Ouster CEO sells 30,385 shares for tax cover

Ouster’s CEO executed a Rule 10b5-1 tax-withholding sale of 30,385 shares and continues to hold over 1.04 million shares.

Rhea-AI Filing Summary

Ouster, Inc. (OUST) reported that President and CEO Charles Angus Pacala sold 30,385 shares of common stock on September 14, 2026 at a weighted average price of $33.9591 per share. The filing states these shares were sold to cover withholding taxes from vesting restricted stock units pursuant to a Rule 10b5-1 sale-to-cover instruction. Following this tax-related sale, Pacala directly holds 1,041,816 shares of Ouster common stock.

Insider Trade Summary 10b5-1

Net Seller: 30,385 shares

Net Sell 1 txn

Insider Pacala Charles Angus

Role President and CEO

Sold 30,385 shs ($1.03M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	30,385	$33.9591	$1.03M

Holdings After Transaction: Common Stock — 1,041,816 shares (Direct)

Footnotes (2)

1. F1. 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 June 9, 2025.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.705 to $33.9661. 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.

Key Figures

Shares sold: 30,385 shares Weighted average sale price: $33.9591 per share Post-transaction holdings: 1,041,816 shares +2 more

5 metrics

Shares sold 30,385 shares Common stock sale by CEO on September 14, 2026

Weighted average sale price $33.9591 per share Average price for 30,385 shares sold on September 14, 2026

Post-transaction holdings 1,041,816 shares CEO’s direct common stock holdings after the reported sale

Sale price range $33.705–$33.9661 per share Range of prices for multiple sale transactions on September 14, 2026

Shares sold for tax withholding 30,385 shares Shares sold to cover withholding taxes on vesting RSUs

Key Terms

Rule 10b5-1, withholding taxes, restricted stock units, weighted average price

4 terms

Rule 10b5-1 regulatory

"pursuant to a Rule 10b5-1 sale to cover instruction letter"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

withholding taxes financial

"shares sold to cover withholding taxes incurred upon the vesting"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

restricted stock units financial

"upon the vesting and settlement of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did OUST report for its CEO on September 14, 2026?

Ouster reported that CEO Charles Angus Pacala sold 30,385 shares of common stock on September 14, 2026 at a weighted average price of $33.9591 per share in multiple transactions within a disclosed price range.

Why did the OUST CEO sell 30,385 shares of Ouster, Inc. stock?

The filing states the 30,385 shares were sold to cover withholding taxes incurred upon the vesting and settlement of restricted stock units, under a Rule 10b5-1 sale to cover instruction dated June 9, 2025.

How many OUST shares does the CEO hold after this reported sale?

After the September 14, 2026 transaction, CEO Charles Angus Pacala directly holds 1,041,816 shares of Ouster, Inc. common stock, as reported in the Form 4 under total shares following the transaction.

What price range applied to the OUST CEO’s September 14, 2026 share sales?

The filing reports a weighted average sale price of $33.9591 per share and notes the shares were sold in multiple transactions at prices ranging from $33.705 to $33.9661 per share.

Was the OUST CEO’s stock sale made under a Rule 10b5-1 trading plan?

Yes. The document-level checkbox affirms Rule 10b5-1 status, and a footnote specifies the sale was made pursuant to a Rule 10b5-1 sale to cover instruction letter dated June 9, 2025.

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

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Available on EDGAR 09/16/2026 - 07:01 PM Accepted by SEC EDGAR 09/16/2026 - 07:01 PM Learn about SEC filing dates

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^*

Pacala Charles Angus

(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
X	Officer (give title below)		Other (specify below)
	President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

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	09/14/2026		S		30,385(1)	D	$33.9591(2)	1,041,816	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 June 9, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.705 to $33.9661. 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.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney

	/s/ Kenneth Gianella, as Attorney-in-Fact for Angus Pacala	09/16/2026
	** 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.
* Form 4: SEC 1474 (03-26)