Nantahala reports 4.22M-share stake in Curis (9.99%)
Curis, Inc. ownership disclosure: Nantahala Capital Management, LLC and its managers report beneficial ownership of 4,215,165 shares of Curis Common Stock as of March 31, 2026.
Curis, Inc. ownership disclosure: Nantahala Capital Management, LLC and its managers report beneficial ownership of 4,215,165 shares of Curis Common Stock as of March 31, 2026. Each of the reporting persons — Nantahala, Wilmot B. Harkey and Daniel Mack — is shown as beneficial owner of 9.99% of the class based on a cited 2,215,165 shares outstanding figure from a Form 10-K filed March 27, 2026. The filing states the shares are held by funds and separately managed accounts under Nantahala’s control and that Nantahala and the two managers have shared voting and dispositive power over the 4,215,165 shares.
Positive
None.
Negative
None.
Insights
Large passive stake reported by an investment adviser and its managers.
The filing lists 4,215,165 shares held by funds and accounts under Nantahala’s control, with shared voting and dispositive power attributed to Nantahala and two managers as of March 31, 2026. The percentage cited is 9.99%, tied to a stated outstanding share count on a prior Form 10-K.
Reporting shows fund-level control, not direct individual ownership. Subsequent filings or issuer disclosures could clarify the apparent numerical mismatch between the quoted outstanding shares and the stake shown.
Schedule 13G/A filed by an investment adviser with required holder disclosures.
The filing identifies Nantahala Capital Partners LP and Blackwell Partners LLC — funds advised by Nantahala — as holders entitled to proceeds/dividends for over 5% of the shares reported. Signatures include the Chief Compliance Officer and the two managers, dated 04/07/2026.
Disclosure follows beneficial-ownership conventions for an adviser; monitor any future 13D/13G amendments if voting or acquisition intentions change.
Key Figures
Shares beneficially owned:4,215,165 sharesPercent of class:9.99%Shares outstanding (cited):2,215,165 shares+1 more
4 metrics
Shares beneficially owned4,215,165 sharesheld by funds and accounts under Nantahala control as of March 31, 2026
Percent of class9.99%percentage attributed to each Reporting Person based on cited outstanding count
Shares outstanding (cited)2,215,165 sharesfigure taken from issuer Form 10-K filed March 27, 2026 (used to compute percentage)
Filing date / signature date04/07/2026date signatures executed on the Schedule 13G/A
"As of March 31, 2026, Nantahala may be deemed to be the beneficial owner"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
shared dispositive powerregulatory
"Shared Dispositive Power 4,215,165.00"
Schedule 13G/Aregulatory
"Each of Messrs. Harkey and Mack is filing this as a control person"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
investment adviserregulatory
"Nantahala, an investment adviser as described in ss. 240.13d-1(b)(1)(ii)(E)"
An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What stake does Nantahala Capital report in Curis (CRIS)?
Nantahala reports beneficial ownership of 4,215,165 shares. The filing states this equals 9.99% of the class based on a cited 2,215,165 shares outstanding figure from a Form 10-K filed March 27, 2026.
Who are the reporting persons on the Schedule 13G/A for CRIS?
The reporting persons are Nantahala Capital Management, LLC and two managers, Wilmot B. Harkey and Daniel Mack, each shown as beneficial owners through their roles with Nantahala as of March 31, 2026.
What voting and dispositive powers are reported for the Curis shares?
The filing shows 0 sole voting/dispositive power and 4,215,165 shares of shared voting and shared dispositive power for Nantahala, Harkey, and Mack, indicating adviser-level shared control of those shares.
Which funds advised by Nantahala are identified with >5% rights?
The filing identifies Nantahala Capital Partners Limited Partnership and Blackwell Partners LLC - Series A as funds advised by Nantahala that have the right to receive dividends or sale proceeds for more than 5% of the reported shares.
When was the Schedule 13G/A signed and who signed it?
The filing shows signatures dated 04/07/2026 by Taki Vasilakis (Chief Compliance Officer), Wilmot B. Harkey (Manager), and Daniel Mack (Manager), certifying the disclosure.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
CURIS, INC.
(Name of Issuer)
Common Stock, Par Value $0.01 per share
(Title of Class of Securities)
231269309
(CUSIP Number)
03/31/2026
(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
Nantahala 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
MASSACHUSETTS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,215,165.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,215,165.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,215,165.00
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)
9.99 %
12
Type of Reporting Person (See Instructions)
IA, HC
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Wilmot B. Harkey
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
4,215,165.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,215,165.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,215,165.00
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)
9.99 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP Number(s):
231269309
1
Names of Reporting Persons
Daniel Mack
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
4,215,165.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,215,165.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,215,165.00
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)
9.99 %
12
Type of Reporting Person (See Instructions)
IN
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:
(1) Nantahala Capital Management, LLC ("Nantahala")
(2) Wilmot B. Harkey
(3) Daniel Mack (together the "Reporting Persons")
(b)
Address or principal business office or, if none, residence:
130 Main St. 2nd Floor, New Canaan, CT 06840
(c)
Citizenship:
(1) Nantahala is a Massachusetts limited liability company. (2) Each of Messrs. Harkey and Mack is a citizen of the United States of America.
(d)
Title of class of securities:
Common Stock, Par Value $0.01 per share
(e)
CUSIP No.:
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:
As of March 31, 2026, Nantahala may be deemed to be the beneficial owner of 4,215,165 Shares held by funds and separately managed accounts under its control, and as the managing members of Nantahala, each of Messrs. Harkey and Mack may be deemed to be a beneficial owner of those Shares
(b)
Percent of class:
As of March 31, 2026, each of the Reporting Persons may be deemed to be the beneficial owner of the following percentage of the total number of Shares outstanding based on 2,215,165 shares outstanding received from the issuer on Form 10-K filed on March 27, 2026:
(1) Nantahala Capital Management, LLC ("Nantahala") : 9.99%
(2) Wilmot B. Harkey: 9.99%
(3) Daniel Mack: 9.99 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
(1) Nantahala Capital Management, LLC ("Nantahala") : 0 Shares.
(2) Wilmot B. Harkey: 0 Shares.
(3) Daniel Mack: 0 Shares.
(ii) Shared power to vote or to direct the vote:
(1) Nantahala Capital Management, LLC ("Nantahala") : 4,215,165 Shares.
(2) Wilmot B. Harkey: 4,215,165 Shares.
(3) Daniel Mack: 4,215,165 Shares.
(iii) Sole power to dispose or to direct the disposition of:
(1) Nantahala Capital Management, LLC ("Nantahala") : 0 Shares.
(2) Wilmot B. Harkey: 0 Shares.
(3) Daniel Mack: 0 Shares.
(iv) Shared power to dispose or to direct the disposition of:
(1) Nantahala Capital Management, LLC ("Nantahala") : 4,215,165 Shares.
(2) Wilmot B. Harkey: 4,215,165 Shares.
(3) Daniel Mack: 4,215,165 Shares.
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.
NANTAHALA CAPITAL PARTNERS LIMITED PARTNERSHIP, a fund advised by Nantahala, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of more than five percent of the outstanding shares of common stock beneficially owned by Nantahala reported herein. BLACKWELL PARTNERS LLC - SERIES A, a fund advised by Nantahala, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of more than five percent of the outstanding shares of common stock beneficially owned by Nantahala reported herein.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Each of Messrs. Harkey and Mack is filing this Schedule 13G as a control person in respect of shares beneficially owned by Nantahala, an investment adviser as described in ss. 240.13d-1(b)(1)(ii)(E). See Item 4(a).
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 acquired and are held in the ordinary course of business and 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.
