Ouster (NYSE: OUST) CTO sells 40K shares after option exercise

Rhea-AI Filing Summary

Ouster, Inc. Chief Technology Officer Mark Frichtl exercised stock options and sold shares in a pre-planned transaction. On March 25, 2026, he exercised 40,000 non-qualified stock options at an exercise price of $2.13 per share, receiving 40,000 shares of common stock.

That same day, he sold 40,000 common shares at a weighted-average price of $20.9394 per share in open-market transactions pursuant to a Rule 10b5-1 plan dated December 15, 2025, which the footnotes state included sales for tax planning purposes. After these transactions, he directly owned 636,882 common shares. The footnotes also note the options were fully vested and that the sale prices ranged from $20.53 to $21.30.

Insider Trade Summary 10b5-1

Net Seller: 40,000 shares ($837,576)

Net Sell 3 txns

Insider Frichtl Mark

Role Chief Technology Officer

Sold 40,000 shs ($838K)

Type	Security	Shares	Price	Value
Exercise	Non-Qualified Stock Option	40,000	$0.00	--
Exercise	Common Stock	40,000	$2.13	$85K
Sale	Common Stock	40,000	$20.9394	$838K

Holdings After Transaction: Non-Qualified Stock Option — 276,434 shares (Direct); Common Stock — 676,882 shares (Direct)

Footnotes (1)

1. Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025. Includes sales made for tax planning purposes. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.53 to $21.30. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The options are fully vested and exercisable.

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).

X

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^*

Frichtl Mark

(Last) (First) (Middle)

350 TREAT AVENUE

(Street)

SAN FRANCISCO CALIFORNIA 94110

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Ouster, Inc. [ OUST ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/25/2026

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
Common Stock	03/25/2026		M		40,000	A	$2.13	676,882	D
Common Stock	03/25/2026		S		40,000(1)	D	$20.9394(2)	636,882	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
Non-Qualified Stock Option	$2.13	03/25/2026		M			40,000	(3)	10/01/2030	Common Stock	40,000	$0.00	276,434	D

Explanation of Responses:

1. Reflects shares sold pursuant to a Rule 10b5-1 plan dated December 15, 2025. Includes sales made for tax planning purposes.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.53 to $21.30. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. The options are fully vested and exercisable.

	/s/ Megan Chung, as Attorney-in-Fact for Mark Frichtl	03/27/2026
	** 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)

FAQ

What did Ouster (OUST) CTO Mark Frichtl report in this Form 4?

Ouster CTO Mark Frichtl reported exercising 40,000 stock options at $2.13 and selling 40,000 common shares at a weighted-average price of $20.9394. After the transactions, he directly held 636,882 Ouster shares.

Was the Ouster (OUST) insider sale part of a Rule 10b5-1 plan?

Yes, the filing states the 40,000-share sale was made under a Rule 10b5-1 plan dated December 15, 2025. The footnote also explains that the trades included sales for tax planning purposes, indicating the activity was pre-planned rather than opportunistic.

How many Ouster (OUST) shares does the CTO own after these transactions?

Following the option exercise and related sale, Ouster’s CTO directly owns 636,882 shares of common stock. This figure in the filing reflects his direct holdings after exercising 40,000 options and selling 40,000 shares on March 25, 2026.

What prices were involved in the Ouster (OUST) CTO’s option exercise and share sale?

The CTO exercised options at an exercise price of $2.13 per share and sold the resulting 40,000 shares at a weighted-average price of $20.9394. A footnote notes sale prices ranged between $20.53 and $21.30 across multiple trades.

Were the Ouster (OUST) CTO’s stock options fully vested before exercise?

Yes. A footnote specifies that the non-qualified stock options exercised were fully vested and exercisable. On March 25, 2026, he exercised 40,000 options into common stock and then sold the same number of shares in open-market transactions.

Does this Ouster (OUST) Form 4 show any remaining derivative securities for the CTO?

In this filing, the derivativeSummary section is empty, indicating no remaining derivative positions are listed here after the 40,000-option exercise. The disclosed transactions focus on that single option exercise and the related sale of 40,000 common shares.