Seer CFO sells 7,303 shares to cover RSU taxes

Seer, Inc. President & CFO David R. Horn reported an open-market sale of 7,303 shares of Class A Common Stock at an average price of $1.6913 per share.

Rhea-AI Filing Summary

Seer, Inc. President & CFO David R. Horn reported an open-market sale of 7,303 shares of Class A Common Stock at an average price of $1.6913 per share. According to the filing, the shares were sold to satisfy his tax obligations related to vesting restricted stock units, and he held 493,959 shares directly after the transaction.

Insights

Equity compensation analyst

Small insider sale driven by tax obligations on RSU vesting.

Seer, Inc. President & CFO David R. Horn sold 7,303 Class A shares at $1.6913 each. A footnote explains the sale was made to cover his tax obligations from vesting restricted stock units, making this a compensation-related liquidity event rather than a discretionary portfolio move.

After the sale, he still directly owned 493,959 shares, so the disposed amount appears small relative to his remaining stake. Because the transaction is tied to RSU vesting and does not change derivative positions, it looks like a routine administrative sale with limited informational value about his view of the company.

Insider Trade Summary

Net Seller: 7,303 shares

Net Sell 1 txn

Insider Horn David R.

Role PRESIDENT & CFO

Sold 7,303 shs ($12K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	7,303	$1.6913	$12K

Holdings After Transaction: Class A Common Stock — 493,959 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: 7,303 shares Sale price per share: $1.6913 per share Shares owned after sale: 493,959 shares +1 more

4 metrics

Shares sold 7,303 shares Open-market sale on 2026-05-20

Sale price per share $1.6913 per share Average price for 7,303 shares sold

Shares owned after sale 493,959 shares Direct ownership following the transaction

Net shares sold 7,303 shares Net-sell direction in transaction summary

Key Terms

restricted stock units, open-market sale, tax obligations

3 terms

restricted stock units financial

"in connection with the vesting of restricted stock units, or RSUs"

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

tax obligations financial

"sold to satisfy the reporting person's tax obligations in connection"

FAQ

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

What insider transaction did Seer (SEER) report for its President & CFO?

Seer reported that President & CFO David R. Horn sold 7,303 shares of Class A Common Stock. The shares were sold in an open-market transaction at an average price of $1.6913 per share, according to a Form 4 insider trading report filed with regulators.

Why did Seer (SEER) executive David R. Horn sell 7,303 shares?

The shares were sold to satisfy David R. Horn’s tax obligations related to vesting restricted stock units. The filing notes that this tax-driven sale followed RSU vesting, indicating the transaction is part of routine equity compensation administration rather than a discretionary share sale.

How many Seer (SEER) shares does David R. Horn hold after the reported sale?

Following the 7,303-share sale, David R. Horn directly owned 493,959 shares of Seer’s Class A Common Stock. This figure, disclosed in the Form 4, shows that the sold amount is relatively small compared with his remaining direct ownership position in the company.

What price did Seer (SEER) insider David R. Horn receive for the shares sold?

The reported sale price was an average of $1.6913 per share for 7,303 shares of Class A Common Stock. This price information comes from the Form 4 filing, which itemizes the transaction date, share quantity, and per-share sale price for the open-market trade.

Is the Seer (SEER) insider sale by the President & CFO a routine tax transaction?

The filing states the 7,303 shares were sold to cover tax obligations tied to restricted stock unit vesting. Such sales are typically routine for executives receiving stock-based compensation, as they often dispose of a portion of shares to pay required income and payroll taxes.

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

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Accepted by SEC EDGAR 05/21/2026 - 05:12 PM EDT 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)
05/20/2026

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	05/20/2026		S(1)		7,303	D	$1.6913	493,959	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	05/21/2026
	** 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)