MGNI Form 144: Insider sales of Common Stock reported

MGNI filing (Form 144): The filing lists proposed and recent sales of Common Stock tied to restricted stock vesting events under a registered plan and shows two reported sales by Adam L. Soroca.

Rhea-AI Filing Summary

MGNI filing (Form 144): The filing lists proposed and recent sales of Common Stock tied to restricted stock vesting events under a registered plan and shows two reported sales by Adam L. Soroca. The filing itemizes multiple vesting dates and share counts and records sales of 18,225 shares on 05/27/2026 and 18,451 shares on 05/18/2026, with dollar amounts shown alongside each sale.

Insights

Equity Compensation Analyst

Restricted stock vestings and subsequent sales reported for an insider.

The excerpt lists multiple restricted stock vesting events under a registered plan with specific vesting dates and share counts (for example, 10,921 shares vesting 05/15/2022). These entries document compensation-related issuances rather than new primary issuances to the market.

Two discrete open-market sales by Adam L. Soroca are recorded with share counts and gross proceeds shown. Cash‑flow treatment and whether sales were pursuant to a trading plan are not stated in the excerpt.

Securities Compliance Specialist

Form 144 notice of sale activity; procedural disclosure rather than strategic change.

The filing itemizes securities to be sold and securities sold in the past three months, consistent with disclosure obligations under resale rules. Specific sale dates (05/18/2026, 05/27/2026) and amounts (18,451 and 18,225 shares) are provided.

Timing, plan status, and buyer counterparty details are not included in the excerpt; subsequent filings would be required for fuller context on execution mechanics.

Key Figures

Sale by Adam L. Soroca (May 18, 2026): 18,451 shares Sale by Adam L. Soroca (May 27, 2026): 18,225 shares Vesting example: 10,921 shares +2 more

5 metrics

Sale by Adam L. Soroca (May 18, 2026) 18,451 shares sale date <date>05/18/2026</date>

Sale by Adam L. Soroca (May 27, 2026) 18,225 shares sale date <date>05/27/2026</date>

Vesting example 10,921 shares vesting date <date>05/15/2022</date>

Vesting example 4,774 shares vesting date <date>05/15/2023</date>

Vesting example 7,745 shares vesting date <date>01/09/2026</date>

Key Terms

Restricted stock vesting, Form 144, Registered plan

3 terms

Restricted stock vesting financial

"Restricted stock vesting under a registered plan"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

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.

Registered plan financial

"Restricted stock vesting under a registered plan"

A registered plan is a savings or investment account that a government recognizes for special tax treatment and rules, such as limits on how much you can put in and conditions for withdrawals. For investors it matters because those rules change how much of your gains are taxed, how quickly your money can be accessed and what strategies make sense — like a labeled jar that gives tax breaks but comes with rules about when and how you can take the money out.

FAQ

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

What does MGNI's Form 144 show about recent insider sales?

The Form 144 reports two recent sales by Adam L. Soroca: 18,451 shares on 05/18/2026 and 18,225 shares on 05/27/2026, with gross proceeds listed alongside each sale.

Are the shares tied to compensation or an offering in the MGNI excerpt?

Many line items list restricted stock vesting under a registered plan with specific vesting dates and share counts, indicating these shares originated from compensation-related vesting events.

Does the filing state who received the sale proceeds for the reported transactions?

The excerpt shows gross dollar amounts next to the reported sales but does not specify the recipient of proceeds or use of proceeds in the provided lines.

Which vesting events and share counts are listed in the filing excerpt?

The excerpt lists multiple vesting entries, for example: 10,921 shares vesting on 05/15/2022, 4,774 shares vesting on 05/15/2023, and others shown with their vesting dates.

Does the Form 144 excerpt indicate whether sales were part of a trading plan?

The provided content does not state whether the reported sales were executed pursuant to a Rule 10b5-1 trading plan or any pre-arranged sale program.

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

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Accepted by SEC EDGAR 05/28/2026 - 04:21 PM EDT 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	0001725125
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	MAGNITE, INC.
SEC File Number	001-36384
Address of Issuer	1250 Broadway, 9th Floor New York NEW YORK 10001
Phone	(212) 243-2769
Name of Person for Whose Account the Securities are To Be Sold	ADAM L SOROCA
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	Former 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	42756	603084.95	143215003	05/28/2026	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	01/09/2026	Restricted stock vesting under a registered plan	Issuer			7745	01/09/2026	Services Rendered
Common	05/15/2022	Restricted stock vesting under a registered plan	Issuer			10921	05/15/2022	Services Rendered
Common	05/15/2022	Restricted stock vesting under a registered plan	Issuer			3928	05/15/2022	Services Rendered
Common	05/15/2023	Restricted stock vesting under a registered plan	Issuer			4774	05/15/2023	Services Rendered
Common	02/15/2023	Restricted stock vesting under a registered plan	Issuer			3042	02/15/2023	Services Rendered
Common	11/15/2022	Restricted stock vesting under a registered plan	Issuer			10921	11/15/2022	Services Rendered
Common	01/15/2020	Restricted stock vesting under a registered plan	Issuer			1425	01/15/2020	Services Rendered

* 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
ADAM L SOROCA 1250 Broadway, 9th Floor New York NY 10001	Common	05/27/2026	18225	250477.11
ADAM L SOROCA 1250 Broadway, 9th Floor New York NY 10001	Common	05/18/2026	18451	247975.90

144: Remarks and Signature

Remarks
Date of Notice	05/28/2026
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/ Adam Lee Soroca
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)