Mark Frichtl reports multiple 10b5-1 sales and option exercise

Mark Frichtl reported multiple sales and an option exercise of Common Stock.

Rhea-AI Filing Summary

Mark Frichtl reported multiple sales and an option exercise of Common Stock. The filing lists numerous 10b5-1 sales between 03/12/2026 and 05/15/2026, and an Exercise of Stock Options for 50,063 shares dated 05/22/2026. The record also lists Founders Shares dated 09/03/2015 totaling 65,621 shares.

The transactions are reported as sales under an established plan and an option exercise; cash proceeds are shown for individual sale rows. The filing supplies trade dates, share counts, and dollar amounts for each listed sale.

Insights

Securities Compliance Analyst

Routine insider dispositions under a 10b5-1 plan and an option exercise are reported.

The filing lists multiple 10b5-1 sales with trade dates from 03/12/2026 through 05/15/2026, including large single-day sales (e.g., 136,434 shares on 05/13/2026) and an Exercise of Stock Options for 50,063 shares on 05/22/2026. The excerpt shows per-trade cash amounts tied to many rows ($4,442,371.08 style totals appear in the table).

These entries are compliance disclosures of transfers and an option exercise; the cash-flow treatment is shown per trade lines. Subsequent filings may provide consolidated totals or post-transaction holdings.

Key Figures

Option exercise: 50,063 shares Founders Shares: 65,621 shares Large single-day sale: 136,434 shares +3 more

6 metrics

Option exercise 50,063 shares Exercise of Stock Options dated 05/22/2026

Founders Shares 65,621 shares Founders Shares dated 09/03/2015

Large single-day sale 136,434 shares 10b5-1 sale on 05/13/2026

Example cash proceeds $4,442,371.08 Proceeds shown for a 05/13/2026 sale row

Another sale example 40,000 shares 10b5-1 sale on 05/14/2026 with proceeds $1,400,000.00

Small sale entry 400 shares 10b5-1 sale on 04/22/2026 with proceeds $12,000.00

Key Terms

10b5-1 sales, Exercise of Stock Options, Founders Shares, Rule 144

4 terms

10b5-1 sales regulatory

"10b5-1 Sales for MARK FRICHTL ... | Common | 05/15/2026 | 4316"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Exercise of Stock Options financial

"Common | 05/22/2026 | Exercise of Stock Options | Issuer | ... | 50063"

Founders Shares financial

"Common | 09/03/2015 | Founders Shares | Issuer | ... | 65621"

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.

Rule 144 regulatory

"Form type: 144 (file header context for this disclosure)"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

FAQ

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

What sales did Mark Frichtl report for OUST?

The filing lists multiple 10b5-1 sales between 03/12/2026 and 05/15/2026, including trades of 136,434, 60,000, and other share amounts with corresponding cash proceeds shown per trade lines.

Did the filing include any option exercises?

Yes. The filing records an Exercise of Stock Options for 50,063 shares dated 05/22/2026, described as an issuer transaction with cash consideration noted on the exercise line.

Are Founders Shares mentioned in the filing?

Yes. The record shows Founders Shares dated 09/03/2015 with a line item of 65,621 shares under the securities to be sold section of the filing.

Were dollar proceeds provided for the reported sales?

Yes. Individual sale lines include cash amounts for each trade (examples: $4,442,371.08 for one large sale entry and $1,400,000.00 for another), tied to the corresponding trade dates and share counts.

Does this filing indicate sales were made under a trading plan?

The sales are labeled as 10b5-1 Sales, indicating they were executed under pre-established trading arrangements; the filing lists each trade date, share count, and cash amount for those plan sales.

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

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Accepted by SEC EDGAR 05/22/2026 - 04:33 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	115684	4059351.56	63672949	05/22/2026	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	05/22/2026	Exercise of Stock Options	Issuer			50063	05/22/2026	Cash
Common	09/03/2015	Founders Shares	Issuer			65621	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	05/15/2026	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	05/22/2026
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)