Ouster, Inc. (OUST) COO sells 30,000 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

Ouster, Inc. Chief Operating Officer Spencer Darien sold 30,000 shares of common stock on August 4, 2026 at $45.00 per share in an open-market or private transaction. The sale was made under a Rule 10b5-1 plan dated November 18, 2025, leaving 299,806.5 shares held directly.

Insider Trade Summary 10b5-1

Net Seller: 30,000 shares

Net Sell 1 txn

Insider SPENCER DARIEN

Role Chief Operating Officer

Sold 30,000 shs ($1.35M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	30,000	$45.00	$1.35M

Holdings After Transaction: Common Stock — 299,806.5 shares (Direct)

Footnotes (1)

1. F1. Reflects shares sold pursuant to a Rule 10b5-1 plan dated November 18, 2025.

Key Figures

Shares sold: 30,000 shares Sale price: $45.00 per share Shares held after sale: 299,806.5 shares +1 more

4 metrics

Shares sold 30,000 shares Common stock sale on August 4, 2026 by COO Spencer Darien

Sale price $45.00 per share Per-share price for 30,000 common shares sold

Shares held after sale 299,806.5 shares Direct common stock holdings following the reported transaction

Net shares sold 30,000 shares Net sell volume across all transactions in this Form 4

Key Terms

Rule 10b5-1 plan, open market or private transaction, non-derivative

3 terms

Rule 10b5-1 plan regulatory

"Reflects shares sold pursuant to a Rule 10b5-1 plan dated November 18, 2025."

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

open market or private transaction financial

"Sale in open market or private transaction"

non-derivative financial

"transaction_type": "non-derivative""

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/05/2026 - 08:54 PM Accepted by SEC EDGAR 08/05/2026 - 08:53 PM Learn about SEC filing dates

FAQ

What insider transaction did OUST report for Chief Operating Officer Spencer Darien?

Ouster reported that Chief Operating Officer Spencer Darien sold 30,000 shares of common stock. The transaction occurred on August 4, 2026 and was reported as an open-market or private sale of non-derivative common stock.

At what price were the 30,000 OUST shares sold by the COO?

The 30,000 Ouster shares were sold at $45.00 per share. This per-share sale price is disclosed for the common stock transaction that took place on August 4, 2026, described as an open-market or private transaction.

How many OUST shares does Spencer Darien hold after the reported sale?

Following the sale, Spencer Darien holds 299,806.5 shares of Ouster common stock directly. This post-transaction holding reflects the position after disposing of 30,000 shares in the August 4, 2026 transaction.

Was the OUST COO’s 30,000-share sale made under a Rule 10b5-1 plan?

Yes. The filing states the shares were sold pursuant to a Rule 10b5-1 plan. A footnote specifies the trading plan was dated November 18, 2025, and the Form 4’s Rule 10b5-1 checkbox is affirmed.

What type of transaction code was used for the OUST COO’s sale?

The transaction is coded as S, described as a sale in an open market or private transaction. It is classified as a non-derivative transaction involving common stock, with 30,000 shares disposed at $45.00 per share.

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^*

SPENCER DARIEN

(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 Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/04/2026

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	08/04/2026		S		30,000(1)	D	$45	299,806.5	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 November 18, 2025.

	/s/ Megan Chung, as Attorney-in-Fact for Darien Spencer	08/05/2026
	** 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)