Sec Form 3 Filing - Helix Partners Management LP @ OFFICE PROPERTIES INCOME TRUST - 2026-06-17

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Helix Partners Management LP 2. Issuer Name and Ticker or Trading Symbol OFFICE PROPERTIES INCOME TRUST [ OPI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 545 MADISON AVENUE, 8TH FLOOR, 3. Date of Earliest Transaction (MM/DD/YY) 06/17/2026 (Street) NEW YORK, NY10022 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 Shares of Beneficial Interest 2,064,837 I See footnotes ( 1 ) ( 2 ) ( 4 ) Common Shares of Beneficial Interest 3,486,866 I See footnotes ( 1 ) ( 3 ) ( 4 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Warrants (right to buy) $ 25 06/17/2026 06/17/2033 Common Shares of Beneficial Interest 13,314 I See footnotes ( 1 ) ( 3 ) ( 4 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Helix Partners Management LP 545 MADISON AVENUE, 8TH FLOOR NEW YORK, NY10022 X Helix Strategic Fund LP WALKERS CORPORATE LIMITED, 190 ELGIN AVENUE GEORGE TOWN, GRAND CAYMANKY1-9008 X Helix Strategic Fund II LLC 545 MADISON AVENUE, 8TH FLOOR NEW YORK, NY10022 X Heller Jonathan M 545 MADISON AVENUE, 8TH FLOOR NEW YORK, NY10022 X X Signatures Helix Partners Management LP, By :/s/ Samuel Jed Rubin, Chief Operating/Compliance Officer 06/25/2026 Signature of Reporting Person Date Helix Strategic Fund LP, By :/s/ Samuel Jed Rubin, Authorized Signatory 06/25/2026 Signature of Reporting Person Date Helix Strategic Fund II LLC, By :/s/ Samuel Jed Rubin, Authorized Signatory 06/25/2026 Signature of Reporting Person Date /s/ Jonathan M. Heller 06/25/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 3 is being filed jointly by Helix Partners Management LLP, a Delaware limited partnership ("Helix Partners"), Helix Strategic Fund LP, a Cayman Islands exempted limited partnership ("Helix Strategic Fund"), Helix Strategic Fund II LLC, a Delaware limited liability company ("Helix Strategic Fund II," and together with Helix Strategic Fund, the "Helix Funds"), and Jonathan M. Heller, a citizen of the United States of America (collectively, the "Reporting Persons"), each of whom may be deemed to have a pecuniary interest in securities reported on this Form 3 (the "Subject Securities"). The business address of Helix Partners, Helix Strategic Fund II, and Mr. Heller is 545 Madison Avenue, 8th Floor, New York, NY 10022, and the business address of Helix Strategic Fund is Walkers Corporate Limited, 190 Elgin Avenue, George Town, Grand Cayman KY1-9008, Cayman Islands. ( 2 )These Subject Securities are held directly by Helix Strategic Fund. ( 3 )These Subject Securities are held directly by Helix Strategic Fund II. ( 4 )Each of (a) Helix Partners, as the investment advisor to the Helix Funds with respect to the Subject Securities held by the Helix Funds and (b) Mr. Heller, as the Chief Executive Officer of Helix Partners, may be deemed to be the beneficial owner of the Subject Securities for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each Reporting Person disclaims any beneficial ownership of the Subject Securities, except to the extent of any pecuniary interest therein.

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).

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