Sec Form 3 Filing - Realov Christo Dimitrov @ Jefferson Capital, Inc. / DE - 2025-06-26

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 Realov Christo Dimitrov 2. Issuer Name and Ticker or Trading Symbol Jefferson Capital, Inc. / DE [ JCAP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SEE REMARKS (Last) (First) (Middle) C/O JEFFERSON CAPITAL, INC., 600 SOUTH HIGHWAY 169, SUITE 1575 3. Date of Earliest Transaction (MM/DD/YY) 06/26/2025 (Street) MINNEAPOLIS, MN55426 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 Stock ( 1 ) 107,881 D

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 Stock Option (right to buy) $ 17.53 ( 3 ) ( 2 ) 06/25/2035 Common Stock 51,758 D Stock Option (right to buy) $ 23.57 ( 3 ) ( 2 ) 06/25/2035 Common Stock 51,758 D Stock Option (right to buy) $ 29.61 ( 3 ) ( 2 ) 06/25/2035 Common Stock 51,758 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Realov Christo Dimitrov C/O JEFFERSON CAPITAL, INC. 600 SOUTH HIGHWAY 169, SUITE 1575 MINNEAPOLIS, MN55426 SEE REMARKS Signatures /s/ Matthew J. Pfohl, as Attorney-in-Fact, for Christo Dimitrov Realov 06/26/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes (i) 17,906 shares of restricted common stock that are subject to forfeiture and vest as to 8,953 shares on each of September 7, 2025 and September 7, 2026, (ii) 9,173 shares of restricted common stock that are subject to forfeiture and vest as to 1/5th of the shares on each of December 12, 2025, 2026, 2027, 2028 and 2029, and (iii) 53,942 shares of restricted common stock that are subject to forfeiture and vest as to 1/3rd of the shares on each anniversary for three years from the June 25, 2025 grant date, in each case, subject to continued service through the vest date. ( 2 )The stock options vests as to 1/5th of the shares on each of December 12, 2025, 2026, 2027, 2028 and 2029, subject to continued service through the vest date. ( 3 )Determined based on the distribution threshold of certain Class B units, as adjusted for distributions paid per unit since grant date, that were cancelled in the Reorganization (described in the Registration Statement on Form S-1, as amended, filed with the Securities and Exchange Commission on June 13, 2025) multiplied by the exchange ratio for the Reorganization.

Remarks: Officer Title: Chief Financial Officer and Treasurer. Exhibit List: Exhibit 24.1 - Power of Attorney

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