[Form 4] Ouster, Inc. Insider Trading Activity

Rhea-AI Filing Summary

SPENCER DARIEN reported acquisition or exercise transactions in this Form 4 filing.

Ouster, Inc.’s Chief Operating Officer Darien Spencer received an equity award of 46,125 restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of Ouster common stock at no purchase price.

The RSUs vest in equal quarterly installments, with 1/12 of the total units vesting on each quarterly anniversary of March 11, 2026, as long as Spencer remains in service through each vesting date. Following this grant, he holds 371,375 shares of common stock directly, including the shares underlying these RSUs. The RSUs have no expiration date and reflect compensation rather than an open-market stock purchase.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider SPENCER DARIEN

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	46,125	$0.00	--

Holdings After Transaction: Common Stock — 371,375 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).

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)
04/11/2026

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	04/11/2026		A		46,125(1)	A	$0	371,375	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. Represents Ouster, Inc. (the "Company") restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Company's common stock. The RSUs vest as to 1/12 of the total number of RSUs on each quarterly anniversary of March 11, 2026, the vesting commencement date, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

	/s/ Megan Chung, as Attorney-in-Fact for Darien Spencer	04/14/2026
	** 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) disclose about COO Darien Spencer’s new equity award?

Ouster disclosed that COO Darien Spencer received 46,125 restricted stock units (RSUs). Each RSU gives him the right to receive one share of common stock at no cost, subject to future vesting conditions and continued service.

How many Ouster (OUST) RSUs were granted to COO Darien Spencer?

Darien Spencer was granted 46,125 restricted stock units. These RSUs convert into the same number of Ouster common shares if they vest, making the grant a form of stock-based compensation aligned with the company’s long-term performance.

What is the vesting schedule for Darien Spencer’s Ouster (OUST) RSU grant?

The RSUs vest in 12 equal quarterly installments. Specifically, 1/12 of the 46,125 units vests on each quarterly anniversary of March 11, 2026, provided Spencer continues serving Ouster through each applicable vesting date.

Does Darien Spencer pay anything per share for his new Ouster (OUST) RSUs?

The reported price per share for the RSU grant is $0.00. This means the units are granted as compensation, and Spencer does not pay a purchase price when the RSUs convert into Ouster common shares upon vesting.

How many Ouster (OUST) shares does COO Darien Spencer hold after this RSU grant?

After the grant, Spencer’s direct holdings total 371,375 Ouster common shares. This figure includes the shares underlying the 46,125 restricted stock units reported in the filing, reflecting his overall equity stake shown in this transaction.

Do Darien Spencer’s Ouster (OUST) RSUs have an expiration date?

The RSUs reported in the filing have no expiration date. They remain outstanding until they either vest according to the quarterly schedule starting from March 11, 2026, or are otherwise forfeited based on Spencer’s service conditions.