Ouster (OUST) director Tewksbury sells 1,695 shares under 10b5-1 plan

Rhea-AI Filing Summary

Ouster, Inc. director Ted L. Tewksbury III reported an open-market sale of 1,695 shares of common stock at $20.00 per share on March 19, 2026. After this transaction, he directly owns 121,969 shares of Ouster common stock.

According to a footnote, the sale was made under a pre-arranged Rule 10b5-1 trading plan dated August 12, 2025 and includes activity for tax planning purposes. The transaction represents a relatively small portion of his overall reported holdings.

Insider Trade Summary 10b5-1

Net Seller: 1,695 shares ($33,900)

Net Sell 1 txn

Insider Tewksbury Ted L III

Role Director

Sold 1,695 shs ($34K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,695	$20.00	$34K

Holdings After Transaction: Common Stock — 121,969 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).

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^*

Tewksbury Ted L III

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

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	03/19/2026		S		1,695(1)	D	$20	121,969	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 pursuant to a Rule 10b5-1 plan dated August 12, 2025. Includes sales made for tax planning purposes.

	/s/ Megan Chung, as Attorney-in-Fact for Ted L. Tewksbury III	03/23/2026
	** 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) director Ted L. Tewksbury III report in this Form 4?

He reported an open-market sale of 1,695 shares of Ouster common stock at $20.00 per share. This SEC filing discloses the transaction details and his updated ownership position following the sale.

How many Ouster (OUST) shares did the director sell and at what price?

He sold 1,695 shares of Ouster common stock at a price of $20.00 per share. The transaction was reported as a non-derivative, open-market sale under SEC Form 4 requirements.

How many Ouster (OUST) shares does the director hold after this transaction?

Following the sale, Ted L. Tewksbury III directly holds 121,969 shares of Ouster common stock. This post-transaction ownership figure is reported in the Form 4 as his remaining direct stake.

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

Yes. A footnote states the shares were sold pursuant to a Rule 10b5-1 plan dated August 12, 2025. Such plans are pre-arranged trading programs that can make transactions more routine and less timing-driven.

What reason is given for the Ouster (OUST) director’s share sale?

The footnote explains that the sales include activity made for tax planning purposes. This indicates at least part of the transaction relates to managing tax obligations rather than solely discretionary trading decisions.

Does this Ouster (OUST) Form 4 involve any derivative securities or option exercises?

No. The reported transaction involves non-derivative common stock only, with no accompanying option exercises or other derivative transactions listed in the filing’s transaction details or derivative summary.