 insider filing for March 20, 2026.

What were the terms of the Curis Series B Preferred Stock conversion for Marc Rubin?

Each share of Series B Convertible Non-Redeemable Preferred Stock automatically converted into 1,333.33 shares of Common Stock at 5 p.m. Eastern Time on March 20, 2026, for no additional consideration, subject to the Certificate of Designations and applicable Beneficial Ownership Limitations.

At what price were the Curis Series B Preferred Securities originally sold to Marc Rubin?

Each Security, consisting of one share of Series B Preferred Stock and associated warrants, was sold to Marc Rubin at a purchase price of $1,000.00 per Security. The unit also included Series A, B and C warrants to purchase additional shares of Curis Common Stock.

Does Marc Rubin retain any Series B Preferred Stock of Curis after this transaction?

The Form 4 shows that following the reported transaction, Marc Rubin held zero shares of Series B Convertible Preferred Stock. The 20 preferred shares reported were fully converted into 26,667 Curis Common Stock shares as part of the automatic conversion on March 20, 2026.

Were there any cash proceeds to Marc Rubin from this Curis stock conversion?

The conversion of the Series B Preferred Stock into Common Stock occurred for no additional consideration, meaning there was no cash paid or received at the time of conversion. The economic change was strictly an exchange of preferred equity for common equity in Curis.