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Xilio Therapeutics, Inc. (XLO) common stock is covered by an amended ownership report: Coastlands Capital LP, Coastlands Capital Partners LP, Coastlands Capital GP LLC, Coastlands Capital LLC and Matthew D. Perry each report shared beneficial ownership of 731,573 shares, or 9.99%. The amount includes common shares and shares issuable upon exercise of pre-funded warrants. Each reports shared voting and dispositive power, with no sole voting or dispositive power.
The ownership calculation uses 7,063,982 shares outstanding as of November 6, 2026, plus shares issuable upon exercise of pre-funded warrants, subject to a 9.99% beneficial ownership limitation. The reporting persons say the amendment reflects Xilio's reverse stock split and transactions in common stock.
Key Figures
Beneficial ownership reported by each reporting person:731,573 sharesReported percentage of class:9.99%Common shares outstanding:7,063,982 shares+1 more
4 metrics
Beneficial ownership reported by each reporting person731,573 sharesShared beneficial ownership of Xilio common stock
Reported percentage of class9.99%Percentage represented by the reported beneficial ownership
Common shares outstanding7,063,982 sharesAs of November 6, 2026; basis for the ownership calculation, plus shares issuable upon exercise of pre-funded warrants
Beneficial ownership limitation for warrants4.99%Limit for warrants, as distinguished from the 9.99% limit for pre-funded warrants
Key Terms
pre-funded warrants, beneficial ownership limitation, shared dispositive power
3 terms
pre-funded warrantstechnical
"shares of Common Stock issuable upon the exercise of pre-funded warrants"
Pre-funded warrants are financial instruments that give investors the right to purchase a company's stock at a set price, but with most or all of the purchase price paid upfront. They function like a coupon or gift card for stock, allowing investors to buy shares later at a fixed price, which can be beneficial if they want to avoid future price increases. This makes them important for investors seeking flexibility and certainty in their investment plans.
beneficial ownership limitationregulatory
"subject to the beneficial ownership limitation of 9.99%"
A beneficial ownership limitation is a rule that caps the percentage of a company’s shares an investor can be treated as owning or controlling for voting, regulatory or tax purposes. It matters to investors because it can restrict how many shares a person or group can buy or vote, affect takeover chances, and influence share liquidity and value — like a speed limit that prevents any single driver from taking over the whole road.
shared dispositive powerregulatory
"Shared Dispositive Power 731,573.00"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many XLO shares do Coastlands and Matthew D. Perry report owning?
Each of the five reporting persons reports 731,573 shares of Xilio common stock, representing 9.99% of the class. The reported amount is shared among the reporting persons and is not five separate holdings.
How is the reported XLO ownership percentage calculated?
The calculation uses 7,063,982 shares outstanding as of November 6, 2026, plus shares issuable upon exercise of pre-funded warrants, subject to a 9.99% beneficial ownership limitation. The reporting persons exclude shares issuable under pre-funded warrants and warrants above the respective 9.99% and 4.99% beneficial ownership limitations.
Who holds the XLO shares for the benefit of investors?
Coastlands Capital Partners LP holds the common stock, including shares issuable upon exercise of pre-funded warrants and warrants, for the benefit of its investors. It has the right to receive or direct the receipt of dividends and sale proceeds from those shares.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
Xilio Therapeutics, Inc.
(Name of Issuer)
Common Stock, par value $0.0001 per share
(Title of Class of Securities)
98422T209
(CUSIP Number)
09/30/2026
(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):
98422T209
1
Names of Reporting Persons
Coastlands Capital LP
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
731,573.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
731,573.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
731,573.00
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, PN
Comment for Type of Reporting Person: Consists of shares of Common Stock, including shares of Common Stock issuable upon the exercise of pre-funded warrants, held directly by Coastlands Capital Partners LP. The calculation of the beneficial ownership of the Reporting Persons is based on 7,063,982 shares of Common Stock outstanding as of November 6, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on November 10, 2026, plus the shares of Common Stock issuable upon the exercise of pre-funded warrants held by the Reporting Persons, subject to the beneficial ownership limitation of 9.99%. Excludes shares of Common Stock issuable upon the exercise of pre-funded warrants and warrants held by the Reporting Persons in excess of the beneficial ownership limitations of 9.99% and 4.99%, respectively.
This Amendment No. 1 to Schedule 13G is being filed to reflect the Issuer's reverse stock split and transactions in Common Stock.
SCHEDULE 13G
CUSIP Number(s):
98422T209
1
Names of Reporting Persons
Coastlands Capital Partners LP
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
731,573.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
731,573.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
731,573.00
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)
PN
Comment for Type of Reporting Person: Consists of shares of Common Stock, including shares of Common Stock issuable upon the exercise of pre-funded warrants, held directly by Coastlands Capital Partners LP. The calculation of the beneficial ownership of the Reporting Persons is based on 7,063,982 shares of Common Stock outstanding as of November 6, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on November 10, 2026, plus the shares of Common Stock issuable upon the exercise of pre-funded warrants held by the Reporting Persons, subject to the beneficial ownership limitation of 9.99%. Excludes shares of Common Stock issuable upon the exercise of pre-funded warrants and warrants held by the Reporting Persons in excess of the beneficial ownership limitations of 9.99% and 4.99%, respectively.
This Amendment No. 1 to Schedule 13G is being filed to reflect the Issuer's reverse stock split and transactions in Common Stock.
SCHEDULE 13G
CUSIP Number(s):
98422T209
1
Names of Reporting Persons
Coastlands Capital 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
731,573.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
731,573.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
731,573.00
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)
OO
Comment for Type of Reporting Person: Consists of shares of Common Stock, including shares of Common Stock issuable upon the exercise of pre-funded warrants, held directly by Coastlands Capital Partners LP. The calculation of the beneficial ownership of the Reporting Persons is based on 7,063,982 shares of Common Stock outstanding as of November 6, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on November 10, 2026, plus the shares of Common Stock issuable upon the exercise of pre-funded warrants held by the Reporting Persons, subject to the beneficial ownership limitation of 9.99%. Excludes shares of Common Stock issuable upon the exercise of pre-funded warrants and warrants held by the Reporting Persons in excess of the beneficial ownership limitations of 9.99% and 4.99%, respectively.
This Amendment No. 1 to Schedule 13G is being filed to reflect the Issuer's reverse stock split and transactions in Common Stock.
SCHEDULE 13G
CUSIP Number(s):
98422T209
1
Names of Reporting Persons
Coastlands Capital 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
731,573.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
731,573.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
731,573.00
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)
HC, OO
Comment for Type of Reporting Person: Consists of shares of Common Stock, including shares of Common Stock issuable upon the exercise of pre-funded warrants, held directly by Coastlands Capital Partners LP. The calculation of the beneficial ownership of the Reporting Persons is based on 7,063,982 shares of Common Stock outstanding as of November 6, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on November 10, 2026, plus the shares of Common Stock issuable upon the exercise of pre-funded warrants held by the Reporting Persons, subject to the beneficial ownership limitation of 9.99%. Excludes shares of Common Stock issuable upon the exercise of pre-funded warrants and warrants held by the Reporting Persons in excess of the beneficial ownership limitations of 9.99% and 4.99%, respectively.
This Amendment No. 1 to Schedule 13G is being filed to reflect the Issuer's reverse stock split and transactions in Common Stock.
SCHEDULE 13G
CUSIP Number(s):
98422T209
1
Names of Reporting Persons
Matthew D. Perry
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
731,573.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
731,573.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
731,573.00
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)
HC, IN
Comment for Type of Reporting Person: Consists of shares of Common Stock, including shares of Common Stock issuable upon the exercise of pre-funded warrants, held directly by Coastlands Capital Partners LP. The calculation of the beneficial ownership of the Reporting Persons is based on 7,063,982 shares of Common Stock outstanding as of November 6, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on November 10, 2026, plus the shares of Common Stock issuable upon the exercise of pre-funded warrants held by the Reporting Persons, subject to the beneficial ownership limitation of 9.99%. Excludes shares of Common Stock issuable upon the exercise of pre-funded warrants and warrants held by the Reporting Persons in excess of the beneficial ownership limitations of 9.99% and 4.99%, respectively.
This Amendment No. 1 to Schedule 13G is being filed to reflect the Issuer's reverse stock split and transactions in Common Stock.
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Xilio Therapeutics, Inc.
(b)
Address of issuer's principal executive offices:
828 Winter Street, Suite 300, Waltham, MA 02451
Item 2.
(a)
Name of person filing:
Coastlands Capital LP, a Delaware limited partnership ("Coastlands")
Coastlands Capital Partners LP, a Delaware limited partnership (the "Partnership")
Coastlands Capital GP LLC, a Delaware limited liability company (the "General Partner")
Coastlands Capital LLC, a Delaware limited liability company ("Coastlands GP")
Matthew D. Perry
Coastlands and the General Partner are the investment adviser and general partner, respectively, of the Partnership. Coastlands GP is the general partner of Coastlands. Mr. Perry is the control person of Coastlands, the Partnership, Coastlands GP 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 Common Stock 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 Common Stock covered by this Schedule 13G.
(b)
Address or principal business office or, if none, residence:
601 California Street, Suite 1210, San Francisco, CA 94108
(c)
Citizenship:
See Item 4 of the cover sheet for each reporting person.
(d)
Title of class of securities:
Common Stock, par value $0.0001 per share
(e)
CUSIP No.:
98422T209
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:
Coastlands: 731,573
Partnership: 731,573
General Partner: 731,573
Coastlands GP: 731,573
Matthew D. Perry: 731,573
(b)
Percent of class:
Coastlands: 9.99%
Partnership: 9.99%
General Partner: 9.99%
Coastlands GP: 9.99%
Matthew D. Perry: 9.99%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
Coastlands: 0
Partnership: 0
General Partner: 0
Coastlands GP: 0
Matthew D. Perry: 0
(ii) Shared power to vote or to direct the vote:
Coastlands: 731,573
Partnership: 731,573
General Partner: 731,573
Coastlands GP: 731,573
Matthew D. Perry: 731,573
(iii) Sole power to dispose or to direct the disposition of:
Coastlands: 0
Partnership: 0
General Partner: 0
Coastlands GP: 0
Matthew D. Perry: 0
(iv) Shared power to dispose or to direct the disposition of:
Coastlands: 731,573
Partnership: 731,573
General Partner: 731,573
Coastlands GP: 731,573
Matthew D. Perry: 731,573
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 the shares of Common Stock, including shares of Common Stock issuable upon exercise of pre-funded warrants and shares of Common Stock issuable upon exercise of warrants, 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 of Common Stock, including shares of Common Stock issuable upon exercise of pre-funded warrants and shares of Common Stock issuable upon exercise of warrants.
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 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.
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.
Coastlands Capital LP
Signature:
/s/ Mark Shamia
Name/Title:
Chief Operating Officer of the General Partner, Coastlands Capital LLC
Date:
11/13/2026
Coastlands Capital Partners LP
Signature:
/s/ Mark Shamia
Name/Title:
Chief Operating Officer of the General Partner, Coastlands Capital GP LLC
Date:
11/13/2026
Coastlands Capital GP LLC
Signature:
/s/ Mark Shamia
Name/Title:
Chief Operating Officer
Date:
11/13/2026
Coastlands Capital LLC
Signature:
/s/ Mark Shamia
Name/Title:
Chief Operating Officer
Date:
11/13/2026
Matthew D. Perry
Signature:
/s/ Matthew D. Perry
Name/Title:
Reporting Person
Date:
11/13/2026
Exhibit Information
Exhibit 99.1 - Agreement Regarding Joint Filing of Statement on Schedule 13D or 13G (incorporated by reference to the Schedule 13G filed on December 11, 2025).
