CURIS INC filed a Schedule 13G reporting a shared beneficial ownership position of 4,025,992 shares, equal to 9.9% of the outstanding common stock. The reporting persons are Stonepine Capital Management, LLC; Stonepine Capital, L.P.; Stonepine GP, LLC; and Jon M. Plexico, filing jointly.
The filing states the calculation is based on 39,978,693 shares outstanding as of March 20, 2026. It also discloses warrants to acquire 10,000,002 shares that are subject to a 9.99% beneficial ownership limitation. Voting and dispositive power are reported as shared for the 4,025,992 shares; sole voting/dispositive power is reported as 0 for each reporting person.
Positive
None.
Negative
None.
Insights
Stonepine reports a near-10% shared stake with warrants limited to 9.99%.
The filing shows 4,025,992 shares of shared beneficial ownership and references warrants for 10,000,002 shares subject to a 9.99% ownership cap. This structure indicates the reported percentage reflects the exercise limit rather than unconstrained conversion.
Future disclosures may clarify whether warrant exercises or further conversions will be pursued; any changes would be visible in subsequent ownership amendments or Form 4/5 filings.
Filing signals a meaningful passive position by an investment vehicle rather than an individual controlling block.
The Partnership holds the shares for investors; the filing notes the Partnership "has the right to receive or the power to direct the receipt of dividends" for holdings above 5%. Reported shared voting/dispositive power is 4,025,992 across the named entities.
Stake size and warrant mechanics are the principal items to watch in follow-up filings for potential conversion, sales, or changes in voting power.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
CURIS INC
(Name of Issuer)
Common Stock
(Title of Class of Securities)
231269309
(CUSIP Number)
03/17/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Stonepine Capital Management, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,025,992.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,025,992.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,025,992.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.9 %
12
Type of Reporting Person (See Instructions)
IA, OO
Comment for Type of Reporting Person: The securities beneficially owned by the reporting persons consist of (1) 3,704,462 shares of Common Stock, and (2) warrants to acquire 10,000,002 shares of Common Stock, which warrants are subject to a 9.99% beneficial ownership limitation. The percentage reported herein is calculated based on 39,978,693 shares of Common Stock, outstanding as of March 20, 2026, as reported in the Form 10-K filed by the Issuer for the fiscal year ended December 31, 2025.
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Stonepine Capital, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,025,992.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,025,992.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,025,992.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.9 %
12
Type of Reporting Person (See Instructions)
PN
Comment for Type of Reporting Person: The securities beneficially owned by the reporting persons consist of (1) 3,704,462 shares of Common Stock, and (2) warrants to acquire 10,000,002 shares of Common Stock, which warrants are subject to a 9.99% beneficial ownership limitation. The percentage reported herein is calculated based on 39,978,693 shares of Common Stock, outstanding as of March 20, 2026, as reported in the Form 10-K filed by the Issuer for the fiscal year ended December 31, 2025.
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Stonepine GP, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,025,992.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,025,992.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,025,992.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.9 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: The securities beneficially owned by the reporting persons consist of (1) 3,704,462 shares of Common Stock, and (2) warrants to acquire 10,000,002 shares of Common Stock, which warrants are subject to a 9.99% beneficial ownership limitation. The percentage reported herein is calculated based on 39,978,693 shares of Common Stock, outstanding as of March 20, 2026, as reported in the Form 10-K filed by the Issuer for the fiscal year ended December 31, 2025.
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Jon M. Plexico
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,025,992.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,025,992.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,025,992.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.9 %
12
Type of Reporting Person (See Instructions)
HC, IN
Comment for Type of Reporting Person: The securities beneficially owned by the reporting persons consist of (1) 3,704,462 shares of Common Stock, and (2) warrants to acquire 10,000,002 shares of Common Stock, which warrants are subject to a 9.99% beneficial ownership limitation. The percentage reported herein is calculated based on 39,978,693 shares of Common Stock, outstanding as of March 20, 2026, as reported in the Form 10-K filed by the Issuer for the fiscal year ended December 31, 2025.
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
CURIS INC
(b)
Address of issuer's principal executive offices:
128 Spring Street, Building C - Suite 500, Lexington, MA 02421
Item 2.
(a)
Name of person filing:
Stonepine Capital Management, LLC, a Delaware limited liability company ("Stonepine")
Stonepine Capital, L.P., a Delaware limited partnership (the "Partnership")
Stonepine GP, LLC, a Delaware limited liability company (the "General Partner")
Jon M. Plexico
Stonepine and the General Partner are the investment adviser and general partner, respectively, of the Partnership. Mr. Plexico is the control person of Stonepine and the General Partner. The reporting persons are filing this Schedule 13G jointly, but not as members of a group, and each disclaims membership in a group. Each reporting person also disclaims beneficial ownership of Ordinary Shares except to the extent of that person's pecuniary interest therein. In addition, the filing of this Schedule 13G on behalf of the Partnership should not be construed as an admission that it is, and it disclaims that it is, a beneficial owner, as defined in Rule 13d-3 under the Act, of any Ordinary Shares covered by this Schedule 13G.
(b)
Address or principal business office or, if none, residence:
2900 NW Clearwater Drive, Suite 100-11, Bend OR 97703
(c)
Citizenship:
See Item 4 of the cover sheet for each reporting person.
(d)
Title of class of securities:
Common Stock
(e)
CUSIP Number(s):
231269309
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
Stonepine: 4,025,992
Partnership: 4,025,992
General Partner: 4,025,992
Jon M. Plexico: 4,025,992
(b)
Percent of class:
Stonepine: 9.9%
Partnership: 9.9%
General Partner: 9.9%
Jon M. Plexico: 9.9%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
Stonepine: 0
Partnership: 0
General Partner: 0
Jon M. Plexico: 0
(ii) Shared power to vote or to direct the vote:
Stonepine: 4,025,992
Partnership: 4,025,992
General Partner: 4,025,992
Jon M. Plexico: 4,025,992
(iii) Sole power to dispose or to direct the disposition of:
Stonepine: 0
Partnership: 0
General Partner: 0
Jon M. Plexico: 0
(iv) Shared power to dispose or to direct the disposition of:
Stonepine: 4,025,992
Partnership: 4,025,992
General Partner: 4,025,992
Jon M. Plexico: 4,025,992
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Partnership holds shares for the benefit of its investors and has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, shares.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Stonepine Capital Management, LLC
Signature:
/s/ Jon M. Plexico
Name/Title:
Managing Member
Date:
03/27/2026
Stonepine Capital, L.P.
Signature:
/s/ Jon M. Plexico
Name/Title:
Managing Member of the General Partner, Stonepine GP, LLC
Date:
03/27/2026
Stonepine GP, LLC
Signature:
/s/ Jon M. Plexico
Name/Title:
Managing Member
Date:
03/27/2026
Jon M. Plexico
Signature:
/s/ Jon M. Plexico
Name/Title:
Reporting person
Date:
03/27/2026
Exhibit Information
EXHIBIT 99 - AGREEMENT REGARDING JOINT FILING OF STATEMENT ON SCHEDULE 13D OR 13G
Stonepine reports shared beneficial ownership of 4,025,992 shares, representing 9.9% of common stock based on 39,978,693 shares outstanding as of March 20, 2026. The position is reported as shared voting and dispositive power.
Does the filing include convertible instruments or warrants?
Yes. The filing discloses warrants to acquire 10,000,002 shares, but those warrants are subject to a 9.99% beneficial ownership limitation that constrains conversion impact on ownership percentages.
Who are the reporting persons on the Schedule 13G?
The filing lists Stonepine Capital Management, LLC; Stonepine Capital, L.P.; Stonepine GP, LLC; and Jon M. Plexico as the reporting persons, filing jointly while disclaiming group membership and certain direct beneficial ownership claims.
How was the percent ownership calculated?
The percent is calculated using 39,978,693 shares outstanding as of March 20, 2026, as cited from the issuer's Form 10-K for the fiscal year ended December 31, 2025, producing the reported 9.9% figure.
Does Stonepine report sole voting or dispositive power?
No. For each reporting person the filing reports 0 shares of sole voting or sole dispositive power and 4,025,992 shares of shared voting and shared dispositive power.
