Seer CFO sells $14.8K in stock for tax payment

Seer, Inc. (SEER) reported that its President & CFO, David R. Horn, sold 7,309 shares of Class A Common Stock on 2026-08-18 at an average price of $2.0262 per share.

Rhea-AI Filing Summary

Seer, Inc. (SEER) reported that its President & CFO, David R. Horn, sold 7,309 shares of Class A Common Stock on 2026-08-18 at an average price of $2.0262 per share. According to the company’s disclosure, the shares were sold to satisfy Mr. Horn’s tax obligations related to vesting of restricted stock units. Following this sale, he directly holds 486,650 shares of Seer Class A Common Stock.

Insider Trade Summary

Net Seller: 7,309 shares

Net Sell 1 txn

Insider Horn David R.

Role PRESIDENT & CFO

Sold 7,309 shs ($15K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1	7,309	$2.0262	$15K

Holdings After Transaction: Class A Common Stock — 486,650 shares (Direct)

Footnotes (1)

1. F1. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.

Key Figures

Shares sold: 7,309 shares Sale price per share: $2.0262 per share Shares held after transaction: 486,650 shares

3 metrics

Shares sold 7,309 shares Class A Common Stock sale on 2026-08-18 by President & CFO

Sale price per share $2.0262 per share Average price for the 7,309-share sale on 2026-08-18

Shares held after transaction 486,650 shares Direct Class A Common Stock holdings of David R. Horn after sale

Key Terms

restricted stock units, vesting, tax obligations

3 terms

restricted stock units financial

"tax obligations in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting financial

"tax obligations in connection with the vesting of restricted stock units"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

tax obligations financial

"shares were sold to satisfy the reporting person's tax obligations"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Seer, Inc. (SEER) disclose for David R. Horn?

Seer, Inc. disclosed that President & CFO David R. Horn sold 7,309 SEER shares on 2026-08-18. The sale was reported as a disposition of Class A Common Stock in an open market or private transaction at an average price of $2.0262 per share.

Why did Seer’s President & CFO sell 7,309 SEER shares?

The 7,309 SEER shares were sold to satisfy tax obligations related to the vesting of restricted stock units (RSUs). The company’s note clarifies this sale was tied to tax withholding on equity compensation rather than a discretionary portfolio reallocation.

At what price were the 7,309 SEER shares sold by David R. Horn?

The 7,309 SEER shares were sold at an average price of $2.0262 per share. This price reflects a sale in an open market or private transaction as characterized in the disclosure, resulting in total proceeds of approximately $14,800 before any costs or taxes.

How many SEER shares does David R. Horn hold after this reported sale?

After the reported sale, David R. Horn directly holds 486,650 shares of Seer, Inc. Class A Common Stock. This post-transaction holding figure comes from the company’s Form 4 disclosure and reflects only his reported direct ownership position following the tax-related sale.

Was the SEER insider sale made under a Rule 10b5-1 trading plan?

The disclosure indicates the Rule 10b5-1 checkbox was not marked, and there is no footnote stating the sale was under a trading plan. The transaction is instead described as a sale to cover tax obligations from vesting RSUs, without reference to a pre-arranged plan.

What role does David R. Horn hold at Seer, Inc. (SEER)?

David R. Horn serves as President & Chief Financial Officer of Seer, Inc. This means he is both the company’s top financial executive and a senior operating leader, and his equity transactions are reported as insider trades under SEC rules for officers.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/19/2026 - 06:59 PM Accepted by SEC EDGAR 08/19/2026 - 06:59 PM Learn about SEC filing dates

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 CALIFORNIA 94065

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	08/18/2026		S(1)		7,309	D	$2.0262	486,650	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	08/19/2026
	** 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.
* Form 4: SEC 1474 (03-26)