Magnite's Haas Sullivan reports 72,913-share holding

The first scheduled RSU tranche is 4,792 units on November 15, 2026, with vesting conditioned on continued employment.

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) reports Chief Accounting Officer Haas Sullivan’s direct holding of 72,913 shares of common stock as of October 1, 2026. The reported amount includes 46,584 restricted stock units, which vest on scheduled dates through February 15, 2030, subject to continued employment.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Sullivan Haas

Role CHIEF ACCOUNTING OFFICER

Type	Security	Shares	Price	Value
holding	Common Stock F1	--	--	--

Holdings After Transaction: Common Stock — 72,913 shares (Direct)

Footnotes (1)

1. F1. Includes 46,584 restricted stock units that vest, subject to the Reporting Person's continued employment, as follows: 4,792 on November 15, 2026; 9,997 on February 15, 2027; 4,430 on May 15, 2027; 4,430 on August 15, 2027; 4,430 on November 15, 2027; 3,805 on February 15, 2028; 2,555 on May 15, 2028; 2,555 on August 15, 2028; 2,555 on November 15, 2028; 2,147 on February 15, 2029; 1,332 on May 15, 2029; 1,332 on August 15, 2029; 1,332 on November 15, 2029; and 892 on February 15, 2030.

Key Figures

Direct common-stock holding: 72,913 shares Restricted stock units: 46,584 units Scheduled RSU vesting: 4,792 units +2 more

5 metrics

Direct common-stock holding 72,913 shares As of October 1, 2026

Restricted stock units 46,584 units Included in the reported holding; vesting is subject to continued employment

Scheduled RSU vesting 4,792 units November 15, 2026

Scheduled RSU vesting 9,997 units February 15, 2027

Scheduled RSU vesting 4,430 units May 15, 2027

Key Terms

restricted stock units, vest

2 terms

restricted stock units financial

"Includes 46,584 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.

vest financial

"restricted stock units that vest, subject to continued employment"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

FAQ

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

How many MGNI shares did Chief Accounting Officer Haas Sullivan report?

Haas Sullivan reported a direct holding of 72,913 shares of Magnite common stock as of October 1, 2026. The reported amount includes 46,584 restricted stock units that vest subject to continued employment on scheduled dates through February 15, 2030.

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

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Available on EDGAR 10/02/2026 - 04:17 PM Accepted by SEC EDGAR 10/02/2026 - 04:16 PM Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Sullivan Haas

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 9TH FLOOR

(Street)

NEW YORK NEW YORK 10001

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2026

3. Issuer Name and Ticker or Trading Symbol
MAGNITE, INC. [ MGNI ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF ACCOUNTING OFFICER

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	72,913(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes 46,584 restricted stock units that vest, subject to the Reporting Person's continued employment, as follows: 4,792 on November 15, 2026; 9,997 on February 15, 2027; 4,430 on May 15, 2027; 4,430 on August 15, 2027; 4,430 on November 15, 2027; 3,805 on February 15, 2028; 2,555 on May 15, 2028; 2,555 on August 15, 2028; 2,555 on November 15, 2028; 2,147 on February 15, 2029; 1,332 on May 15, 2029; 1,332 on August 15, 2029; 1,332 on November 15, 2029; and 892 on February 15, 2030.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney

	/s/ Aaron Saltz, attorney-in-fact	10/02/2026
	** 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 5 (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 3: SEC 1473 (03-26)