CURIS INC (CRIS) CFO converts Series B preferred into 66,666 common shares

Rhea-AI Filing Summary

CURIS INC CFO Diantha Duvall converted preferred stock into common shares. On March 20, 2026, 50 shares of Series B Convertible Preferred Stock automatically converted into 66,666 shares of Common Stock for no additional consideration, increasing her direct common stock holdings to 77,707 shares.

Each share of Series B Preferred Stock converts into 1,333.33 common shares under the company’s Certificate of Designations and is subject to specified beneficial ownership limitations. This filing reflects an internal capital structure change for the executive rather than an open‑market purchase or sale.

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

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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^*

Duvall Diantha

(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)
	CFO

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		66,666	A	(1)	77,707	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	66,666	(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	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 CFO Diantha Duvall?

CURIS INC reported that CFO Diantha Duvall converted 50 shares of Series B Convertible Preferred Stock into 66,666 shares of Common Stock. The conversion occurred automatically on March 20, 2026, under the preferred stock’s terms, with no additional cash consideration involved.

How many CURIS INC (CRIS) common shares does the CFO hold after the conversion?

After the conversion, CFO Diantha Duvall directly holds 77,707 shares of CURIS INC Common Stock. This includes the 66,666 shares received from converting 50 shares of Series B Convertible Preferred Stock, as shown in the reported Form 4 insider transaction details.

What is the conversion ratio for CURIS INC Series B Convertible Preferred Stock?

Each share of Series B Convertible Non-Redeemable Preferred Stock converts into 1,333.33 shares of CURIS INC Common Stock. This automatic conversion occurs under the Certificate of Designations and is subject to specified beneficial ownership limitations described in the preferred stock terms.

Did the CURIS INC CFO buy or sell shares in the market in this Form 4?

The CFO did not buy or sell shares in the open market. Instead, 50 shares of Series B Convertible Preferred Stock automatically converted into 66,666 common shares for no additional consideration, representing an internal change in the form of her equity holdings.

What are the beneficial ownership limitations mentioned for CURIS INC Series B Preferred Stock?

The Series B Preferred Stock conversion is subject to Beneficial Ownership Limitations defined in CURIS INC’s Certificate of Designations. These limitations restrict conversions that would raise a holder’s beneficial ownership above specified thresholds, helping control concentration of ownership in the company’s common stock.