Form 144: 10b5-1 sales reported for OUST holder

Morgan Stanley Smith Barney LLC Executive Financial Services submitted a Form 144 notice relating to proposed sales of Common stock by an issuer-affiliated holder under 10b5-1 plans.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services submitted a Form 144 notice relating to proposed sales of Common stock by an issuer-affiliated holder under 10b5-1 plans. The excerpt lists multiple dated sale entries, including specific transactions on 05/13/2026 and 05/22/2026, showing share quantities and gross proceeds.

Insights

Insider Transactions Analyst

Multiple scheduled 10b5-1 sales by an insider are disclosed with per-trade details.

The excerpt lists specific 10b5-1 sales with dates, share counts, and gross proceeds, for example a 136,434 share sale on 05/13/2026 for $4,442,371.08. These entries reflect executed or scheduled dispositions rather than new grants or issuances.

Cash-flow treatment and whether proceeds go to the issuer or selling holder are not specified in the excerpt; subsequent filings or broker confirmations would carry that detail.

Securities Compliance Counsel

Form 144 disclosures record proposed sales under Rule 144/10b5-1 mechanics, not company operational changes.

The filing lists multiple 10b5-1 sale transactions by the reporting holder with per-trade dollar amounts and dates, for example a 75,684 share sale on 05/22/2026 for $2,784,998.87. The document presents transaction detail required for regulatory notice.

Regulatory significance is procedural: the notice enables sales to proceed under applicable exemptions; the excerpt does not state whether any transfers closed or whether any seller limitations apply.

Key Figures

Sale on 05/13/2026: 136,434 shares Sale on 05/22/2026: 75,684 shares Sale on 05/15/2026: 4,316 shares +1 more

4 metrics

Sale on 05/13/2026 136,434 shares gross proceeds listed as $4,442,371.08

Sale on 05/22/2026 75,684 shares gross proceeds listed as $2,784,998.87

Sale on 05/15/2026 4,316 shares gross proceeds listed as $155,380.32

Sale on 05/14/2026 40,000 shares gross proceeds listed as $1,400,000.00

Key Terms

10b5-1, Founders Shares, Form 144

3 terms

10b5-1 regulatory

"10b5-1 Sales for MARK FRICHTL 350 Treat Avenue"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Founders Shares financial

"Common | 09/03/2015 | Founders Shares"

Founders shares are a special block of a company’s stock originally given to the people who started the business; they often carry extra voting power or favorable terms compared with regular shares. For investors, these shares matter because they concentrate control and influence how future funding, ownership dilution, and decision-making will play out—think of founders shares as the steering wheel that can steer a company’s direction even as more passengers (investors) climb aboard.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

FAQ

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

What does the OUST Form 144 disclose?

It discloses proposed sales of Common stock by a holder under 10b5-1 plans. The excerpt lists dated transactions with share counts and gross proceeds such as 136,434 shares for $4,442,371.08 on 05/13/2026.

Who appears to be selling in the OUST filing?

The notices reference sales executed under 10b5-1 arrangements by Mark Frichtl (address shown) or related holder entities. The entries list the seller name and per-trade quantities and proceeds in the excerpt.

Are the sale proceeds paid to OUST (the issuer)?

The excerpt does not state proceeds recipients. The listed lines show gross proceeds per trade but do not specify whether proceeds go to the issuer or selling holders in the provided text.

What are example transactions shown on the Form 144?

Examples include a 136,434-share sale on 05/13/2026 for $4,442,371.08 and a 75,684-share sale on 05/22/2026 for $2,784,998.87, both listed in the excerpt.

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

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Accepted by SEC EDGAR 05/26/2026 - 04:44 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001847596
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Ouster, Inc.
SEC File Number	001-39463
Address of Issuer	350 Treat Avenue San Francisco CALIFORNIA 94110
Phone	(415)949-0108
Name of Person for Whose Account the Securities are To Be Sold	MARK FRICHTL
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	268742	9951516.26	63672949	05/26/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/03/2015	Founders Shares	Issuer			268742	09/03/2015	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/22/2026	75684	2784998.87
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/15/2026	4316	155380.32
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/14/2026	40000	1400000.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/13/2026	136434	4442371.08
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/05/2026	13451	403530.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	05/04/2026	21149	637160.15
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/22/2026	400	12000.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/21/2026	60000	1713861.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/20/2026	60000	1594806.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/17/2026	30000	754395.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/15/2026	20000	480000.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	04/14/2026	40000	910248.00
10b5-1 Sales for MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	03/25/2026	40000	837576.00
MARK FRICHTL 350 Treat Avenue San Francisco CA 94110	Common	03/12/2026	15689	367637.20

144: Remarks and Signature

Remarks
Date of Notice	05/26/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/15/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Mark Frichtl
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)