CURIS (CRIS) CDO Jonathan Zung converts Series B preferred into 66,667 common shares

Rhea-AI Filing Summary

CURIS INC CDO Jonathan B. Zung converted preferred stock into common shares. On March 20, 2026, he converted 50 shares of Series B Convertible Preferred Stock into 66,667 shares of common stock for no additional cash consideration. Following the conversion, he holds 66,667 common shares directly.

Insider Trade Summary

50 shares exercised/converted

Mixed 2 txns

Insider Zung Jonathan B.

Role CDO

Type	Security	Shares	Price	Value
Conversion	Series B Convertible Preferred Stock	50	$0.00	--
Conversion	Common Stock	66,667	$0.00	--

Holdings After Transaction: Series B Convertible Preferred Stock — 0 shares (Direct); Common Stock — 66,667 shares (Direct)

Footnotes (1)

1. [object Object]

Form 4 Insider Transactions: What Each Field Means →

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

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^*

Zung Jonathan B.

(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)

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

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		66,667	A	(1)	66,667	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			50	(1)	(1)	Common Stock	66,667	(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 INC (CRIS) report for Jonathan B. Zung?

CURIS INC reported that CDO Jonathan B. Zung converted 50 shares of Series B Convertible Preferred Stock into 66,667 shares of common stock. This was a non-cash derivative conversion, increasing his direct common stock holdings to 66,667 shares after the transaction.

Was cash paid in the CRIS insider conversion by Jonathan B. Zung?

No cash was paid in this transaction. Jonathan B. Zung’s 50 shares of Series B Convertible Preferred Stock converted into 66,667 common shares at a stated price of $0.00 per share, reflecting an automatic conversion under the security’s terms.

How many CRIS common shares does Jonathan B. Zung hold after the conversion?

After the reported conversion, Jonathan B. Zung directly holds 66,667 shares of CURIS INC common stock. These shares resulted from exchanging 50 shares of Series B Convertible Preferred Stock into common stock in a single derivative conversion transaction.

What security did Jonathan B. Zung convert into CRIS common stock?

He converted shares of Series B Convertible Non-Redeemable Preferred Stock into CURIS INC common stock. Specifically, 50 preferred shares were converted into 66,667 common shares in a derivative conversion classified under transaction code “C” for conversion of derivative security.

How is the CRIS insider transaction by Jonathan B. Zung classified on Form 4?

The transaction is classified as a derivative conversion with transaction code “C”. It reflects the conversion of 50 shares of Series B Convertible Preferred Stock into 66,667 common shares, counted as an acquisition rather than an open-market purchase or sale.