SEER Form 4: David Horn Sells 6,827 Shares Following RSU Vesting

Rhea-AI Filing Summary

Insider sale to cover taxes: This Form 4 shows David R. Horn, President & CFO of Seer, Inc. (SEER), sold 6,827 shares of Class A common stock on 08/20/2025 at a reported price of $2.0441 per share. The filing states the shares were sold to satisfy the reporting person’s tax obligations arising from the vesting of restricted stock units (RSUs). After the sale, Mr. Horn is reported to beneficially own 436,802 shares, held directly. The form is a single-person filing and includes the signer’s manual signature dated 08/21/2025.

Insights

Corporate Governance Expert

TL;DR: Routine tax-driven sale of vested RSUs by a named executive; not an unusual governance event.

The disclosure documents an open-market sale of 6,827 Class A shares executed to satisfy tax obligations tied to RSU vesting. Because the filing explicitly states the sale was tax-related and post-transaction beneficial ownership remains at 436,802 shares, this appears to be an administrative liquidity action rather than a signal of strategic change. No additional transfers, pledges, or derivative transactions are disclosed. The filing is straightforward and compliant with Section 16 reporting requirements.

Securities Analyst

TL;DR: Small-scale insider sale disclosed; limited immediate market or valuation impact.

The transaction quantity (6,827 shares) and price ($2.0441) are clearly stated and tied to tax withholding from RSU vesting. The remaining beneficial ownership of 436,802 shares provides context on the executive’s continued equity stake. There is no indication of additional sales or hedging arrangements. From a securities compliance and disclosure perspective, the report satisfies obligations and contains the necessary details for investor transparency.

Insider Trade Summary

Net Seller: 6,827 shares ($13,955)

Net Sell 1 txn

Insider Horn David R.

Role PRESIDENT & CFO

Sold 6,827 shs ($14K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	6,827	$2.0441	$14K

Holdings After Transaction: Class A Common Stock — 436,802 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Horn David R.

(Last) (First) (Middle)

C/O SEER, INC.

3800 BRIDGE PARKWAY, SUITE 102

(Street)

REDWOOD CITY CA 94065

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRESIDENT & CFO

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2025

4. 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 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
Class A Common Stock	08/20/2025		S(1)		6,827	D	$2.0441	436,802	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 (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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.

	/s/ David R. Horn	08/21/2025
	** 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.

FAQ

What transaction does the SEER Form 4 for David R. Horn report?

The form reports a sale of 6,827 Class A shares on 08/20/2025 at $2.0441 per share.

Why were the shares sold according to the filing?

The filing states the shares were sold to satisfy the reporting person’s tax obligations in connection with RSU vesting.

How many SEER shares does David R. Horn beneficially own after the transaction?

After the reported sale, he beneficially owns 436,802 shares (direct ownership).

What is David R. Horn’s role at Seer, Inc. as listed on the Form 4?

He is identified as President & CFO and the form indicates he filed as an individual reporting person.

When was the Form 4 signed?

The filing bears the reporting person’s signature dated 08/21/2025.