Magnite (MGNI) director sells 48,986 shares under 10b5-1 plan

Rhea-AI Filing Summary

MAGNITE, INC. (MGNI) director Sarah Patricia Harden reported two open-market sales of common stock under a Rule 10b5-1 trading plan adopted on May 27, 2026. She sold 18,436 shares on August 28, 2026 at $24.00 per share and 30,550 shares on August 26, 2026 at a weighted average price of $23.31 per share, with the latter sale executed in multiple trades at prices ranging from $23.09 to $23.52 per share.

Insider Trade Summary 10b5-1

Net Seller: 48,986 shares

Net Sell 2 txns

Insider Harden Sarah Patricia

Role Director

Sold 48,986 shs ($1.15M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	18,436	$24.00	$442K
Sale	Common Stock F1, F2	30,550	$23.31	$712K

Holdings After Transaction: Common Stock — 114,751 shares (Direct)

Footnotes (2)

1. F1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 27, 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 $23.09 to $23.52, inclusive. The Reporting Person undertakes to provide to 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 to this Form 4.

Key Figures

Shares sold on 2026-08-28: 18,436 shares of Common Stock Shares sold on 2026-08-26: 30,550 shares of Common Stock Total shares sold: 48,986 shares of Common Stock +3 more

6 metrics

Shares sold on 2026-08-28 18,436 shares of Common Stock Open-market sale by director at $24.00 per share

Shares sold on 2026-08-26 30,550 shares of Common Stock Open-market sale by director at weighted average $23.31 per share

Total shares sold 48,986 shares of Common Stock Sum of reported sales in this Form 4

Price per share on 2026-08-28 $24.00 per share Single-price sale of 18,436 shares

Weighted average price on 2026-08-26 $23.31 per share Multiple trades between $23.09 and $23.52 per share

Price range on 2026-08-26 $23.09–$23.52 per share Range of prices for the 30,550-share sale

Key Terms

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

3 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

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 transactions did MGNI director Sarah Patricia Harden report?

She reported two open-market sales of MAGNITE, INC. common stock, totaling 48,986 shares, executed on August 26 and 28, 2026, at prices around the mid–$20 range.

How many MGNI shares did Sarah Patricia Harden sell on August 28, 2026?

On August 28, 2026, Sarah Patricia Harden sold 18,436 shares of MAGNITE, INC. common stock at a price of $24.00 per share in an open-market transaction.

What were the details of Sarah Patricia Harden’s August 26, 2026 sale of MGNI stock?

On August 26, 2026, she sold 30,550 shares of MAGNITE, INC. common stock at a weighted average price of $23.31 per share, in multiple trades priced between $23.09 and $23.52 per share.

Were Sarah Patricia Harden’s MGNI stock sales under a Rule 10b5-1 plan?

Yes. The filing states the reported transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by Sarah Patricia Harden on May 27, 2026.

How many MGNI shares did Sarah Patricia Harden sell in total in this Form 4?

In this Form 4, Sarah Patricia Harden reported total sales of 48,986 shares of MAGNITE, INC. common stock across the two reported transactions.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/28/2026 - 06:36 PM Accepted by SEC EDGAR 08/28/2026 - 06:36 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^*

Harden Sarah Patricia

(Last) (First) (Middle)

C/O MAGNITE, INC.

1250 BROADWAY, 9TH FLOOR

(Street)

NEW YORK NEW YORK 10001

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026

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	08/26/2026		S(1)		30,550	D	$23.31(2)	133,187	D
Common Stock	08/28/2026		S(1)		18,436	D	$24	114,751	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. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 27, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.09 to $23.52, inclusive. The Reporting Person undertakes to provide to 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 to this Form 4.

Remarks:

	/s/ Aaron Saltz, attorney-in-fact	08/28/2026
	** 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)