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Form 3 Oncology Institute, Inc. For: Feb 23 Filed by: TZOUMAKAS KIMBERLY JO

March 20, 2026 4:34 PM
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
TZOUMAKAS KIMBERLY JO

(Last) (First) (Middle)
18000 STUDEBAKER ROAD,
SUITE 800

(Street)
CERRITOS CA 90703

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
02/23/2026
3. Issuer Name and Ticker or Trading Symbol
Oncology Institute, Inc. [ TOI ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
Remarks:
This Form 3, reporting an event occurring on February 23, 2026, is being filed late due to the reporting person's inability to obtain EDGAR access credentials prior to the applicable filing deadline, notwithstanding the initial submission of a completed Form ID application and related documents before such deadline. The reporting person is relying on the SEC Staff no-action position (Question 7, March 12, 2026), which provides relief for Section 16(a) filers who submitted a completed Form ID before a filing deadline falling between December 18, 2025 and March 18, 2026 but did not receive EDGAR access by the applicable filing deadline.
/s/ Mark Hueppelsheuser, Attorney-in-fact for Kimberly J. Tzoumakas 03/20/2026
** 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.

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