Ouster (OUST) counsel’s 9,593-share sale covers RSU tax under 10b5-1

Rhea-AI Filing Summary

Ouster, Inc. reported that its General Counsel and Secretary, Megan Chung, sold 9,593 shares of common stock on March 12, 2026 at a weighted average price of $23.4324 per share. According to the disclosure, these shares were sold solely to cover withholding taxes due upon the vesting and settlement of restricted stock units, pursuant to a Rule 10b5-1 sale-to-cover instruction letter dated August 20, 2025. After this tax-related sale, Chung directly holds 173,548 shares of Ouster common stock.

Insider Trade Summary 10b5-1

Net Seller: 9,593 shares ($224,787)

Net Sell 1 txn

Insider Chung Megan

Role General Counsel and Secretary

Sold 9,593 shs ($225K)

Type	Security	Shares	Price	Value
Sale	Common Stock	9,593	$23.4324	$225K

Holdings After Transaction: Common Stock — 173,548 shares (Direct)

Footnotes (1)

1. Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units pursuant to a Rule 10b5-1 sale to cover instruction letter dated August 20, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.9705 to $23.4522. 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.

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^*

Chung Megan

(Last) (First) (Middle)

350 TREAT AVENUE

(Street)

SAN FRANCISCO CA 94110

(City) (State) (Zip)

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)
	General Counsel and Secretary

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

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
Common Stock	03/12/2026		S		9,593(1)	D	$23.4324(2)	173,548	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. Reflects shares sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units pursuant to a Rule 10b5-1 sale to cover instruction letter dated August 20, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.9705 to $23.4522. 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.

	/s/ Megan Chung	03/16/2026
	** 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.

FAQ

What insider transaction did Ouster (OUST) disclose for Megan Chung?

Ouster disclosed that General Counsel and Secretary Megan Chung sold 9,593 shares of common stock. The transaction occurred on March 12, 2026 and was reported as an open-market sale at a weighted average price of $23.4324 per share.

Why did Ouster (OUST) executive Megan Chung sell 9,593 shares?

The 9,593 shares were sold to cover withholding taxes triggered by the vesting and settlement of restricted stock units. The filing states this was done under a Rule 10b5-1 sale-to-cover instruction letter dated August 20, 2025.

At what price were the Ouster (OUST) shares sold by Megan Chung?

The filing reports a weighted average price of $23.4324 per share. Footnotes explain the shares were sold in multiple trades at prices ranging from $22.9705 to $23.4522, with full trade-by-trade details available upon request.

How many Ouster (OUST) shares does Megan Chung hold after the sale?

Following the tax-related sale, Megan Chung directly holds 173,548 shares of Ouster common stock. This post-transaction holding figure is disclosed in the Form 4 and shows she retains a substantial equity position after covering the RSU tax obligation.

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

Yes. The footnotes state the sale was executed pursuant to a Rule 10b5-1 sale-to-cover instruction letter dated August 20, 2025. Such plans pre-arrange trades, indicating this transaction was a pre-planned tax withholding event.