SEC FORM 3

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SEC Form 3

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^*

Endweiss Charles

(Last)

(First)

(Middle)

C/O SEER, INC.

3800 BRIDGE PARKWAY, SUITE 102

(Street)

REDWOOD CITY

94065

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2026

3. Issuer Name and Ticker or Trading Symbol
Seer, Inc. [ SEER ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	VP Financial Planning Analysis

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)
Common Stock	107,641⁽¹⁾	D
Common Stock	141	I	See footnote⁽²⁾
Common Stock	175	I	See footnote⁽³⁾

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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Employee Stock Option (right to buy)	⁽⁴⁾	01/06/2031	Common Stock	46,730	$2	D
Employee Stock Option (right to buy)	⁽⁴⁾	09/01/2031	Common Stock	10,578	$2	D
Employee Stock Option (right to buy)	⁽⁴⁾	02/08/2032	Common Stock	15,000	$2	D
Employee Stock Option (right to buy)	⁽⁵⁾	02/15/2033	Common Stock	21,250	$2	D
Employee Stock Option (right to buy)	⁽⁶⁾	02/06/2034	Common Stock	21,250	$1.77	D
Employee Stock Option (right to buy)	⁽⁷⁾	02/06/2035	Common Stock	21,250	$2.33	D
Employee Stock Option (right to buy)	⁽⁸⁾	02/03/2036	Common Stock	14,000	$1.79	D

Explanation of Responses:

1. Includes 43,149 shares represented by restricted stock units, or RSUs, which vest as follows: 2,656 RSUs vest in two equal quarterly installments beginning on November 15, 2026; 6,995 RSUs vest in six equal quarterly installments beginning on November 15, 2026; 7,968 RSUs vest in seven equal quarterly installments beginning on November 15, 2026; 13,280 RSUs vest in 10 equal quarterly installments beginning on November 15, 2026; and 12,250 RSUs vest in 14 equal installments beginning on November 15, 2026.

2. The shares are held in a custodial account for the reporting person's elder son.

3. The shares are held in a custodial account for the reporting person's younger son.

4. The shares underlying the option are fully vested are immediately exercisable.

5. One-fourth of the shares underlying the option vested on February 7, 2024 and the remaining shares vest in 36 equal monthly installments thereafter.

6. One-fourth of the shares underlying the option vested on February 6, 2025 and the remaining shares vest in 36 equal monthly installments thereafter.

7. One-fourth of the shares underlying the option vested on February 6, 2026 and the remaining shares vest in 36 equal monthly installments thereafter.

8. One-fourth of the shares underlying the option vest on February 3, 2027 and the remaining shares vest in 36 equal monthly installments thereafter.

Remarks:

Exhibit 24.1 - Power of Attorney

	/s/ Charles Endweiss	10/08/2026
	** 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 5 (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.