Ouster (NYSE: OUST) CFO offloads 40,000 shares via 10b5-1 plan

Rhea-AI Filing Summary

Ouster, Inc. (OUST) reported that Chief Financial Officer Kenneth P. Gianella sold a total of 40,000 shares of common stock on August 18, 2026 in four open-market transactions at weighted average prices between $44.65 and $47.09. The sales were executed pursuant to a Rule 10b5-1 plan dated May 19, 2026, and each reported price reflects a weighted average of multiple trades within disclosed intraday price ranges. Post-transaction share holdings are not reported in this filing.

Insider Trade Summary 10b5-1

Net Seller: 40,000 shares

Net Sell 4 txns

Insider Gianella Kenneth P.

Role Chief Financial Officer

Sold 40,000 shs ($1.81M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	17,927	$44.6487	$800K
Sale	Common Stock F1, F3	13,364	$45.5243	$608K
Sale	Common Stock F1, F4	8,201	$46.4035	$381K
Sale	Common Stock F1, F5	508	$47.0851	$24K

Holdings After Transaction: Common Stock — 261,014 shares (Direct)

Footnotes (5)

1. F1. Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.00 to $44.94. 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.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.01 to $45.865. 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.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.00 to $46.99. 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.
5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.05 to $47.115. 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 (block 1): 17,927 shares at $44.6487 per share Shares sold (block 2): 13,364 shares at $45.5243 per share Shares sold (block 3): 8,201 shares at $46.4035 per share +3 more

6 metrics

Shares sold (block 1) 17,927 shares at $44.6487 per share Open-market sale of Ouster common stock on August 18, 2026

Shares sold (block 2) 13,364 shares at $45.5243 per share Open-market sale of Ouster common stock on August 18, 2026

Shares sold (block 3) 8,201 shares at $46.4035 per share Open-market sale of Ouster common stock on August 18, 2026

Shares sold (block 4) 508 shares at $47.0851 per share Open-market sale of Ouster common stock on August 18, 2026

Total shares sold 40,000 shares Aggregate non-derivative sales by CFO Kenneth P. Gianella on August 18, 2026

10b5-1 plan date May 19, 2026 Date of Rule 10b5-1 trading plan governing the reported sales

Key Terms

Rule 10b5-1 plan, weighted average price, open market or private transaction

3 terms

Rule 10b5-1 plan regulatory

"Reflects shares sold pursuant to a Rule 10b5-1 plan dated May 19, 2026."

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.

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.

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

What insider transaction did OUST disclose for CFO Kenneth P. Gianella?

Ouster disclosed that CFO Kenneth P. Gianella sold 40,000 shares of common stock on August 18, 2026. The sales occurred in four open-market transactions at weighted average prices between $44.65 and $47.09, executed under a pre-arranged Rule 10b5-1 trading plan.

At what prices were the OUST shares sold in this Form 4 filing?

The reported weighted average sale prices were $44.6487, $45.5243, $46.4035, and $47.0851 per share. Each price represents a weighted average of multiple trades within specified ranges from $44.00 up to $47.115 per share.

Was the OUST CFO’s sale conducted under a Rule 10b5-1 trading plan?

Yes. The filing states the 40,000-share sale was made pursuant to a Rule 10b5-1 plan dated May 19, 2026. This indicates the transactions were pre-arranged, which can reduce the informational value of their timing for investors.

How many OUST shares did the CFO sell in each transaction?

Kenneth P. Gianella sold 17,927 shares, 13,364 shares, 8,201 shares, and 508 shares of Ouster common stock. All four transactions occurred on August 18, 2026 and are reported as open-market or private sales of non-derivative common stock.

Does the Form 4 disclose the CFO’s OUST holdings after these sales?

No. The reported transactions list the shares sold and sale prices, but total shares following the transactions are not provided. Investors cannot determine the CFO’s remaining direct ownership from this specific Form 4 alone.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/19/2026 - 08:32 PM Accepted by SEC EDGAR 08/19/2026 - 08:32 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^*

Gianella Kenneth P.

(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 Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2026

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	08/18/2026		S		17,927(1)	D	$44.6487(2)	283,087	D
Common Stock	08/18/2026		S		13,364(1)	D	$45.5243(3)	269,723	D
Common Stock	08/18/2026		S		8,201(1)	D	$46.4035(4)	261,522	D
Common Stock	08/18/2026		S		508(1)	D	$47.0851(5)	261,014	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 May 19, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.00 to $44.94. 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.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.01 to $45.865. 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.00 to $46.99. 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.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.05 to $47.115. 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, as Attorney-in-Fact for Kenneth P. Gianella	08/19/2026
	** 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)