Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Black Jeffrey G. 2. Issuer Name and Ticker or Trading Symbol EXAGEN INC. [XGN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) C/O EXAGEN INC., 1261 LIBERTY WAY 3. Date of Earliest Transaction (Month/Day/Year) 03/12/2026 (Street) VISTA, CA 92081 4. If Amendment, Date 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 (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 03/12/2026 A(1) 75,000 A $3.16 342,442 D Common Stock(2) 02/27/2026 A V 1,511(3) A $3.077 343,953 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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)

$3.16

03/12/2026

A

50,000

(4)

03/11/2036

Common Stock

50,000

$3.16

60,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Black Jeffrey G. C/O EXAGEN INC. 1261 LIBERTY WAY VISTA, CA 92081			Chief Financial Officer

Signatures

/s/ Jeffrey G. Black		03/16/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The securities awarded are in the form of restricted stock units under the issuer's 2019 Incentive Award Plan. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. The restricted stock unit will vest with respect to 25% of the restricted stock units on each of the first, second, third and fourth anniversaries of February 21, 2026, subject to the Reporting Person's continued service through the applicable vesting date. In addition, the award may become fully vested upon a qualifying termination of employment in connection with a change in control.
(2)	The reporting person is voluntarily reporting the acquisition of the Issuer's common stock pursuant to the Employee Stock Purchase Plan ("ESPP").
(3)	Represents shares of common stock purchased through ESPP in transactions that were exempt under both Rule 16b-3(d) and Rule 16b-3(c).
(4)	The option is exercisable as it vests. 25% of the shares subject to the option vest on February 21, 2027, and 1/48th of the total number of shares subject to the option vest at the end of each calendar month thereafter, subject to the Reporting Person's continued service to the Issuer through each such vesting date. In addition, the stock option may become fully vested upon a qualifying termination of employment in connection with a change in control.

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